GS1-2-3-4 Goodwin Sands - United Kingdom Hydrographic Office

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GS1-2-3-4 Goodwin Sands - United Kingdom Hydrographic Office

THE UNITED KINGDOM

HYDROGRAPHIC OFFICE

GOODWIN SANDS

ASSESSMENT ON THE ANALYSIS OF ROUTINE RESURVEY AREAS

GS1, GS2, GS3 & GS4

FROM THE 2009 SURVEY

July 2010


THE UNITED KINGDOM

HYDROGRAPHIC OFFICE

GOODWIN SANDS

AREAS GS1, GS2, GS3 & GS4

Assessment GS1-4/2009

An assessment of the 2009 hydrographic survey of the area: to monitor recent seabed

movement; to identify any implications for shipping; and to make recommendations for

future surveys.

The Admiralty Chart extracts, other graphics and tables in this Report are included for illustrative purposes only and are NOT

TO BE USED FOR NAVIGATION.

This material is protected by Crown Copyright. It may be downloaded from the UK Hydrographic Office's (UKHO) web site

and printed in full for personal or non-commercial internal business use. Extracts may also be reproduced for personal or

non-commercial internal business use on the condition that the UK Hydrographic Office is acknowledged as the publisher and

the Crown is acknowledged as the copyright owner.

Applications for permission to reproduce the material for any other purpose (including any distribution of the material or

extracts to third parties) can be made interactively on the UKHO's web site (www.ukho.gov.uk), by e-mail to

intellectualproperty@ukho.gov.uk or in writing to Intellectual Property, UK Hydrographic Office, Admiralty Way, Taunton,

Somerset, TA1 2DN.

Assessment Goodwin Sands/2009 – Original Page 1 of 51


CONTENTS

1. EXECUTIVE SUMMARY 5

2. INTRODUCTION 6

3. HISTORY 6

4. DESCRIPTION OF THE AREA 7

5. SHIPPING IN THE AREA 7

6. 1997 SURVEY DETAILS 7

7. 2003 SURVEY DETAILS 7

8. 2006 SURVEY DETAILS 8

9. 2009 SURVEY DETAILS 8

10. DESCRIPTION OF RECENT BATHYMETRIC CHANGE 9

11. IMPLICATIONS FOR SHIPPING 13

12. RECOMMENDATIONS FOR FUTURE SURVEYS 13

13. REFERENCES 17

Assessment Goodwin Sands/2009 – Original Page 2 of 51


Survey History

ANNEXES

A-1 Area Specifications (Including Survey History) Area GS1 18

A-2 Area Specifications (Including Survey History) Area GS2 19

A-3 Area Specifications (Including Survey History) Area GS3 20

A-4 Area Specifications (Including Survey History) Area GS4 21

General Diagrams

B Goodwin Sands Resurvey Scheme 22

C Sun-Illuminated View of the 2009 Survey Showing Bank and Channel Migration 23

D Shipping Routes 24

E Sun-Illuminated View of the 2009 Survey and Location of Cross-Sections shown 25

at Annex F

F Survey Cross-Sections 26

Whole Area Depth, Variability & Contour Plots

G-1 Colour Banded Depth Plot from the 1997 Survey showing Selected Depths 28

G-2 Colour Banded Depth Plot from the 2009 Survey showing Selected Depths 29

H Variability Plot showing Bathymetric Changes between the 1997 and 2009 Survey 30

Data and Charted Contours from the 2009 Survey

I-1 Composite Diagram of the 2 metre Contour from the 1997 & 2009 31

I-2 Composite Diagram of the 5 metre Contour from the 1997 & 2009 32

I-3 Composite Diagram of the 10 metre Contour from the 1997 & 2009 33

I-4 Composite Diagram of the 15 metre Contour from the 1997 & 2009 34

GS1 Area Depth, Variability & Contour Plots

J-1 Colour Banded Depth Plot from the 2006 Survey showing Selected Depths Area GS1 35

J-2 Colour Banded Depth Plot from the 2009 Survey showing Selected Depths Area GS1 36

K Variability Plot showing Bathymetric Changes between the 2006 and 2009 Survey 37

Data and Charted Contours from the 2009 Survey Area GS1

L-1 Composite Diagram of the 5 metre Contour from the 2006 & 2009 Area GS1 38

L-2 Composite Diagram of the 10 metre Contour from the 2006 & 2009 Area GS1 39

L-3 Composite Diagram of the 15 metre Contour from the 2006 & 2009 Area GS1 40

GS2 Area Depth, Variability & Contour Plots

M-1 Colour Banded Depth Plot from the 2003 Survey showing Selected Depths Area GS2 41

M-2 Colour Banded Depth Plot from the 2009 Survey showing Selected Depths Area GS2 42

N Variability Plot showing Bathymetric Changes between the 2006 and 2009 Survey 43

Data and Charted Contours from the 2009 Survey Area GS2

O-1 Composite Diagram of the 5 metre Contour from the 2003 & 2009 Area GS2 44

Assessment Goodwin Sands/2009 – Original Page 3 of 51


O-2 Composite Diagram of the 10 metre Contour from the 2003 & 2009 Area GS2 45

GS3 Area Depth, Variability & Contour Plots

P-1 Colour Banded Depth Plot from the 2003 Survey showing Selected Depths Area GS3 46

P-2 Colour Banded Depth Plot from the 2009 Survey showing Selected Depths Area GS3 47

Q Variability Plot showing Bathymetric Changes between the 2006 and 2009 Survey 48

Data and Charted Contours from the 2009 Survey Area GS3

R-1 Composite Diagram of the 5 metre Contour from the 2003 & 2009 Area GS3 49

R-2 Composite Diagram of the 10 metre Contour from the 2003 & 2009 Area GS3 50

Proposed Limits

S Proposed Revised Limits 51

Assessment Goodwin Sands/2009 – Original Page 4 of 51


GOODWIN SANDS, 2009

1. EXECUTIVE SUMMARY

The Area and Recent Changes

1.1 The 2009 survey was a complete re-survey of the Goodwin Sands. The area is covered

by four routine resurvey areas with re-survey frequencies of 3, 6 and 12 years.

1.2 Shipping generally avoids the shoal and changing banks of the Goodwin Sands,

keeping offshore to the south and east or using the inshore route of Gull Stream to the

west. Ferry traffic en-route to or from Ramsgate crosses the northern end of the

Goodwin Sands.

1.3 GS1 (South Sand Head): The southern end of the bank system has seen a new limb

develop, resulting in a realignment of the contours.

1.4 GS2 (Gull Stream): The inshore buoyed route is relatively stable and devoid of

significant sediments within the central part and along the western side, but with

sandwaves at the north and south entrances, which have produced shallower depths in

the 2009 survey. The survey as a whole is notably shallower than the previous survey,

which is likely to be the result of different tidal reduction methods. Along the eastern

side of Gull Stream, sinuous broken shoal areas have been reworked, with a bulge

extending into the channel between North West Goodwin and North Goodwin buoys.

1.5 GS3 (North Head of South Calliper): The bank has migrated eastwards by

approximately 70 metres and extended north-eastwards by 200 metres since the 2003

survey.

1.6 GS4 (Goodwin Sands Inner Area): The most dramatic changes to the bank complex

have occurred in this area, in particular to South Calliper. Depths have increased by

over 20 metres on the eastern side, exposing several large wrecks, while on the

western side over 20 metres of sediment has built up, with the bank encroaching into

Trinity Bay by up to 1,000 metres. Within the bank system itself, the banks and

channels have generally moved in a southeast direction since last surveyed.

1.7 Due to the large scale changes that have occurred, an urgent New Edition of chart

1828 is being produced in lieu of Notice to Mariner action. In advance of the New

Edition, Trinity House marked the limit of the bank in Trinity bay with a temporary west

cardinal buoy.

Reasons for Continuing to Resurvey the Area

1.8 The Goodwin Sands are generally avoided by shipping, but there is an ongoing

requirement for re-surveying:

• Gull Stream, although a relatively stable channel, borders the northwest side of

the bank system and the limits of the bank require re-surveying to capture

changes;

• The south and west extents of the bank are buoyed and resurveying of these

outer limits is required;

• The northern end of the bank is crossed by Ramsgate ferry traffic and changes

in depth require monitoring;

Assessment Goodwin Sands/2009 – Original Page 5 of 51


• The full bank system requires re-surveying on a less frequent basis to ensure

the chart gives a depiction of the banks and channels which bears some

resemblance to their likely configuration, although the highly changeable nature

of the banks and limited use of the area supports less frequent surveying.

Recommendations

1.9 The changes that have occurred necessitate a revision to the area limits, with the

introduction of more frequent surveying in the form of check surveys in some areas.

The proposed new scheme is shown at Annex S.

1.10 GS1 (South Sand Head): The 3-year resurvey frequency should be retained, but with

the limits revised.

1.11 GS2 (Gull Stream): The 3-year focused survey should be retained, with minor changes

to the limits.

The full 6-year survey should be retained, although a second multibeam survey may

support a reduction in limits or decrease in frequency.

North Sand head shows some shoaling and, given the density of ferry traffic, a 3-year

focused survey should be introduced to cover the area.

1.12 GS3 (North Head of South Calliper): The 3-year resurvey frequency should be retained,

but with the limits reduced.

1.13 GS4 (Goodwin Sands Inner Area): The 12-year resurvey frequency should be retained,

but with the introduction of a 3-year checkline survey to cover South Calliper and a 6-

year checkline survey to cover the eastern side of Goodwin Knoll.

2. INTRODUCTION

2.1 This Assessment is produced by the United Kingdom Hydrographic Office (UKHO), on

behalf of the Ministry of Defence (MOD), for the Maritime and Coastguard Agency

(MCA), on behalf of the Department for Transport (DfT).

2.2 The Assessment is funded as part of the Civil Hydrography Programme (CHP) and is

governed by a Memorandum of Understanding between the DfT (including the MCA)

and the MOD (including the UKHO).

3. HISTORY

3.1 The Goodwin Sands have been surveyed numerous times, going right back to 1795.

They were last surveyed as a complete area in 1997 (with a small area initially covered

by checklines resurveyed in 1998).

3.2 The four re-survey areas cover 37 square Nautical Miles. These are broadly similar to

those in place at the time of the 1997 survey, but analysis of that survey resulted in

the following two changes. Three areas covering the Gull Stream were merged into a

single area (this has subsequently been revised further to include a focused area). The

survey frequency of the largest area, covering the inner banks, was extended from 6 to

12 years.

3.3 Details of the areas including the survey history are at Annexes A-1 to A-4. The limits

of the areas are shown at Annex B.

Assessment Goodwin Sands/2009 – Original Page 6 of 51


3.4 The history and long term evolution of the bank system was reported on in detail by

R.L. Cloet in 1954.

4. DESCRIPTION OF THE AREA

4.1 Goodwin Sands comprises of a complex and dynamic system of banks incised by

relatively deep ebb and flood channels. Sandwaves overlie the banks, with notable

sandwave fields at the northern ends of them. The general form of the bank is shown

in Annex C.

4.2 The Gull Stream to the west is less dynamic, with thinly covered or exposed shoal

ledges and ridges within the channel but sandwaves present at both ends.

5. SHIPPING IN THE AREA

5.1 The shoal and changing banks of the Goodwin Sands are generally avoided by shipping.

Most pass well to the east but, where draught permits, some choose to use the inshore

buoyed route of Gull Stream. Sample data shows vessels up to 7.3 metres using the

route, and an estimated annual usage of about 900 vessels. While most vessels keep

to the buoyed channel, in the north some leave the channel when not constrained by

draught, as shown in Annex D.

5.2 Ramsgate to Ostend ferry traffic, drawing up to 5.3 metres, passes across the northern

part of North Sand head. A Ramsgate to Boulogne high speed ferry service is being

introduced, with four crossings a day passing through the Gull Stream or, depending

upon weather conditions and state of the tide, east of the Goodwin Sands. Trinity Bay

and The Downs, lying between the Goodwin Sands and Kent coast, provides a waiting

area for ferry traffic in the event of the Port of Dover being closed and sheltered

anchorage for large draught vessels.

6. 1997 SURVEY DETAILS

6.1 A survey of all areas was conducted from 19 May to 24 June. Prior to surveying, sea

conditions were moderate with south-westerly winds, however, during the surveying

period sea states and wind directions varied considerable.

6.2 Sounding lines were run at 62.5 metre intervals in the direction of 031°/211°.

Positioning was by DGPS and the survey referred to OS(SN)80 Datum, meeting the

requirement for a horizontal accuracy of better than 13 metres (2 sigma). The

assessed accuracy of depth measurements was +/-0.36 metres (2 sigma). The survey

data was processed at a scale of 1:25,000.

7. 2003 SURVEY DETAILS

7.1 The survey of areas GS2 and GS3 was conducted from 22 April to 11 May. Prior to

surveying, a deep depression transited the United Kingdom with winds up to 30 knots,

the strongest of which came from the west and southwest.

7.2 Sounding lines were run at 62.5 metre intervals, in the direction of 037°/217° in area

GS2 and 032°/212° in area GS3. Positioning was by DGPS and the survey referred to

the current equivalent of the World Geodetic System 1984 (WGS 84) Datum for

Europe, the European Terrestrial Reference System (ETRS 89) Datum. The survey

meets the requirement for a horizontal accuracy of better than ±5 metres (2 sigma).

Assessment Goodwin Sands/2009 – Original Page 7 of 51


7.3 The assessed accuracy of depth measurements was +/-0.38 metres (2 sigma) and met

the required standard. The survey data was processed at a scale of 1:25,000.

8. 2006 SURVEY DETAILS

8.1 The survey of areas GS1 and GS2 (focused) was conducted from 2 to 10 September.

Weather in the area was initially poor and on 6 September deteriorated, with the vessel

breaking off surveying. The weather had improved enough by 10 September to

complete the survey.

8.2 Survey data was acquired using a Kongsberg 3002D multibeam echosounder system.

8.3 The Primary Reference Position was provided by Applanix POS MV systems, supplied

with GPS data from a Real Time Kinematic (RTK) system, using GPS carrier phase

measurements observed at an installed Geodetic Control Station in Margate. The

survey met the accuracy requirements for an IHO Order 1 survey.

8.4 The shallowest part of GS1, with depths of less than 5 metres, was surveyed at the end

of the survey period, following a 4 day break in operations. Where these lines overlap

with those run 5 days earlier, there is a significant change in the shape of the bank.

The profile below shows the extent of change that occurred between 5 and 10

September, with over 2 metres of sediment accumulating and a steep southern slope

forming (Figure 5.1).

2 m

80 m

South

Figure 5.1: Survey line cross-sections (Blue 5 Sept, Red 10 Sept)

North

8.5 Examination of WaveNet data for Hastings and West Gabbard shows increased

significant wave heights during the period, with wave heights exceeding 2 metres at

both sites. Over the course of a year, these wave heights are not exceptional and it is

likely that over the shallowest part of the bank sediments are regularly reworked with

changes in wave energy, direction and tidal factors.

9. 2009 SURVEY DETAILS

9.1 The four Goodwin Sands areas were surveyed from 23 July to 1 September, in

conjunction with four Dover Strait areas. Weather in the area was generally good

throughout the survey period, with slight to smooth sea states. Survey work was

undertaken by two vessels, surveying in the Goodwin Sands areas for 16 and 25 days

each.

9.2 South Calliper had extended outside the established survey limits (with the 10 metre

contour migrating up to 1,000 metres), although the survey work was not adjusted at

Assessment Goodwin Sands/2009 – Original Page 8 of 51


the time to cover this. Because of this, the surveyor was requested to run additional

lines to delimit the bank, which were run in March 2010.

9.3 The survey was conducted using dual head Kongsberg Maritime EM3002D multibeam

echosounders. The survey achieved IHO S44 Order 1a standard and obtained 100%

seafloor cover up to the 2 metre contour. This has left three large area of shallower

water unsurveyed.

9.4 Positioning was by Applanix POS/MV, combining GPS and inertial Measurement Unit

data to produce the navigation solution. The survey is referred to the ITRF2000

Datum.

9.5 Depths were reduced to Chart Datum using GPS heights, with ellipsoidal height to chart

datum separation values taken from the Vertical Offshore Reference Framework

(VORF).

9.6 The survey overlaid on chart 1828 is shown at Annex E.

10. DESCRIPTION OF RECENT BATHYMETRIC CHANGE

10.1 Colour banded depth plots of the 1997 and 2009 surveys are at Annexes G-1 and G-2.

A variability plot showing the depth differences between the 1997 and 2009 surveys is

at Annex H. The variability plot shows the large changes to the banks since the area

was last fully surveyed.

10.2 Comparison plots of the 2, 5, 10 and 15 metre contours from the 1997 and 2009

surveys are at Annexes I-1 to I-4.

10.3 Colour banded depth plots, variability plots and contour comparisons are at Annexes J

to R for areas GS1, GS2 and GS3, to examine the changes since the previous survey of

those areas.

GS1 South Sand Head

10.4 Colour banded depth plots of the 2006 and 2009 surveys are at Annexes J-1 and J-2.

A variability plot showing the depth differences between the 2006 and 2009 surveys is

at Annex K.

10.5 Comparison plots of the 5, 10 and 15 metre contours from the 2006 and 2009 surveys

are at Annexes L-1, L-2 and L-3.

10.6 Changes that have occurred to South Sand Head are broadly similar to those observed

in the previous assessment of the area, when the 2003 and 2006 surveys were

examined.

10.7 In the north of the area, the bank has migrated north-westwards, with the greatest

change occurring over the top of the bank, as shown in cross-section A-B at Annex F.

10.8 At the southern end, a new limb is forming to the east of a previous one. The result of

this is that, along the new limb, the 10 metre contour has extended 340 metres southwestwards

since 2006 (as shown in Annex L-2). The longer term changes over the last

12 years are shown in figure 10.1.

Assessment Goodwin Sands/2009 – Original Page 9 of 51


10

10

20

20

Figure 10.1: 10 & 20 metre contours and limb axis 1997 (Blue) diminishing and 2009 (Red)

developing

10.9 Depths at South West Goodwin buoy have shoaled by 2 metres and the buoy, which

has been moved 1,100 metres north-eastwards since the 2006 survey, now sits on the

20 metre contour. Depths in this area will shoal further if the new limb continues to

extend.

10.10 The greatest change that has occurred to the southern part of South Calliper is in area

GS4 to the north of South Sand Head. In GS4, there has been extensive movement of

sediment since last surveyed 12 years ago, with depths of over 20 metres in an area

that was previously drying. These changes could have a significant influence on the

long-term development of South Sand Head.

GS2 Gull Stream

10.11 Within Gull Stream itself, the same megaripples are present in both the 2006 and 2009

surveys, highlighting the general stability and absence of short term change.

10.12 There is a noticeable depth offset between the 2006 focused survey and the 2009

multibeam survey, with the new survey being shallower. In sample cross-sections, the

difference is 0.30 metres in the north of the 2006 survey, increasing to 0.57 metres in

the south (see figure 10.2). The surface difference between the 2003 singlebeam and

2009 survey also suggests a shoal offset in the 2009 survey. This is likely to be due to

the difference in tidal reduction methods and this offset needs taking into account

when comparing these surveys.

Assessment Goodwin Sands/2009 – Original Page 10 of 51


Depth Difference over Stable Area 2006 & 2009

(Mean Difference 0.57 Metres)

Depth (m)

-10.5

-11

-11.5

-12

-12.5

-13

-13.5

-14

-14.5

2006

2009

0 250 500

Distance (m)

Figure 10.2: Depth offset between the 2006 and 2009 surveys (southern area)

10.13 At the southern entrance to the channel, sandwaves have migrated northwards by up

to 100 metres since 2006. The controlling depth within the buoyed entrance in the

2009 survey is 5 4 , which lies close to Goodwin Fork buoy. This is notably shallower

than a controlling depth of 6 7 lying to the southwest in the 2003 survey.

10.14 At the northern entrance to the channel, sandwaves have generally migrated northeastwards

slightly since 2003. However, some of the features lying across the channel

are in broadly similar positions to 50 years ago, appearing well established and subject

to little change, although a new minimum depth of 8 2 was found in the channel in the

2009 survey. The northern extent of North Head Sand remains in a broadly similar

position to 30 years ago, but the 5 metre contour has expanded since last surveyed.

10.15 Along the eastern side of the channel, the bank can be considered as having two

distinct characteristics. In the north of the area, North Sand Head appears well defined

and relatively stable, but with expansion occurring over the last 12 years, as shown by

the 5 and 10 metre contours at Annexes I-2 and O-2. To the south of this, extending

in a south-westerly direction from Goodwin Knoll, there are several sinuous broken

shoal areas. These areas are subject to large change, as the sediments are reworked

and indentations in the bank form or infill. Much of this change is occurring within the

overall bank limits and there is no strong evidence of a general migration into Gull

Stream. However, between North West Goodwin and North Goodwin buoys, a bulge in

the bank extends further out into Gull Stream than in the 1997, 2003 and 2006

surveys (see Annexes I-2 and O-1).

10.16 The eastern side of the sinuous shoal areas has generally deepened since surveyed in

1997, resulting in the exposure of a 125 metre long wreck previously charted as a foul

area. This highlights the potential for large features to become exposed by shifting

sediments as shown in figure 10.3.

Assessment Goodwin Sands/2009 – Original Page 11 of 51


Figure 10.3: Large wreck exposed since 1997 survey

GS3 North Head of South Calliper

10.17 The bank has migrated eastwards by approximately 70 metres and extended northeastwards

by 200 metres since the 2003 survey. This continues the trend seen

between the 1997 and 2003 surveys. The greatest change is to the upper part of the

bank, resulting in an increase in gradient on the eastern side, as shown in profile G-H

at Annex F.

GS4 Goodwin Sands Inner Area

10.18 The greatest change that has occurred within GS4 has been to South Calliper, where

there has been a significant westward migration of the bank and reworking of

sediments. On the eastern side, large amounts of sediment have been removed,

exposing several large wrecks. In the area of greatest change, depths in excess of 20

metres now exist where areas of drying bank were present in the 1997 survey. On the

western side, the bank has encroached into Trinity Bay by up to 1,000 metres (average

83m/yr), resulting in drying depths in an area where depths of more than 20 metres

were found previously. These changes are best seen in the 5 and 10 metre contours at

Annexes I-2 and I-3. They indicate that the once homogenous area of bank between

North Head of South Calliper and South Sand Head may be reforming into a main

northern area and separate southern area.

10.19 Within the central part of the bank system, the banks and ebb channels have generally

migrated south-eastwards by around 600 metres. Goodwin Knoll has also extended

eastwards to the south of North Sand Head, with the 10 metre contour extending

eastwards by up to 350 metres. Shallower water and extending of the bank was

reported by the Ramsgate lifeboat in 2008. The ridge at the southern end of Kellet Gut

has retreated 600 metres.

Goodwin Sands Long-Term Changes

10.20 Analysis of the Goodwin Sands and the Brake Bank by R. L. Cloet (1954) considered

the Goodwin Sands system to have an aerofoil shape. The orientation of the system

from a 1795 survey onwards was examined and showed a trend in rotation towards a

north-south alignment, but with an indication of slowing down in the rate of change.

Assessment Goodwin Sands/2009 – Original Page 12 of 51


10.21 Updating the figures for the 2009 survey shows that, as a whole, the bank system has

continued the trend towards a more north-south alignment. However, much of this

appears to be due to the eastward migration of South Sand Head and, within the bank

system itself, there is evidence of a clockwise rotation away from a north-south

alignment.

Goodwin Sands Major Axis Orientation

30

Orientation (degrees)

25

20

15

10

1750 1800 1850 1900 1950 2000

Year

Figure 10.4: Orientation of Goodwin Sands

10.22 Further analysis of the long-term changes prior to the 1997 survey is beyond the scope

and purpose of this report.

11. IMPLICATIONS FOR SHIPPING

11.1 As shown in Annex D, shipping generally avoids the shallowest, most mobile and

potentially treacherous areas of the Goodwin Sands, keeping well to the east, where

buoyage adequately mark the banks, or using the buoyed inner route of the Gull

Stream. Changes to the western side of the bank are occurring close to the buoyed

route and require monitoring more frequently than the main channel itself, along with

the area of sandwaves at the southern entrance. Ramsgate traffic crossing North Sand

Head would potentially be concerned should depths continue to shoal in the area.

11.2 Vessels are known to use The Downs and Trinity Bay region for shelter; expansion of

South Calliper into Trinity Bay would be of concern to these vessels and the survey

frequency needs to be adequate to capture these changes. Because of the

encroachment into Trinity Bay, and as a precautionary measure, Trinity House installed

a temporary Pillar buoy to mark the current limit of the bank ahead of the publication

of a New Edition of chart 1828.

12. RECOMMENDATIONS FOR FUTURE SURVEYS

GS1 South Sand Head

12.1 Due to the realignment and development of the southern limit of South Sand Head, the

area should continue to be resurveyed every 3 years. To align with the current position

of the bank, and adequately cover likely developments over the next 3 years, the limits

should be revised, as shown in Annex S.

Assessment Goodwin Sands/2009 – Original Page 13 of 51


GS2 Gull Stream

12.2 Due to bank mobility on the eastern side of the Gull Stream and sandwave mobility in

the southern entrance, the 3 year focused survey should continue, with minor changes

in limits as shown in Annex S.

12.3 North Sand Head shows evidence of some shoaling. Given the density of ferry traffic

crossing the bank and proximity of depths to maximum draughts, it is recommended

that a 3-year focused survey be introduced to cover the area, as shown in Annex S.

12.4 The full 6 year survey includes the northern entrance and western side of the channel.

Considering the stability of these areas, particularly the western side of the channel, a

reduction in limits or decrease in survey frequency may be possible. However, as the

full area covers the trafficked route through Gull Stream, and has only been fully

surveyed once with multibeam, it is recommended that another survey of the area be

conducted before revising the limits or frequency.

GS3 North Head of South Calliper

12.5 The migration of the bank supports continued surveying of the seaward side every 6

years, as shown in Annex S. Although the bank is likely to be still adequately marked

by East Goodwin buoy after that time, a north-easterly extension to the head of 550

metres over the last 12 years justifies not extending the survey period beyond 6 years

at present. The western side, which is deepening and away from the shipping routes,

should be transferred to GS4.

GS4 Goodwin Sands Inner Area

12.6 Due to the dynamic and shoal nature of the area it is avoided by shipping, although

some recreational and research activities, such as fishing, and wreck monitoring, are

known to take place. Changes are such that, if the 12 year re-survey interval is

retained, depths are likely to have changed notably by the time of the next survey (by

more than 10 metres in some places), with the potential uncovering of wrecks.

However, to capture changes more frequently could be considered disproportionate

considering avoidance of the area by large vessels and need for caution by small craft.

12.7 It is recommended that the 12-year survey interval is retained, but with slight changes

to the overall limits as shown in Annex S. In addition, due to the marked changes in

overall bank extents that have occurred at South Calliper, it is recommended that a 3-

year checkline survey of 250 metre spaced lines be carried out to capture the general

developments in bank limits, as shown in Annex S. The bank limits in the northeastern

part of GS4 should also be surveyed as a 250 metre spaced checkline survey,

but on the intervening 6 years between the full surveys.

Assessment Goodwin Sands/2009 – Original Page 14 of 51


12.8 The proposed area limits are as follows –

GS1 (3 yr)

a) 51˚.16100N 1˚.47550E

b) 51˚.15180N 1˚.50900E

c) 51˚.13640N 1˚.48200E

d) 51˚.14250N 1˚.46330E

GS2 (focused Gull Stream 3 yr)

a) 51˚.30583N 1˚.50350E

b) 51˚.30583N 1˚.52000E

c) 51˚.29714N 1˚.50579E

d) 51˚.27625N 1˚.47800E

e) 51˚.26000N 1˚.46000E

f) 51˚.23420N 1˚.44520E

g) 51˚.23667N 1˚.43000E

h) 51˚.26067N 1˚.45150E

i) 51˚.29583N 1˚.48883E

GS2 (focused North Sand Head 3 yr)

a) 51˚.33333N 1˚.53600E

b) 51˚.33333N 1˚.55000E

c) 51˚.31960N 1˚.55250E

d) 51˚.31960N 1˚.53600E

GS2 (full 6 yr)

a) 51˚.34167N 1˚.51167E

b) 51˚.34167N 1˚.54833E

c) 51˚.31960N 1˚.55250E

d) 51˚.31960N 1˚.54300E

e) 51˚.29000N 1˚.50000E

f) 51˚.25250N 1˚.46000E

g) 51˚.23333N 1˚.45067E

h) 51˚.23667N 1˚.43000E

i) 51˚.26333N 1˚.44333E

j) 51˚.32333N 1˚.51167E

GS3 (6 yr)

a) 51˚.27825N 1˚.57950E

b) 51˚.27825N 1˚.58869E

c) 51˚.25690N 1˚.59000E

d) 51˚.24090N 1˚.58415E

e) 51˚.24090N 1˚.57950E

Assessment Goodwin Sands/2009 – Original Page 15 of 51


GS4 (full 12 yr)

a) 51˚.31960N 1˚.55250E

b) 51˚.27825N 1˚.57300E

c) 51˚.27825N 1˚.57950E

d) 51˚.24090N 1˚.57950E

e) 51˚.24090N 1˚.58415E

f) 51˚.21600N 1˚.57300E

g) 51˚.18570N 1˚.53600E

h) 51˚.15180N 1˚.50900E

i) 51˚.16100N 1˚.47550E

j) 51˚.19400N 1˚.47670E

k) 51˚.21180N 1˚.49120E

l) 51˚.21720N 1˚.47500E

m) 51˚.25275N 1˚.49300E

n) 51˚.25680N 1˚.48080E

o) 51˚.23333N 1˚.45067E

p) 51˚.25250N 1˚.46000E

q) 51˚.29000N 1˚.50000E

r) 51˚.31960N 1˚.54300E

GS4 (focused South Calliper 3 yr)

a) 51˚.24090N 1˚.57950E

b) 51˚.24090N 1˚.58415E

c) 51˚.21600N 1˚.57300E

d) 51˚.18570N 1˚.53600E

e) 51˚.15180N 1˚.50900E

f) 51˚.16100N 1˚.47550E

g) 51˚.19400N 1˚.47670E

h) 51˚.21180N 1˚.49120E

i) 51˚.21720N 1˚.47500E

j) 51˚.24000N 1˚.48650E

k) 51˚.24000N 1˚.50000E

l) 51˚.21600N 1˚.50000E

m) 51˚.20000N 1˚.51300E

n) 51˚.20000N 1˚.53250E

o) 51˚.21600N 1˚.56000E

GS4 (focused Goodwin Knoll 3 yr)

a) 51˚.31960N 1˚.55250E

b) 51˚.27825N 1˚.57300E

c) 51˚.27825N 1˚.57950E

d) 51˚.27050N 1˚.57950E

e) 51˚.27050N 1˚.55300E

f) 51˚.31960N 1˚.54300E

Assessment Goodwin Sands/2009 – Original Page 16 of 51


13. REFERENCES

13.1 Cloet R. L. 1954: Hydrographic Analysis of the Goodwin Sands and the Brake Bank

13.2 United Kingdom Hydrographic Office, 1986: Report on the Analysis of Resurvey Area C1

13.3 United Kingdom Hydrographic Office, 1997: Report of Survey, Goodwin Sands

13.4 United Kingdom Hydrographic Office, 1999: The Goodwin Sands - Report on the

Analysis of Routine Resurvey Areas A, b, C, C1, C2 & C3

13.5 United Kingdom Hydrographic Office, 2003: Report of Survey, Gull Stream & North

Head of South Calliper

13.6 United Kingdom Hydrographic Office, 2006: Report of Survey, Gull Stream & South

Sand Head

13.7 United Kingdom Hydrographic Office, 2010: Report of Survey, Goodwin Sands 2009

Assessment Goodwin Sands/2009 – Original Page 17 of 51


ANNEX A-1

AREA SPECIFICATIONS

(Including Survey History)

REGION: Goodwin Sands NAME: South Sand Head AREA: GS1

LIMITS:

AREA SIZE:

a) 51°09.78 N 1°31.20 E

b) 51°08.43 N 1°29.80 E

c) 51°08.23 N 1°27.60 E

d) 51°10.23 N 1°28.90 E

2.78 SQ NM (9.54 SQ KM)

Area co-ordinates are

referred to WGS84 Datum

SURVEY INTERVAL: 3 yrs

SURVEY SCALE: 1:25,000 unless otherwise indicated (not applicable to multibeam survey).

SURVEYS: 1975 K7392 H4577/73

1976 K7646 H4845/75

1977 K7742 H1934/76

1978 K8003 H1962/77

1979 K8222 H1937/78

1980 K8552 H1938/78

1981 K8629 H1951/80 s.t.

1985 K9655 H2342/84 s.

1988 M1266 H6343/87 s.t.d.

1991 M1777 HH090/511/01 s.t.d

1994 M2308 HH090/630/01 s.d

1997 M2902 HH090/737/01 s.t.d.

2000 M3448 HH090/893/01 s.d.

2003 M3930 HH090/1027/01 s.d.

2006 M4566 - m

2009 SDRA200929529 m

REPORTS: 1980 Latest survey included K8222 (H1934/76)

1981 Latest survey included K8629 (H1934/81)

1999 Latest survey included M2902 (HA145/010/019/01)

ASSESSMENTS: 2002 Assessment of the 2000 Survey

2004 Assessment of the 2003 Survey

REMARKS: 1976 Report covering old area B (H1934/76)

1980 New Area B established (HA3913/80)

1999 Report changes area limits and identifier to GS1.

LARGEST SCALE CHART: BA 1828 (1:37,500)

KEY: s sonar sweep

t bottom texture tracing

d digital data available

m multibeam digital data

Assessment Goodwin Sands/2009 – Original Page 18 of 51


AREA SPECIFICATIONS

(Including Survey History)

ANNEX A-2

REGION: Goodwin Sands NAME: Gull Stream AREA: GS2

LIMITS: Full a) 51°20’.5N 01°30’.7E Focused a) 51°18’.3N 01°30’.2E

b) 51°20’.5N 01°32’.9E b) 51°17’.5N 01°29’.9E

c) 51°19’.6N 01°33’.2E c) 51°15’.5N 01°27’.7E

d) 51°15’.4N 01°28’.3E d) 51°14’.1N 01°26’.7E

e) 51°14’.0N 01°27’.4E e) 51°14’.1N 01°26’.1E

f ) 51°14’.2N 01°25’.8E

f) 51°15’.6N 01°27’.1E

g) 51°15’.8N 01°26’.6E g) 51°17’.7N 01°29’.3E

h) 51°19’.4N 01°30’.7E h) 51°18’.3N 01°30’.2E

AREA SIZE:

8.46 SQ NM (28.8 SQ KM) / 1.88 SQ NM (6.5 SQ KM)

SURVEY INTERVAL: Full Area 6 yrs, Focused Area 3 yrs

SURVEY SCALE: 1:25,000

Area co-ordinates are

referred to ETRS 89 Datum

SURVEYS: 1979 K8237 H1937/78

1980 K8552 H1938/78

1981 K8629 H1951/80 s.t.

1983 K9179 H3650/78

1984 K9564 H2907/83 s.t.

1985 K9883 H2331/85 s.t.

1988 M1263 H6342/87 s.t.d.

1991 M1777 HH090/511/01 s.t.d

1994 M2287 HH090/629/01 s.d.

1997 M2864 HH090/736/01 s.t.d.

1997 M2865 HH090/738/01 s.t.d

1997 M2882 HH090/738/01 s.t.d

2000 M3432 HH090/892/01 s.t.d

2003 M3936 HH090/1028/01 s.t.d

2006 M4586 HH090/1028/01 m

2009 SDRA200929529 m

REPORTS 1980 Latest survey included K8237 (H3650/78).

1981 Latest survey included K8629 (H3650/78).

1985 Latest survey included K9564 (H0423/85).

1986 Latest survey included K8552 (H0423/85).

1999 Latest survey included M2864 (HA145/010/019/01)

ASSESSMENTS: 2001 Assessment of 2000 survey (M3432)

2004 Assessment of 2003 survey (M3936)

REMARKS:

1980 Area A established. Old area A (H3913/80)

1980 Area C1 established. Part of old area C (H3913/80)

1980 Area C2 established. Part of old area C (H3913/80)

1999 Report amalgamates A, C1 & C2 into one area GS2 (limits altered)

2001 GS2 limits altered, also affects GS4, see Assessment March 2001

2004 Full area re-survey frequency extended from 3 yrs to 6 yrs; focused 3 yr area created

LARGEST SCALE CHART: BA 1828 (1:37,500)

BA 1827 (1:12,500) – northern part of area only

KEY: s sonar sweep

t bottom texture tracing

d

m

digital data available

multibeam

Assessment Goodwin Sands/2009 – Original Page 19 of 51


ANNEX A-3

AREA SPECIFICATIONS

(Including Survey History)

REGION: Goodwin Sands NAME: North Head of South Calliper AREA: GS3

LIMITS:

AREA SIZE:

a) 51°16’.63 N 1°35’.20 E

b) 51°15’.93 N 1°35’.60 E

c) 51°14’.43 N 1°35’.20 E

d) 51°14’.73 N 1°33’.50 E

e) 51°16’.03 N 1°33’.50 E

2.14 SQ NM (7.34 SQ KM)

Area co-ordinates are

referred to ETRS89 Datum

SURVEY INTERVAL: 6 yrs NEXT SURVEY DUE: 2009

Note: Survey brought forward to coincide with GS1 & GS2 surveys in 2003.

SURVEY SCALE: 1:25,000 unless otherwise indicated

PREVIOUS SURVEYS: 1980 K8552 H1938/78

1986 K9866 H2333/85 s.t.

1991 M1777 HH090/511/01 s.d.t

1997 M2866 HH090/741/01 s.d.c

1998 M3054 HH090/820/01 s.d.t

2003 M3935 HH090/1029/01 s.d.t

2009 SDRA200929529 m

REPORTS: 1986 Latest survey included K8552 (H0423/86)

1999 Latest survey included M3054 (HA145/010/019/01)

ASSESSMENTS: none

REMARKS: 1980 Area C3 established. Part of old area C (H3913/80).

1999 Report changed area limits and identifier from C3 to GS3

LARGEST SCALE CHART: BA 1828 (1:37,500)

KEY: s sonar sweep

t bottom texture tracing

d digital data available

c checklines

Assessment Goodwin Sands/2009 – Original Page 20 of 51


ANNEX A-4

AREA SPECIFICATIONS

(Including Survey History)

REGION: Goodwin Sands NAME: Goodwin Sands AREA: GS4

LIMITS:

AREA SIZE:

a) 51°19’.60 N 1°33.20 E

b) 51°18’.53 N 1°34.05 E

c) 51°16’.63 N 1°35.20 E

d) 51°16’.03 N 1°33.50 E

e) 51°14’.73 N 1°33.50 E

f ) 51°14’.43 N 1°35.20 E

g) 51°12’.78 N 1°34.60 E

h) 51°09’.78 N 1°31.20 E

i ) 51°10’.23 N 1°28.90 E

j ) 51°12’.43 N 1°30.30 E

k) 51°13’.03 N 1°28.50 E

l ) 51°14’.53 N 1°29.60 E

m) 51°15’.00 N 1°28.04 E

n) 51°15’.40 N 1°28.30 E

23.07 SQ NM (79.13 SQ KM)

Area co-ordinates are

referred to ETRS89 Datum

SURVEY INTERVAL: 12 yrs NEXT SURVEY DUE: 2009

SURVEY SCALE: 1:25,000 unless otherwise indicated

PREVIOUS SURVEYS: 1980 K8552 H1938/78

1990 M1655 HH090/511/01 s.d.

1991 M1777 HH090/511/01 s.t.d

1997 M2865 HH090/738/01 s.t.d

2003* M3930 HH090/1027/01 s.d

2009 SDRA200929529 m

* Check lines run over South Calliper bank (on eastern side of the area)

REPORTS: 1984 Latest survey included K8552 (no reference).

1999 Latest survey included M2865 (HA145/010/019/01).

ASSESSMENTS: none

REMARKS: 1980 Area C established. Part of old area C (HA3913/80).

1999 Area limits altered. Identifier changed to GS4.

LARGEST SCALE CHART: BA 1828 (1:37,500)

KEY: s sonar sweep

t bottom texture tracing

d digital data available

Assessment Goodwin Sands/2009 – Original Page 21 of 51


ANNEX B

GOODWIN SANDS RESURVEY SCHEME

GS2

(3/6 yrs)

2003 (Full)

2006 (Focused)

GS3

(6 yr)

2003

GS4

(12 yr)

1997

GS1

(3 yr)

2006

_________ Full Survey Limits

- - - - - Focused Survey Limits

Details show area identifier,

survey frequency and year of

previous survey

Assessment Goodwin Sands/2009 – Original Page 22 of 51


ANNEX C

SUN-ILLUMINATED VIEW OF THE 2009 SURVEY

SHOWING BANK AND CHANNEL MIGRATION






Area of significant

sediment removal

∆ Steepest side in areas of

asymmetric banks

Assessment Goodwin Sands/2009 – Original Page 23 of 51


ANNEX D

SHIPPING ROUTES

Main shipping routes

Other routes (representative tracks)

Assessment Goodwin Sands/2009 – Original Page 24 of 51


SUN-ILLUMINATED VIEW OF THE 2009 SURVEY AND

LOCATION OF CROSS-SECTIONS SHOWN AT ANNEX F

ANNEX E

E

G

H

F

C

D

A

B

Assessment Goodwin Sands/2009 – Original Page 25 of 51


ANNEX F

SURVEY CROSS-SECTIONS

(see Annex E for locations)

GS1: South Sand Head

Depth (m)

5

0

-5

-10

-15

-20

-25

-30

2006

2009

0 1000 2000 3000

Distance (m)

A Profile A – B B

Depth (m)

5

0

-5

-10

-15

-20

-25

-30

GS4: South Calliper

0 1000 2000 3000 4000

Distance (m)

1997

2009

C Profile C – D D

Assessment Goodwin Sands/2009 – Original Page 26 of 51


GS4: Goodwin Sands

Depth (m)

10

0

-10

-20

-30

-40

1997

2009

Kellet

Gut

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000

Distance (m)

E Profile E – F F

GS3: North Head of South Calliper

Depth (m)

0

-5

-10

-15

-20

1997

2003

2009

-25

-30

0 500 1000 1500

Distance (m)

G Profile G – H H

Assessment Goodwin Sands/2009 – Original Page 27 of 51


ANNEX G-1

COLOUR BANDED DEPTH PLOT

FROM THE 1997 SURVEY

SHOWING SELECTED DEPTHS

Scale 1:75,000

Selected depth comparisons

Depths in Metres

Drying Heights

0.1 to 5.0

5.1 to 10.0

10.1 to 40.0

Metres 2000

1000

0

2000

4000

6000 Metres

Assessment Goodwin Sands/2009 – Original Page 28 of 20


ANNEX G-2

COLOUR BANDED DEPTH PLOT

FROM THE 2009 SURVEY

SHOWING SELECTED DEPTHS

SCALE 1:75,000

Selected depth comparisons

Depths in Metres

Drying Heights

0.1 to 5.0

5.1 to 10.0

10.1 to 40.0

Metres 2000

1000

0

2000

4000

6000 Metres

Assessment Goodwin Sands/2009 – Original Page 29 of 20


ANNEX H

VARIABILITY PLOT SHOWING BATHYMETRIC CHANGES

BETWEEN THE 1997 AND 2009 SURVEY DATA

AND CHARTED CONTOURS FROM THE 2009 SURVEY

SCALE 1:75,000

22.0

Metres

10.0

3.0

0.5

-0.5

-3.0

-10.0

-27.0

Shoaling Deepening

Metres 2000

1000

0

2000

4000

6000 Metres

Assessment Goodwin Sands/2009 – Original Page 30 of 20


ANNEX I-1

COMPOSITE DIAGRAM OF THE

2 METRE CONTOUR

FROM THE 1997 AND 2009 SURVEYS

Scale 1:75,000

Year of Survey

_____

2009

_____

1997

Metres 2000

1000

0

2000

4000

6000 Metres

Assessment Goodwin Sands/2009 – Original Page 31 of 20


ANNEX I-2

COMPOSITE DIAGRAM OF THE

5 METRE CONTOUR

FROM THE 1997 AND 2009 SURVEYS

Scale 75,000

Year of Survey

_____

2009

_____

1997

Metres 2000

1000

0

2000

4000

6000 Metres

Assessment Goodwin Sands/2009 – Original Page 32 of 20


COMPOSITE DIAGRAM OF THE

10 METRE CONTOUR

FROM THE 1997 AND 2009 SURVEYS

Scale 1:75,000

ANNEX I-3

Year of Survey

_____

2009

_____

1997

Metres 2000

1000

0

2000

4000

6000 Metres

Assessment Goodwin Sands/2009 – Original Page 33 of 20


ANNEX I-4

COMPOSITE DIAGRAM OF THE

15 METRE CONTOUR

FROM THE 1997 AND 2009 SURVEYS

Scale 1:75,000

Year of Survey

_____

2009

_____

1997

Metres 2000

1000

0

2000

4000

6000 Metres

Assessment Goodwin Sands/2009 – Original Page 34 of 20


ANNEX J-1

COLOUR BANDED DEPTH PLOT

FROM THE 2006 SURVEY

SHOWING SELECTED DEPTHS

AREA GS1

Scale 1:30,000

1 9

10

8 2

16 5

Depths in Metres

Drying Heights

0.1 to 5.0

Selected depth comparisons

5.1 to 10.0

10.1 to 40.0

16 5

2009 survey depth

Assessment Goodwin Sands/2009 – Original


ANNEX J-2

COLOUR BANDED DEPTH PLOT

FROM THE 2009 SURVEY

SHOWING SELECTED DEPTHS

AREA GS1

Scale 1:30,000

Depths in Metres

Drying Heights

0.1 to 5.0

Selected depth comparisons

5.1 to 10.0

10.1 to 40.0

Assessment Goodwin Sands/2009 – Original


ANNEX K

VARIABILITY PLOT SHOWING BATHYMETRIC CHANGES

BETWEEN THE 2006 AND 2009 SURVEY DATA

AND CHARTED CONTOURS FROM THE 2009 SURVEY

AREA GS1

Scale 1:30,000

>5.0

5.0

Metres

3.0

1.5

0.5

-0.5

-1.5

-3.0

-5.0

>-5.0

Shoaling Deepening

Assessment Goodwin Sands/2009 – Original


ANNEX L-1

COMPOSITE DIAGRAM OF THE

5 METRE CONTOUR

FROM THE 2006 AND 2009 SURVEYS

AREA GS1

Scale 1:30,000

Year of Survey

_____

2009

_____

2006

Assessment Goodwin Sands/2009 – Original


ANNEX L-2

COMPOSITE DIAGRAM OF THE

10 METRE CONTOUR

FROM THE 2006 AND 2009 SURVEYS

AREA GS1

Scale 1:30,000

Year of Survey

_____

2009

_____

2006

Assessment Goodwin Sands/2009 – Original


ANNEX L-3

COMPOSITE DIAGRAM OF THE

15 METRE CONTOUR

FROM THE 2006 AND 2009 SURVEYS

AREA GS1

Scale 1:30,000

Year of Survey

_____

2009

_____

2006

Assessment Goodwin Sands/2009 – Original Page 40 of 51


ANNEX M-1

COLOUR BANDED DEPTH PLOT

FROM THE 2003 SURVEY

SHOWING SELECTED DEPTHS

AREA GS2

Scale 1:60,000

8 7

Selected depth comparisons

5 6

2009 survey depth

5 7

4 9

4 9

0 6

5 4

Depths in Metres

Drying Heights

0.1 to 5.0

5.1 to 10.0

10.1 to 40.0

Assessment Goodwin Sands/2009 – Original Page 41 of 51


ANNEX M-2

COLOUR BANDED DEPTH PLOT

FROM THE 2009 SURVEY

SHOWING SELECTED DEPTHS

AREA GS2

Scale 1:60,000

Selected depth comparisons

Depths in Metres

Drying Heights

0.1 to 5.0

5.1 to 10.0

10.1 to 40.0

Assessment Goodwin Sands/2009 – Original Page 42 of 51


ANNEX N

VARIABILITY PLOT SHOWING BATHYMETRIC CHANGES

BETWEEN THE 2003 AND 2009 SURVEY DATA

AND CHARTED CONTOURS FROM THE 2009 SURVEY

AREA GS2

Scale 1:60,000

>5.0

5.0

Metres

3.0

1.5

0.5

-0.5

-1.5

-3.0

-5.0

>-5.0

Shoaling Deepening

Assessment Goodwin Sands/2009 – Original Page 43 of 51


ANNEX O-1

COMPOSITE DIAGRAM OF THE

5 METRE CONTOUR

FROM THE 2003 AND 2009 SURVEYS

AREA GS2

Scale 1:60,000

Year of Survey

_____

2009

_____

2003

Assessment Goodwin Sands/2009 – Original Page 44 of 51


ANNEX O-2

COMPOSITE DIAGRAM OF THE

10 METRE CONTOUR

FROM THE 2003 AND 2009 SURVEYS

AREA GS2

Scale 1:60,000

Year of Survey

_____

2009

_____

2003

Assessment Goodwin Sands/2009 – Original Page 45 of 51


ANNEX P-1

COLOUR BANDED DEPTH PLOT

FROM THE 2003 SURVEY

SHOWING SELECTED DEPTHS

AREA GS3

Scale 1:25,000

8 2

Selected depth comparisons

2009 survey depth

8 2

4 7

Depths in Metres

Drying Heights

0.1 to 5.0

5.1 to 10.0

10.1 to 40.0

Assessment Goodwin Sands/2009 – Original Page 46 of 51


ANNEX P-2

COLOUR BANDED DEPTH PLOT

FROM THE 2009 SURVEY

SHOWING SELECTED DEPTHS

AREA GS3

Scale 1:25,000

Selected depth comparisons

2 9

2003 survey depth

2 9

Depths in Metres

Drying Heights

0 3

0.1 to 5.0

5.1 to 10.0

10.1 to 40.0

Assessment Goodwin Sands/2009 – Original Page 47 of 51


ANNEX Q

VARIABILITY PLOT SHOWING BATHYMETRIC CHANGES

BETWEEN THE 2003 AND 2009 SURVEY DATA

AND CHARTED CONTOURS FROM THE 2009 SURVEY

AREA GS3

Scale 1:25,000

>5.0

5.0

Metres

3.0

1.5

0.5

-0.5

-1.5

-3.0

-5.0

>-5.0

Shoaling Deepening

Assessment Goodwin Sands/2009 – Original Page 48 of 51


ANNEX R-1

COMPOSITE DIAGRAM OF THE

5 METRE CONTOUR

FROM THE 2003 AND 2009 SURVEYS

AREA GS3

Scale 1:25,000

Year of Survey

_____

2009

_____

2003

Assessment Goodwin Sands/2009 – Original Page 49 of 51


ANNEX R-2

COMPOSITE DIAGRAM OF THE

10 METRE CONTOUR

FROM THE 2003 AND 2009 SURVEYS

AREA GS3

Scale 1:25,000

Year of Survey

_____

2009

_____

2003

Assessment Goodwin Sands/2009 – Original Page 50 of 51


PROPOSED REVISED LIMITS

ANNEX S

GS2

Focused

(3 Yrs)

GS2

Focused

(3 Yrs)

GS2

(6 Yrs)

GS4

Checkline

(6 Yrs)

GS3

(6 Yrs)

GS4

(12 Yrs)

GS4

Checkline

(3 Yrs)

GS1

(3 Yrs)

Existing Survey Limits

Proposed Full Survey Limits

- - - - - Focused Survey Limits

….….. Checkline Survey Limits

Assessment Goodwin Sands/2009 – Original Page 51 of 51

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