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nodules from surface sediments; the bottom vehicle will move at velocities of about 1 m/second. The most interesting findings were that only about 20% of the sediment affected by mining will be resuspended, while most of it will form large chunks, will be remoulded and will quickly resettle behind the miner. For these boundary conditions, a solid mass flow of 85 kg/s was calculated for the resuspended material. This would induce a suspension cloud of about 54 m 3 /s with a solid mass of 1.6 grams/litre. Conclusion: The results are considered a first approach; additional parameters for a realistic impact assessment are needed. In particular, a determination of sediment grain size must take account of how nodules are collected. In situ tests using a specific mining procedure will help to define a more realistic model of sediment resuspension than that based on laboratory-defined grain-size composition. 3.2. Near-bottom sediment transport modelling Jankowski & Zielke 17 have calculated near-bottom sediment transport in the Peru Basin based on the following assumptions: a sediment discharge of 10 kg/s for a duration of one day, resuspended in six days, and bottom current velocity mostly
3.3. Modelling long-term propagation of tailings (for DISCOL area) Rolinski & Sündermann 18 used a global scale Lagrangian transport model to calculate the dispersion of tailings released from a mining vessel in the Peru Basin. To arrive at realistic current velocities, a global geostrophic circulation model was used. Their results rest on the following assumptions: Currents are determined according to the large-scale geostrophic ocean model; bottomcurrent velocity is mostly 3-5 cm/s. The authors used two grain-size distribution curves, one determined by grain-size analysis in the laboratory, and the second, coarser one, from Oebius and co-authors 19 . Significant results are: For grain-size distribution A (mainly 1-70 microns): ?? Resettlement of 90% of tailings will occur within 3-10 years for a release depth 3000 m below the sea surface, resuspended 500 m below the surface. ?? Assuming El Niño conditions, transport will be directed predominantly eastward and deposition will occur near the coast; assuming La Niña conditions, a predominant transport direction is less apparent, but will be westward for releases at great water depths. For grain-size distribution B (mainly 5-300 µm): ?? Deposition will be nearly instantaneous (99% within
Page 1 and 2:
STANDARDIZATION OF ENVIRONMENTAL DA
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The designations employed and the p
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Chapter 8 Chapter 9 Chapter 10 Chap
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Standardization of Environmental Da
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Foreword Statement by the Secretary
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Participants Mr. Baïdy Diène, Spe
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Dr. Rahul Sharma, Scientist, Nation
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“Necessary measures shall be take
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three working groups, on chemistry
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Some vital procedures are not amena
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(Kingston, Jamaica), 289 pp. The re
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He observed that the Regulations, u
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Dr. Smith reviewed in detail the pr
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Notes and References 1. Internation
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- The Authority must be notified of
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area, but within one or two years e
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- A description of proposed measure
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??It has been previously made avail
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SUMMARY OF DISCUSSION Financial obl
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In the discussion, flexibility in t
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Chapter 2 Overview of the Authority
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2.3. Chemical oceanography - Object
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3. Environmental Impact Assessment
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?? Nodule crushing methods, if any;
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SUMMARY OF DISCUSSION Biological co
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The Secretary-General responded tha
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edeposit on the surrounding seafloo
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1.3. Importance of standardization
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detailed guidelines recommended by
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and “transect physical oceanograp
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eference to seven biological catego
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2.4.1.6. Demersal scavengers It is
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e measured must be specified. I rec
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3.2. Taxonomic standardization I st
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ecological comparisons. Several oth
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that supplied the benthos with ener
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speculate on the rates of recolonis
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Geographical variation Speaking nex
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Knowledge limitations Concluding hi
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on the other hand it turned out tha
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ecolonisation rates. If the area wa
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had been used to look at resediment
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ecover. In the case of the seabed,
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13. International Seabed Authority,
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Chapter 3 Current State of Knowledg
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side. Exploration contractors will
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However, for scientific endeavours
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50-m altitude (i.e., within the bot
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2.4. Biological communities The LTC
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sediment/water interface of each bo
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strata), with sampling on a diel ba
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abyssal seafloor communities 25 sea
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very useful to the design of baseli
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PRESENTATION ON DEEP-SEA ECOSYSTEM
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Most of the seabed macrofauna in th
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the CCFZ. Without understanding lev
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One could also make the opposite ar
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had to be mined each day. Assuming
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There was an increasing appreciatio
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whether the effects were severe in
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collect samples wherever he went in
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Forschungsverbund Tiefsee-Umweltsch
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25. C.R. Smith et al (1997), Latitu
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esistance and resilience of seafloo
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other parameters had been recorded
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environment, a conscious effort was
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oceanographic measurements, monitor
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Chapter 4 Priorities for Environmen
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and government organisations have c
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information. On the other hand, the
Page 141 and 142: contractors (1.5 x 10 6 km 2 ). Dur
Page 143 and 144: Contractors must carefully optimise
Page 145 and 146: 3.4. Benthic and demersal community
Page 147 and 148: for environmental characterisation
Page 149 and 150: 4.2.3. Observations of marine mamma
Page 151 and 152: Local topography exerts significant
Page 153 and 154: ooze can consist of more than 90% o
Page 155 and 156: Table 3 Benthic currents in the CCF
Page 157 and 158: 5.3.2. Benthic currents and sedimen
Page 159 and 160: polychaetes and nematodes in the co
Page 161 and 162: from the DOMES sites illustrate thi
Page 163 and 164: 5.5.1.1. Climate The climate is dom
Page 165 and 166: Surface temperatures typically reve
Page 167 and 168: process. With increasing depth, pho
Page 169 and 170: phosphorus. In the oceanic environm
Page 171 and 172: are found at about 40 m, while the
Page 173 and 174: often seen closer to land. The Paci
Page 175 and 176: square kilometres in two different
Page 177 and 178: In closing, Morgan discussed how to
Page 179 and 180: C.L. Morgan, N.A. Odunton and A.T.
Page 181 and 182: 26. Y. Morel and R. LeSuave (1986),
Page 183 and 184: 45. United States Office of Ocean M
Page 185 and 186: 68. Ibid. 69. Ibid. 70. Ibid. 71. T
Page 187 and 188: 300 m deep basins alternating with
Page 189 and 190: in water depths at or close to the
Page 191: eyond the semi-liquid layer, to whi
Page 195 and 196: ) Take two or three cores at each s
Page 197 and 198: facies type, which was affected by
Page 199 and 200: Another useful way to define the to
Page 201 and 202: transport would not take any partic
Page 203 and 204: Use of geological data for environm
Page 205 and 206: Mining of Polymetallic Nodules from
Page 207 and 208: About 50 scientists were involved i
Page 209 and 210: the programme was to learn the beha
Page 211 and 212: econciled with the findings of othe
Page 213 and 214: located at almost every 2-minute in
Page 215 and 216: ?? Geological studies: ?? Bathymetr
Page 217 and 218: the tracks. The range and average o
Page 219 and 220: designed to minimise the plume risi
Page 221 and 222: SUMMARY OF DISCUSSION Sediment cond
Page 223 and 224: mining system would remain suspende
Page 225 and 226: design a collector. That device had
Page 227 and 228: ?? For the upper layer environmenta
Page 229 and 230: Figure 1 Survey components of the u
Page 231 and 232: Figure 2. Map of the investigation
Page 233 and 234: 2.4. Sample processing and size cat
Page 235 and 236: Figure 5 Schematic illustration of
Page 237 and 238: JET 3: the field study conducted on
Page 239 and 240: Besides the above, measurements wer
Page 241 and 242: 3.3. Sample processing and size cat
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Figure 10. Location of the five FDC
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?? Calculation from discharged sedi
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5. Total mass of dried sediment dis
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Figure 14 Thickness contour map of
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The use of GIS has many advantages.
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than the 200-metre depth distributi
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Among the chemical parameters, the
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SUMMARY OF DISCUSSION Impact of dis
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Mining (Metal Mining Agency of Japa
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Chapter 9 Data Standards Utilised i
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the three major categories of the b
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Various kinds of equipment were bei
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for biological research, but if it
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Asked for an estimate of the microb
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Sibuet agreed with Smith, emphasisi
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Chapter 10 Data Standards Utilised
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2.1.4. High precision depth recorde
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2.2.6. Piston corer ?? Acquiring bo
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2.3.3. Geotechnical properties ?? U
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?? Concentration of cells by settle
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3.3. Zooplankton (protozoan) 3.3.1.
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?? The abundance data from the phot
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4.3. Statistical analysis Kriging w
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Figure 4 Sampling-sites map of KODO
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o Temperature ( C) o 5 N o 6 N o 7
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PRESENTATION AND DISCUSSION OF DATA
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een placed in the experimental bott
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phosphate concentration had been me
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KORDI was having trouble with a 10-
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Other environmental studies Lee sai
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Chapter 11 Data Standards Utilised
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2. Hydrochemical investigations Hyd
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and 5-6 cm. Samples from all layers
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4. Proposals 1. To evaluate environ
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second part of BIE, beginning in 20
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counted and classified into higher
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procedures could be followed for th
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PART III Environmental Parameters N
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a third trap beneath the two that h
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of a nodule-strewn plain, picking u
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Possible impacts on the pelagic com
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Chapter 12 Chemical Oceanography Dr
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To obtain quality data on metals in
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egin right from the start of the ac
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was ambient water. The system teste
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characteristics of sediments in the
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discussed by Dr. Gerald Matisoff (c
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Citing difficulties in measuring sh
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Sediment traps A participant asked
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Commenting on a suggestion to utili
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diversity at the community level. A
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Stuart and Rex 22 have shown that l
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the fauna in these samples. If the
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made up of mountain chains, faultin
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adiated extensively there in many e
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etween shelf and slope adjoined an
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een mined some time before, and con
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Another participant observed that h
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identifying species at various loca
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addition, the multi-corer was being
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20. R.J. Etter and L.S. Mullineaux
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Chapter 15 Seafloor Macrofauna in P
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Figure 2 The plough-harrow. 1. Resu
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deeper sediment and soft, partly re
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Year No. Year Phase 0 1989 Baseline
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uttons on the onboard unit so that
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a stainless steel collar with three
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the majority of samples were obtain
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whirled up into the plume may reset
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to recover (see above) and the comm
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Different methods have been propose
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For the 12 most abundant families o
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area in the southeast Pacific Ocean
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should be treated with a lot of wat
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ack-up camera, had also housed smal
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in 1992 compared to 1989. Seven yea
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distribution of the samples. Anothe
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have reacted similarly by becoming
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Another participant thought that th
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Need for a large-scale experiment A
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3. E.J. Foell, H. Thiel and G. Schr
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22. Detailed description in ibid. 2
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held in Sanya, Hainan Island, Peopl
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1.1. Meiofaunal abundance Some exam
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Central Equatorial Pacific 2° N 44
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Nematode ecological diversity is un
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discrete but morphologically simila
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too difficult to deal with and were
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Institution, had collected 148 spec
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California and the Rockall Trough),
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Another factor supposed to influenc
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shallow water, where nematodes were
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speaking, TNHM had the types for an
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samples every two days. The equipme
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marine nematologist there were 10,0
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core might have worked because the
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16. P.J.D. Lambshead (2001), Marine
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Chapter 17 Pelagic Community Impact
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1.2. Potential phytoplankton impact
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spatial variability. Sampling shoul
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2.6. Zooplankton Depth-stratified s
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helping to achieve consensus among
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One potential impact of discharging
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Consequently, in sampling these reg
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elevated levels of cadmium. It migh
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?? Marine mammals and seabirds: The
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Asked whether the impact would be d
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on some of the mesopelagic fishes.
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9. K.H. Coale (1998), The Galapagos
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PART IV Sampling, Database and Stan
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In the discussion, one participant
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The paper went on to make recommend
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1. Challenges for Developing a Base
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and impact sites were attributed to
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differential response of the commun
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etter assess the spatial extent of
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x x x x x x x x x x x x x x x x x x
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Challenges to sampling studies If p
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un. On the other hand, if test mini
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the plume, could be a large area wi
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e needed to elucidate data about do
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and he might be underestimating. An
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Chapter 19 Database Requirements Dr
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• Professional Development and Ma
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model used at the British Museum of
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Agreeing, Rex said the management o
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the importance of including informa
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Environmental concerns The Secretar
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Asking participants for their views
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A participant suggested that echino
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detritus in the oceans. Smith agree
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oceanographer, go to sea with the v
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A participant observed that, by the
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controversial items such as macrofa
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Chapter 21 Standardization Strategi
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have described methods for the stud
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a. Direct impacts along the track o
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3.3.2. Water column As the operatio
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3.6. Applications of environmental
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d. The duration of the operations w
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?? Avoiding the disturbance of the
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information for consideration and a
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?? Total inorganic carbon by coulom
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Table 2 Core sections analyzed for
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4200- 4400 4400- 4600 4600- 4800 48
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Besides their utility for impact as
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Turning to the requirements for fut
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SUMMARY OF DISCUSSION Size of envir
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Asked whether he thought the result
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2. J. S. Chung and K. Tsurusaki (19
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PART V Conclusions and Recommendati
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Chapter 22 Report of the Workshop T
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identified in square brackets [BB =
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available such information as (1) k
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y the Commission as ISBA/7/LTC/1/Re
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1. Sediment Properties Sediment pro
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Table 2 lists the chemical paramete
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4. Trace metals in benthic and epi-
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The following key parameters should
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enthic boundary layer) to evaluate
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a. Meteorological variables: sea st
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3. A.R. Hiby and P.S. Hammond (1989
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DGPS differential global positionin
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PEIS P-I POC PON PRZ QA/QC RCM RDBM
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Discipline Category Parameter Metho
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Discipline Category Parameter Metho
Page 575 and 576:
Area Parameters Instruments Levels
Page 577 and 578:
3b Parameter Variables Methodology
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