Dealing with salinity in Wheatbelt Valleys - Department of Water

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slope, curvature and sizes of catchment areas, which may be used in environmental assessments and risk analysis. For the Western Australian Wheatbelt, the advent of relatively high-resolution DEMs (elevations accurate to 1-2 m sampled on a 10 m easting/northing grid) from the Land Monitor project, allows a great variety of variables to be accurately derived, e.g. Caccetta 1999b. Here we outline an approach for extracting broadvalleys from DEMs: A sample of digital elevation data generated by the Landmonitor project was used in the experiments. The data has an accuracy of approximately 1-2 m in elevation and is specified on a 10 m grid. The data were processed in a manner consistent with that currently being used for the salinity mapping component of the Land Monitor Project: 1. the data are smoothed to remove small discontinuities (Caccetta 1999a), Commander, Schoknecht, Verboom and Caccetta 2. the data are resampled to 25 m, reducing the data volume and making the data consistent with landsat TM, 3. spurious depressions are filled to ensure surface flow (Caccetta 1999b), 4. an estimate of upslope area and flowslope is calculated, from which `flat’ flowpaths are extracted, 5. the height above the nearest flat flowpath is derived, 6. all pixels having an elevation within 2 m of the nearest flat flowpath are classed as valley floors, 7. all remaining pixels are given a landform label based on stratifying the upslope area image into hilltops, ridges and upper slopes, upper valleys and lower valleys. Figure 14: An example of a landform classification derived from a DEM. Hilltops are depicted as dark blue, ridges and upper slopes as cyan, upper valleys as green, lower valleys as orange and broad valleys as red. For visual purposes, the classification has been enhanced with sun shading – 19 –
Commander, Schoknecht, Verboom and Caccetta This process results in a landform classification having the following classes: hilltops, ridges and upper slopes, upper valleys, lower valleys, and broad valleys. An example of this partitioning is given in Figures 14 and 15. Here we note that the procedure may be applied with relative ease to extract broad valleys over large areas, and thus provides an accurate and consistent way of mapping valleys over large areas. Figure 15: The landform partitioning may be applied over large areas to extract classes of interest. As in Figure 14, hilltops are depicted as dark blue, ridges and upper slopes as cyan, upper valleys as green, lower valleys as orange and broad valleys as red. Figure 16: This figure depicts low lying areas with the potential for high water tables. In this figure areas with the potential for high water tables are coloured blue to yellow, as indicated by the colour bar in the figure. A grey-scale Landsat TM mosaic, along with a 1:100 000 map-sheet grid, is provided for reference. The region is approximately 400 x 400km, with the Swan River visible in the lower left – 20 –
Page 1 and 2: Foreword Dealing with Salinity in W
Page 3 and 4: 1Day one: Monday 30th July. Field t
Page 5 and 6: Papers Dealing with Salinity in Whe
Page 7 and 8: Ali and Coles biggest challenges fa
Page 9 and 10: Ali and Coles erosion, maintenance
Page 11 and 12: Ali and Coles expected under these
Page 13 and 14: Ali and Coles Coles, N.A. & Ali, M.
Page 15 and 16: Commander, Schoknecht, Verboom and
Page 31: Commander, Schoknecht, Verboom and
Page 41 and 42: APPRECIATING AND CREATING OUR HISTO
Page 43 and 44: services. The Government responded
Page 45 and 46: WHEATBELT VALLEYS IN DIFFICULTIES T
Page 47 and 48: argue that they were really abnorma
Page 49 and 50: 1990s, the wheatbelt valleys in par
Page 51 and 52: REFERENCES Agstats (1997). Agricult
Page 53 and 54: George and Coleman two to four fold
Page 55 and 56: George and Coleman surface, the vas
Page 57 and 58: George and Coleman for example in t
Page 59 and 60: George and Coleman current trends c
Page 61 and 62: George and Coleman While not as div
Page 63 and 64: George and Coleman SPECIES Table 5:
Page 65 and 66: George and Coleman advantages of so
Page 67 and 68: George and Coleman this volume). In
Page 69 and 70: George and Coleman Venture Economy
Page 71 and 72: George and Coleman Lawrence, C. (19
Page 73 and 74: Hatton and Ruprecht WATCHING THE RI
Page 75 and 76: Since the mid 1970s annual rainfall
Page 77 and 78: Effect of clearing on runoff The ot
Page 79 and 80: Salinity Monthly streamflow (ML) 10
Page 81 and 82: The ratio of the salt outputs to in
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- 11 - Hatton and Ruprecht Table 4:
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THE FUTURE In looking at the future
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McFarlane, D.J., George, R.J. & Far
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Keighery, Halse and McKenzie Terres
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Keighery, Halse and McKenzie Wetlan
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Keighery, Halse and McKenzie specie
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Keighery, Halse and McKenzie enviro
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Lloyd number of legal cases pending
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Lloyd 0 -500 -1000 -1500 -2000 -250
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Lloyd Table 3. Sheep grazing days i
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Lloyd Hectares project to provide w
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INTRODUCTION The Lake Chinocup Catc
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agriculture) in various stages, the
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- 3,477 ha of remnant vegetation or
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Scientists talk of up to 30% of the
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6320000 6300000 6280000 6260000 624
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Although the waterlogged area under
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eliminates drainage through the nex
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REFERENCES Dawes, W.R., Stauffacher
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Pannell ECONOMICS, SOCIETY AND ENVI
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Pannell • the area of land protec
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Pannell Proposals to construct majo
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Pannell been conducted for the Cent
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Pannell investments in long-term la
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Pannell Pannell, D.J. (2001). Dryla
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Porter, Bartle and Cooper Table 1:
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Porter, Bartle and Cooper operation
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Porter, Bartle and Cooper Increase
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Porter, Bartle and Cooper support i
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Porter, Bartle and Cooper that is a
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CASE STUDY - TOOLIBIN LAKE AND CATC
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• The distribution, storage and m
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Secondly, there is a set of practic
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within three categories: relationsh
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CONCLUSIONS Actions to protect and
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FIELD TOUR LOCATIONS FIELD TOUR NOT
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COLES FARM “Avon River Basin Over
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Conference Outcomes Dealing with Sa
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with Salinity in Wheatbelt Valleys:
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with Salinity in Wheatbelt Valleys
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Photo Gallery 2 Dealing with Salini
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APPENDIX 1 BACKGROUND HYDROLOGY AND
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WHEATBELT HYDROLOGY Flow in the Yil
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Flow (ML) STREAM SALINITY Salt Rive
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APPENDIX 2 WATER MANAGEMENT OPTIONS
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APPENDIX 3 MANAGING WATER AND SALIN
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SUMMARY- TIMELINE OF RECENT SIGNIFI
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RECENT HISTORY OF WATER AND SALINIT
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Figure 1. Hydrological cross-sectio
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Depth (m) 316 315 314 313 312 311 M
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FURTHER INVESTIGATIONS AND MANAGEME
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Dealing with salinity in Wheatbelt Valleys - Department of Water

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