GEOMORPHOLOGY REPORT - CRC LEME

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Figure 8. Location of soil sample sites western end of Lindsay-Wallpolla and Lake Victoria- Darling Anabranch. Figure 9. Location of soil sample sites eastern end of Lindsay-Wallpolla and Lake Victoria- Darling Anabranch. Note that some lie outside the defined survey area, as they were collected prior to the southern limits being finally decided. 15
6.1 Granulometry 6.1.1 Methodology Granulometrey provides a quantitative measurement of the particle size distribution in a soil or sediment. As a result much more accurate modelling of parameters such as porosity and permeability, recharge, and salt load can be made. It also provides a check on the accuracy of field estimates of soil texture. The grainsize was determined using a Malvern Instruments Mastersizer 2000 instrument. The laser diffraction instrument consists of three parts, a laser source (He-Ne gas or diodes emitter), detectors, and sample chamber that allows suspended particles to recirculate in front of the laser beam. The Mie theory (Rawle, 2001) was used to solve the equations for interaction of light with matter and calculates the volume of the particle. This technique calculates the % volume of a range of particle sizes (0.05 – 2000 μm), and the results are grouped according to the Wentworth scale. To standardise with other analytical data, SI units (μm) were reported instead of Phi units. 6.1.2 Results Samples from each site had fairly similar distributions, indicating that within the sampled depth range there were only minor differences in grainsize distribution. Some surface samples were less sandy than those at depth, indicating more abundant silt and clay at the surface. This is interpreted to be from the draping of older land surfaces by fine-grained material deposited by flood waters. Overall, however the samples were of silty clays to clayey silts, usually with minor sand. This is consistent with deposition by overbank flow during river floods for all geomorphic units including floodplains, levee banks, and channel plugs. Particle size analysis showed a general trend of fining with distance from the main river channel within the Murray River Trench (Figure 10). Soils were generally sandier on the Fm1 unit and more clay-rich on the Terrace unit. The particle size distribution of the Uplands unit is most likely the result of mixing of sediments from a number of sources, including windblown sand from dunes. 90 Sand (%) 80 70 60 50 40 30 20 10 0 0 10 20 30 40 50 60 Clay (%) Fm1 Fm2 Fm3 T U Figure 10. Sand and clay percentage from each geomorphic unit. 16
Page 1 and 2: CRCLEME Cooperative Research Centre
Page 3 and 4: This report (CRC LEME Open File Rep
Page 5 and 6: Lindsay and Wallpolla Creeks are si
Page 7 and 8: TABLE OF CONTENTS _Toc224538156 1 I
Page 9 and 10: List of Tables Table 1. Association
Page 11 and 12: The main objective of the studies r
Page 13 and 14: 4. Identification of the high recha
Page 15 and 16: The SRTM was used as to provide the
Page 17 and 18: Figure 6. Compartmentalisation of t
Page 19 and 20: Dune on terrace Alluvial terrace Yo
Page 21 and 22: Intermediate floodplain Modern floo
Page 23: Locations of sample sites are given
Page 27 and 28: Table 2). Mean pH and EC profiles a
Page 29 and 30: when sampling. This is also reflect
Page 31 and 32: Figure 12. SPOT image of Wallpolla
Page 33 and 34: REFERENCES Bowler, J.M. and Harford
Page 35 and 36: APPENDIX 1. ASTER data and interpre
Page 37 and 38: APPENDIX 2. SPOT Data and interpret
Page 39 and 40: APPENDIX 3. DEM data and interpreta
Page 41 and 42: APPENDIX 4. Gamma-ray data 500000 (
Page 43 and 44: APPENDIX 6. Site Descriptions and D
Page 45 and 46: Site 3 South Settlement road, ~20 m
Page 47 and 48: Site 5 Western end of Keera Road, s
Page 49 and 50: Site 7 Eastern end of Old Mail Rd t
Page 51 and 52: Site 12 Further to west along Old M
Page 53 and 54: Site 14 Dedmens drive, across aband
Page 55 and 56: Site 16 Same area as previous sampl
Page 57 and 58: Site 18 Same location as 17, interm
Page 59 and 60: Site 20 Adjacent to previous site C
Page 61 and 62: Site 22 2 km east of Finnegans brid
Page 64 and 65: APPENDIX 7: Analytical Results Appe
Page 66 and 67: Appendix 7.2: Lindsay-Wallpolla Las
Page 68 and 69: Appendix 7.3: Lindsay-Wallpolla XRF
Page 70 and 71: 16 200709 1929587 20-30 Fm1 7 0.611
Page 72 and 73: Site Number Depth LEME ID Sample #

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