Multi-parameter fingerprinting of sediment deposition in a small gullied catchment in SE Australia

被引:99
作者
Krause, AK
Franks, SW
Kalma, JD [1 ]
Loughran, RJ
Rowan, JS
机构
[1] Univ Newcastle, Sch English, Discipline Civil Surveying & Environm Engn, Callaghan, NSW 2308, Australia
[2] Univ Newcastle, Sch Environm & Life Sci, Discipline Geog & Environm Sci, Callaghan, NSW 2308, Australia
[3] Univ Dundee, Fac Arts & Social Sci, Dept Geog, Dundee DD1 4HN, Scotland
关键词
soil erosion; sediment sourcing; fingerprinting; mixing model;
D O I
10.1016/S0341-8162(03)00085-7
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The determination of relative contributions of potential sediment sources is an important step in the development of management strategies to combat soil erosion. In a 1.2 km(2) gullied catchment in southeastern New South Wales, multi-parameter fingerprinting of sediment deposited in successive downstream pools has identified gully walls as the dominant sediment source when the grazed pasture surface was the only other potential source. The median fractional contributions remained relatively steady in the successive downstream pools, with the gully walls responsible for between 90% and 98% of the pool sediment. This result was achieved despite the ratio of the source areas varying considerably between successive nested subareas. Reliability bounds on the predictions, accounting for limited sampling of sources, were well constrained and varied between 5.4% and 13.8%. Downstream of an unsealed road crossing, sediment from the road source dominated the pool sediments such that contributions from the pasture surface and gully sources could not be determined. (C) 2003 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:327 / 348
页数:22
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