Method for determining watershed scale individual rainfall sediment sources

A sediment and source technology, applied in measuring devices, material analysis through electromagnetic means, instruments, etc., can solve problems such as the decline in the accuracy of prediction results, and achieve the effect of avoiding false numerical solutions

Inactive Publication Date: 2015-07-15
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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Problems solved by technology

However, the problem with the hybrid model is that when the number of sediment sources increases, the accuracy of its prediction results drops significantly.

Method used

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  • Method for determining watershed scale individual rainfall sediment sources
  • Method for determining watershed scale individual rainfall sediment sources
  • Method for determining watershed scale individual rainfall sediment sources

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Embodiment 1

[0079] In this embodiment, it is assumed that the sediment source area includes agricultural land and forest land. Taking multiple soil samples on agricultural land n 1 , n 2 ... n 5 , multiple samples were collected in the woodland l 1 , l 2 ...l 5 , and the sediment samples at the basin outlet were collected during the rainfall runoff.

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Abstract

The invention discloses a method for determining watershed scale individual rainfall sediment sources. According to the method, the distance between a watershed scale sediment source and sediment and the weight of the distance are calculated by use of a discriminant analysis method, and the relative contribution rate of the watershed scale individual rainfall sediment source is calculated by use of the inverse relation of the distance and the contribution rate. The method is more reliable than a traditional mixed model and can be relatively slightly affected by the number of the sediment sources; the spatial sediment generation law of individual rainfalls can be studied and the contribution rates of the sediment sources different in rainfall intensity can be calculated; as a result, the limitation of the number of the sediment sources to the mixed model can be solved and the false numerical solution of the calculation result of the mixed model can be avoided.

Description

technical field [0001] The invention relates to the technical field of judging the source of sediment in a river basin, in particular to a method for determining the source of sediment in a river basin-scale sub-rainfall. Background technique [0002] Soil erosion has become one of the serious environmental problems in our country. Soil erosion will not only reduce land productivity, but the sediment entering the river will also damage the ecological environment of the river and block the river. At the same time, pollutants usually attach to the surface of the sediment and enter the river with the sediment, causing surface water pollution. Accurately judging the source of sediment and its contribution can provide an important basis for soil and water conservation and water resource management. [0003] The commonly used fingerprinting method can make up for the shortcomings of the current soil erosion models and soil erosion measurement methods in the prediction of large wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/64
Inventor 刘冰曹文洪解刚王向东成晨赵阳周利军殷小琳朱毕生胡健张晓明杨涛
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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