A Method for Determining the Sediment Sources of Rainfall at Watershed Scale

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: 2017-11-14
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A Method for Determining the Sediment Sources of Rainfall at Watershed Scale
  • A Method for Determining the Sediment Sources of Rainfall at Watershed Scale
  • A Method for Determining the Sediment Sources of Rainfall at Watershed Scale

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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 the source of rainfall sediment at the basin scale. In the method, a discriminant analysis method is used to calculate the distance between the sediment source and the sediment in the basin and the distance weight, and the inverse relationship between the distance and the contribution rate is used to calculate the precipitation at the basin scale. Relative contribution rate of rainfall and sediment sources. This method is more reliable than the traditional mixed model, and is less affected by the number of sediment sources. It can study the spatial sediment yield law of each rainfall, calculate the contribution rate of sediment sources with different rainfall intensities, and solve the problem of the mixed model affected by the number of sediment sources. , which avoids false numerical solutions in the calculation results of the mixed model.

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 Patents(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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