Rainfall sediment transport model construction method suitable for multi-landform type region

Abstract

The invention provides a rainfall sediment transport model construction method suitable for multiple landform type areas, and the method comprises the steps: analyzing rainfall characteristic indexes and subarea sediment transport of different landform type areas of a watershed according to rainfall data of a rainfall station of the watershed, actually measured sediment transport data of a hydrometric station and area data of the different landform type areas; adopting a non-parametric statistical test method to analyze the modeling representative time period, obtaining an analysis result, constructing single-index rainfall sediment transport models of different landform type areas according to the analysis result, the rainfall characteristic indexes of the different landform type areas of the watershed and the subarea sediment transport amount, analyzing, judging and screening the effective rainfall indexes, constructing a partition multi-index rainfall sediment transport model based on the screened effective rainfall indexes, carrying out quantitative constraint on a value range of parameters in the partition multi-index rainfall sediment transport model to obtain a partition optimal model, calculating the sediment transport amount of the whole watershed by adopting the partition optimal model, and analyzing the rationality of the partition optimal model according to the sediment transport amount of the whole watershed. Operation is easy, and results are reliable.

Description

technical field [0001] The invention relates to the technical field of engineering sediment, in particular to a method for constructing a rainfall and sediment transport model suitable for multi-geomorphic type areas. Background technique [0002] Sediment yield in a watershed is the product of the combination of rainfall and underlying surface. Regardless of the underlying surface or rainfall, once changes occur, different amounts of sand will be produced. When analyzing the reasons for the change of sediment yield in the watershed, it is necessary to analyze the sediment yield of the natural underlying surface that is less affected by human activities. When demonstrating new reservoirs, check dams and other projects, it is necessary to analyze the sediment yield of the underlying surface of the current watershed. When analyzing the sediment yield of different underlying surfaces, it is generally necessary to analyze the modeling period and build a rainfall and sediment tra...

AI Technical Summary

Problems solved by technology

For a watershed that contains multiple landform types, if the difference in landform types is not considered when calculating the sediment yield, and only one rainfall-sediment transport model is used for calculation, the calculation result of the sediment yield will inevitably be too large or too small

When determining the modeling period, due to the complexity of the water-sediment relationship, the mutation point obtained by the commonly

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