DEM-based dynamic basin sediment yield simulation method

Abstract

The invention discloses a dynamic drainage basin sediment yield simulation method based on a DEM, and relates to the technical field of water and soil loss analys.The loess gully area is divided into three vertical distribution units including a ridge and loess slope area, a valley slope area and a trench area according to the terrain by obtaining terrain data and rainfall data of the loess gully area; a distributed runoff movement numerical model based on DEM grids is established by adopting a slope flow movement wave equation, the runoff depth, the flow velocity and the flow of each grid at any moment in the loess gully area drainage basin are calculated, the runoff and sediment yield is deduced according to a mechanical concept, and the simulation work of the dynamic drainage basin sediment yield is completed.

Description

technical field [0001] The invention relates to the technical field of water and soil loss analysis, in particular to a DEM-based method for simulating sediment yield in dynamic river basins. Background technique [0002] In recent years, while concentrating manpower and material resources on the development of empirical models for erosion prediction, countries around the world have paid attention to the research on the physical process of erosion and sediment production and its physical models, and have achieved a large number of innovative research results, and successively developed the general soil loss equation ( USLE), Revised Universal Soil Loss Equation (RUSLE), Runoff and Sedimentation Prediction Model (WEPP), Dutch Model (LISEM), European Runoff and Sedimentation Prediction Model (EROSEM), etc. However, since foreign physical process models (WEPP, LISEM, EROSEM) are mostly developed and applied in plain areas, they lack the verification of observational data in my ...

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Problems solved by technology

[0004] After the 1990s, with the development of 3S technology, attention was paid to the development of distributed water and sediment models. Researchers took the Heicao River small watershed as an object and established a distributed model of small watershed erosion and sediment production based on heavy rain events. The model can be The spatio-temporal distribution process of flow-confluence and erosion-sediment production in any grid unit is calculated, but the model is not developed for the topography of the hilly area, so it cannot reflect the unique erosion characteristics of the hilly slope, gully slope, and trench in the hilly area. Therefore, it cannot be applied to the prediction and evaluation of soil erosion and sediment yield in loess gully areas

[0005] Following social development, it is imminent to strengthen the governance of loess hilly and gully areas, but there is still a lack of an effective soil erosion evaluation model suitable for loess hilly and gully areas in the planning, design and management of watershed governance in loess hilly and gully areas

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