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DEM-based dynamic basin sediment yield simulation method

A simulation method and dynamic technology, applied in the field of DEM-based dynamic river basin sediment yield simulation, can solve the problems that cannot reflect the unique erosion characteristics, have not been developed, and lack evaluation models for water and soil loss

Pending Publication Date: 2022-01-04
HOHAI UNIV +1
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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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  • DEM-based dynamic basin sediment yield simulation method
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  • DEM-based dynamic basin sediment yield simulation method

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Embodiment 1

[0125] The loess gully area has high density of main gullies, broken terrain, sparse vegetation, loose soil, heavy rainfall and serious erosion. The main landforms of the loess gully area can be summarized into two types: valley land and gully land. Due to the strong slope cutting, broken terrain, vertical and horizontal gullies, and long-term irrational land use, the vegetation is scarce, the heavy rain is concentrated and strong, and the soil erosion is extremely serious. The soil erosion modulus is mostly 10,000 t / (km2 Above a) and up to 30,000 t / (km2·a) in some areas, which is the main source of coarse sediment in the Yellow River. This application selects the Chabagou watershed, a typical small watershed with relatively complete observation data in this area, to study the erosion and sediment yield model. The slope of the loess gully area is very steep, so that the flood wave propagates quickly, and the flatness along the course is small, which has the propagation charac...

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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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/05
CPCG06T17/05G06T2210/24Y02A90/10
Inventor 王加虎李丽冯艳陈理想李名左海阳周炫孙阳刘金锋牛立强
Owner HOHAI UNIV
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