A simulation method for river basin sediment traceability based on caesar-lisflood model

Abstract

A simulation method for river basin sediment traceability based on CAESAR-Lisflood model, including: S1, determining the slope angle threshold of landslide instability in the watershed; S2, establishing the spatial distribution file of the slope angle threshold of landslide instability in the watershed; S3, establishing two-dimensional material sources Index matrix; S4, based on the CAESAR‑Lisflood model, establish a four-dimensional array variable strata[xyindex; z; n, T] representing the surface active stratigraphic system and a three-dimensional array variable grain[xyindex; n, T] representing the composition of sediment particle size , where, xyindex represents the position index, z stores the stratum index; n stores the index corresponding to the range of sediment particle size, T represents the tracking index value, the value range is 1‑m, m is a natural number greater than 1; and S5, using CAESAR‑Lisflood The model simulates and traces the material migration process in different material source regions.

Description

technical field [0001] The invention relates to the technical field of surface (geomorphology) numerical simulation, in particular to a simulation method for river basin sediment traceability based on a CAESAR-Lisflood model. Background technique [0002] At present, various numerical simulations and physical models are used at home and abroad to simulate the earth's surface (landform evolution) system, and the simulation research on the migration of watershed materials and changes in river channels has developed into a new research hotspot. For example, soil erosion prediction models are used to study soil erosion, such as the Universal Soil Loss Equation (USLE) and the WEEP soil erosion model. With the development of geographic information system (GIS) and remote sensing technology, more research attempts to apply digital elevation model (DEM) to the study of soil erosion types and processes, and apply GIS system to establish quantitative calculation methods of soil erosio...

AI Technical Summary

Problems solved by technology

For example, most of the results of common surface (geomorphology) evolution models can only output the total sediment yield of the watershed, and cannot separately track and simulate landslide sediment yield and its subsequent migration process, that is, it is impossible to distinguish landslide sediment yield from non-landslide sediment yield to open

In addition, although the existing surface (geomorphology) evolution models can simulate the evolution of watersheds at different spatio-temporal scales under different scenarios, and can predict the total sediment production and surface elevation changes under specific scenarios in a watershed, they are not suitable for extreme disaster scenarios (such as landslides). There are still deficiencies in the simulation of the material production and migration process under the

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