Drainage basin sediment traceability simulation method based on CAESAR-Lisflood model

Abstract

The invention discloses a drainage basin sediment traceability simulation method based on a CAESAR-Lisflood model. The method comprises the following steps: S1, determining a landslide instability slope angle threshold value of a drainage basin; S2, establishing a drainage basin landslide instability slope angle threshold spatial distribution file; S3, establishing a two-dimensional material source index matrix; S4, on the basis of a CAESAR-Lisflood model, establishing a four-dimensional array variable strata[xyindex; z; n, T] and a three-dimensional array variable grain[xyindex; n, T], wherein the xyindex represents a position index, z stores a stratum index, n stores a corresponding sediment particle size range index, T represents a tracking index value, the value range is 1-m, and m is a natural number greater than 1; and S5, utilizing the CAESAR-Lisflood model to simulate and trace the migration process of substances in different substance source areas.

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...

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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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