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Slope flow and sediment process coupled simulation method

A simulation method and slope technology, applied in special data processing applications, instruments, electrical and digital data processing, etc., can solve the problem of large time and space scale, not considering the physical mechanism of water and sediment process, and difficult to adapt to the needs of soil and water conservation and management, etc. question

Active Publication Date: 2017-04-26
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the above-mentioned empirical method for calculating the water-sediment process does not consider the specific physical mechanism of the water-sediment process, and the time and space scales are large, which is difficult to meet the current needs of regional water and soil conservation management.

Method used

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  • Slope flow and sediment process coupled simulation method
  • Slope flow and sediment process coupled simulation method
  • Slope flow and sediment process coupled simulation method

Examples

Experimental program
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Effect test

Embodiment 1

[0078] This embodiment is a method for coupling simulation of water-sediment processes on slopes. In this example, based on the process-based hydrological simulation, through the systematic identification of the coupling relationship between topographic features and hydrodynamic features, the establishment of soil erosion based on terrain "surface (sheet) erosion - rill erosion - shallow gully erosion - gully erosion" The simulation method of soil erosion and sediment transport process is based on the chain as the platform and the typical hydrodynamic conditions are "thin-layer water flow-stream flow". In this embodiment, firstly, the topological relationship of the slope calculation unit and the confluence channel network are formed by processing the DEM data, and then this is the platform for hydrometeorology, water and soil conservation measures (water and soil conservation forest grass, terraced fields, horizontal ditches, fish scale pits), land Use, terrain and other info...

Embodiment 2

[0132] This embodiment is an improvement of the embodiment, and is a refinement of the calculation of evapotranspiration in the first embodiment. The evapotranspiration calculation described in this embodiment:

[0133] The evapotranspiration in the calculation unit (in the grid) includes the evaporation from the wet leaf surface of the vegetation (vegetation intercepted water), water, soil, urban ground surface, urban buildings, etc., and the transpiration from the dry leaf surface of the vegetation. The average evapotranspiration model of the calculation unit is calculated by the following formula:

[0134] (1)

[0135] In the formula, F W , F U , F SV , F IR , F NI are the area ratios (%) of water area, impermeable water area, bare land-vegetation area, irrigated farmland and non-irrigated farmland in the calculation unit; E W , E SV , E U , E IR , E NI They are the evaporation or evapotranspiration of the water area, impermeable water area, bare lan...

Embodiment 3

[0174] This embodiment is an improvement of the above embodiment, and is a refinement of the above embodiment regarding infiltration calculation. The infiltration calculation described in this embodiment uses the Green-Ampt vertical one-dimensional infiltration model to simulate rainfall infiltration and over-seepage slope runoff, and the general Green-Ampt model for calculation.

[0175] When the infiltration wetting front reaches the m The infiltration capacity of the soil layer is calculated by the following formula:

[0176] (twenty four)

[0177] In the formula, f is the infiltration capacity; F is the cumulative infiltration; k m , A m-1 , B m-1 See below. cumulative infiltration F The calculation method depends on whether there is water on the ground surface.

[0178] If the self-infiltration wetting front enters the first m-1 The surface of the soil has continuously accumulated water since the beginning of the soil layer, then the cumulative infiltratio...

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Abstract

The invention relates to a slope flow and sediment process coupled simulation method. The method comprises the following steps: building a digital slope; building an erosional landform data file; acquiring and processing data; performing a flow and sediment calculation; making a judgment; transmitting variable parameters; calibrating model parameters and performing model verification; and ending. Specific to a mountain slope scale, grating DEM (Dynamic Effect Model) data of different resolutions are taken a platform, and an actual water and sediment physical process of a mountain slope is taken as a view, so that the coupled simulation calculation capability of a slope precipitation-runoff process and an erosion-sediment process is realized; the simulation calculation accuracy is increased; and a slope water and sediment process of any grating scale can be effectively reduced and predicated. Compared with the prior art, the method has the advantages that grating units of a grating DEM are taken as basic calculation units, so that terrain adaptability and scale adaptability are realized. Meanwhile, simulation is performed based on a slope water and sediment physical process, so that the rule of the slope water and sediment process can be known more deeply, and more and more complicated practical applications are supported.

Description

technical field [0001] The invention relates to a coupling simulation method for water-sediment process on slope surface, is a hydrological calculation method, and is a hydrological calculation method using computer technology. Background technique [0002] The water-sediment process on a slope is a complex multi-process collection, including rainfall, vegetation canopy interception, surface cover interception, surface runoff, soil infiltration, and slope confluence, while associated processes include raindrop splash erosion, thin-layer water flow Erosion, channel flow erosion, gravity erosion, and sediment transport and deposition processes. [0003] Most of the existing slope surface water and sediment process simulations are empirical methods, that is, based on the observation data of the soil and water conservation test area, the rainfall, runoff, and sediment process observation data are collected according to different soil and water conservation measures, and after st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 龚家国王浩贾仰文周祖昊刘佳嘉王英牛存稳
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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