Coupling simulation method of flow and sediment process of distributed watershed

A simulation method and distributed technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of not considering the physical mechanism of the water and sediment process, large time and space scales, and large computational load

Active Publication Date: 2017-04-26
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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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.
[0006] At the same time, due to the huge calculati

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  • Coupling simulation method of flow and sediment process of distributed watershed
  • Coupling simulation method of flow and sediment process of distributed watershed
  • Coupling simulation method of flow and sediment process of distributed watershed

Examples

Experimental program
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Example Embodiment

[0080] Example one:

[0081] This embodiment is a distributed water-sediment process coupling simulation method. This embodiment is based on the process-based hydrological simulation, through the system to identify the coupling relationship between topographic features and hydrodynamic features, and establishes soil erosion based on topographic "surface (flaky) erosion-rill erosion-shallow ditch erosion-cut ditch erosion" The chain is the platform, and the soil erosion and sediment transport process simulation method with "thin-layer flow-stream" as the typical hydrodynamic condition. This embodiment first forms the slope surface calculation unit topology and the confluence channel network through the processing of DEM data, and then this is the platform’s measures for hydrometeorology, water and soil conservation (soil and soil conservation forest grass, terraces, horizontal ditch, fish scale pit), land Use and topographic information for processing, input the processed data in...

Example Embodiment

[0165] Embodiment two:

[0166] This embodiment is an improvement of the first embodiment, and is a refinement of the evapotranspiration calculation in the first embodiment. The evapotranspiration calculation described in this embodiment:

[0167] The evapotranspiration in the calculation unit (within the contour zone) includes the evaporation from the wet vegetation leaf surface (vegetation interception water), water area, soil, urban ground surface, urban buildings, etc., as well as the evaporation from the dry leaf surface of the vegetation. The average evapotranspiration model of the calculation unit is calculated using the following formula:

[0168]

[0169] In the formula, FW, FU, FSV, FIR, FNI are the area ratios (%) of water area, impervious area, bare land-vegetation area, irrigated farmland and non-irrigated farmland in the calculation unit respectively; EW, ESV, EU, EIR, ENI is the evapotranspiration or evapotranspiration of the water area, impervious area, bare land-ve...

Example Embodiment

[0207] Example three:

[0208] This embodiment is an improvement of the above embodiment, and is a refinement of the infiltration calculation in the above embodiment. The infiltration calculation described in this embodiment uses the Green-Ampt vertical one-dimensional infiltration model to simulate rainfall infiltration and over-permeability slope runoff, and the general Green-Ampt model for calculation.

[0209] When the infiltration wet front reaches the mth soil layer, the infiltration capacity is calculated by the following formula:

[0210] (twenty four)

[0211] In the formula, f is the infiltration capacity; F is the cumulative infiltration volume; km, Am-1, Bm-1 are described later. The calculation method of the cumulative infiltration amount F varies depending on whether there is accumulated water on the ground surface.

[0212] If the ground surface has continued to accumulate water since the infiltration wet front entered the m-1 soil layer, then the cumulative infiltrat...

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Abstract

The invention relates to a coupling simulation method of a flow and sediment process of a distributed watershed. The method comprises the steps of digital terrain processing, building of a contour strip, building of a contour strip erosion landform data file, data collecting and processing, watershed hydrological process computation, slope erosion and sediment transport process computation, flow and sediment process computation of a channel or a river or a reservoir, judgment, variable parameter transferring, model parameter calibration and model validation, and ending. According to the coupling simulation method, the contour strip is taken as a computing platform for the slope scale, and the real flow and sediment physical process of a slope is taken as a picture, so that the coupling simulation computing capability for rainfall-runoff and erosion-sediment processes of the contour strip slope is achieved; the computational accuracy is ensured on the premise of reducing the computing amount; and the flow and sediment process of the slope with any grid scale is effectively reduced and predicted. Compared with the prior art, the coupling simulation method has the advantages that the terrain adaptability and the scale adaptability are achieved by taking the contour strip as a basic computing unit; meanwhile, deeper recognition of the law of the flow and sediment process of the slope can be achieved on the basis of physical flow and sediment process simulation of the slope and a more complicated practical application is supported.

Description

technical field [0001] The invention relates to a distributed river basin water-sediment process coupling simulation method, is a hydrological sediment process calculation method, and is a hydrological sediment process simulation calculation method using computer technology. Background technique [0002] The water-sediment process of the watershed will ultimately be attributed to the water-sediment process of slopes and rivers. The slope water and sediment process is a complex collection of multiple processes, including rainfall, vegetation canopy interception, surface cover interception, surface runoff, soil infiltration, slope confluence, river channel confluence, and reservoir water processes, while associated processes include raindrops Splash erosion, thin layer water flow erosion, channel water flow erosion, gravity erosion, and sediment transport and deposition processes. [0003] Most of the existing river basin water and sediment process simulations are empirical m...

Claims

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Application Information

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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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