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Quantitative evaluation method for water and sand reduction effect of erosion and torrent control work

A quantitative evaluation and evaluation method technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of inaccurate calculation or simulation, affecting the accuracy of calculation or simulation, etc.

Active Publication Date: 2017-05-31
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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  • Abstract
  • Description
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Problems solved by technology

[0005] The problem with the above two methods is that they cannot accurately calculate or simulate the water-sediment process on the slope, thus greatly affecting the accuracy of calculation or simulation

Method used

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  • Quantitative evaluation method for water and sand reduction effect of erosion and torrent control work
  • Quantitative evaluation method for water and sand reduction effect of erosion and torrent control work
  • Quantitative evaluation method for water and sand reduction effect of erosion and torrent control work

Examples

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Embodiment 1

[0084] This embodiment is a quantitative evaluation method for water and sediment reduction benefits of soil and water conservation projects. 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 sc...

Embodiment 2

[0161] 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:

[0162] The evapotranspiration within the calculation unit (grid or contour zone) includes evaporation from the wet leaf surface of the vegetation (vegetation intercepted water), water, soil, urban ground surface, urban buildings, etc., and transpiration from the dry leaf surface of the vegetation . The average evapotranspiration model of the calculation unit is calculated by the following formula:

[0163] (1)

[0164] 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, b...

Embodiment 3

[0203] 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.

[0204] When the infiltration wetting front reaches the m The infiltration capacity of the soil layer is calculated by the following formula:

[0205] (twenty four)

[0206] 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.

[0207] 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 quantitative evaluation method for water and sand reduction effects of erosion and torrent control work. The quantitative evaluation method comprises the following steps: performing digital processing on a terrain; acquiring data of soil and water conservation measures; acquiring and processing other data; calculating water and sand; judging; transmitting variable parameters; performing model parameter calibration and model verification; setting soil and water conservation scenes; generating water and sand process data in different soil and water conservation scenes; analyzing and calculating soil and water conservation effects of the different soil and water conservation scenes; and comparing the effects, and completing the operation. According to the quantitative evaluation method, the data of the soil and water conservation measures of slope surfaces and other hydrological and meteorological data are collected, grid DEM (Dynamic Effect Model) data of different resolutions or contour strip data is adopted as a platform, real water and sand physical process of a hill is adopted as a view, the coupling simulation calculation ability of slope rainfall-runoff and erosion-sand process is achieved, soil and water conservation situations of the slope at different stages are compared and analyzed on premise that the water and sand process is precisely calculated, and thus the effects of the soil and water conservation measures can be very precisely acquired.

Description

technical field [0001] The invention relates to a method for quantitatively evaluating the benefits of water and sediment reduction in soil and water conservation projects, which is a hydrological calculation method, and a hydrological simulation and calculation method using computer technology. Background technique [0002] The methods adopted in the existing studies on the effect of water and soil conservation on hydrology and water resources are "hydrology method" and "soil conservation method". Since neither of these two methods can systematically reveal the physical mechanism of the impact of soil and water conservation on the water cycle, and the water resources assessment caliber adopted. It is only a single water resource in a narrow sense, so that the research results cannot truly reflect the hydrological and water resource effects of soil and water conservation. The distributed hydrological model based on physical mechanism, which takes water resources in the narr...

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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