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River multistage dam system key parameter acquisition method

A technology of key parameters and acquisition methods, applied in general water supply conservation, electrical digital data processing, special data processing applications, etc., can solve water pollution and other problems, achieve the effect of ensuring continuity, increasing the time of degradation and absorption, and promoting settlement

Active Publication Date: 2022-06-03
INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the nutrients (pollutants) in the watershed are still transported to the downstream water body in large quantities and quickly, causing serious water pollution

Method used

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  • River multistage dam system key parameter acquisition method
  • River multistage dam system key parameter acquisition method
  • River multistage dam system key parameter acquisition method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

figure 1 For the flow chart of the method for obtaining the key parameters of the river multi-level dam system according to the present invention, the following will refer to figure 1 , the method for obtaining key parameters of the river multi-level dam system of the present invention is described in detail.

[0022] First, in step 101, a biogeochemical budget model and a pollutant output coefficient model of the pollutants in the watershed are constructed.

[0023] In the embodiment of the present invention, the source small watershed of the drinking water source is selected as the research area, and an independent non-point source pollution model is constructed, including the biogeochemical budget model and the pollutant output coefficient model of the watershed pollutants. Nitrogen and phosphorus budgets in small watersheds include input sources of nitrogen and phosphorus in the watershed (including fertilizer input, atmospheric deposition, nitrogen fixation by crops, and ...

Embodiment 2

[0034] According to the local river rainfall, the maximum daily water volume of the river is obtained, and the key parameters of the multi-level dam system are obtained, that is, the absorption rate of pollutants, the flow velocity of the river, and the residence time.

[0035] Combined with the retention formula, and , to obtain the nutrient retention rate of the river. By changing the hydraulic parameters of the river, such as retention time, we can set the control length and height of the dam according to the expected retention effect.

[0036] According to the formula And set the dam series based on the hydrological conditions of different rivers.

[0037] 1. Test point selection:

[0038] 2. Test results:

[0039] According to the relationship between the interception rate and hydraulic parameters, a 5-level dam was set up in one of the source rivers in the basin. As shown in Table 1, the height of the 5th-level effective dam in this pilot is set to 0.25-1.0m. T...

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Abstract

The invention discloses a method for acquiring key parameters of a river multi-stage dam system. The method comprises the following steps: 1) constructing a biogeochemical income and expenditure model and a pollutant output coefficient model of drainage basin pollutants; 2) acquiring a pollutant river-entering coefficient of the small watershed, and simulating a pollutant river-entering amount of the small watershed; 3) determining the relationship among the river flow, the residence time, the multi-stage dam and the river pollutant rejection rate; 4) according to the initial concentration of non-point source pollution in the river, the predicted concentration after interception and purification and the interception rate of the single-stage dam to pollutants, determining the stage number of dam construction; according to the river multistage dam system key parameter obtaining method, the precision of large-scale watershed non-point source pollution simulation and the precision of watershed non-point source pollution time scale simulation are improved, the river self-purification capacity is enhanced, the water quality of a water body is improved, and the emission requirement of receiving water body pollutants is met.

Description

technical field [0001] The invention relates to the technical field of non-point source pollution control and treatment in small watersheds, in particular to a method for obtaining key parameters of a river multi-level dam system. Background technique [0002] With the development of society and economy, in order to increase crop yield and economic income, small watersheds (source watersheds) are experiencing continuous expansion of agricultural scale, intensification and great changes in agricultural production methods. As a result, the proportion of inputs into production factors such as agriculture and fertilizers has increased, and a large amount of unused fertilizers and pesticides have been lost into rivers through rainfall runoff. In addition, rural domestic sewage, livestock and poultry manure and breeding wastewater have also become important sources of non-point source pollution of water bodies in rural areas in my country. The non-point source pollutants from the...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06F113/08G06F119/14
CPCG06F30/20G06F2113/08G06F2119/14Y02A20/152
Inventor 晏维金张培培王芳
Owner INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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