Multi-scale non-point source pollutant river entry coefficient measuring and calculating method based on runoff path

A pollutant and multi-scale technology, applied in the field of river basin water resources and water environment, can solve problems such as high cost of manpower and material resources, difficult to promote, etc.

Active Publication Date: 2021-09-07
INNOVATION ACAD FOR PRECISION MEASUREMENT SCI & TECH CAS
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Problems solved by technology

The manpower and material cost of the actual measurement method is relatively large, and it is only suitable for small watersheds with simple pollution sources and clear catchment paths, and it is difficult to popularize in a large scale

Method used

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  • Multi-scale non-point source pollutant river entry coefficient measuring and calculating method based on runoff path
  • Multi-scale non-point source pollutant river entry coefficient measuring and calculating method based on runoff path
  • Multi-scale non-point source pollutant river entry coefficient measuring and calculating method based on runoff path

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Embodiment 1

[0107] see figure 1 , a method for measuring and calculating the river-flow coefficient of multi-scale non-point source pollutants based on the runoff path. In this embodiment, the Han River Basin is selected as the research object, and the following steps are followed in turn:

[0108] 1. Acquire the basic geographic data of the watershed, including: digital elevation model DEM with a spatial resolution of 94 meters, water system data, land use data, soil type data, and time series of daily rainfall data covering 23 national basic meteorological stations from 2012 to 2014 ;

[0109] 2. After comprehensively considering the spatial resolution of DEM data and the size of typical land use plots that can be independently monitored, the size of the plot scale calculation unit is determined to be 94 meters. The upper and middle reaches of the Han River Basin are dominated by hills and mountains, and the lower reaches are mainly plains , after reducing the DEM value of the grid whe...

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Abstract

A multi-scale non-point source pollutant river entry coefficient measuring and calculating method based on runoff paths comprises the steps: firstly, determining grid plots, sub-basins and calculation units of the basins according to basic geographic data of the basins, and recognizing the runoff paths from the grid plots to outlets of the sub-basins in the basins; then, calculating the occurrence probability of three typical rainfall events of medium and light rain, heavy rain and rainstorm, and obtaining the average surface runoff pollutant concentration and the average pollutant interception rate of typical land utilization plots in a drainage basin under the three typical rainfall events; then determining the average surface runoff depth of each grid plot in the drainage basin under the three typical rainfall events and the migration time of the surface runoff flowing through each grid plot, and then calculating the non-point source pollution generation amount and the river entering amount of each grid plot under the three typical rainfall events; finally, sequentially determining the non-point source pollutant river entry coefficients of each grid plot, each sub-drainage basin and the drainage basin. According to the design, the non-point source pollutant river entry coefficients are accurately and efficiently determined.

Description

technical field [0001] The invention belongs to the technical field of river basin water resources and water environment, and relates to a method for measuring and calculating the coefficient of non-point source pollutants entering rivers, in particular to a method for measuring and calculating the coefficient of non-point source pollutants entering rivers based on runoff paths. Background technique [0002] Pollutants that cause deterioration of the water environment can be divided into point source pollution and non-point source pollution according to their sources. With the large-scale collection and treatment of industrial wastewater and urban domestic sewage, point source pollution has gradually been effectively controlled, and non-point source pollution driven by rainfall runoff has become the focus and difficulty of improving water environment quality. Based on the monitoring and investigation work of a large number of pollution sources in my country's pollution censu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06Q10/06G06Q50/06G06Q50/26G06F111/08G06F113/08
CPCG06F30/20G06Q10/0639G06Q50/06G06Q50/26G06F2111/08G06F2113/08Y02A20/152
Inventor 李思思张亮刘宏斌庄艳华杜耘夏必青
Owner INNOVATION ACAD FOR PRECISION MEASUREMENT SCI & TECH CAS
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