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Evaluation method based on transport diffusion model of soluble pollutants in water environment

A diffusion model, pollutant technology, applied in the direction of instrument, design optimization/simulation, calculation, etc., can solve problems such as limited information, and achieve the effect of improving pertinence and accuracy

Active Publication Date: 2020-06-05
LIREN COLLEGE OF YANSHAN UNIV
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Problems solved by technology

However, only Google Earth remote sensing images are used, and the extracted information is limited

Method used

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  • Evaluation method based on transport diffusion model of soluble pollutants in water environment
  • Evaluation method based on transport diffusion model of soluble pollutants in water environment
  • Evaluation method based on transport diffusion model of soluble pollutants in water environment

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Embodiment Construction

[0108] The present invention will be further described below in conjunction with accompanying drawing:

[0109] Such as figure 1 Shown, method of the present invention comprises the following steps:

[0110] S1, data collection, based on part of the measured data provided by the public sector, consulted literature, and field surveys, using Google Earth remote sensing technology and image processing technology to design basic data extraction methods;

[0111] Using Google Earth remote sensing technology to obtain the surrounding satellite remote sensing map between two adjacent sections of the river, and based on the image processing technology, the remote sensing map is grayscaled, de-dried, filtered and other operations are performed to obtain the binary matrix of the image; Such as image 3 shown.

[0112]

[0113] Among them, f(x i ,x j ) for coordinates (x i ,y j ) The gray value of the pixel point;

[0114] First, threshold debugging and connectivity testing a...

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Abstract

The invention relates to an evaluation method based on a transport diffusion model of soluble pollutants in a water environment. A de Saint-Venant system of equations and a one-dimensional convectivediffusion equation are taken as the basis; branched point connections are set, a one-dimensional river network branch point model is established; the data is discretely converted into a linear equation set through a Preissmann four-point implicit format; based on the thought of a three-level joint solution, a pursuit method is applied to solve the recursion relation of spatial and temporal changesof pollutant concentration, initial and boundary conditions are substituted, unknown numbers are concentrated on a branched point, a hyper-relaxation iteration method is applied to solve the unknownnumbers of the branched point, and then the unknown numbers are substituted into each single direct-current river reach to be solved respectively. Aiming at the condition of insufficient support of generalized section data, the method creatively combines Google Earth remote sensing with an image processing technology, designs a reasonable and feasible data extraction method, obtains basic data, and calculates necessary hydraulic parameters of a river network model through a hydraulic formula; in the aspect of parameter calibration, an improved Bayesian-MCMC method is adopted to calibrate the parameters of the model.

Description

technical field [0001] The invention relates to the field of water environment assessment, in particular to a method for acquiring data of a one-dimensional river network hydrodynamic water quality model and the practical application of the model to specific river areas. Background technique [0002] Reservoirs are important fresh water resources in my country. With the development of social economy and the increase of population, the safety of reservoir resources in our country has brought great pressure, and water pollution emerges in endlessly. The river pollution in the upstream area of ​​the reservoir directly affects the water quality safety of the reservoir area. Therefore, it is of great significance to study the migration and transformation of pollutants in the river network in the upper reaches of the reservoir area, which is of great significance to the daily management of the reservoir and the decision-making and handling of water pollution emergencies. . With t...

Claims

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Application Information

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IPC IPC(8): G06F30/28G06F113/08G06F111/08G06F119/14
CPCY02A20/152
Inventor 张影杨晓东赵秋娜
Owner LIREN COLLEGE OF YANSHAN UNIV
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