Water environmental capacity calculation method for tidal water network area

Abstract

The invention discloses a water environmental capacity calculation method for a tidal water network area, and provides the water environmental capacity calculation method for the tidal water network area based on a mathematical statistical analysis method and considering point source and surface source synergistic influence. Aiming at the uncertainty of hydrological water quality parameters such as water flow direction, flow rate, concentration change and the like in the tidal water network area, a non-deterministic medium frequency statistical analysis method is combined with deterministic rainfall runoff, surface source pollution, and a river network hydrological water quality mathematical model, thereby providing the water environmental capacity calculation method based on control of section water quality standards and considering the point source and surface source synergistic influence, and overcoming the defects of the existing river network water environmental capacity calculation method in the aspect of ensuring the assurance rate of control of the section water quality standards.

Description

technical field [0001] The invention relates to a method for calculating the water environment capacity of a tidal water network area, in particular to a method for calculating the water environment capacity based on the water quality of the control section reaching the standard. Background technique [0002] Water environmental capacity is one of the core contents of the total capacity control technology system. It refers to the maximum amount of pollutants that a water body can accommodate under the premise of meeting the water quality standard value corresponding to the water environment function. Pollution ability. At present, scholars have conducted a lot of research on environmental capacity and pollution-holding capacity, and obtained a series of rich research results. Among them, there are relatively many research results on a single river, and their applications are also extensive. However, for tidal water network areas, due to the complexity of water flow, the ti...

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Problems solved by technology

However, for tidal water network areas, due to the complexity of water flow, the time course of pollutant migration, and the uncertainty of spatial distribution, research on the calculation method of water environment capacity is relatively lacking, and its acceptance is low.

In view of the indeterminate flow direction of tidal river networks, most current scholars calculate the corresponding environmental capacity of reciprocating and reciprocating flows on the basis of calculating the time frequency of reciprocating and reciprocating flows in a single channel and the design flow rate, and finally calculate the time of reciprocating and reciprocating flows. The frequency is used as the weight, and the weighted coefficient method is used to calculate the corresponding environmental capacity of the river. Although this type of method takes into account the difference in the environmental capacity corresponding to two different flows, the weighted average cannot consider the guarantee rate of water quality compliance, so as to control regional sewage discharge. It may cause the water quality of the control section to exceed the standard frequently, which deviates from the most basic requirement of environmental capacity for water quality stability (corresponding guarantee rate) to meet the standard

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