Abstract
A mathematical model for simulating hydrodynamics and pollutants migration in a tidal river network was constructed, which takes the temporal and spatial distribution of rainfall runoff and non-point pollutants into consideration. Under the design hydrologic conditions of a typical hydrological year, the daily concentration change process for the control section is obtained. Aiming at the uncertainty of hydrology and water quality parameters such as flow direction, flow rate and concentration change in tidal river network area, a statistical analysis method is used to obtain the maximum allowable concentration of pollutants in the control section under the condition of the water quality standard assurance rate of. Then, a formula for calculating the pollutions emission intensity of point and non-point sources is derived. The method was applied to the pollution source control in a typical region like Taihu in China.
Highlights
The water environmental capacity (WEC) refers to the maximum amount of pollutants that a water body can accommodate under the premise of meeting the water quality standard corresponding to the water environment function
Considering the reciprocating flow in the tidal river network, based on calculation of the time frequency and discharge for reciprocating flow in one river, the environmental capacities for different flow directions are calculated separately. The capacity of this tidal river was calculated by the weighted coefficient method, taking the frequency of the occurrence time of reciprocating flow into consideration [6,7]. This method considers the difference of the environmental capacity corresponding to the two different flow directions, the weighted average cannot consider the probability of the water quality standard, so for pollutants emission control, the water quality may be in compliance of the water standard at high frequency for a specific river or section, which deviates from the most basic requirements for environmental capacity for water quality stability
As parameter for for regional regionalpollution pollutioncontrol, control,water waterenvironmental environmental capacity capacity can be calculated by the formulas for both point sources and non-point sources according to the water can be calculated by the formulas for both point sources and non-point sources according to the water quality standard compliance rate, which can overcome the shortcomings of the existing simplified quality standard compliance rate, which can overcome the shortcomings of the existing simplified algorithms used network environmental capacity calculations
Summary
The water environmental capacity (WEC) refers to the maximum amount of pollutants that a water body can accommodate under the premise of meeting the water quality standard corresponding to the water environment function. Even during periods with relatively stable pollution load, the water quality of tidal river networks shows high temporal variability due to variability in hydrodynamic conditions [3,4,5]. The capacity of this tidal river was calculated by the weighted coefficient method, taking the frequency of the occurrence time of reciprocating flow into consideration [6,7] This method considers the difference of the environmental capacity corresponding to the two different flow directions, the weighted average cannot consider the probability of the water quality standard, so for pollutants emission control, the water quality may be in compliance of the water standard at high frequency for a specific river or section, which deviates from the most basic requirements for environmental capacity for water quality stability (a corresponding guaranteed rate). We obtained the time series matrix reflecting the mathematical response relationship between the pollutant concentration of the control section and the pollutant load of each pollutant source
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