首页|Precise Emission Reduction of Total Nitrogen for Jurisdictions in Laizhou Bay,China:A Simulation-Optimization Approach Linking Land-Sea Management
Precise Emission Reduction of Total Nitrogen for Jurisdictions in Laizhou Bay,China:A Simulation-Optimization Approach Linking Land-Sea Management
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This study aims to provide a quantitative basis for the precision emission reduction of land-based total nitrogen(TN)pollutants in Laizhou Bay(LZB),China.The total maximum allocated load(TMAL)of TN pollutants within jurisdictions around LZB was calculated using the stepwise simulation-optimization model after the division of source units,simulation of the concentra-tion response matrix,setting of the additional constraint conditions for stepwise source units,and calculation of TMAL.The load reduction allocation system for jurisdictions can be constructed on the basis of the TMAL and the load monitored or statistics.The index system for TN emission reduction included indices for two groups:a fixed index of marine emission reduction rate for jurisdic-tions,which was 11.93%on average;and threshold indices of pollution prevention rate at sources,the increment rate of pollution removal by municipal sewage treatment systems,and watershed retention of jurisdictions,which were 7.43%,1.58%,and 1.09%on average,respectively.Efficiency of pollutant reduction can be evaluated using a 3D hydrodynamic-water quality model.Simulation results showed that the precise reduction indicators achieved the seawater quality improvement target of LZB 5 years earlier than the equal proportion reduction indicators currently used in LZB Basin.
Laizhou Bayland-based total nitrogentotal maximum allocated loadland-sea management
WANG Yan、ZHONG Shimin、SU Ying、SUN Mingdong、WENG Qiaoran、XU Xiangqin、LEI Kun
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Key Laboratory of Estuarine and Coastal Environment,Chinese Research Academy of Environmental Sciences,Beijing 100012,China
China National Offshore Oil Corporation,Beijing 100010,China
School of Ocean Science and Technology,Dalian University of Technology,Panjin 124221,China
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