Pollution Load Capacity Calculation Study Based on Multi-objective System in Trans-boundary Area, Plain River Network

In this paper, a new method for pollution load control was proposed to solve the transboundary pollution problem in plain river network. The spatial distribution of load capacity, considering both multiple management requirements and local hydrodynamic features, has been studied in three steps: (1) the multiple objectives calculation system featured by multiple constraints has been proposed considering water quality requirements for different kinds of objectives. (2) the corresponding 1-d and 0-d models for load capacity calculation, considering the complex hydrodynamic characteristic, have been established separately. (3) based on the multi-objective calculation system, the load capacity satisfying the multiple objectives in different administrative units could be calculated. The results indicated that pollution load capacity of the whole transboundary area in Taihu basin is 151806 t/y for chemical oxygen demand, 15,099 t/y for ammonia nitrogen and 3394 t/y for total phosphorus, respectively. Then the rationality of the result has been analyzed and the load capacity calculated has been proved reasonable.