NUMERICAL STUDY ON ENVIRONMENTAL IMPACTS OF THE THIRD SHANGHAI SEWERAGE PROJECT

作     者：Cheng LIU1, Yun HE2, Joseph Hun-Wei LEE3 and Zhao-Yin WANG4 1 Dr., Asso. Prof., International Research and Training Center on Erosion and Sedimentation, Beijing, 100044, China & Anhui Institu 

作者机构：Dr. Asso. Prof. International Research and Training Center on Erosion and Sedimentation Beijing 100044 China & Anhui Institute of Architecture Hefei 230022 China Lecturer Anhui Institute of Architecture Hefei 230022 China Prof. The University of Hong Kong Hong Kong China Prof. Dept. of Hydraulic Engineering Tsinghua University & International Research and Training Center on Erosion and Sedimentation Beijing 100084 China 

出 版 物：《International Journal of Sediment Research》 (国际泥沙研究(英文版))

年 卷 期：2002年第17卷第2期

页      面：165-173页

学科分类：08[工学] 0815[工学-水利工程] 

基　　金：国家自然科学基金 supported by The Hong Kong Research Grants Council(59890200) 

主　　题：Hydrodynamic simulation Outfall Far field sewage dilution Drogue tracking 

摘      要：Two-dimensional hydrodynamic simulation for the Yangtze Estuary is performed by using the Delft3D model adopting the shallow water equations and the finite volume method on a curvilinear body-fitted grid. The model is calibrated and validated using available tidal data and field measurements. The velocity vector fields, the tidal levels, the trajectories of drogues and the far field sewage dilution from the existing and proposed outfalls are studied for the spring/neap tide and the dry/wet season. The results show that the tidal currents and the runoff flow are able to dilute and disperse the sewage from the outfalls to the outer sea. The sewage dilution contours under various hydrodynamic conditions indicate that the discharged effluent at present have relatively minor impact on the water environment of the Yangtze Estuary; whereas the planned sewage plan would significantly deteriorate the water quality of the estuary in the absence of any treatment, especially during the neap tide of dry season. The drogue tracking shows that the effluent from the four outfalls will be transported downstream to the Hangzhou Bay. A study on the pollution due to the project and the self-purification capacity of Hangzhou Bay is proposed in addition to that of the Yangtze Estuary.