太湖内源释放及营养盐输运研究  

Release and transportation of internal nutrients in Tai Lake

作　　者：王芳[1] 逄勇[1] 韩涛[1] 李一平[1] 

机构地区：[1]河海大学环境科学与工程学院,江苏南京210098

出　　处：《环境污染与防治》2009年第1期21-25,共5页Environmental Pollution & Control

基　　金：国家自然科学基金资助项目(No.50579015);高等学校博士学科点专项科研基金资助课题(No.20070294019);河海大学自然科学基金资助项目(No.2007416611)

摘　　要：从对流—扩散方程出发,通过公式推导,建立了包含底泥污染的水流—水质模型,对模型进行了率定和验证后,应用于太湖。该模型将湖泊水相和内源悬移相污染作为一个整体,结合污染物在悬移泥沙上的各种迁移过程,研究了太湖总氮、总磷内源释放的分布和数量,过程中考虑了悬移泥沙的各种影响因素,得到了较理想的模拟结果,当风速≤3.5m/s时,冲刷和悬移造成的内源污染物释放量较小,内源污染物释放主要通过泥-水界面的静态释放;当风速>3.5m/s时,冲刷和悬移造成的内源污染物释放量随风速增加迅速增大。通过计算得出2001年太湖内源释放的总氮为3.0万t,总磷为0.8万t。Results of domestic and foreign sediment research were utilized in the study of movement of suspended matters in Tai Lake and their release of nutrients. The N-S equations were modified to develop the flow and water quality model for describing the flow field of the lake,the transportation of bottom sediments and other suspended matters,and the amounts of nutrients released from those internal sources. The model was calibrated and verified by the lake flow-field data measured in March 2001. Simulations were then performed for the water and solid phases to study the distribution and quantity of TN and TP of Tai Lake taking into consideration of many factors that affect mass transport of suspended matters and their nutrient ingredients. The simulation results suggest that when the wind speed ≤3.5 m/s,the amount of nutrient release is small due to the slow mass transfer at the stable water-solid interface and that when wind speed〉3.5 m/s,the interfacial mass transfer rate increase substantially due to rapid solid movements and the scouring action at the interfaces. The predicted annual nutrient releases from the internal sources （30 000 t of TN and 8 000 t of TP） are reasonable estimates for controlling eutrophication of Tai Lake.

关 键 词：太湖 悬移物 内源释放 富营养化 对流—扩散方程 

分 类 号：X524[环境科学与工程—环境工程]