多介质逸度模型研究鄱阳湖流域p,p’-DDT

The Study on p,p'-DDT in the Drainage Area of Poyang Lake Using Tapl3 Model

以鄱阳湖流域为研究对象,利用TaPL3模型(Version 3.00)计算了该区域p,p’-DDT通过大气和水体的长距离传输潜力(LRTP),同时得出p,p’-DDT在水和大气环境中的持续时间以及在各相间的迁移通量和最终的相间分配结果。结果表明,鄱阳湖中p,p’-DDT通过大气的LRTP为385.6 km^678.7 km,均值为503.3 km,停留时间为1 761 d;通过水体的LRTP为24 395.7 km^184 154.3 km,均值为37 881 km,停留时间为1 173 d。土壤和沉积物相是鄱阳湖流域p,p’-DDT最大的汇,该区域最主要的界面迁移过程是气-植被界面、气-土壤界面、水-沉积物界面的扩散和沉降,植被的吸收、土壤和沉积物中的降解是鄱阳湖流域p,p’-DDT消失的最主要途径。

Taking the drainage area of Poyang Lake as the study area, this study calculated the long - range transport potential （LRTP） of p, p＇ - DDT through air and water in this area with model TaPL3 （Version 3.00）, and further obtained its duration through air and water,transfer flux, the final distribution and degradation ratio in various inter- phases among different mediums, such as air and water. According to the output of the model, the LRTP of p, p＇ - DDT though air in Poyang Lake is 385.6 km - 678.7 km with the mean value of 503.3 km and the retention time of 1 761 days. the LRTP of p,p＇ - DDT though water in Poyang Lake is 24 395.7 km - 184 154.3 km with the mean value of 37 881 km and the retention time of 1 173 days. The results indicated that the biggest bulk sinks of p,p＇ DDT were soil and sediment. Among all transfer processes deposition and diffusion on the air - soil, air - vegetation interfaces, water - sediment interfaces were the primary. The degradation in soil and sediment was the key route for p, p＇ - DDT to disappear in the drainage area of Poyang Lake.