摘要
沉积物释放是水体磷污染的重要来源之一.鉴于一般水质模型对沉积物释放项的模拟过于简单,无法充分体现实际河道污染物迁移转化等情况.本研究通过静态和动态相结合的室内沉积物释放模拟实验探讨不同水动力条件下磷释放规律,以此修正现有的水质模型,使沉积物在不同水动力条件下的释放项对河道水质的影响在模型中得到体现,并将其应用于太湖苕溪入湖口的水质模拟中.研究结果表明,在不同水动力条件下,沉积物释放速率与流速呈现指数增长关系.而采用动态底泥释放修正后的水质模拟效果要比采用模型默认值的水质模拟效果好,从而验证了改进模型的合理性,也表明水动力对沉积物释放的影响是水质模拟中不可忽略的因素.
Sediment derived phosphorus （P） is an important P source in waters.Simulation on the release of sediment P involved in most water quality models is oversimplified or lack of information, therefore couldn＇t effectively reflect the removal and transformation of the contaminants. In this study, a modified WASP model is developed to simulate the water quality in Tiaoxi estuary of Taihu Lake. The modification was based on sediment release dynamics under different hydraulic conditions. Results show that release rate of sediment P increased exponentially with the increase of flow velocity. Simulation results from our modified model are more accurate than the original model with default set. This study also suggests that much more attention should be paid to the release of sediment P in the simulation of water quality in the estuary.
出处
《环境科学学报》
CAS
CSCD
北大核心
2013年第12期3301-3308,共8页
Acta Scientiae Circumstantiae
基金
浙江省环保厅科研计划项目(No.2011B11)~~
