湖水-沉积物界面内源物质交换动态复水模拟研究  

Dynamic simulation study on inner source nutrient exchange between water-sediment interfaces in the Xuanwu Lake

作　　者：薛联青[1] 吕锡武[1] 吴磊[1] 

机构地区：[1]东南大学土木工程学院

出　　处：《水科学进展》2004年第2期189-192,共4页Advances in Water Science

基　　金：国家自然科学基金资助项目(50239030);河海大学科技创新基金资助项目(2003411143)~~

摘　　要：分布式采集了玄武湖底长期暴露的底泥,分析了底泥营养物的分层分布及其理化特性对湖泊水质的影响强度。通过动态换水试验,研究了复水过程中暴露底泥营养盐的释放过程和上覆水总磷、总氮浓度变化对水 土界面物质交换的作用关系以及对水体富营养化程度的影响机制。实验及模拟表明:由于湖泥表层长期暴露,有机及结合态营养盐降解为无机态营养盐,即使复水过程中使用清水,但由于干涸湖床沉积物总磷T P、总氮T N的垂直分布,也将严重导致内源营养盐释放总量持续增加,在相对长时间内,上覆水总磷浓度仍维持在较高(0 1mg/L)水平。研究成果为实施生态修复,治理复水后湖体富营养化提供了理论和实验依据。The distributed sediment samples in the Xuanwu Lake were collected to analyze the influence on the water quality of nutrient layer distribution condition in sediments and its physical and chemical characteristics. Through the dynamic water exchange experiments,we estimate and model quantitatively the releasing process of nutrient from the sediments, the influence mechanism of consequent concentration variation of T-P and T-N in above water to the interfacial material exchange correlation of the Xuanwu Lake eutrophication. The research results show that even if the pure water is used to exchange the polluted water in the lake, after a long time exposure of surface layer sediment, a great deal of organic and integrated nutrients would degrade into inorganic nutrient. In the early exchanging of lake water the released T-P and T-N increase continually acting as the service to inter pollution sources. This is mainly owing to the vertical distribution of T-P and T-N in the bed sediment collected during the dry period of the Xuanwu Lake. In the long run, the concentration of T-P in the above water will maintain at a high level of 0.1mg/L. The above research results provide theoretical and practical basis for relevant ecological restoration project.

关 键 词：湖泊 水土界面 营养盐释放 内源物质交换 动态模拟 磷 

分 类 号：X524[环境科学与工程—环境工程]