摘要
湖流对湖泊形态发挥巨大作用,是一个重要的动力学指标,它影响着湖中的热量、溶解质、营养元素、各类污染物质的迁移和扩散,另一方面对人类活动包括航运、渔类捕捞养殖、水底工程等也会造成影响。通过构建基于EFDC模型的鄱阳湖二维水动力模型,在按照枢纽拟定的调度方案下,对典型年份丰、平、枯3种年型的湖流进行有枢纽与无枢纽状态下的比较。模拟结果表明:水利枢纽工程水位调度方案根据季节性对水位进行调节,会使湖泊的基本湖流特征发生改变。倒灌型湖流和顶托型湖流会由枢纽水位调节而产生的蓄水和排水湖流格局取代;另外,在蓄水过程中,会出现产生回流型湖流。水利枢纽的水位调节方案同样会对鄱阳湖的局部流场产生影响,尤其在枯水年型下,影响程度更大。水利枢纽会使松门山南部的顺时针环流场和汉池湖附近的回流场出现的次数减少;同时反时针半环流场出现的次数在主湖区的局部回流场和汉池湖附近的有所增加,反时针环流场在松门山南部次数也增加。
The lake flow plays an important role in the form of lakes.It is an important dynamic indicator.It affects the heat,dissolved matter,nutrients and migration and diffusion of various pollutants in the lake.On the other hand,human activities include shipping and fishing.Water foundation projects,etc.will also have an impact.In this paper,by constructing the two-dimensional hydrodynamic model of Poyang Lake based on EFDC model,under the scheduling scheme of the hub,the lake flows of the typical years of Feng,Ping and Kus are compared in a hubless and non-junction state.The simulation results show that the water level scheduling scheme of the water conservancy project will adjust the water level according to the seasonality,which will change the basic lake flow characteristics of the lake.The inverted irrigation lake and the top-mounted lake flow will be replaced by the water storage and drainage lake flow pattern generated by the adjustment of the water level of the hub;in addition,during the water storage process,the return flow type lake will occur.The water level adjustment scheme of the water conservancy project will also affect the local flow field of Poyang Lake,especially under the dry year type.The water conservancy hub will reduce the number of occurrences of the clockwise circulation field in the southern part of Songmen Mountain and the return field near Hanchi Lake.At the same time,the number of counter-clockwise half-ring flow fields appears in the main lake area and Hanchi Lake.The number has increased in the vicinity,and the number of counterclockwise circulation fields has increased in the southern part of Songmen Mountain.
作者
李芳芳
潘思怡
赖格英
吴青
LI Fangfang;PAN Siying;LAI Geying;WU Qing(School of Geography and Environment,Jiangxi Normal University,330022,Nanchang,PRC;Key Laboratory of Poyang Lake Wetland and Watershed Research,330022,Nanchang,PRC)
出处
《江西科学》
2019年第1期90-97,115,共9页
Jiangxi Science
基金
国家自然科学基金项目(41561101)
江西省重大生态安全问题监控协同创新中心项目(JXS-EW-00)
