滇池草海水动力特性及牛栏江补水规模适宜性研究

Study on Hydrodynamic Characteristics and Water Diversion Scale from Niulan River to Caohai in Dianchi Lake

滇池草海具有浅水型湖泊的水流特点,风是湖泊水流运动的主驱动力,出入湖水流运动影响相对较弱。为加快草海水体循环与交换,促进草海水质的持续性改善,在研究草海水动力特性的基础上,分析了牛栏江—草海补水的适宜规模。结果表明,牛栏江来水量与湖区水质具有显著的线性关系,当前湖区TP浓度主要受牛栏江来水的影响与控制,TN浓度受入湖水质影响明显。从草海水质改善需求和牛栏江—滇池补水工程综合效益发挥的角度,推荐牛栏江—草海补水工程的适宜规模为3.0m3/s。

As a typical shallow lake of Caohai Lake, wind is the main driving force of lake water and the influence of inflow and outflow river is relatively weak. To accelerate the circulation and exchange and further improve water quality, the suitability scale of water diversion from Niulanjiang River to Caohai Lake was analyzed on the basis of studying the dy- namic characteristics of Caohai Lake. The results show that there is a significant linear correlation between water quality in Caohai Lake and the water diversion from Niulanjiang River. At present, the concentration of TP in Caohai is mainly influenced by water inflow from Niulanjiang River, and the concentration of TN was significantly affected by water quality of inflow. In order to improve water quality of Caohai Lake and play role in comprehensive benefits of water diversion project from Niulanjiang River to Dianchi Lake, it is recommended that the suitable water project scale is 3.0 m3/s.