中文摘要：

针对传统异重流观测方法不利于对异重流进行实时追踪的问题，基于浊度型清浑水交界面的概念，提出浊度型清浑水交界面识别方法，并将其应用于紫坪铺水库汛期浑水异重流观测。该方法利用浊度值突变能判定异重流交界面位置，利用浊度型清浑水交界面描述异重流前锋厚度和浓度外边界线，并将异重流交界面位置确定在1．2～3．5m厚的水层内，同时还分析了地形变化对异重流运动规律的影响。异重流原型观测结果表明，浊度型清浑水交界面识别方法可以作为水库汛期监测异重流的有效手段。

英文摘要：

The turbidity currents are observed in traditional methods which aren＇ t suitable for the real-time observation. Therefore, based on the concept of the turbidity-interface between turbid water and clear water, this paper proposes an interface identification method that can be applied in the field observation of turbidity currents at reservoir during floods. By analyzing the sudden change in water turbidity, this method can locate the position of the interface within a water layer thick of about 1.2 m to 3.5 m. Then the front thickness and outer boundary of transition region can be illustrated by using the concept of the interface proposed in the present paper. In addition, the paper also analyzed the impact on the performances of turbidity currents caused by topography variation. On all accounts, the results show that the method is effective for monitoring the turbidity currents at reservoir during the floods.