中层温差反坡异重流运动特性试验研究  

Motion Characteristics of Mid-layer Adverse Slope Density Current in the Presence of Temperature Difference

作　　者：纪道斌[1] 曹巧丽 谢涛[1] 尹卫平[1] 黄钰铃[1] 刘德富[3,4] 

机构地区：[1]三峡大学水利与环境学院,湖北宜昌443002 [2]贵州省水利水电勘测设计研究院,贵阳550000 [3]三峡大学三峡库区生态环境教育部工程研究中心,湖北宜昌443002 [4]湖北工业大学资源与环境学院,武汉430000

出　　处：《长江科学院院报》2013年第4期34-39,43,共7页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金面上项目(51179095;51179205);国家自然科学基金青年基金项目(51009080;51009081;51209123)

摘　　要：以三峡水库支流库湾长期普遍存在的中层倒灌异重流为背景,构建室内物理模型,以入流量、初始水位、温度差3个主要影响因子,设计系列工况对中层反坡异重流运行特性进行模拟试验研究,分析异重流头部移动速度、交界面高度、头部厚度等主要水力学要素的变化过程及受入流量、初始水位、温度差的影响规律。借助钱宁等有关异重流的头部速度理论公式,计算了各种工况下的中层异重流头部理论速度,对比实际头部速度的实测值与理论值,两者相差不大,相对误差均小于5%。With the widespread long-term mid-layer intrusion density flow in the tributary bays of Three Gorges Res- ervoir as a research background, an indoor physical model was built. Three main factors： inflow rate, initial water level, and temperature difference were chosen to design various conditions to simulate and investigate the motion characteristics of adverse slope density current in the mid-layer. The variations of hydraulic elements of the density current such as head moving velocity, interface height and head thickness influenced by inflow rate, initial water level, and temperature difference were analyzed. With Channing＇ s theoretical formulas, the head velocities of mid- layer density current in different conditions were calculated and compared with the measured values. It was found that the difference between the two was not large, and the relative error was less than 5%.

关 键 词：温差 中层 反坡异重流 试验 

分 类 号：TV145.23[水利工程—水力学及河流动力学]