Experimental and field study on dissipation coefficient of supersaturated total dissolved gas

作     者：冯镜洁 李然 马倩 王乐乐 

作者机构：State Key Laboratory of Hydraulics and Mountain River Engineering(Sichuan University) 

出 版 物：《Journal of Central South University》 (中南大学学报（英文版）)

年 卷 期：2014年第21卷第5期

页      面：1995-2003页

核心收录：

学科分类：08[工学] 081501[工学-水文学及水资源] 0815[工学-水利工程] 

基　　金：Projects(51179111,51279115)supported by the National Natural Science Foundation of China Project(20110181110073)supported by the Doctoral Programs Foundation of Ministry of Education of China 

主　　题：total dissolved gas dissipation coefficient longitudinal model hydrodynamics 

摘      要：The elevated supersaturation of total dissolved gas （TDG） downstream of a high-dam spill has deleterious effects on fish in a large range. A one-dimensional （l-D） longitudinal model is optimal for the prediction of supersaturated TDG dissipation over a long distance. The key issue of the model is to determine the dissipation coefficient accurately. In agreement with field observations and experiment data, dimensional analysis and regression were performed to propose a formula for estimating the dissipation coefficient of supersaturated TDG in various rivers and reservoirs, and it involves the effects of the turbulence intensity, the hydro-pressure and the solid-liquid interface. The friction velocity, water depth, hydraulic radius and Froude number are independent variables in the formula which are easy to determine in practical applications. The 1-D longitudinal model is implemented to calculate the dissipation of TDG in a reach of the Jinsha River. Good agreement is found between the calculated results and field data for both the dissipation coefficient and the dissipation process.