Experimental and field study on dissipation coefficient of supersaturated total dissolved gas
Experimental and field study on dissipation coefficient of supersaturated total dissolved gas
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DOI：
10.1007/s11771-014-2148-4
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发表时间：
2014-05-01
影响因子：
4.4
通讯作者：
Wang Le-le
中科院分区：
文献类型：
--
作者：
Feng Jing-jie;Li Ran;Wang Le-le
高坝溢流下游总溶解气体（TDG）过饱和度的升高对鱼类产生了大范围的有害影响。一维（1-D）纵向模式是最佳的预测过饱和TDG耗散在很长的距离。该模型的关键问题是耗散系数的准确确定。根据现场观测和试验数据，通过量纲分析和回归，提出了考虑湍流强度、水压力和固液界面影响的过饱和TDG在不同河流和水库中的耗散系数计算公式。公式中的摩阻流速、水深、水力半径和弗劳德数均为自变量，在实际应用中易于确定。采用一维纵向模型计算了金沙江某河段的TDG消能。计算结果与现场实测结果吻合较好，耗散系数和耗散过程均与实测值吻合较好。
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 (1-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.