海拔高程对泄洪雾化影响的敏感分析

Sensitive analysis of the effect of elevation on flood discharge atomization

针对海拔高程对于泄洪雾化降雨分布的影响,提出了一种改进的随机溅水数学模型。运用小湾水电站泄洪洞雾化实测降雨资料进行模型验证,两者结果吻合良好。敏感分析表明,随着海拔高程的增加,泄洪洞下游雾化降雨范围有增大的趋势,当海拔高程从50 m增加到3000 m时,泄洪雾化雨区在两岸的爬升高度增加50 m,纵向范围增大100 m;同时,降雨强度等值线分布发生坦化,在降雨强度大于400 mm/h的等值线区域,分布范围缩小,而在400 mm/h以下区域,雨区分布范围明显增大。上述研究为今后全面考虑海拔高程与气象条件对于泄洪雾化过程的影响建立了基础。

Aiming at the influence of elevation on the rainfall distribution of flood discharge atomization in large hydropower station,an improved stochastic splash model is proposed. The verification of the model were carried out combined with the prototype observation of spillway tunnel operation in Xiao-wan hydropower station,the data obtained by the two methods are in good agreement. Sensitivity analysis of the elevation influence shows that the change of elevation does have an effect on the atomized rainfall downstream of the spillway tunnel. As the elevation increases from 50 m to 3000 m,the climbing height of atomized rainfall area on both banks is increased by 50 m,and the longitudinal range increased by more than 100 m.The contour distribution of rainfall intensity shows a recognizable flattening trend,the distribution ranges of rainfall contours greater than 400 mm/h are decreased,while the ranges of rainfall contours below 400 mm/h are obviously extended. The above research provides a basis for comprehensive considering the influence of meteorological conditions on the whole process of flood discharge atomization in the future.