高堆石坝泄洪雾化数学模型研究

Mathematical Model of Flood Discharge Atomization of High Rockfill Dam

运用随机喷溅数学模型,预测了黄河某水电站在无自然风和全年最不利自然风2种情况下3种典型泄洪工况的泄洪雾化影响,得到了降雨强度分布等值线图,可为指导下游边坡防护设计提供参考。根据计算,距离表孔溢洪道出口断面沿河道154~660 m横向左岸2882 m高程以下、右岸2830 m高程以下处于泄洪雾化暴雨区内,该范围内边坡可选择浅层锚喷混凝土保护,设马道和排水沟,提高岸坡安全性和稳定性。当地自然风速较大,对雾化范围影响显著,需要额外重视对左岸的边坡防护。

In this paper,the mathematical model of random splashing was used to predict the impact of flood discharge atomization under three typical flood discharge conditions of a power station in the Yellow River,and also the two conditions of no natural wind and the most unfavorable natural wind throughout the year were considered.The contour map of rainfall intensity distribution was obtained,which could provide a reference for guiding the design of downstream slope protection.According to the calculation,the flood discharge atomization rainstorm area was 154~653 m along the river channel from the outlet section of the surface hole spillway,below the elevation of 2880 m on the left bank and elevation of 2828 m on the right bank.In this area,shallow anchor shotcrete could be used to proted the slope,and set horse path and drainage ditch to improve the safety and stability of the bank slope.Also the local natural wind speed was large,which had a significant impact on the atomization range.Additional attention needed to be paid to slope protection on the left bank.