当卡水电站泄水闸下游主河道局部冲刷坑深度计算方法

Computing Method of Downstream Channel Scour Depth of Dangka Hydropower Station Sluice

为准确评价当卡水电站泄水闸下泄水流冲刷形成的局部冲刷坑深度问题,针对泄水闸结构、下泄水流特点及主河道地质条件制作了泄水闸下泄冲刷水工模型并做了试验,根据5种放水工况时泄水闸下泄冲刷时的有关参数,首先选择已有的较为成熟的6个冲刷坑深度计算公式计算了主河道处局部冲刷坑深度,结果发现计算值与实测值相差较大,不能满足实际需要。为此,根据水工模型试验结果,推求出了适合于该处的冲刷坑深度计算公式,与水工模型试验实测数据相比,新推求的局部冲刷坑计算公式计算值与实测值吻合较好。

In order to accurately evaluate the downstream channel scour depth of Dangka hydropower station sluice, a hydraulic model test was conducted which aimed at considering the discharge sluice structure, flow characteristics, and geological conditions of drainage line. Based on the experimental parameters obtained in five different working conditions, six more mature formulas were used to calculate the downstream scour depth. However, the results showed that calculated and measured values were quite different, which could not satisfy the actual requirement. Hence, a more comprehensive and mature calculation formula was deduced to obtain more accurate calculation data, which could be consistent with the experimental data.