彭水-沙沱区间流量与面雨量关系研究

Study on the Relationship Between Discharge and Area Rainfall in Pengshui-Shatuo Section

对彭水-沙沱区间流量与面雨量变化关系进行分析,结果显示彭水-沙沱月均区间流量与月均面雨量呈显著的正相关;洪水期逐时最大区间流量与逐时最大面雨量出现的平均时间差不超过24 h;非汛期降水区间产汇流时间比汛期略有增加。采用前一日区间流量、当日面雨量等预报因子建立分月的彭水-沙沱日均区间流量预报模型,结合已知的沙沱电站出库流量数据,对彭水水电站入库流量预测有直观参考作用,在电站防洪和发电安排工作上有一定的应用前景。

The relationship between discharge and area rainfall in Pengshui Shatuo section is analyzed.The results show that there is a significant positive correlation between the monthly average discharge and the monthly average area rainfall in Pengshui-Shatuo.The average time difference between the hourly maximum interval flow and the hourly maximum areal rainfall during the flood period does not exceed 24 h.The time of runoff generation and concentration in precipitation interval in non flood season is slightly higher than that in flood season.A monthly Pengshui Shatuo daily average interval flow prediction model is established by using the prediction factors such as the interval flow of the previous day and the area rainfall of the current day.Combined with the known outflow data of the Shatuo Power Station,it has an intuitive reference for the prediction of the inbound flow of the Pengshui Hydropower Station,and it has certain application prospects in the flood control and power generation arrangements of the power station.