龙羊峡水库建库前后水文设计成果对比

Comparison of Hydrological Design Results before and after Longyangxia Reservoir Construction

为掌握观测序列延长后的龙羊峡水库水文设计成果的变化情况,通过采用黄河上游流域实测的101年的径流观测资料、75年的洪水观测资料,运用皮尔逊Ⅲ型曲线对龙羊峡水库设计年径流、设计洪峰与设计洪量进行了分析计算。结果表明:采用延长资料的水库设计年径流与原始设计成果相差不超过2%;重现期在1000年一遇及以上洪水的设计洪峰、设计洪量相对下降变幅在5%以内;重现期在50年一遇及以下洪水的设计洪峰、设计洪量相对增加幅度在3%以内。通过计算,明确了龙羊峡水库建库30年后的水文设计成果。

In order to grasp the change of hydrological design results of Longyangxia Reservoir after the extension of observation sequence,the runoff observation data of 101 years and the flood observation data of 75 years in the upper reaches of the Yellow River Basin were used to analyze and calculate the design annual runoff,design flood peak and design flood volume of Longyangxia Reservoir by using PearsonⅢcurve.The results show that the difference between the designed annual runoff of the reservoir using the extended data and the original design results is not more than 2%;the design flood peak and design flood volume of the floods with recurrence interval of 1000 years and above decrease within 5%;the design flood peak and design flood volume of the floods with recurrence interval of 50 years increased by less than 3%.Through calculation,the hydrological design results of Longyangxia Reservoir after 30 years of construction are clarified.