基于三门峡水库反馈效应的古贤水库调控指标分析

Analysis on regulation index of the Guxian Reservoir based on feedback effect of the Sanmenxia Reservoir

调水调沙是协调黄河水沙关系的重要途径之一。在对黄河潼关站1974-2017年汛期日均洪峰流量超过1 500 m^3/s的162场场次洪水进行系统分析的基础上,筛选出82场以龙门来水为主的非漫滩洪水作为古贤水库调水调沙期近似下泄的水沙过程。通过对场次洪水在三门峡水库的沿程冲淤调整分析,从有利于三门峡库区河段冲刷、潼关高程降低和洪水冲刷效率等多方面综合考虑,提出调水调沙期间古贤水库适宜下泄的流量和含沙量等水沙调控指标为:洪峰流量2 000~4 000 m^3/s,且在小北干流河段不漫滩,含沙量低于30 kg/m^3,持续时间3~10天。

Based on analysis of 162 secondary floods with average daily flood peak discharges exceeded1 500 m^3/s in the flood season at the Tongguan Station of the Yellow River between 1974 and 2017.Non-floodplain floods with the Longmen Station inflow as the approximate discharge processes of the Guxian Reservoir during the water and sediment regulation period were studied.Based on the analysis of the regulation of site flood and sediment deposition along the course of the Sanmenxia Reservoir,the suitable discharge and sediment concentration of Guxian Reservoir during water and sediment regulation are suggested.The suggested peak discharges are between 2 000 m^3/s and 4 000 m^3/s,and there is no flood plain in Xiaobei Main Stream.Sediment concentration is less than 30 kg/m^3,and lasting for 3~10 days.