水库运用对河流水文情势影响的IHA法评价——以伊河陆浑水库为例

Evaluation for Effect of Reservoir Operation on Hydrological Regime of River Based on IHA Method——Taking Luhun Reservoir in Yihe River for Example

水流是河流生物环境的主要决定因素之一,影响生物群落组成及其多样性。水利工程会改变河流天然径流过程,研究河流的水文情势具有十分重要的意义。基于龙门镇水文站实测流量数据,采用IHA法就陆浑水库运用对伊河径流过程的影响进行了评价。结果表明,陆浑水库的运用对龙门镇水文站水文年极值出现时间变化的影响不大,而对月流量、年极值、频率、延时和变化率指标改变显著,明显改变了下游河道水文情势,对下游河道内的水生态环境产生了较大影响。

The flow regime is recognized as a key factor for determining biological and physical processes and characteristics in a river.But water projects can substantially change the natural flow regimes of water bodies,so the study of the hydrological regime has very important significance.Based on the measured data of flow,the IHA method is used in this paper to evaluate the effect of Luhun Dam on the hydrologic regime of Yihe River by using the historical flow records before and after the building of the dam.The results show that the effect of Luhun Dam on the change in the time of extreme value of the hydrologic year in Longmen Hydrological Station is small,but on the month flow,yearly extreme value,frequency,time delay and the rate of change,there has significant influence,and finally,apparently changing the downstream river＇s hydrological situation and producing the great influence on lower water＇s ecological environment.