水利工程对云南省戛旧二水文站影响分析

Analysis on influence of hydraulic engineering on Old(2) Hydrographic Station in Yunnan Province

戛旧(二)水文站是澜沧江干流的重要控制站。上游有曼湾电站,下游有大朝山电站,人类活动影响显著。采用《水文站网规划技术导则》中推荐的评价方法,通过对戛旧(二)水文站实测月平均流量、输沙与还原后月平均流量、输沙对比,经过对水位涨落率、蓄水程度、回水及顶托影响进行分析,判断水利工程建设对戛旧(二)水文站的影响程度。研究结果表明,上下游水利工程建设对戛旧(二)站的水文测验成果影响严重,具体表现为径流影响时段越短,影响越大;水库拦沙作用使得其对泥沙的影响大于对径流量的影响。

The Old (2) Hydrographic Station is an important control station for the main stream of the Lancang River. There are Manwan Power Station in the upper reaches and Dachaoshan Power Station in the lower reaches. And human activities have a significant impact. Using the evaluation method recommended in Guidelines for the Planning of Hydrographic Stations, the average monthly flow, and sand flow after the reduction of the Old (2) Hydrographic Stations are compared. Through the analysis of the water level fluctuation rate, water storage degree, return water and top support effects, the impact of water conservancy project construction on the Old (2) Hydrographic Station is judged. The research results show that the upstream and downstream water Conservancy projects have a serious impact on the hydrological test results of the Old (2) Station. The effect of reservoir sand blocking on sediment is greater than that on runoff.