基于IHA的黄河源区水文情势及环境流变化

Hydrological Regime and Environmental Flow Change in the Source Region of Yellow River Based on IHA

基于黄河源区唐乃亥及玛曲两个水文站1961—2008年的逐日径流数据,利用IHA软件,从河流水文指标、环境流组成以及生物多样性方面分析了黄河源区水文情势和环境流变化情况。结果表明:(1)受干扰后,唐乃亥及玛曲站分别有17、14个水文指标发生了中度改变,分别占指标总数的53.1%、43.8%;(2)两站环境流中大洪水事件逐渐消失,流量结构组成趋于单一化,并逐步向以高流量脉冲及枯水流量事件为主发展;(3)受干扰后黄河源区生物多样性呈下降趋势,两站的生物多样性指数均值均减少到10。

Based on daily runoff data of Tangnaihai and Maqu hydrological stations from 1961 to 2008,this article analyzed the change in hydrological situation and environment from the aspect of hydrology indicators,environment flow components and biological diversity by using IHA software in the source region of the Yellow River.The results show that a) after the interference,there are 17 and 14 hydrological situation indicators are moderately changed in Tangnaihai and Manqu respectively,accounting for nearly 53.1% and 43.8% of the total number;b) for the environmental flow components of the two stations,flood events are gradually disappear and the structure have a centralized trend and the high pulse and low flow are become mainly event and; c) the biodiversity of the source region of Yellow River is declined and the mean of biodiversity index all reduces to 10.