【摘要】 采用Mann-Kendall检验法对嫩江流域同盟(二)站年均流量进行突变性检验,采用RVA方法从河流水文情势指标和生态多样性指标两方面分析尼尔基水利枢纽运行对下游河流水文情势的影响。研究表明:尼尔基水库运行后,下游河流极值流量、低流量脉冲的频率及历时、径流涨、落水率次数和流量涨落逆转次数都发生了明显改变,尼尔基下游河流整体水文改变度为51%,为中度改变;受尼尔基水利工程建设的影响,下游河道内的生物多样性指数均值由水库运行前的24减小到水库运行后的18,生物多样性和生物量减少,生态系统呈现退化趋势。更多还原

【Abstract】 The Mann-Kendall test was used to do the mutability test of the annual average discharge of Tongmeng Station II on Nenjiang River. The RVA method was used to analyze the influence of the operation of Nierji Hydro Project on the downstream from the aspects of river hydrological status and ecological diversity. The study results showed that the extreme flow, the frequency and duration of low flow pulse, the rise and fall rates of runoff and number of flow reversal after the operation of Nierji Reservoir changed significantly. The overall hydrological change degree of the downstream was 51%, a moderate change. The mean value of biodiversity index decreased from 24 to 18 after the operation of reservoir. The biodiversity and biomass in the lower reaches of Nierji River decreased, and the ecosystem presented a degradation trend.更多还原