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水利工程日调节作用下河流日内水位、流量陡涨陡落,产生水流脉冲,导致河流生境条件与天然状况下迥异,可对河流生态系统健康造成影响。基于安徽省第一大水库陈村水库上下游水文站逐时水位资料,应用水流脉冲频率、历时、大小等生态水文评价指标对陈村水库的日调节影响进行逐月评价,获得了水库下游不同调峰流量、不同调峰历时的水流脉冲的各月分布特征。评价结果可定量反映水库日调节作用下泄非恒定流的水流特征以及河岸水陆生态交错带的淹没频率、历时及范围等年内分布特征。
Under the daily regulation of water conservancy project, the water level in the river flows sharply and steeply, resulting in a pulse of water current, resulting in a very different habitat condition between rivers and natural conditions, which may affect the river ecosystem health. Based on the hourly water level data of upstream and downstream hydrological stations of the Chencun reservoir in the No.1 Dai-ian reservoir of Anhui Province, the eco-hydrological assessment indexes such as the current pulse frequency, duration and size were used to evaluate the daily regulation of the Chencun reservoir on a monthly basis. The monthly distribution characteristics of peak current and different current peak duration pulse. The results of the evaluation can quantitatively reflect the current characteristics of unsteady flow discharged by the reservoir on a day-by-day basis and the distribution characteristics such as submergence frequency, duration and range of the river bank ecotone.