水库建设对下游河流地貌过渡区水文情势影响研究

Study on Effects of Reservoir Construction on Hydrological Regime of Downstream River Morphology Transition Area

以卡普斯浪河温泉水库建设为研究对象,针对温泉水库下游多处水利工程及河道从山区河流向平原河流过渡的特点,采用一维水动力计算模型与二维水动力计算模型相结合的方法,研究温泉水库建设对下游河道水文情势的影响。结果表明,采用一维水动力计算模型与二维水动力计算模型相结合的方法,可以客观反映从上段窄深的山区河道到下段宽浅多汊的平原河道的过渡区域的水动力变化,并用于该区域水文情势变化研究。由于温泉水库的蓄水运用,在汛期8月份,水库下游河道流量明显减少,河道断面的水深、水面宽、流速都明显减小,在主要的农业灌溉用水期(3—6月),水库下游河道流量则普遍增加,相应河道断面的水深、水面宽、流速都相应增加。温泉水库建设对其余月份的水文情势影响不大。

Based on the construction of Capusilang hot spring reservoir and the characteristics of many water conservancy projects at thelower reach of hot spring reservoir and the transition from mountain river to plain river,this paper studies the influence of hot spring reservoir construction on the hydrological regime of the downstream river by combining one-dimensional hydrodynamic calculation model with two-dimensional calculation hydrodynamic model.The results show that the combination of the one-dimensional and two-dimensional hydrodynamic calculation model can objectively reflect the hydrodynamic changes in the transition area from the narrow and deep mountain river channels at the upper reach to the broad,shallow and many-branch plain river channels at the lower reach,which is suitable for the study on the changes of hydrological regime in this area.Due to the storage and operation of the hot spring reservoir,in August of the flood season,the flow of river channel at the lower reach of reservoir reduces significantly,with water depth,water width,and flow rate of river section decreasing obviously.In the main period of agricultural irrigation(from March to June),the flow of river channel at the lower reach of reservoir rises generally,with water depth,water width,and flow rate of river section increasing correspondingly.However,the construction of hot spring reservoir exerts little impact on the hydrological regime in the remaining months.