丹江口水库对汉江下游水文过程的影响

Analysis of influence of Danjiangkou Reservoir on hydrological process of lower reach of Hanjiang River

随着汉江水资源利用程度的提高,汉江径流特性在一定程度上发生了变化.为分析丹江口水库建设对汉江下游水文过程的影响,利用汉江丹江口水库以下的干流站点黄家港站、谷城站、襄阳站、皇庄站、沙洋站和仙桃站的实测月平均流量资料,利用Morlet小波分析法分析汉江下游水文周期的时空变化,研究表明,丹江口水库的建设导致汉江下游水文周期出现了间断现象,且除了仙桃站点以外,其他站点的水文周期于1993年左右之后消失,且越靠近丹江口水库,受影响程度越大;利用flow health软件分析汉江下游其他水文过程的时空变化,研究表明丹江口水库的建设导致汉江下游水文过程受到很大影响,尤其是连续高流量、流量季节性变化以及洪峰流量间隔受影响程度较大.同样,越靠近水库受影响程度越大.

With the utilization of water resources of Hanjiang River, the flow regime of the river has been altered in some degree. In order to analyse the influence of the Danjiangkou Reservoir, the Morlet wavelet analysis method is used to analyze the temporal and spatial variation of hydrologic cycles and the Flow Health software is used to analyse the temporal and spatial of hydrologic process of the lower reach of the Hanjiang River. Both of the methods are based on the average monthly flow of Huangjiagang, Gucheng, Xiangyang, Huangzhuang, Shayang, Xiantao stations of the main stream of the Hanjiang River. The re- sults show that the construction of Danjiangkou Reservoir results in the change of the hydrologic process, the gaps and disappearance after 1993 of hydrologic cycles except Xiantao station. Furthermore, the per- sistent high flow, seasonality flow shift and flood flow interval are highly affected. The hydrological process is affected more seriously as the distance of station is closer to the reservoir.