环江流域90年代水沙变化研究及治理方略探讨

 根据实测水文资料,对泾河2级支流环江流域20世纪90年代水沙变化进行了较为深入的分析和研究,利用3种方法计算环江流域90年代综合治理的减洪减沙效益;分析了流域地下径流补给变化情况,估算了流域地表水资源利用率;对环江流域水资源开发利用及今后治理方略进行了探讨。研究结果表明:进入90年代后,环江流域最大24h降雨量明显增大,径流、泥沙大幅度增加,单位(mm)有效降雨产洪产沙量为4个阶段的最大值。流域综合治理措施减洪减沙作用减弱,地下径流补给情况有所好转,地表水资源利用率不高。据此提出了环江流域综合治理的总方略,可供环江流域水土保持生态工程建设参考。

Water and Sediment Variations of Huanjiang River Basin in 1990s and Discussion on Its Controlling Methods

Based on surveyed hydrologic data, the water and sediment variations in 1990s (from 1990 to 2000) of Huanjiang river basin were deeply analyzed and studied, which is the second level branches of Jinghe river. Taking three methods, the reduction benefits of flood and sediment by integrative measures were calculated, the variation of the underground water supply was analyzed, the utilization rate of the surface water resources in basin was estimated, and the general plan of exploring of water resources and controlling of Huanjiang river basin was discussed. The results showed that since 1990 the maximum precipitation in 24 hours had increased evidently, runoff and sediment had increased by a big margin, and the effective precipitation per mm contributing to flood and sediment had been the highest in four periods. The roles for reduction of flood and sediment by integrative measures reduced, the underground water supply increased, and the utilization rate of surface water was low. Accordingly, a general plan of integrative control was given, which can be used to consult for the eco environment construction of soil and water conservation in Huanjiang river basin.