鹤鸣观小流域综合治理减水减沙效益研究

BENEFITS OF COMPREHENSIVE CONTROL IN REDUCTION OF WATER AND SEDIMENT IN HEMINGGUAN WATERSHED

本文应用鹤鸣观小流域试验观测资料 ,研究了小流域综合治理的减水减沙效益。研究结果表明 :该流域降雨、产流、输沙主要集中于汛期 ( 5月～ 1 0月份 )。流域年降雨量和径流量序列无明显的下降趋势 ,而输沙量序列逐年下降趋势明显 ,水沙关系向良好方向发展。各项治理措施中 ,坡面水利水保工程在减水减沙作用中占主导地位 ,林草措施减水减沙效果显著 。

On the basis of the data of the firsthand observations in the Hemingguan Watershed,a study was made on benefits of comprehensive control in reduction of water and sediment. Results show that rainfall,runoff and sediment are concentrated in the high-water season (May to October),the sequence of annual rainfall and runofff has little declining tendency while the sequence of annual sediment transportation declines evidently,which indicates the turning-better tendency of water and sediment in the watershed after comprehensive control. Among the conservation measures taken,water conservancy practices and conservation engineering play a leading role in reducing water and sediment. The benefit of afforestation and grass-planting is remarkable but noticeable in hysteresis. \;