论文部分内容阅读
本文概括总结了较大流域综合治理减沙效益的计算方法,估算了减沙效益的定量数值,并对影响减沙效益的因素进行了初步探讨. 无定河是黄河中游水土流失严重的一条较大支流.建国以来,采取大面积水土保持和坝库工程控制相结合的治理方法,取得显著成效.本文利用水文资料分析和水利、水土保持措施数量对减沙效益进行估算,截止1981年,坝库共拦沙18亿立米,其中1971～1980年平均每年减少入黄泥沙近1.6亿吨,扣除因降雨量减少对减沙效益的影响,流域内因综合治理减沙效益亦达50％以上.通过对流域内地处黄土丘陵沟壑区的大理河的典型分析表明,在各项治理措施的拦沙效益中,淤地坝最大。其次是水库,治坡措施拦沙效益较小.
This paper summarizes the calculation method of sediment reduction benefit of comprehensive management of large river basins, estimates the quantitative value of sediment reduction benefit, and discusses the factors that affect the sediment reduction benefit.The Wuding River is a serious soil erosion in the middle reaches of the Yellow River Big tributaries.After the founding of the People’s Republic of China, a large area of soil and water conservation and dam engineering control to achieve a combination of control methods, and achieved remarkable results.In this paper, the use of hydrological data analysis and water conservancy, soil and water conservation measures the number of sediment reduction benefits estimates, as of 1981, dam The reservoir blocks a total of 1.8 billion cubic meters of sediment, of which an average of nearly 160 million tons of sediment is reduced every year from 1971 to 1980. After deducting the impact of reduced rainfall on the benefits of sediment reduction, sediment yield in integrated watersheds has also reached over 50%. The typical analysis of the Dali River in the gully region of Loess Plateau within the basin shows that the silt dam is the largest among the sediment-removing benefits of various control measures. Followed by reservoirs, slope control measures to reduce sediment efficiency is small.