摘要
小流域综合治理的减沙效益,目前还没有比较理想的计算方法,一般都是根据治理前后输沙模数的差异进行推算。本文指出:输沙模数不单纯因为经过综合治理而减小;同时还受降雨情况的影响,因而变化幅度很大。并且输沙模数与降雨量等特征值的相关性不好,故给减沙效益计算带来许多困难。作者经过统计分析发现,输沙模数与径流量之间密切相关。因此可以根据径流量的变化情况,推算出降雨情况对输沙模数的影响,从而可以比较准确地计算减沙效益。
A satisfied method for calculating sediment reduction bencfit in comprehensive control of small watershed is not available at present. The difference of sediment delivery modulus before and after control is usually used to estimate the benefit. This paper pointed out that the sediment delivery modulus had a great variance as it's not reduced by synthetic control but by precipitation, and there was no Significated interrelation between sediment delivery modulus and characteristic value of precipitation etc, which brought about difficulty of benefit estimating.The author found that there was a closed relationship between Sediment delivery modulus and runoff rate, and the effect of preciptation on sediment modulus could be estimated by runoff rate, so that the sediment reduction benefit might be calculated accurately.
出处
《水土保持通报》
CSCD
北大核心
1991年第1期18-22,27,共6页
Bulletin of Soil and Water Conservation
关键词
黄土高原
小流域
综合治理
减沙
comprehensive control sediment dolivery modulus small watershed
