【摘要】 流域年径流量是水资源评价与合理配置利用的重要依据,而水土保持减水定额又是估算水土保持对河川年径流量影响的基础。综合分析了水土保持减水作用现有主要研究成果,在对黄河上中游进行生态环境建设分区的基础上,采用小流域综合治理法,计算出黄土丘陵沟壑区、黄土高塬沟壑区、土石山区的水土保持减水定额依次为245.5、118.5、471.9m3/hm2,并提出了推求黄河流域水土保持减水量的有效途径。更多还原

【Abstract】 Annual runoff amount of river basin is a significant basis of water resources evaluation and its allocation in reason, while water reduction norm of soil conservation is a foundation of estimating influences of soil and water conservation on annual runoff amount of river. On the basis of comprehensive analysis on present achievements of water reduction function and environment conservation regionalization of upper and middle reaches of Yellow River, adopting method of integrated management of small watershed, water reduction norms of soil and water conservation of regions are calculated, which are 245.5?m~3/hm~2 in loess hilly region, 118.5?m~3/hm~2 in loess plateau and hilly region and 471.9?m~3/hm~2 in earth-rocky mountainous region respectively. At last, reasonable approaches of inquiring into water reduction amount are probed into.更多还原