近50年大凌河流域径流变化特征分析

以大凌河流域3个水文站的径流资料和15个雨量站的降水资料为基础,利用多指标、多方法分析了近50年大凌河流域径流的年内和年际变化特征。结果表明:大凌河流域径流年内分配不均匀,主要集中在7、8月份;径流年际变化大。近50年来,大凌河流域年径流量呈显著减少趋势,流域径流量在1981年出现明显的减少突变,自然因素和人类活动特别是大量水利工程的修建是造成径流变化的重要因素。

Characteristics of Runoff Variation in Dalinghe River Basin in Recent 50 Years

The study on time series characteristics of runoff variation in the Dalinghe River Basin has certain scientific significance for the reasonable exploitation of water resources and ecological environment protection. In this paper, with runoff series at 3 hydrometry stations and precipitation series at 15 precipitation stations in the Dalinghe River Basin, the runoff variation characteristics were analyzed with multiple indexes and some methods. The results show that distribution of annual runoff is uneven, mainly in July and August. The inter -annual variation is great with significant difference between wet year and dry year. The tendency of annual runoff reduction is significant, with an abrupt point happening in 1981. The decrease of precipitation and human activities are the key factors influencing on the runoff