人类活动影响下大清河流域降雨径流关系特征分析

Analysis on Dynamic Feature of the Rainfall-Runoff Relationship in the Daqing River Basin under the Influence of Human Activities

以大清河流域北支山区作为研究对象,分析了该流域1980年前后降雨径流关系的动态变化特点。研究结果表明,该流域降雨径流关系并非线性关系。而且1980年以后由于人类活动影响的加剧,该流域降雨径流关系发生了一定的变化,通过对天然状态下与环境变化下该流域降雨径流关系分析,两个时段的降雨径流相关关系很好,但数量上变化较大,随着年降水量的增大,径流量变化率减小。降雨径流关系的这种变化,除受下垫面因素影响外,还与流域内水资源开发利用程度有关。研究和分析降雨径流关系的变化,对水资源开发利用以及水资源评价有重要作用。

This paper analysed the changing feature of rainfall-runoff relationships in the north mountainous area of Daqing river basin before 1980 and after 1980.The result showed that the rainfall-runoff relationship of the river basin was not linear and had been partly altered after 1980 due to the increasing influence of human activities.Through analyzing the rainfall-runoff relationship under the natural and human-impacted conditions,the rainfall-runoff correlations before 1980 and after 1980 are very significant,but the runoff changing rate with annual precipitation was reducing after 1980.This change of rainfall-runoff relationship was related to the level of water resources development and utilization except for the influence of underlying surface factors in the river basin.The study of the rainfall-runoff relationship is important for the exploitation and assessment of water resources.