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目前径流变化相关研究较少涉及径流的不同组分。利用湖南省澧水流域4个水文站点长序列观测资料,不仅分析了2007-2011年相对于1985年以前径流总量及其历时曲线的变化,也分析了地表径流和基流及其历时曲线的变化。与1985年以前比,流域年降雨量保持不变,最显著的变化为森林覆盖率的增加和大量水库的修建。这些人类活动没有造成年径流总量、年基流量和年地表径流量的显著变化,但在日时间尺度上对径流过程产生了重要影响。地表径流和地下径流对人类活动存在差异性响应,2007年以后地表径流在洪峰期流量变小而其他时段变大,而地下径流汇水受人类活动影响较小,基流流量除枯水期外与1985年以前基本一致。本文所揭示的规律可能在中国南方具有一定的代表性。
The current research on runoff change involves less about the different components of runoff. Using the long sequence observation data of 4 hydrological stations in Huangshui River Basin in Hunan Province, this paper not only analyzes the changes of total runoff and its duration before 2007 from 2007 to 2011, but also analyzes the effects of surface runoff, base flow and its duration curve Variety. Compared with 1985, annual rainfall in the basin remained unchanged. The most significant changes were the increase of forest coverage and the construction of a large number of reservoirs. These human activities did not cause significant changes in annual runoff, annual base flow and annual surface runoff, but they had a significant impact on runoff processes on a daily time scale. Surface runoff and underground runoff have different responses to human activities. After 2007, the runoff of surface runoff decreases during flood peak and becomes larger during other periods. However, underground runoff catchment is less affected by human activities. Basically the same as before The law disclosed in this article may have some representation in southern China.