黄河三角洲典型流域径流变化及其对降水的滞后性分析     

董立峰  邵金花  李德一  左登华 《滨州学院学报》2012,(3):39-44

以黄河三角洲地区徒骇河流域为例,采用集中度、集中期等方法对徒骇河流域1970年代以来径流、降水特征及其变化进行了分析.结果表明,徒骇河流域河川径流量年内主要集中在6～10月,集中期主要在7月下旬至8月上旬;降水主要集中在6～9月,集中期主要在7月中旬和下旬;径流对降水具有滞后效应,多年平均滞后时间约为11.1d.  相似文献   

Phosphorus transport with runoff of simulated rainfall from purple-soil cropland of different surface conditions   总被引：5，自引：0，他引：5  

GAO Yang  ZHANG Jin-zhong  ZHU Bo  ZHOU Pei  MIAO Chi-yuan  WANG Tao 《重庆大学学报(英文版)》2008,7(2):85-92

We investigated the patterns of phosphorus transport from purple-soil cropland of 5° and 10° slopes with bare and vegetated surfaces, respectively. Each type of land was tested under a simulated moderate rainfall of 0.33 mm/min, a downfall of 0.90 mm/min, and a rainstorm of 1.86 mm/min. Runoff dynamics and changes in the export amount of phosphorus are influenced by the rainfall intensity, the slope and surface conditions of cropland. The vegetation diverts rain water from the surface into soil and helps the formation of a subsurface runoff, but has little influence on runoff process at the same sloping degree. Vegetated soil has a smaller phosphorous loss, particularly much less in the particulate form. A heavier rainfall flushes away more phosphorous. Rainwater percolating soil carries more dissolved phosphorous than particulate phosphorous. Understanding the patterns of phosphorous transport under various conditions from purple soil in the middle of Sichuan basin is helpful for developing countermeasures against non-point-source pollution resulting in the eutrophication of water bodies in this region that could, if not controlled properly, deteriorate the water quality of the Three Gorges Reservoir.  相似文献   

暴雨径流资源的调控－以吉林省西部为例   总被引：4，自引：0，他引：4  

龙花楼蒙吉军  张献忠 《资源科学》1998,20(4):50-56

在我国广大兰干旱地区,一方面降水量少,水资源短缺;另一方面,降水又集中在7、8月,且多以暴雨形式出现,给农业生产带来严重危害。探讨暴雨径流资源的合理调控,有助于变灾害性的暴雨径流为宝贵的水资源,对实现农业可持续发展有着十分重大的意义。本文以吉林省西部为例,在分析水资源概况及其在利用上存在的问题和暴雨的地域分异,及划分暴雨径流资源调控区的基础上,对如何实施吉林省西部暴雨径流资源的调控进行了探讨。文中的调控措施可为其它半干旱区暴雨径流资源的调控提供借鉴。  相似文献