山东省药乡小流域侵蚀性降雨分布特征

发布时间：2018-10-12 18:46

【摘要】：为探究山东省药乡小流域侵蚀性降雨分布特征,本研究选择裸地坡面径流小区为研究对象,利用小区观测法得到的降雨、径流以及泥沙等资料,通过频率分析法拟定研究区侵蚀性降雨标准,并运用数理统计方法从时间、降雨强度、降雨侵蚀力角度分析侵蚀性降雨分布特征。结果表明:1)该研究区侵蚀性降雨标准为降雨量17.3 mm;2)7月份侵蚀性降雨场次、降雨量、径流量和产沙量占侵蚀性降雨比例为42.31%、45.71%、85.78%和97.97%,其他月份侵蚀性降雨分布较少;3)大雨、暴雨以上侵蚀性降雨,高降雨强度型降雨场次分别占相应雨量等级比例为60%和100%,其产沙量所占比例分别为75.07%、100%;4)降雨侵蚀力1 000 MJ·mm/(h·hm2)侵蚀性降雨产沙量占侵蚀性降雨比例为95.26%,其径流深是≤1 000 MJ·mm/(h·hm2)侵蚀性降雨3倍以上。以上研究表明,研究区侵蚀性降雨标准为17.3 mm,其主要分布在中雨以上雨量等级,造成严重土壤侵蚀的侵蚀性降雨多为高降雨强度型降雨或降雨侵蚀力1 000 MJ·mm/(h·hm2)的降雨,且其多分布于7月份。本文结果有助于研究区小流域侵蚀性降雨规律分析以及土壤侵蚀规律研究。
[Abstract]:In order to investigate the characteristics of erosive rainfall distribution in Yoxiang small watershed in Shandong Province, the runoff plot on bare slope was selected as the research object, and the rainfall, runoff and sediment data obtained by plot observation method were used. The standard of erosive rainfall in the study area was worked out by frequency analysis method, and the distribution characteristics of erosive rainfall were analyzed from the angle of time, rainfall intensity and rainfall erosivity by means of mathematical statistics. The results are as follows: 1) the standard of erosive rainfall in this study area is 17. 3 mm;2). In July, the ratio of rainfall, runoff and sediment yield to erosive rainfall is 42.31% and 97.97% respectively, while the other months are less than that of other months, and the ratio of rainfall, runoff and sediment yield to erosive rainfall is 42.31% and 97.97%, respectively. Erosive rainfall above the rainstorm, The proportion of high intensity rainfall to the corresponding rainfall grade is 60% and 100% respectively, and the proportion of sediment yield is 75.07%. The ratio of sediment yield to erosive rainfall is 1 000 MJ mm/ (h hm2). The ratio of erosion rainfall and sediment yield to erosive rainfall is 95.26%, and the runoff depth is 鈮，

本文编号：2267209