【摘要】：為探究山東省藥鄉(xiāng)小流域侵蝕性降雨分布特征,本研究選擇裸地坡面徑流小區(qū)為研究對象,利用小區(qū)觀測法得到的降雨、徑流以及泥沙等資料,通過頻率分析法擬定研究區(qū)侵蝕性降雨標(biāo)準(zhǔn),并運用數(shù)理統(tǒng)計方法從時間、降雨強度、降雨侵蝕力角度分析侵蝕性降雨分布特征。結(jié)果表明:1)該研究區(qū)侵蝕性降雨標(biāo)準(zhǔn)為降雨量17.3 mm;2)7月份侵蝕性降雨場次、降雨量、徑流量和產(chǎn)沙量占侵蝕性降雨比例為42.31%、45.71%、85.78%和97.97%,其他月份侵蝕性降雨分布較少;3)大雨、暴雨以上侵蝕性降雨,高降雨強度型降雨場次分別占相應(yīng)雨量等級比例為60%和100%,其產(chǎn)沙量所占比例分別為75.07%、100%;4)降雨侵蝕力1 000 MJ·mm/(h·hm2)侵蝕性降雨產(chǎn)沙量占侵蝕性降雨比例為95.26%,其徑流深是≤1 000 MJ·mm/(h·hm2)侵蝕性降雨3倍以上。以上研究表明,研究區(qū)侵蝕性降雨標(biāo)準(zhǔn)為17.3 mm,其主要分布在中雨以上雨量等級,造成嚴(yán)重土壤侵蝕的侵蝕性降雨多為高降雨強度型降雨或降雨侵蝕力1 000 MJ·mm/(h·hm2)的降雨,且其多分布于7月份。本文結(jié)果有助于研究區(qū)小流域侵蝕性降雨規(guī)律分析以及土壤侵蝕規(guī)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，

本文編號：2267209