摘要
Abstract
In order to characterize the runoff and sediment yield patterns under different conservation measures in experimental plots during typical heavy rainfall events,statistical methods such as frequency analysis and correlation analysis were adopted to study the observation data from the runoff plots in Shangxiakou small watershed of Beijing in 2023.The results showed that the minimum rainfall grade causing runoff in the runoff plots of Shangxiakou small watershed was light rain and the minimum runoff-producing rainfall was 9.0 mm under heavy rainfall conditions.Moreover,in the four runoff plots,namely the afforestation(Platycladus Orientalis)plot,horizontal strip(Apricot Tree)plot,fish-scale pit(Cotinus Coggygria,Platycladus Orientalis)plot and sloping cropland(Maize)plot,the runoff generated by rainstorms and above-grade rainfall accounting for 9.68％total rainfall frequency and 97.98％,95.94％,89.89％,85.17％annual runoff,respectively.Furthermore,the soil loss accounted for 93.75％,88.41％,69.61％and 70.31％of higher annual soil loss due to the heavy rainfall,even though the frequency of rainstorms and above-grade rainfall was relatively low compared with other tapes of rainfall of more frequencies.The key rainfall factor affecting runoff was the product of rainfall amount P and the maximum 30-min rainfall intensity I30—PI30,and the key rainfall factors affecting soil loss were I30 and PI30.The research results provided a technical basis for formulating soil and water loss prevention measures and soil and water conservation planning.关键词
降雨量/降雨强度/水土流失/径流量/土壤流失量Key words
rainfall/rainfall intensity/soil erosion/runoff/soil loss amount分类
建筑与水利
