摘要
通过对赣北红壤坡地上为期6a(2001—2006年)的定点观测,研究确定了该区域侵蚀性降雨的雨量及雨强标准分别为11.20mm和0.88mm/h,并建立了降雨侵蚀力因子"R=∑E.I30"的最佳算式;通过降雨侵蚀力的分析计算,该区多年平均侵蚀力为8695.43J.mm/(m2.h),年内分布上主要集中在夏季;研究中还拟合了该区降雨侵蚀力预报简易算法,结果表明当年降雨总量产生10%的波动时,会导致年降雨侵蚀力总量27%的变化。
Erosive rainfall plays an extremely important role in forecasting and evaluating soil erosion by water. Erosive rainfall and rainfall erosivity （R） in Northern Jiangxi Province are studied based on data observed from 2001 to 2006. Results show that the rainfall amount standard and intensity standard of erosive rainfall events are 11.20 mm and 0.88 mm/h, respectively. The best equation for calculating rainfall erosivity factor in Northern Jiangxi is R= ∑E · I30. By calculation, the mean annual rainfall erosivity is 8 695.43 J · mm/（m^2 · h）, maximum annual rainfall erosivity is 15 140.64 J · mm/（m^2 · h）, and minimum is 5 601.10 J · mm/（m^2 ·h）. The seasonal distribution of R value is mainly concentrated in summer. Through the simple algorithm of R proposed in the paper, percent change in annual rainfall erosivity is greater than percent change in total precipitation.
出处
《水土保持通报》
CSCD
北大核心
2010年第1期74-79,共6页
Bulletin of Soil and Water Conservation
基金
国家“十一五”科技支撑计划重点项目“红壤退化的阻控和定向修复与高效优质生态农业关键技术研究与试验示范”(2009BADC6B006)
水利部公益性行业科研专项经费项目“水蚀地区坡面水土流失阻控技术研究”(200901047)
中国水利水电科学研究院专项基金项目“红壤坡地水土保持效应及机理研究”(泥集0844)
关键词
侵蚀性降雨
降雨侵蚀力
降雨变化
红壤
erosive rainfall
rainfall erosivity factor
precipitation variation
red soil
