摘要
降雨侵蚀力(R)是指由降雨引起土壤侵蚀的潜在能力,是土壤侵蚀定量预报的重要环节。从模型最小估算单位尺度、指标类型和精度2个方面分别将目前降雨侵蚀力模型分为次降雨侵蚀力(Rt)模型、月降雨侵蚀力(Rm)模型、年降雨侵蚀力(Ra)模型以及多年平均降雨侵蚀力(Ra)模型,次雨量模型、日雨量模型、月雨量模型、年雨量模型和综合指标模型,并逐类分析各指标和模型的特点、优劣,为降雨侵蚀力计算时选用合适的指标和模型提供参考。针对现有模型的不足,提出建立基于日雨量的综合指标模型,提高估算精度。综合R因子的研究现状,提出直接观测的设想。
Rainfall erosivity (R) refers to the potential ability of soil erosion caused by rainfall, and is an important part of quantitative prediction of soil erosion.The current rainfall erosivity models can be divided into sub-rainfall erosivity (Rt) model, monthly rainfall erosivity (Rm) model, annual rainfall erosivity (Ra) model and multi-year average rainfall erosivity (Ra) model, sub-rainfall model, daily rainfall model, monthly rainfall model,annual rainfall model and comprehensive index model.The characteristics, advantages and disadvantages of each index and model were analyzed in order to provide reference for choosing appropriate index and model in calculating rainfall erosivity.In view of the shortcomings of the existing models, comprehensive index model based on daily rainfall was proposed to improve the estimation accuracy. Based on the research status of R factor, the idea of direct observation was put forward.
作者
杨轩
YANG Xuan(Anhui Lütong Engineering Design Consulting Co.,Ltd.,Wuhu,Anhui 241000;Institute of Soil Science,Chinese Academy of Sciences,Nanjing,Jiangsu 210008)
出处
《安徽农业科学》
CAS
2019年第16期5-8,共4页
Journal of Anhui Agricultural Sciences
关键词
降雨侵蚀力
计算方法
指标
模型
Rainfall erosivity
Computation method
Index
Model
