Preliminary Study on Rainfall Erosivity in the Southern Loess Plateau

WU Guang-yan; ZHU Zhen-hua; CHENG Jing; WU Ri-na; ZHANG You-song; WU Fa-qi

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Preliminary Study on Rainfall Erosivity in the Southern Loess Plateau

更新时间：2024-11-07

- Preliminary Study on Rainfall Erosivity in the Southern Loess Plateau
- Vol. 25, Issue 2, (2011)
- 作者机构：
  
  西北农林科技大学,资源环境学院,陕西,杨凌,7121002. 北京林业大学水土保持学院,水土保持与荒漠化防治教育部重点实验室,北京,100083
- 作者简介：
- 基金信息：
- DOI：
  CLC： S157.1
- Published：2011
- 稿件说明：
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WU Guang-yan, ZHU Zhen-hua, CHENG Jing, et al. Preliminary Study on Rainfall Erosivity in the Southern Loess Plateau[J]. 2011, 25(2).
DOI：

WU Guang-yan, ZHU Zhen-hua, CHENG Jing, et al. Preliminary Study on Rainfall Erosivity in the Southern Loess Plateau[J]. 2011, 25(2). DOI：

摘要

基于Wischimeier关于降雨侵蚀力R=EI30的经典算法

以黄土高原南部杨凌天然降雨为研究对象

较详细地分析了一次降雨过程雨滴大小分布;拟合了雨滴中数直径、降雨动能与降雨强度的关系;分别以EI10、EI30、EI60为降雨侵蚀力R指标

计算了该地区6-9月降雨侵蚀力大小

研究分析了降雨侵蚀力与降雨量之间的关系。得出以下结论:雨滴大小分布满足Best提出的分布式;雨滴中数直径反映次降雨过程中雨滴大小的总体趋势

与降雨强度关系密切

其关系式可表示为D50=2.25I0.21;降雨动能由降落雨滴从高空下落而具有的能量

以及与雨滴直径和下落速度有直接关系

得出降雨动能与降雨强度的关系式为E=26.57I0.28;杨凌区降雨量多集中于6-10月

月降雨侵蚀力分布随着月降雨量变化而变化;3种R指标计算的降雨侵蚀力值

EI10>EI30>EI60

且3种指标计算结果与CREAMS月雨量经验模型的相对偏差中

EI10与其相对偏差最小

但波动幅度较大

EI30与其相对偏差居中

但相对较稳定

分析得出EI10更适用于短阵型降雨

EI30适用于普通型降雨。基于上述理论

本研究旨在为今后建立黄土高原南部地区降雨侵蚀力简易计算模...

Abstract

According to the classical algorithm by Wischimeier of rainfall erosivity R=EI30

this study

taken the natural rainfall in Yangling of southern Loess Plateau as the research object

analyzed in detail the size distribution of rainfall during a precipitation process

and regressed the relationship between the median diameter of raindrops

rainfall energy and rainfall intensity

meanwhile

rainfall erosivity from June to September with the indicators of EI10

EI30

EI60 was calculated

as well as the relationship betw...

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