Simple Algorithm of Rainfall Erosivity in West Guizhou Plateau Area

GU Jingran; ZHANG Xingqi; GU Libin; GUO Xinya; YANG Guangxi; GU Zaike

doi:10.13961/j.cnki.stbctb.2016.02.039

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Simple Algorithm of Rainfall Erosivity in West Guizhou Plateau Area

- Simple Algorithm of Rainfall Erosivity in West Guizhou Plateau Area
- Bulletin of Soiland Water Conservation Vol. 36, Issue 2, Pages: 204-208(2016)
- 作者机构：
  
  1. 南京大学地理与海洋科学学院,江苏,南京,210023
  2. 贵州省水土保持监测站,贵州,贵阳,550002
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2016.02.039
  CLC：
- Published：2016
- 稿件说明：
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GU Jingran, ZHANG Xingqi, GU Libin, et al. Simple Algorithm of Rainfall Erosivity in West Guizhou Plateau Area[J]. Bulletin of Soiland Water Conservation, 2016, 36(2): 204-208.
DOI：

GU Jingran, ZHANG Xingqi, GU Libin, et al. Simple Algorithm of Rainfall Erosivity in West Guizhou Plateau Area[J]. Bulletin of Soiland Water Conservation, 2016, 36(2): 204-208. DOI： 10.13961/j.cnki.stbctb.2016.02.039.

摘要

[目的

]

对黔西高原地区侵蚀性降雨特性进行分析并探索降雨侵蚀力的简易算法

为该区土壤侵蚀预报模型的建立提供理论依据。[方法

]

利用径流小区观测法

基于毕节小区2012-2014年53次降雨过程资料进行分析。[结果

]

(1) 降雨量(P)和最大60 min降雨动能(E

)是影响坡面产流、产沙的两个主要因子。坡面产流、产沙与最大60 min雨强(I

)显著相关;(2) 坡面产流产沙与二元复合因子的相关系数显示

和I

是影响坡面产流、产沙的3类主要降雨复合指标

和EI

与坡面产流产沙的相关系数间相差较小;(3) 基于坡面产流、产沙与降雨单指标和降雨复合指标的相关关系

确定了简易算法的参数。[结论

]

基于可比性

以R=EI

作为参照值对3种简易算法的结果进行决定系数和偏差率比较后

得到研究区便捷、快速的降雨侵蚀力简易算法为:R=0.344(PI

)。

Abstract

[Objective] The characteristics of rainfall were analyzed and the simple algorithm of rainfall erosi-vity of West Guizhou plateau area were studied to provide theoretical basis for the building of the soil erosion prediction model. [Methods] 53 rainfall events of Bijie area from 2012 to 2014 were obtained by means of runoff plots observation. [Results] The results showed that: (1) rainfall amount(P) and rainfall energy of 60 minutes(E60) were two important affecting factors on the processes of slope runoff and sediment. Slope runoff and sediment yield were found significantly correlated with rainfall intensity of 60 minutes(I60). (2) The correlation coefficients between runoff/sediment and the mixed factors of rainfall indicated that EI60

PI60 and I30 I60 were three kinds of the most important impacting factors on soil erosion process. What is more

the correlation coefficient between runoff/sediment and EI60 was slightly different with the one between runoff/sediment and EI30. (3) Parameters of simple algorithm of rainfall erosivity were determined based on the above analyses. [Conclusion] Through the comparison of determination coefficients and the average error rates obtained from three algorithms

the simple algorithm of rainfall erosivity of the study area was expressed as R=0.344(PI60) with reference to R=EI30 for its comparability.

关键词

Keywords

references

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