Spatial and Temporal Characteristics of Rainfall Erosivity in Minjiang River Basin

SHI Zhan; TAO He-ping; LIU Bin-tao; GUO Bing; SONG Chun-feng

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Spatial and Temporal Characteristics of Rainfall Erosivity in Minjiang River Basin

- Spatial and Temporal Characteristics of Rainfall Erosivity in Minjiang River Basin
- Bulletin of Soiland Water Conservation Vol. 32, Issue 2, Pages: 97-101(2013)
- 作者机构：
  
  1. 中国科学院水利部成都山地灾害与环境研究所,四川,成都,610041
  2. 中国科学院大学,北京,100049
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2013
- 稿件说明：
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SHI Zhan, TAO He-ping, LIU Bin-tao, et al. Spatial and Temporal Characteristics of Rainfall Erosivity in Minjiang River Basin[J]. Bulletin of Soiland Water Conservation, 2013, 32(2): 97-101.
DOI：

SHI Zhan, TAO He-ping, LIU Bin-tao, et al. Spatial and Temporal Characteristics of Rainfall Erosivity in Minjiang River Basin[J]. Bulletin of Soiland Water Conservation, 2013, 32(2): 97-101. DOI：

摘要

利用岷江及周边流域124个气象水文站1981-2010年的日降雨资料计算了该区域的降雨侵蚀力。通过克吕格插值法生成降雨侵蚀力的空间分布图

采用泰森多边形和K-Means聚类法将其划分为3个等级并得到各等级的空间分布格局。根据离差系数、趋势系数和倾向率指标分析了站点年际变化特征及不同等级的时空变化格局。结果显示:(1)年均降雨侵蚀力表现出东南部高

向西迅速降低的特征

且呈现以雅安-乐山为中心向东北、西南递减缓慢

向西北递减迅速的环状空间分布格局;(2)岷江流域降雨侵蚀力聚类为侵蚀低、中、高值区

其聚类中心分别为1 054.73

4 594.50和7 153.75MJ.mm/(hm

.h.a)

其中侵蚀低值区主要分布在岷江流域上游和大渡河支流流域

中值区主要分布在岷江中下游流域

高值区集中分布在岷江中游的雅安、乐山、眉山和都江堰地区;(3)降雨侵蚀力年际变化呈南北分异特征

以都江堰-汶川-小金-丹巴为界

北部变化大于南部

变化趋势呈东西分异特征

以茂县-理县-汶川-宝兴-天全-汉源-峨边-沐川-宜宾一线以东呈下降趋势

以西呈上升趋势。不同地区的降雨侵蚀力变化趋势的显著程度也不同。

Abstract

In order to analyze the spatial distribution and temporal change of rainfall erosivity in MinjiangRiver Basin

rainfall erosivity was calculated using daily data from 124stations during 1981-2010.Its spatial distribution map was created by Kriging interpolation.Based on Thiessen polygons theory and K-Meanscluster method

we divided the rainfall erosivity into three classes and analyzed the deviation coefficient

tendency coefficient and trend rate of each class.The results showed that annual rainfall erosivity was high insoutheast and lowered rapidly towards west.The rainfall erosivity was divided into three classes with clustercenter of 1 054.73

4 594.50and 7 153.75MJ·mm/(hm2·h·a)respectively.The area of low values wasmainly located in the upstream of the basin and its branch Dadu River basin

the area of intermediate valueswas mainly located in middle and lower reaches

and the high value area was found mainly in the regions ofYa'an

Leshan

Meishan and Dujiang weirs.The inter-annual variability differed spatially;more variationswere found in northern area than in southern area

as divided by the transect of Dujiangyan-Wenchuan-Xiaojin-Danba.Increasing inter-annual variability was found in the western part

whereas decreasing variability in the eastern part.The significance levels of changing trends differed spatially.

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