Temporal-Spatial Variations of Rainfall Erosivity in Daning River Watershed of Three Gorges Reservoir Region

HUA Li-zhong; HE Xiu-bin; YAN Chang-zhou; NAN Hong-wei

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Temporal-Spatial Variations of Rainfall Erosivity in Daning River Watershed of Three Gorges Reservoir Region

- Temporal-Spatial Variations of Rainfall Erosivity in Daning River Watershed of Three Gorges Reservoir Region
- Bulletin of Soiland Water Conservation Vol. 27, Issue 4, Pages: 22-25(2008)
- 作者机构：
  
  1. 中国科学院城市环境研究所,福建,厦门,361012
  2. 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
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2008
- 稿件说明：
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HUA Li-zhong, HE Xiu-bin, YAN Chang-zhou, et al. Temporal-Spatial Variations of Rainfall Erosivity in Daning River Watershed of Three Gorges Reservoir Region[J]. Bulletin of Soiland Water Conservation, 2008, 27(4): 22-25.
DOI：

HUA Li-zhong, HE Xiu-bin, YAN Chang-zhou, et al. Temporal-Spatial Variations of Rainfall Erosivity in Daning River Watershed of Three Gorges Reservoir Region[J]. Bulletin of Soiland Water Conservation, 2008, 27(4): 22-25. DOI：

摘要

利用三峡库区大宁河流域及其周边共21个雨量站8 a的日降雨量资料

按照日降雨量侵蚀力模型

在地理信息系统软件ArcGIS9.0支持下

分析了该流域降雨侵蚀力的时空分布特征。研究表明

该流域年均降雨侵蚀力R值在空间分布上与流域高程变化一致。随着流域高程变化

侵蚀力R值呈现上游迅速降低

中游平缓到下游增大的趋势

最高和最低侵蚀力R值分别位于流域西北部的高楼站附近和西南部的福田站附近;降雨侵蚀力R值的年际分配差异明显

最大年R值为最小年R值的2.16倍;降雨侵蚀力R值的季节分布呈单峰型

集中程度高

5—9月上半月占全年的90.4%

全年R值的高峰出现于7月份和8月份上半月

占全年的38.8%。

Abstract

With the aid of the rainfall erosivity model using daily rainfall and geographic information system ( GIS) software

ArcGIS 9.0

daily rainfall data from 21 weather stations in Da’ ning River watershed and its adjacent area

the Three Gorges Reservoir Region

were used to analyze the temporal2spatial variations of rainfall erosivity(R factor) for the watershed.R factor varied consistently with watershed elevation.R factor decreased rapidly in the upper reaches of the watershed from Gaolou station to Wuxi station

trended towards gentleness in the middle reaches from Wuxi station to Dachang station

and increased gradually in the down reaches from Dachang station to Wushang station(watershed outlet) .There was a great variation in year-toyear R factor with the maximum being three times greater than the minimum.The distribution of rainfall erosivity was highly seasonal with a single peak.Summer months from May to early September typically contributed 90.4 % of the yearly R factor.July and early August were the peak months with more than 38 % of the yearly R factor.

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Related Author

CAI Qiang-guo

HE Ji-jun

WANG Xue-qiang

HUA Li-zhong

HE Xiu-bin

YAN Chang-zhou

NAN Hong-wei

WEI Jie

Related Institution

Institute of Geographical Sciences and Natural Resources and Key Laboratory of Water Cycle & Related Land Surface Processes,Chinese Academy of Sciences

Graduate School of the Chinese Academy of Sciences

College of Resources and Environment,Huazhong Agricultural University

Institute of Spatial Information Technology,Xiamen University of Technology

Institute of Mountain Hazards and Environment, Chinese Academy of Sciences

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