CHAI Xueke,GAO Peng,JIANG Guantao,et al.Spatiotemporal Variability of Rainfall Erosivity in Weihe River Basin[J].Research of Soil and Water Conservation,2016,23(03):25-28,36.
渭河流域降雨侵蚀力时空变化研究
- Title:
- Spatiotemporal Variability of Rainfall Erosivity in Weihe River Basin
- 分类号:
- S157.1
- 摘要:
- 降雨侵蚀力是反映流域降雨侵蚀能力的重要指标。基于渭河流域及周边地区25站56年的日降雨量，分析了流域降雨侵蚀力及其时空变化。结果表明：渭河流域降雨侵蚀力与降雨量的空间分布趋势基本一致，由东南向西北递减，变化范围为1 000～3 600 MJ·mm/（hm2·h·a）；降雨侵蚀力在年内呈单峰型分布，8月最大，1月最小，但6—9月占年侵蚀力的70%左右；渭河流域各站降雨侵蚀力年际差异显著；降雨侵蚀力年际变率为0.40～0.54，尤其20世纪80年代以来随机波动大且表现出一定减小趋势，但整体并无显著增加或减少趋势。
- Abstract:
- Rainfall erosivity is an index of erosion ability of rain water. Using the daily rainfall data of twenty-five meteorological sites in Weihe River, we estimated the rainfall erosivity and analyzed its spatiotemporal variability. The results showed that the spatial characteristic of rainfall erosivity was consistent with the spatial distribution of rainfall, declining from southeast to northwest and varying from 1 000 to 3 600 MJ·mm/(hm2·h·a). The distribution of rainfall erosivity is unimodal,the max value occurred in August, the minimum was observed in January and rainfall erosivity from June to September occupied about 70% of the whole year. The inter-annual variation was significant and coefficient of variation was between 0.4 and 0.54. Especially random fluctuations and a decreasing trend had been showed since the 1980s, but there was no significant trends of variation totally.
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备注/Memo
收稿日期:2015-01-18;改回日期:2015-06-18。
基金项目:国家自然基金（41371277）；中国科学院重点部署项目（KZZD-EW-04-03）；中国科学院青年创新促进会（2011289）
作者简介:柴雪柯(1993-),女,山西运城人,硕士研究生,研究方向为流域生态水文和水土保持。E-mail:chaixueke@163.com
通讯作者:高鹏(1976-),男,陕西宝鸡人,博士,副研究员,硕士生导师,主要从事水土保持和流域生态水文研究。E-mail:gaopeng@ms.iswc.ac.cn