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北京地区风沙灾害的自然成因分析

发表时间:2008-07-15  浏览量:1554  下载量:785
全部作者: 刘连友,史培军,胡霞,刘天科,郭兰兰,张小啸,孙炳彦,唐艳,吕艳丽
作者单位: 地表过程与资源生态国家重点实验室;环境演变与自然灾害教育部重点实验室;北京师范大学减灾与应急管理研究院;中国国土资源经济研究院
摘 要: 本文以华北沙尘源地——北方农牧交错带为研究区域,分析我国农牧交错带风沙动力条件的变化对北京地区风沙活动的影响。研究结果表明,农牧交错带风沙活动主要发生在春季,起沙风频率占全年的39.8%;起沙风的主导风向是北北西(NNW),北西(NW),北西西(NWW)和北(N),分别占19.73%,12.81%和9.18%. 北京2000年沙尘暴灾害加剧的主导因素是1999年至2000年间连续干旱、降水减少所引起的地表干旱化和伴随植被退化而引起的土地沙化,从而使沙尘起动风速大大降低,风沙灾害加剧。并且,北京市大气污染指数的季节性变化也明显地受北方农牧交错带春季风沙活动的影响。
关 键 词: 地理学;风沙灾害;起沙风;降水;风蚀气候指数
Title: Analysis of natural factors influencing blown sand hazards in Beijing
Author: LIU Lianyou, SHI Peijun, HU Xia, GUO Lanlan, ZHANG Xiaoxiao, SUN Bingyan, TANG Yan, LIU Tianke
Organization: State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University;Key Laboratory of Environment Change and Natural Disaster, Ministry of Education, Beijing Normal University;Academy of Disaster Reduction and Emergency Management, Beijing Normal University
Abstract: In this paper, the natural factors in the farming-pastoral ecotone, which might influence the blown sand hazards in 2000, Beijing, were analyzed. The results indicated that, springtime is the season with highest frequency of erosive wind, the frequency was 39.8%, and the prevailing wind directions were NW, NWW and N, with a frequency of 19.73%, 12.81 and 9.18%. The dominant factors for the intensified sand and dust storms in Beijing might be a favorable wind condition in combination with a durable drought from 1999 to 2000, which led to land surface desiccation, vegetation degradation and land surface mobility. Air pollution index in Beijing is obviously affected by sand blown activities in springtime.
Key words: geography; blown sand hazards; sand carrying winds; rainfall; climatic index of soil erosion by wind
发表期数: 2008年11月第13期
引用格式: 刘连友,史培军,胡霞,等. 北京地区风沙灾害的自然成因分析[J]. 中国科技论文在线精品论文,2008,1(13):1469-1476.
 
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