摘要
湖南省是是全国地质灾害最严重的省份之一。基于1980—2007年湖南97个常规观测站逐12h、逐日降雨量资料和同期发生的地质灾害及湖南灾害大典记录的地质灾害信息，在计算地质灾害发生前1～9d的有效雨量的基础上，判别和筛选了由降雨引发的地质灾害，并引入合理的判别系数判定了致灾的不同降雨类型，从而得出了不同降雨型地质灾害的阈值。研究发现2142条有效地质灾害信息中，64．6％属于降雨型地质灾害（共1384例），其中又有91．4％由短期降雨造成，8．6％由长历时降雨造成；结合致灾雨量阈值给出的不同类型降雨对地质灾害发生的贡献率、雨量阈值和灾害发生频次的分布图，直观显示了全省分县致灾临界雨量及不同降雨型地质灾害的高发区域。
Hunan province is one of the provinces that are mostly affected by geological disasters. The 12 h and daily rainfall data of 97 conventional stations in Hunan from 1980 to 2007, geological disasters information occurred in the same period in Hunan and disaster ceremony records information are used. The 9 d effective rainfall before geo- logical disasters occurrence is calculated （including the same day of disaster occurrence, the same below）, and the geological disasters events caused by rainfall are distinguished. The different types of rainfall caused geological disas- ters are determined by introducing a reasonable coefficient, and the thresholds of different types of rainfall that could cause geological disasters are calculated. It is found that there are 64. 6% rainfall-induced geological disasters （ a to- tal of 1384 cases） in 2142 effective geological hazard information, of which there are 91.4% caused by the short-term rainfall, 8.6% caused by the long duration rainfall ; It is the figure of contribution rate of different types of rainfall to geological disasters, the rainfall threshold and disaster frequency distribution in Hunan which are combined with the hazard threshold, displayed the hazard critical rainfall and geological disasters high incidence area of Hunan.
出处
《灾害学》
CSCD
北大核心
2014年第2期42-47,共6页
Journal of Catastrophology
基金
国家财政部/科技部公益类行业专项(GYHY201306016)
湖南省气象局2010年短平快科研课题
关键词
地质灾害
有效雨量
判别系数
致灾阈值
湖南省
geological disaster
effective rainfall
coefficient of determination
hazard threshold
Hunan province
