摘要
以研究区周边19个气象站点的降雨数据为基础,通过空间插值拟合得到研究区2010年8月13—14日区域的降雨分布图,同时,将研究区划分为138条小流域;通过分析和统计这次降雨过程触发的23处地质灾害点所在小流域的降雨量,研究震后地质灾害群发的降雨阈值。研究表明:81.7mm为研究区震后地质灾害群发的降雨阈值,其值比震前降雨阈值降低了59.15%,而实际降低的幅度可能比这个更大。相应于采用单一气象站点的降雨量,采用区域降雨量分布图进行地质灾害降雨阈值研究相对更为客观,对于丰富和完善降雨阈值研究方法也具有借鉴意义。
Based on rainfall data of 19 meteorological stations around study area, regional rainfall map of Au- gust 13 to 14, 2010 was obtained in the way of spatial interpolation. This paper divided the study area into 138 small watersheds. According to analysis and statistics the rainfall of small watershed where 23 geo-haz- ards were triggered by the rainfall of August 13 to 14, 2010, the study on rainfall threshold of geo-hazard af- ter Wenchuan earthquakde was carried out. The result shows that 81.7ram of rainfall is the threshold of mass geo-hazards occurrence in study area after Wenchuan earthquake, which is 59.15% lower than before the earthquake, and the actual reduction in amplitude may be greater than that. Compared to using rainfall of a single meteorological station, the regional distribution of rainfall is more objective to study the rainfall threshold of geo-hazards. The research method used in this paper is referential significance to enrich and im- prove the study of rainfall threshold of geo-hazards.
出处
《水土保持研究》
CSCD
北大核心
2013年第5期237-240,共4页
Research of Soil and Water Conservation
基金
国家高技术研究发展计划(2012AA121302)
西南科技大学博士基金(11zx7160)
关键词
降雨阈值
地质灾害
区域降雨分布
小流域
汶川地震
rainfall threshold
geo-hazard
regional rainfall map
small watershed
Wenchuan earthquake
