湖北省黄冈市属于低山丘陵地区, 多发生小规模滑坡灾害, 降雨是诱发滑坡灾害最主要的外因之一, 分析降雨型滑坡各影响因素对滑坡数量贡献率的大小及其与雨量之间的关系, 对黄冈地区的防灾减灾具有重要作用。 利用2011—2020年黄冈市238个气象观测站雨量数据资料, 结合滑坡灾情数据, 分析了区内降雨型滑坡的区域性分布特点, 并根据月平均降雨量、 工程岩组和坡度对降雨型滑坡数量的贡献率, 将区内降雨型滑坡划分为高易发区、 中易发区和低易发区, 选择关键期日均降雨量与前期日均降雨量作为雨量阈值判定标准, 给出各个易发区在预报、 预警和警报3种状态下所对应的降雨量参考值, 为区域滑坡灾害防治提供了基础数据和科学依据。
Abstract
Huanggang City is located in a low mountainous and hilly area subjected to frequent small-scale landslide disasters. Rainfall is a major external cause of such landslide disasters. Analyzing the contributions of influencing factors to the number of rainfall-induced landslides and the relation between landslide and rainfall is of vital significance for the disaster prevention and mitigation in Huanggang. According to observation data of 238 meteorological stations in Huanggang from 2011 to 2020 together with landslide disaster data, the regional distribution of rainfall-induced landslide in Huanggang was examined. The contribution rates of monthly average rainfall, engineering rock formation, and slope gradient to the number of rainfall-induced landslides were obtained, and on such basis, the rainfall-induced landslides in the area were classified as highly susceptible, moderately susceptible, and lowly susceptible. Moreover, the reference values of rainfall corresponding to three levels, namely, forecast, early warning, and alarm were given with daily average rainfall in critical period and daily average rainfall in previous period as the rainfall threshold judgment criteria. The research findings offer basic data and scientific basis for the prevention and control of regional landslide disasters.
关键词
降雨型滑坡 /
雨量关系 /
贡献率 /
黄冈地区 /
易发区
Key words
rainfall-induced landslide /
relation with rainfall /
contribution rate /
Huanggang /
susceptible area
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基金
湖北省地质局2021年度科技项目(KJ2021-7)
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