区域滑坡易发性评价的时间尺度特征分析

Characteristics of Temporal Scale of Regional Landslides Susceptibility Assessment

滑坡灾害是一种具有时空尺度属性的环境地质问题。以往对于滑坡易发性研究的尺度特征分析主要集中于由滑坡灾害本身及其影响因素的空间非均质性产生的空间效应。监测数据作为滑坡的信息载体,不仅包括了滑坡的空间分布信息,而且一定时间序列的监测数据也包含滑坡在时间上的演变信息,因此滑坡监测数据的时序性分布特征是滑坡易发性研究的时间效应的重要表征。探讨了滑坡监测数据的时序性分布特征对滑坡易发性研究的影响,通过对具有不同地质环境条件研究区的滑坡进行分析,总结出了4种典型的滑坡演变类型,对于修正滑坡易发性评价方法与思路、提高评价结果精度具有一定的意义。

Landslide hazard is a environmental geological problem which includes the properties of scale.The previous study on the scale of landslides susceptibility was mostly focused on spatial effects which caused by the spatial heterogeneity of landslide and its influencing factors.As the information carrier,monitoring data of landslides not only contains the space distribution information of landslides,but also contains the evolution information of temporal scale.Thus the temporal distribution characteristics of monitoring data are the very important characterization of temporal scale of landslides susceptibility research.The paper discussed the influence of temporal distribution characteristics of monitoring data to the landslide susceptibility research and summarized 4 typical landslide evolution types in China through analyzing the landslide in different study areas with different geological and environmental conditions.It had a certain significance to modifying the evluation method and trian of thought of landslide susceptibility and improving the accuracy of assessment result.