基于偏序集的地震滑坡危险性判别方法

Identification Method of Earthquake Landslide Based on the Poset

为了对地震滑坡危险性作出准确评估,将融合权重信息的偏序集引入到地震滑坡危险性评价中,提出一种具有强鲁棒性的判别方法,为滑坡灾害预防与减灾提供新的思路。以偏序集理论为模型基础,以地震滑坡危险性Hasse图为识别工具建立偏序集评价模型。根据地震滑坡形成机理,选取岩石风化系数、地震烈度、断裂带密度、河网密度、相对高度、>25°山坡面积分数6个指标作为地震滑坡危险性评价的主要影响因子并确定其危险等级划分标准。应用偏序集判别模型,通过Hasse矩阵绘制Hasse图,以图的形式呈现各样本之间的传递关系、结构关系、聚类情况,并根据高度值计算结果,最终判定各待评样本危险等级。结果表明,10个待评样本具有不同程度的地震滑坡危险性,各地震滑坡危险程度从大到小依次为样本A_(3)、A_(8)、A_(4)、A_(9)、A_(5)、A_(7)、A_(10)、A_(2)、A_(6)、A_(1)。预测结果与滑坡灾情吻合,该模型应用于地震滑坡危险性评价中是可行的、有效的。

In order to accurately assess the earthquake landslide risk,the poset of fusion weight information is introduced into the earthquake landslide risk assessment,and a discriminant method with strong robustness is proposed,which provides a new idea for landslide disaster prevention and mitigation.Based on the poset theory model,the poset evaluation model is established with the seismic landslide hazard Hasse diagram as the identification tool.According to the formation mechanism of earthquake landslides,six indexes,including rock weathering coefficient,seismic intensity,fault zone density,river network density,relative height,and 25°hillside area fraction,are selected as the main influencing factors for earthquake landslide risk assessment,and the classification standard of its risk level is determined.By applying the poset evaluation model,the Hasse diagram is drawn through the Hasse matrix,and the transfer relationship,structural relationship,and clustering between the samples are presented in the form of a diagram,and the result is calculated according to the height value,so the final step is to judge the hazard level of each waiting evaluation sample.The results show that the 10 waiting evaluation samples have different degrees of seismic landslide risk,and the sample degree order of seismic landslide risk from high to low is A_(3)、A_(8)、A_(4)、A_(9)、A_(5)、A_(7)、A_(10)、A_(2)、A_(6)、A_(1).The predicted results are consistent with the landslide disaster situation,and the model is feasible and effective when applied to earthquake landslide risk assessment.