汶川地震灾区道路损毁度遥感评估模型

Evaluation Model for Damage Extent of Roads in Wenchuan Earthquake-Stricken Areas Based on Remote Sensing Information

为满足地震发生后灾区交通设施损毁程度快速评价的需要,提出并建立了基于低空遥感影像的道路损毁度遥感评估模型.以低空遥感平台获取的地震灾区大比例尺真彩色遥感影像为信息源,提取灾区道路、桥梁和隧道洞口等交通构筑物的空间信息以及滑坡、崩塌、堰塞湖等灾害体的空间分布信息,形成崩塌、滑坡灾害分布和道路设施空间分布专题图.以道路设施与灾害体是否形成空间耦合作为道路损毁与否的判据,由灾害个体对道路设施结构破坏的严重程度生成道路受损系数,由单个受损段道路的长度生成规模系数,建立了灾区道路损毁程度遥感评估模型,并将该模型应用于都—汶路白沙至夏家坪段道路损毁程度评估,结果与实际情况一致.

A low-altitude remote sensing data-based evaluation model for damage extent of roads was proposed for rapid assessment of transport facilities in Wenchuan earthquake-stricken areas.Spatial information about roads,bridges,tunnel portals and spatial distributional information about landslides,collapses and barrier lakes were extracted from large-scale true-color images of Wenchuan earthquake-stricken areas gained from low-altitude remote sensing platforms,and the corresponding thematic maps were drawn.Spatial coupling of a road and disaster bodies was taken as the criterion to judge whether this road is damaged.The road damage coefficient was get from the damage level of road structures due to individual disaster body,and the damage scale factor was obtained from the length of individual damaged road.Based on the above parameters,an evaluation model was established for the damage extent of roads in Wenchuan earthquake-stricken areas.The damage extent of Baisha-Xiajiaping section of Dujiangyan-Wenchuan highway was obtained using this evaluation model.The obtained result is consistent with the actual situation.