An earthquake in the Jiuzhaigou area caused numerous secondary disasters, such as rolling stones, land collapse, landslides and debris flow, which badly affected the safety of human settlements and influenced the spatial layout of the post-disaster reconstruction. Therefore, carrying out assessments of land and identifying a suitable zone for human habitats were very important. This research creates the territorial suitability assessment and function zoning conceptual model in the earthquake-stricken area, and the new methods of the territorial suitability evaluation system were used to divide the spatial functional zones of the earthquake stricken area, which provide a theoretical guidance and decision-making basis for the reconstruction of the disaster area. The results showed that: (1) The Jiuzhaigou earthquake-stricken area comprises of an ecological area that has a high level of importance to the ecosystem. In the earthquake-stricken area, 65% of national land is at an altitude of 3000–4000 m, and therefore not suitable for a high level of intensive reconstruction, but reconstructed in an eco-friendly manner. (2) The zone suitable for reconstruction comprises mainly of the river valley and the flat terrain of western parts. The land with low suitability is mainly located on steep terrain, such as high mountains and low gullies. The geographic and geomorphic conditions limit the spread of a suitable reconstruction zone. (3) The earthquake-stricken area mainly comprises of a tourism industry gathering area, population gathering area, agriculture and animal husbandry development area, and ecological preservation area with areas of 76 km2, 44 km2, 1591 km2 and 7512 km2, respectively. Scientifically zoning the reconstruction areas using scientific evaluation may provide guidance for the location of reconstruction sites.
Jiuzhaigou valley Earthquake-stricken area Territorial suitability Function zoning
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The research was supported by the National Science and Technology Major Project for Water Pollution Control and Treatment (Grant No. 2017ZX07101001), National Natural Science Foundation of China (Grant NO.41671529), the Hundred Young Talents Program of the Institute of Mountain Hazards and Environment (Grant No. SDSQB-2015-01), the Monitoring and Warning Program for Resources and Environment Carrying Capability in Sichuan Province (Grant No. ZXGH201709), the Program for Resource and Environment Carrying Capability in JiuZhaiGou Earthquake Disaster Area (Grant No. Y7K2190190).
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