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Arid Land Geography ›› 2019, Vol. 42 ›› Issue (3): 559-569.doi: 10.12118/j.issn.1000-6060.2019.03.12

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Model comparison of mountain torrent disaster risk assessment in different spatial scale

TIAN Feng1, ZHANG Jun2, RAN Youhua3, LIU Jinpeng4, ZHOU Yi2   

  1. 1 Faculty of Geographical Science,Beijing Normal University,Beijing 100875,China; 2 College of Resources and Environmental Sciences,Gansu Agricultural University,Lanzhou 730070,Gansu,China; 3 Northwest Institute of EcoEnvironment and Resources,Chinese Academy of Sciences,Chinese Academy of Sciences,Lanzhou 730000,Gansu,China; 4.Geological Natural Disaster Prevention Research Institute,Gansu Academy of Sciences,Lanzhou 730000,Gansu,China

  • Received:2018-12-01 Revised:2019-03-19 Online:2019-05-25 Published:2019-05-21

Abstract:

 This paper selected Hexi Corridor and Zhangye District,Gansu Province,China as the study zones with different spatial scale of geography division (large and medium scale,e.g.Hexi Corridor) and region (small scale,e.g. Zhangye District).Three popular models in assessing mountain torrent disaster including multicriterion model,MaxEnt model and information model were set as the study object.Based on the established risk assessment index system about mountain torrent disaster,the map of risk assessment on mountain torrent disaster for Hexi Corridor and Zhangye District was accomplished using the three models respectively.The model’s suitability was analyzed from the perspectives of the model validation,spatial autocorrelation,the precision comparison and the scale effect based on the statistics data about the geological disasters investigation and divisional reports in Gansu Province,and the preferred model was figured out.The result showed that MaxEnt model was the optimal model for risk assessment about mountain torrent disaster at the spatial scale of geography division.The multicriterion model wasn’t suitable at the spatial scale of region,and the results from three models for Zhangye District were not as good as those for Hexi Corridor.The scale effect of the three models was extremely obvious, and the application effect at the spatial scale of Hexi Corridor was better than that at the spatial scale of Zhangye District.The MaxEnt model was superior to the multicriterion decision model and the information model regardless of the spatial scale,and can be used to support the monitoring, prewarning and protection engineering projects about mountain torrent disaster in Hexi Corridor.

Key words: mountain torrent disaster, risk assessment, spatial scale, model adaptation, model comparison