Abstract
The region between Xi’an and Lanzhou is the first and most important part of the so-called Silk Road in China. However, this section is highly susceptible to geohazards, including landslides, debris flows, etc., as a result of complex geological formations, steep landforms, seasonal heavy rainfall, and intensive anthropogenic activity that characterize this region. These geohazards have resulted in significant damage to the local infrastructure and economy and are becoming increasingly frequent with time. To identify the distribution of characteristics of geohazards and susceptibility zoning in this region, a frequency analysis and logistic analysis were used to study the spatial distribution of geohazards. The key factors of surface topography and geology associated with geohazards were considered, including slope gradient, height differential, profile curvature, slope aspect, and rock hardness. First, the distribution and frequency of geohazards were discussed in relation to the five factors. Second, each factor’s influence was evaluated by logistic regression and the relative importance of each of the variables was discussed. Finally, geohazard susceptibility zoning was mapped using logistic regression and geography information system tools. The results of the susceptibility zoning model were validated using the locations that had recorded geohazards in recent decades; the accuracy of the model was greater than 86.8 %. The model validation proved that there was good agreement between the susceptibility mapping and historically recorded geohazards. The logistic regression model produced acceptable results using a receiver operating characteristics curve in which the total area under the receiver operating characteristics curve was 0.879. The results of this study can assist in preliminary planning for land use, particularly with reference to construction projects in high risk areas.
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Acknowledgments
The authors are very grateful to the anonymous reviewers and editors for their thoughtful review comments and suggestions which have significantly improved this paper. The authors wish to thank Prof. Chen Wenwu, Prof. Han Wenfeng for their contributions and involvement in the field investigations. We would also like to express our gratitude to the academic and technical staff of the Institute of Geohazards Mitigation and Research of Chang’an University, China. This study was financially supported by the National Basic Research Program of China (No. 2014CB744703), the National Natural Science Foundation of China (Grant Nos. 41572272 and 41130753) and the State Key Laboratory Program of SKLGP (Grant No. SKLGP2016K002).
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This article is a part of a Topical Collection in Environmental Earth Sciences on “Advances of Research in Soil, Water, Environment, and Geologic Hazards along the Silk Road” guest edited by Drs. Peiyue Li Hui Qian and Wanfang Zhou.
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Zhuang, J., Peng, J., Zhu, X. et al. Spatial distribution and susceptibility zoning of geohazards along the Silk Road, Xian-Lanzhou. Environ Earth Sci 75, 711 (2016). https://doi.org/10.1007/s12665-016-5428-5
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DOI: https://doi.org/10.1007/s12665-016-5428-5