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Frontiers of Earth Science

ISSN 2095-0195

ISSN 2095-0209(Online)

CN 11-5982/P

Postal Subscription Code 80-963

2018 Impact Factor: 1.205

Front. Earth Sci.    2015, Vol. 9 Issue (3) : 449-462    https://doi.org/10.1007/s11707-014-0474-3
RESEARCH ARTICLE
Identification of landslide spatial distribution and susceptibility assessment in relation to topography in the Xi’an Region, Shaanxi Province, China
Jianqi ZHUANG1,2,Jianbing PENG1,2,*(),Javed IQBAL3,4,Tieming LIU2,Na LIU2,Yazhe LI1,Penghui MA1
1. School of Geological Engineering and Surveying of Changan University, Key Laboratory of Western China Mineral Resources and Geological Engineering, Xi’an 710054, China
2. Institute of Geo-hazards Mitigation of Chang’an University, Xi’an 710054, China
3. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
4. Department of Earth Sciences, COMSATS Institute of Information Technology, Abbottabad, Pakistan
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Abstract

Landslides are among the most serious of geohazards in the Xi’an Region, Shaanxi, China, and are responsible for extensive human and property loss. In order to understand the distribution of landslides and assess their associated hazards in this region, we used a combination of frequency analysis, logistic analysis, and Geographic Information System (GIS) analysis, with consideration of the spatial distribution of landslides. Using the GIS approach, the five key factors of surface topography, including slope gradient, topographic wetness index (TWI), height difference, profile curvature and slope aspect, were considered. First, the distribution and frequency of landslides were considered in relation to all of the five factors in each of three sub-regions susceptible to landslides (Qin Mountain, Li Mountain, and Loess Tableland). Secondly, each factor’s influence was determined by a logistic regression method, and the relative importance of each of these independent variables was evaluated. Finally, a landslide susceptibility map was generated using GIS tools. Locations that had recorded landslides were used to validate the results of the landslide susceptibility map and the accuracy obtained was above 84%. The validation proved that there is sufficient agreement between the susceptibility map and existing records of landslide occurrences. The logistic regression model produced acceptable results (the areas under the Receiver Operating Characteristics (ROC) curve were 0.865, 0.841, and 0.924 in the Qin Mountain, Li Mountain and Loess Tableland). We are confident that the results of this study can be useful in preliminary planning for land use, particularly for construction work in high-risk areas.

Keywords landslide distribution      susceptibility assessment      logistic model      ROC      Xi’an     
Corresponding Author(s): Jianbing PENG   
Online First Date: 21 January 2015    Issue Date: 20 July 2015
 Cite this article:   
Jianqi ZHUANG,Jianbing PENG,Javed IQBAL, et al. Identification of landslide spatial distribution and susceptibility assessment in relation to topography in the Xi’an Region, Shaanxi Province, China[J]. Front. Earth Sci., 2015, 9(3): 449-462.
 URL:  
https://academic.hep.com.cn/fesci/EN/10.1007/s11707-014-0474-3
https://academic.hep.com.cn/fesci/EN/Y2015/V9/I3/449
Fig.1  Landform characteristics of the Xi’an Region (left) and landform cross-section (right); (a) A?A′ cross-section; (b) B?B′ cross-section.
Fig.2  Simplified geological map of the four sub-regions in Xi’an, China.
Fig.3  Flowchart of landslide susceptibility analysis
Sub-region Number of landslides Geology
Loess Tableland 49 Loess deposits.
Li Mountain 63 1?2 layers of loess on the surface, overlying mudstone and conglomerate rock.
Qin Mountain 166 Metamorphic rocks.
Tab.1  The landslide frequencies in the three sub-regions in Xi’an and their geological characteristics
Fig.4  Frequency distribution of landslides in different classes of slope gradients in the three sub-regions of Xi’an. LSA grid (%): percent of each grid affected by landslides; Grid (%): percentage of grids in the domain; FR: percent of total grids affected by landslides; (a) Qin Mountain; (b) Li Mountain; (c) Loess Tableland.
Fig.5  Frequency distribution of landslides in different slope aspect classes in the three sub-regions of Xi’an. LSA grid (%): percent of each grid affected by landslides; Grid (%): percent of grids in the domain; FR: grids affected by landslides as a percentage of all grids; (a) Qin Mountain; (b) Li Mountain; (c) Loess Tableland.
Fig.6  Frequency distribution of landslides in different TWI classes in the three sub-regions of Xi’an. LSA grid (%): percent of each grid affected by landslides; Grid (%): percent of grids in the domain; FR: grids affected by landslides as a percentage of all grids; (a) Qin Mountain; (b) Li Mountain; (c) Loess Tableland.
Fig.7  Frequency distribution of landslides in different profile curvature classes in the three sub-regions. LSA grid (%): percent of each grid affected by landslides; Grid (%): percent of grids in the domain; FR: grids affected by landslides as a percentage of all grids; (a) Qin Mountain; (b) Li Mountain; (c) Loess Tableland.
Fig.8  Frequency distribution of landslides in different height difference classes in the three sub-regions of Xi’an. LSA grid (%): percent of each grid affected by landslides; Grid (%): percent of grids in the domain; FR: grids affected by landslides as a percentage of all grids; (a) Qin Mountain; (b) Li Mountain; (c) Loess Tableland.
Predicted Percentage accuracy/%
0 1
(a) Qin Mountain Observed 0 55 8 87.30
1 10 53 84.12
Overall percentage 85.71
(b) Li Mountain Observed 0 43 6 87.75
1 4 45 91.84
Overall percentage 89.75
(c) Loess Tableland Observed 0 150 16 90.36
1 13 153 92.17
Overall percentage 91.26
Tab.2  Correlation between the percentage of actual landslides and the predicted probability of landslides
Fig.9  ROC curve. Results are described in the text. (a) Qin Mountain; (b) Li Mountain; (c) Loess Tableland.
Qin Mountain Li Mountain Loess Tableland
Very low class 15.24% 15.55% 63.07%
Low class 18.24% 29.13% 19.10%
Medium class 17.44% 23.56% 8.39%
High 20.59% 18.62% 5.08%
Very high class 28.48% 13.15% 4.35%
Tab.3  Landslide distributions in different susceptibility classes
Fig.10  Susceptibility map generated from the logistic regression model for the three sub-regions in Xi’an, China. (a) is the Qin Mountain; (b) is the Li Mountain; (c) is the Loess Tableland.
Fig.11  Susceptibility map converted to a KML shape overlaid on Google Earth.
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