Dynamic monitoring and analysis of the earthquake Worst-hit area based on remote sensing

Mingshun Xiang; Qiuchi Deng; Linsen Duan; Jin Yang; Chunjian Wang; Jiashuo Liu; Mengli Liu

Alexandria Engineering Journal (Nov 2022)

Dynamic monitoring and analysis of the earthquake Worst-hit area based on remote sensing

Mingshun Xiang,
Qiuchi Deng,
Linsen Duan,
Jin Yang,
Chunjian Wang,
Jiashuo Liu,
Mengli Liu

Affiliations

Mingshun Xiang: College of Tourism and Urban-Rural Planning, Chengdu University of Technology, Chengdu 610059, China; Research Centre for Human Geography of Tibetan Plateau and Its Eastern Slope, Chengdu University of Technology, Chengdu 610059, China
Qiuchi Deng: School of Geography, South China Normal University, Guangzhou 510631, China
Linsen Duan: College of Tourism and Urban-Rural Planning, Chengdu University of Technology, Chengdu 610059, China; Corresponding author.
Jin Yang: College of Tourism and Urban-Rural Planning, Chengdu University of Technology, Chengdu 610059, China; Research Centre for Human Geography of Tibetan Plateau and Its Eastern Slope, Chengdu University of Technology, Chengdu 610059, China
Chunjian Wang: College of Tourism and Urban-Rural Planning, Chengdu University of Technology, Chengdu 610059, China; Research Centre for Human Geography of Tibetan Plateau and Its Eastern Slope, Chengdu University of Technology, Chengdu 610059, China
Jiashuo Liu: College of Tourism and Urban-Rural Planning, Chengdu University of Technology, Chengdu 610059, China
Mengli Liu: College of Tourism and Urban-Rural Planning, Chengdu University of Technology, Chengdu 610059, China

Journal volume & issue: Vol. 61, no. 11
pp. 8691 – 8702

Abstract

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The earthquake and its secondary geological disasters have some long-term effects on vegetation recovery, and the spatiotemporal differentiation of vegetation coverage in earthquake-stricken areas are often not valued by researchers. Beichuan County in Sichuan Province is the worst-hit area during Wenchuan earthquake, tracking the vegetation coverage in this disaster area can provide feedback for post-earthquake ecological restoration. Based on remote sensing (RS) and Geographic information system (GIS), this paper relies on dimidiate pixel model (DPM) and vegetation coverage transfer matrix to explore the vegetation coverage of the earthquake worst-hit area. The results show that the overall level of vegetation coverage in Beichuan county is high, and earthquakes are dominant in the areas with high vegetation coverage. Besides, earthquake can do most severe damages to the areas with high vegetation coverage, followed by medium damage impacting to the areas with medium vegetation coverage, but the damage of other areas are relatively small. From 2007 to 2020, the average vegetation coverage in Beichuan County decreased from 0.835 in 2007 to 0.755 in 2008, then gradually recovered to 0.826 in 2020, experiencing a sharp decline and then a steady increase. The recovery of vegetation coverage is improved over time, but the spatiotemporal differences of the recovery process are obvious. Elevation has the largest driving force on vegetation coverage (q = 0.569, p less than 0.001), followed by temperature and rainfall; the interaction between factors has a significant increasement in the spatial differentiation of vegetation coverage, indicating that vegetation coverage is a combination result of multiple factors. The research findings can help construct the scientific management of the eco-environment in the disaster area, it can also help builda medium to long-term ecological restoration plan according to the variation in vegetation coverage.

Published in Alexandria Engineering Journal

ISSN: 1110-0168 (Print); 2090-2670 (Online)
Publisher: Elsevier
Country of publisher: Egypt
LCC subjects: Technology: Engineering (General). Civil engineering (General)
Website: http://www.journals.elsevier.com/alexandria-engineering-journal/

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