Abstract
Mountainous vegetation recovery after major earthquakes has been significant for preventing post-seismic soil erosion and geo-hazards. Magnitude 7.9 Wenchuan earthquake struck western Sichuan, China in 2008, caused salient number of geological hazards and caused major vegetation damage. This recovery process could be a very long and fluctuating. And Remote sensing has been an important method of vegetation restoration monitoring. This study aims to use remote sensing technology data to analyze the post-seismic vegetation damage and recovery situation of the 2008 Wenchuan earthquake over years to 2020, and find the relevant factors affecting the restoration of ecological vegetation. This paper examined the vegetation recovery processes following the 2008 Wenchuan earthquake using 16-day interval MODIS normalized difference vegetation index time series from 2000 to 2020. It has been found that the vegetation recovery rate generally increased by years, the entire study area has recovered 49.89% by 2020. In addition, by combining remote sensing imagery and geographic information data, we also found that the heavily affected vegetation areas are mainly located along the southern part of the earthquake surface rupture, where have a very high slope which mainly over 60 degrees. It makes this part having higher probabilities to experiences secondary natural hazards and a fluctuating vegetation recovery rate. Through this research, it can be concluded that remote sensing is an effective method for monitoring vegetation dynamics in a long series. For soil and soil retention and ecological vegetation protection of landslides after the earthquake, it should be more concerned about the areas where have steep slope that over 60 degrees.
Highlights
Vegetation damage is a major threat for ecology system maintaining; and earthquake is a big cause of vegetation damage. 2008 Wenchuan earthquake, triggered a large number of secondary hazards such as landslides, affecting hundreds of square kilometers, damaging a vast area of vegetation by denuding, burying, or completely removing the local vegetation
The principal feature of these methods involves comparing the difference in vegetation conditions of the pre and post seismic vegetation index using a limited number of images
The mountainous terrain and the relatively steep slope in the county may cause a second deterioration to the plants
Summary
Vegetation damage is a major threat for ecology system maintaining; and earthquake is a big cause of vegetation damage. 2008 Wenchuan earthquake, triggered a large number of secondary hazards such as landslides, affecting hundreds of square kilometers, damaging a vast area of vegetation by denuding, burying, or completely removing the local vegetation. Vegetation damage is a major threat for ecology system maintaining; and earthquake is a big cause of vegetation damage. 2008 Wenchuan earthquake, triggered a large number of secondary hazards such as landslides, affecting hundreds of square kilometers, damaging a vast area of vegetation by denuding, burying, or completely removing the local vegetation. Following the Wenchuan earthquake, some studies were performed to assess the vegetation recovery. Ali and Xuanmei etc assessed the regrowth of post-seismic vegetation in the landslide damaged areas using MODIS data and concluded that landslide activity may return to the pre-earthquake level within 18 years [1]. The principal feature of these methods involves comparing the difference in vegetation conditions of the pre and post seismic vegetation index using a limited number of images
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