Landscape Changes And Tourism Development Of The Earthquake Site Of The Tang Jiashan Quake Lake

The earthquake site of the Tang Jiashan quake lake is the most famous quake lake site in the"5.12"Wenchuan great earthquake.After the successful discharge of the risk,Beichuan County intends to build it into an earthquake ruins tourist destination.In the imminent arrival of the"5.12"Wenchuan great earthquake 10th anniversary,through the study and analysis of the changes in the 9 years of the earthquake site of the Tang Jiashan quake lake site after the earthquake,this paper evaluates the conditions for the development of the earthquake site landscape tourism and discusses its tourism development potential,so as to provide reference for further development of the earthquake ruins tourism.This paper uses four total remote sensing images in the area of the earthquake site of the Tang Jiashan quake Lake for comparative study,such as two phases of Landsat and 5 TM remote sensing images in July 2008 and May 2011,and two phases of Landsat 8 TM remote sensing images in June 2014 and July 2017.In ENVI,by carrying out the geometric correction,atmospheric correction,fusion,cropping,image enhancement,supervised classification and visual interpretation of remote sensing images,this paper finally got the data of 6 types of surface types and cover area data of bare land,river waters,woodland and grassland,sand and beach land,building road and cultivated land in the area of the earthquake site of the Tang Jiashan quake Lake.By making a comparative study on the classified images and area statistics with3 years as one phase,this paper analyzes the changes in the landscape of the earthquake sites in the earthquake site of the Tang Jiashan quake lake.At the same time,through AHP analytic hierarchy process,this paper makes a comprehensive evaluation of the tourism development conditions of the changed landscape of the earthquake site of the Tang Jiashan quake lake,and further explores the influence factors and tourism development potential of the landscape tourism development of the earthquake site of the Tang Jiashan quake lake.Through the study,it is found that:(1)water coverage area of the area of the earthquake site of the Tang Jiashan quake Lake gradually shrank from 4.523km~2 in the two months after the earthquake to 2.195km~2 in July 2017.Except for the waters from Xuanping Township quake lake to landslide dam,the coverage area of the Jian river waterway waters from Xuanping Township to Yuli Township basically recovered to the level before the earthquake.In contrast to the area covered by water,there are more new river heart beach and riparian beach landscapes in the river channel of the area of the earthquake site of the Tang Jiashan quake Lake because of the decrease of water level and the deposition of sediment for 9 years.(2)Although it is greatly affected by geological disasters,the total area of mountain bare land exposed by earthquakes in the area of the earthquake site of the Tang Jiashan quake Lake presents a trend that increases first and then decreases during the 9 years.However,by the end of July 2017,the area of bare land in the area of the earthquake site of the Tang Jiashan quake lake has been reduced by 3.161 km~2 compared with that in July 2008.The collectivity shows the alternation trend of the old and the new.Nevertheless,vegetation coverage is negatively correlated with the change of bare land.The whole vegetation cover change showed a trend of decreasing first and then increasing gradually.(3)Changes in the landscape of the earthquake site of the Tang Jiashan quake lake depends mainly on the stability of geological conditions in the area.Among them,geological disasters such as earthquakes,landslides,landslides and debris flows have a strong impact on tourism development in the region.The most important factor in tourism development in this area is disaster impact.Therefore,in order to ensure the tourism development of the landscape of the earthquake ruins of the Tang Jiashan quake lake,the impact of geological hazards in the region must be emphasized,and effective measures should be taken for investigation,prevention and disposal.(4)Because of the advantages,such as high reputation,high scientific research value and science popularization value,a gradual and better vegetation cover,and high quality of water and air in the"5.12"Wenchuan great earthquake site.And since 2011,the geological environment in this region is gradually stabilized,and the frequency of disasters gradually tends to the level before the earthquake.Therefore,the earthquake site of the Tang Jiashan quake lake has a certain potential for tourism development.