| The impact of natural disasters on environmental resources has gradually become one of the key research areas of Quaternary geology today.The Quaternary regional geological disasters and Quaternary environmental geology have become important research contents in the application of Quaternary geology.Jiuzhaigou geological relics are rich in landscapes,widely distributed,and diverse in type.They are characterized by karst lakes and waterfalls.They are known as the “fairy world”.As a world natural heritage site,a national geological park,and a national nature reserve,Jiuzhaigou has a very high Aesthetic value,scientific value and tourism value.The terrain in the scenic area is steep and the fault continues to be active,accompanied by multiple earthquakes,stratigraphic experience and tectonic movement.Influenced by the 7.0 Jiuzhaigou earthquake on August 8,2017,the gravity accumulation in the study area is frequently developed,and the distribution of Quaternary deposits is increased.A series of secondary geological disasters caused by the damage to the socio-economic and geological heritage landscape of the scenic spot were seriously damaged.This paper relies on the Jiu Zhaigou “ 8.8 ” earthquake geological relics landscape restoration,geological disaster investigation and restoration management project,and the “ Jiuzhaigou scenic geography landscape and seismic geological disaster risk analysis” as the topic,in the field investigation Jiuzhaigou scenic spot and collect relevant research results at home and abroad On the basis of the application of Quaternary geology theory and method combined with remote sensing space technology,the system compares and analyzes the development conditions,geological environment background,distribution law and main influencing factors of post-earthquake geological disasters in Jiuzhaigou,and uses the analytic hierarchy process(AHP).Calculate the correlation degree of the geological disaster system impact factors in the study area,construct the zoning of the geological hazard in the scenic spot,comprehensively judge the zoning results in combination with the disaster development status and the damaged ruins,and focus on the sparked sea as a serious damaged geological relic.Based on the research and analysis,the prevention andcontrol suggestions for the geological heritage landscape of Jiuzhaigou are proposed.The main research contents of this paper and the main conclusions and results obtained are as follows:(1)Based on the latest statistical data analysis and on-the-spot investigation of geological disasters in Jiuzhaigou scenic spot,before the “ 8.8 ” earthquake,72 geological disaster points were developed in the scenic spot;affected by the “8.8”earthquake,62 new geological disaster sites occurred in the scenic spot.At present,there are 134 geological disasters in the scenic area.According to the type of disasters,the main geological disasters in the area are collapse,mudslides,landslides and unstable slopes.Among them,there are 79 disaster sites and 25 mudslides.There are15 disaster points and 15 unstable slope disaster points.(2)At the same time,the selected slopes,slope directions,elevations,stratum lithology,distance to faults,and vegetation coverage are normalized for the post-earthquake study area,and the weights of each factor are calculated by the Analytic Hierarchy Process(AHP).The geological hazard susceptibility zoning in Jiuzhaigou core scenic spot was carried out after the earthquake,and the geological disaster susceptibility evaluation in Jiuzhaigou scenic spot was divided into high,middle and low-level susceptibility areas,accounting for 11.19%,29.46% and 59.35 respectively of the total area of the scenic spot.%.(3)The “8.8” earthquake in Jiuzhaigou has a great impact on some landscapes in the scenic area,while the Spark Sea is the most severely damaged and most varied landscape in the Jiuzhaigou scenic spot.Under the action of earthquakes,many dams in the Sparks collapsed and the travertines collapsed,resulting in a drop in water level,which greatly affected the aesthetics of the landscape.The sparkling sea landscape is temporarily in a fragile balance of relatively slow collapse.The trend of evolution shows that the collapse process will be accelerated if it encounters natural factors such as heavy rain and earthquake.(4)According to the comparative analysis of the secondary geological hazard data and the geological heritage landscape after the earthquake in the core scenic spot of Jiuzhaigou,under the background of the geological disasters such as collapse,mudslide and landslide in the study area,the precautions for the development of the scenic spot and the restoration of the scenic spot are proposed.Corresponding measures,according to the status quo of secondary geological effects after Jiuzhaigou earthquake,it is proposed to carry out disaster monitoring and early warning,as well as effective control of various geological disasters that have an impact on humanactivities in the study area.For the damaged geological heritage landscape points,it is necessary to follow the measures that do not destroy the original landscape and restore scientifically and reasonably.Protect the ecological environment of the scenic spot,ensure the economic benefits of tourism,and provide geological basis for the future sustainable economic development,people's life and security decisions. |
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