Dynamic monitoring of remote sensing by Chinese Academy of Sciences： The risk of dammed lake in Wenchuan earthquake area has been basically eliminated.

　　China news agency, Beijing, May 5 (Reporter Sun Zifa) The Institute of Remote Sensing and Digital Earth of the Chinese Academy of Sciences announced on the 5 th that the work of "Dynamic Remote Sensing Monitoring for the 10th Anniversary of Wenchuan Earthquake" initiated by the Institute has been basically completed, and a series of important monitoring, analysis and evaluation results have been achieved in the Wenchuan earthquake area, such as "major landslides and debris flow disasters", "monitoring of dammed lakes", "monitoring of ecological restoration" and "reconstruction of towns in disaster areas". Among them, monitoring of dammed lakes shows that by 2018,

　　2018 marks the 10th anniversary of the Wenchuan earthquake. In order to systematically monitor the environmental changes and post-disaster reconstruction progress in the earthquake-stricken areas in the past 10 years, the "Earth Big Data Science Project", a strategic pilot project of the Chinese Academy of Sciences, launched the "Dynamic Monitoring of the 10th Anniversary of the Wenchuan Earthquake by Remote Sensing" in March. Based on the multi-temporal and massive satellite data in the past 10 years and the aerial observation data obtained by high-altitude remote sensing aircraft and drones, researchers have comprehensively evaluated the ecological environment recovery process in the earthquake-stricken areas through spatial remote sensing.

　　In terms of monitoring of dammed lakes, 36 major dammed lakes in Wenchuan earthquake zone were continuously monitored. By 2013, after five years of engineering risk removal, natural burst and overflow erosion, 30 dammed lakes had been completely dredged and 6 were not completely dredged. Using high-resolution satellite and aerial remote sensing images, the researchers conducted remote sensing monitoring on the status quo of the unclogged dammed lake again, and the results showed that the dam body of the unclogged dammed lake was stable.

　　Researchers have estimated that by 2018, the risk of dammed lake in Wenchuan earthquake zone has been basically eliminated, the dam body of Tangjiashan dammed lake, the largest, has been stabilized, and the downstream river has been dredged, which has become a scenic spot and an important water conservancy facility, and basically solved the impact of dammed lake on the lives of local residents. It is suggested to further scientifically plan related dammed lakes and develop characteristic tourism.

　　In terms of major landslides and debris flow disasters, the monitoring of five large-scale landslide groups shows that by 2018, the vegetation coverage of landslide bodies in each large-scale landslide group has recovered in good overall condition, and the intensity of landslide activity has shown an obvious downward trend. In the past 10 years, the activity of geological disasters has been reduced by taking corresponding protective measures such as slope cutting and unloading and vegetation restoration in Wenchuan earthquake area. Researchers reminded that new landslide disasters still exist, and it is necessary to continuously identify and monitor disaster risks.

　　In the aspect of ecological restoration monitoring, the dynamic monitoring and evaluation results of Wenchuan earthquake area and Sichuan giant panda habitat show that the vegetation coverage has been significantly improved after the earthquake, and the soil erosion has also been gradually improved. It is suggested to continue to maintain ecological restoration measures, reduce vegetation destruction and soil erosion, and support the sustainable and benign restoration of ecological environment and giant panda habitat.

　　In terms of urban reconstruction in disaster areas, researchers extracted and analyzed the current situation of building areas in Shifang, Mianzhu and Anxian (now Anzhou District), which were the hardest hit areas of house collapse. They thought that the reconstruction of disaster areas, standardized urban construction and modern public facilities construction had achieved remarkable results, and suggested strengthening the implementation of urban planning, preventing unreasonable and unscientific construction, taking into account the coordinated design of ecological protection and disaster reduction, and forming sustainable urban construction and development capabilities.