Abstract
Landslides are one of the most frequent and serious geological disasters that threaten people’s lives and property safety. In recent years, with the rapid development of the coastal economy and the increasingly strained spatial resources, the island development activities have become extremely rapid, resulting in the frequent occurrence of landslides on the island. We selected Beichangshan Island in the north of China as the research area. By using high-precision ground-based real aperture radar (GB-RAR) measurement technology, the displacement changes of potential landslides are monitored continuously and dynamically to realize the real-time diagnosis and early warning of island landslides. At the same time, the data interpretation method and key processing flow are described in detail. The results show that during the whole monitoring process, an area of obvious change is found, which is mainly located in the middle of the landslide mass. The mean velocity rate shows a nonlinear deformation trend. The maximum deformation of the landslide in the five selected points reaches 4.5 mm, which indicates that the area is in an unstable stage. The deformation monitoring ability of GB-RAR technology to identify the sub-millimeter level is demonstrated, and the monitoring method is verified. The validity and reliability of the method can be applied to real-time dynamic fine deformation diagnosis of island landslides. Its accuracy can meet the needs of dynamic change monitoring of island landslides, and it can become an important tool and means for early warning and treatment of landslides. The research is conducive to further enriching and improving the monitoring method system of island geological disasters in China, provides a scientific basis and technical support for early warning and disaster prevention and mitigation of island landslides, and can be popularized and applied in the monitoring of island landslides.
Highlights
An island is surrounded by the sea
interferometric synthetic aperture radar (InSAR) technology is suitable for the identification of hidden danger points and the investigation of dangerous situations in a large range of geological disasters, but it is limited by the low spatial resolution, fixed revisit period, and long-time baseline, so it has some limitations on the timeliness of landslide deformation emergency monitoring
Compared with ground-based InSAR (GB-InSAR), ground-based real aperture radar (GB-RAR) uses real aperture radar (RAR), which has the advantages of wide scanning angle, large measuring range, and long monitoring distance [21]
Summary
An island is surrounded by the sea. With its special location, environment, resources, and other advantages, it has gradually become an important support for the development of the marine economy and the expansion of the marine industry. With the rapid development of the coastal economy and the increasing shortage of space resources, island development activities have become extremely rapid in the past 20 years, resulting in frequent occurrence of geological disasters such as island landslides. InSAR technology is suitable for the identification of hidden danger points and the investigation of dangerous situations in a large range of geological disasters, but it is limited by the low spatial resolution, fixed revisit period, and long-time baseline, so it has some limitations on the timeliness of landslide deformation emergency monitoring. Ground-based real aperture radar (GB-RAR) interferometry has become a new ground deformation monitoring method with real-time, dynamic, all-weather, high-resolution, and continuous space coverage characteristics. Compared with ground-based InSAR (GB-InSAR), GB-RAR uses real aperture radar (RAR), which has the advantages of wide scanning angle, large measuring range, and long monitoring distance [21]. The GB-RAR interferometry technique has proved its ability to be suitable for monitoring landslides
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