Citation: | HUANG Cheng, WU Nengyou, LONG Junqiao, TANG Wei, XIN Zhuo, LUO Shenglong, HU Xuan, YAN Li, XING Jingfeng, CHEN Long, ZHANG Yunzhong, GUO Zejun, LI Yang. Comprehensive geological survey and research on Wuzhizhou Island of Sanya City based on UAV tilt photography technology[J]. Marine Geology & Quaternary Geology, 2023, 43(3): 195-208. doi: 10.16562/j.cnki.0256-1492.2022092801 |
It is extremely difficult to carry out comprehensive geological surveys on uninhabited island due to factors such as inconvenient transportation, lush vegetation coverage, and steep terrain. To overcome the shortage in in-situ investigational staff, reduce safety risks, and improve the working efficiency, the UAV (manned aerial vehicle) tilt photography technology was applied and tested in the Wuzhizhou Island, Hainan Province. A FEIMA D20 UAV carries a D-OP3000 module that equipped with 5 lens with which low-altitude (190m), multi-angle, and high-precision image data could be obtained quickly. The average ground resolution of the image was finer than 0.03m. In addition, Smart3D software was used to generate digital orthophoto maps (DOM) and to build a real-scene 3D model of the island. Therefore, the island could be observed in an omnidirectional way, and the overall understanding of the island was enhanced. Combined with a comprehensive study of digital orthophoto maps, the real-scene 3D model and field investigation, and the linear fracture characteristics of Wuzhizhou Island were obtained, and its origination was explored. The information of current status of land development and utilization of the island was extracted and 15 hidden risk points of geological disasters were spotted, including costal bluff collapse, fault activity, and beach erosion, to which countermeasures were proposed. This study provided a scientific basis for island development and utilization, ecological protection and restoration, geological disaster management, and comprehensive management of the islands alike.
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Geographical location of the study area
Route planning of the UAV tilt photographing
3D real scene model of the Wuzhizhou Island
Distribution of linear fracture in Wuzhizhou Island
Basic dykes developed in southeast of the Wuzhizhou Island
Different development stages of spherical weathering alone the coastal Wuzhizhou Island
Coastline types and spatial distribution of the Wuzhizhou Island
Sandy beach of the northern Wuzhizhou Island
Sandy beach with pebbles and cobbles in the Yazhou Bay
Current situation of land development and utilization in the Wuzhizhou Island
Distribution of geological hazards in the Wuzhizhou Island
A hidden risk point of bluff collapse on the eastern side of the Wuzhizhou Island
A hidden risk point of bluff collapse in the southern Wuzhizhou Island
An erosion section of rocky beach on the eastern side of Wuzhizhou Island
A siltation section of sandy coastline in the northern Wuzhizhou Island
Sketch of a tensional fracture in near S-N direction in the southeastern side of Wuzhizhou Island
Identification of island trace line in sandy coastline
The coastline changes of the Wuzhizhou Island since 2005