Abstract
Penghu islands, in the southern Taiwan Strait, is a remnant of a middle-late Miocene basaltic shield volcano. We present a procedure to use UAV (Unmanned Aerial Vehicles) to perform photogrammetry survey and monitoring analysis in beach evolution scenarios. The aim of this study is to understand spatial-temporal change along the sandy beach in Penghu islands, especially as for the effects of typhoon and coastal structures. According to the study result, this example of application is provided to show the results and the potential of this methodology in real beach changes. In addition, we found the typhoon and coastal structures play important roles to shape the beach morphology and its evolution. The result of beach monitoring reveals that the reduction and change of sand volume in Shanshui beach resulted from the placement of detached breakwater complexes. This coastal structure likely resulted in the development of tombolo and therefor make the beach unstable and subject to conduct rip current and more erosion.
Highlights
This study is to conduct the applicability of Unmanned Aerial Vehicle (UAV) in monitoring beach landscape
The availability of Digital Surface Models (DSM) at high resolution and accuracy is very useful for the landscape monitoring by 3D reconstruction of the terrain
Beach landscape has been formed by coral, seashell, and rock sand deposited by sea currents in bay areas where the currents moderate
Summary
This study is to conduct the applicability of Unmanned Aerial Vehicle (UAV) in monitoring beach landscape. The islands are buffeted by strong northeasterly monsoons, and exposed rock has been weathered away in layers, like onions. The action of the wind has blown sand over higher areas and deposited it on the leeward slopes of those areas, forming dunes. Beach landscape has been formed by coral, seashell, and rock sand deposited by sea currents in bay areas where the currents moderate. Owing to numerous tourists and the accompanying coastal structure may result in the degradation of beach recreational function. This study selects a popular local beach (Shanshui beach) to conduct a comprehensive investigation of beach degradation, in order to facilitate the effective management
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