3D modelling of beach topography changes caused by the tombolo phenomenon using terrestrial laser scanning (TLS) and unmanned aerial vehicle (UAV) photogrammetry on the example of the city of Sopot

Abstract

In 2011, a yacht marina was built in Sopot (the largest holiday resort in Poland), which initiated the formation of a local shallowing of the bottom related to the tombolo effect. The building of the marina led to disturbances in the transmission of bottom deposits along the coast, which resulted from waves and the shift of the beach coastline by approx. 50 m towards the sea. Its effects include progressive morphological changes in the shore and the sea bottom, which will lead to the formation of a peninsula between the shore and the marina in the future. This paper presents the results of a comparative analysis of the accuracy of 3D modelling of the tombolo phenomenon in the onshore part of the beach using both point clouds obtained by terrestrial laser scanning methods and photogrammetric methods based on unmanned aerial vehicle photographs. The methods subjected to assessment include both those for land modelling and for determining the coastline course and its changes. The analysis results prove the existence of sub-metre differences in the imaged relief and the coastline course, which were demonstrated using an analysis of land cross-sections. The possibilities and limitations of both methods are demonstrated as well.

Research on the Use of Aerial Scanning and Gis in the Design of Sustainable Agricultural Production Extension Works in an Agritourist Farm in Romania

“…Even if the research did not require permanent marking of control points (temporary markings could be used), it was decided to materialize them for later use, in the design and execution of the works to extend the agritourist farm. For the easy recognition on photograms of the points marked on the ground, reference panels with a size of 50 × 50 cm, painted in two colors (white/red) [44][45][46][47] were made and used (by positioning centered on the ground markings). At the same time, for the areas that allowed, the marking was made directly on the ground, by applying a layer of paint (white, red).…”

Nghiên cứu chế độ bay UAV trong khảo sát địa hình công trình dạng tuyến - ứng dụng cho đoạn đường đê Xuân Quan, Hà Nội

“…Đã có rất nhiều ứng dụng UAV thu thập và thành lập tài liệu khảo sát địa hình nhằm xây dựng mô hình hiện trạng trong công tác thiết kế, quản lý, giám sát hạ tầng, giao thông [4][5][6]; nghiên cứu hình thái bề mặt đất và biến đổi nhiệt độ môi trường vùng bờ biển [7][8][9]; nghiên cứu về sự thay đổi địa mạo của các dòng chảy nhỏ trên bề mặt trái đất cùng sự xói mòn đất [10]. Ngoài ra cũng có nhiều nghiên cứu sử dụng công nghệ UAV ứng dụng trong việc mô phỏng lại bề mặt địa hình [1,11,12].…”

Structure-from-Motion-Derived Digital Surface Models from Historical Aerial Photographs: A New 3D Application for Coastal Dune Monitoring

“…A new possibility to gather long-term 3D datasets is now provided by the structurefrom-motion (SfM) methodology, which in coastal monitoring is mainly used to build 3D models from UAV-derived images [1,[14][15][16], especially to detect post-storm variations of the beach configuration [17][18][19]. In coastal monitoring, SfM techniques have also been applied using low cost cameras for terrestrial surveys of cliffs [20], using poles with the addition of multi-view stereo (MVS) techniques [21] or even kite-derived images [22,23].…”