Photogrammetry application to measurement of wave overtopping erosion progression through bare-clay

128

Survey

Monitoring the erosion formation and progression

The erosion study area was photographed with 10 GoPro Hero 9 cameras syncretized together. To provide full coverage of each test subsection (with dimensions of 4 m*3.5 m) as well as enough overlap between photographs, a fixed frame supporting ten cameras, was installed in the middle of the testing zone. Six cameras were installed over the entire width of the section over a horizontal rod. The rest four cameras were positioned on the lateral frame piers. On the other hand, to specify locations within the scene as well as to set up a coordinate system, some fixed points called Ground Control Points, were installed on the guiding channel walls of the section horizontally and vertically and their exact position was measured using the GPS. The cameras take pictures each second thanks to a pre-setting time-lapse mode including the initial and final situations for each wave's batch. Moreover, to guarantee sharp pictures of the ground surface instead of an invisible ground through the waves, after each wave batch the flow to the simulator is interrupted for 60 seconds.

Feb. 1, 2022, 3:03 p.m.

Feb. 7, 2022, 3:04 p.m.

XI

139727.0

226774.0

None

Two test strips BC1 and BC2 next to each other ; BC1 contains three subsections all tested under regular waves: BC1_1, BC1_2 and BC1_3; BC2 contains two sub-sections tested under Irregular waves.

Data type: Digital elevation models (DEM) in text format for all subsections at different moments.

Description: In order to understand the meaning of the names of files, one needs to know the waves overtopping experiments program; Regarding the test section BC1, the waves are regular and are addressed by their volume, which is released from the wave overtopping simulators. As an example: BC1_1_T1_Q200.xyz means the first subsection of the first test stretch, after the waves group of 200 l/m per wave. However, for test section BC2, that's the number of the waves that are important since the average volume remains constant.

Date availability: Jan. 31, 2030

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