Everything about Photogrammetry application to measurement of wave overtopping erosion progression through bare-clay
id;activity_name;activity_type;activity_descriptor;breaching;animal;erosion;temporary;levee_survey;prolonged;start_date;end_date;date_length_day;date_length_hour;date_other;levee_stretch;location_x;location_y;location_z;location_descriptor;location_other;objectif_important;objectif_knowledge;pre_condition;act_des;monitoring_process;monitoring_reasoning;limits;during_activity;post_activity;activity_result;results_conc;knowledge_desc;ref_links;wrk_1;wrk_2;wrk_3;key_info
128;Photogrammetry application to measurement of wave overtopping erosion progression through bare-clay;Survey;"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.";True;False;True;False;False;False;2022-02-01 15:03:00;2022-02-07 15:04:00;5;;;XI;139727.0;226774.0;;"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.";;Monitoring the erosion formation and progression;"Improve the knowledge regarding the clay  resistance under the influence of waves overtopping the levee; and consequently determining the levee protective layer failure;
Providing the data to validate the existing models;
Validating and improving existing concepts aimed at explaining the breach formation and development in cohesive soils.
etc.";The grass was removed over a section of 3.5m x 4m wide, and a depth of 20 cm using a crane.;Cameras had taken photos at one-second intervals over the whole test duration. The analysis of photos is done at meaningful intervals i.e. either between wave groups for regular waves or after a certain number of waves, for irregular waves.;"10 GoPro Hero 9 cameras; RTK GPS; Agiosoft Metashape software";;The main hindrance is the water. The fact that water fills the holes and erosion pits reduces the visibility of these areas and makes the cameras less capable of capturing the bottom, diminishing the accuracy of the photogrammetry in these areas.;;"Photogrammetry analyses are done for all subsections over last months.
.";;The results are available for all subsections.;;;True;False;False;


All DATA concerning Photogrammetry application to measurement of wave overtopping erosion progression through bare-clay
data_type;data_descripion;date_date;data_find;data_media;data_media_find
Digital elevation models (DEM) in text format for all subsections at different moments.;"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.";2030-01-31;https://stowanl-my.sharepoint.com/:f:/g/personal/llhpp_stowa_nl/Eg8ax0uoIRZMgHWaleDWyGUBwP-7NO8oLcwK28FVWg0iEA?e=Hde3oy;https://stowanl-my.sharepoint.com/:f:/g/personal/llhpp_stowa_nl/Ej6GNkRfkSZPiZZd0tiHoLEBVPUQkQDMaiYmhEAqcwNbZg?e=ZSqJDW;https://doi.org/10.14428/DVN/IW7BTM


All EQUIPMENTS concerning Photogrammetry application to measurement of wave overtopping erosion progression through bare-clay
equip_type;equip_usage
"10 GoPro Hero 9 cameras;
RTK GPS;
 Agiosoft Metashape software";


All SENSORS concerning Photogrammetry application to measurement of wave overtopping erosion progression through bare-clay
sensor_type;sensor_attributes
;