Everything about Wave overtopping experiment bare clay section 1-3
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
102;Wave overtopping experiment bare clay section 1-3;Strength test;Right before the start of a test on a section, the upper 20 cm (including the grass sod) will be removed over a distance of 3.5 m long and 4m wide. This section was located in between 6 and 9.5m downstream of the outflow opening of the overtopping simulator and subjected to regular waves to be used in the calibration of an erosion relation;False;False;True;False;False;False;2022-02-02 14:45:00;2022-02-02 14:45:00;1;4.0;;Other;139727.0;226774.0;;6-9.5 m downstream of the outflow opening of the wave overtopping simulator located on the dike crest. The clay was removed on the landside slope. The bottom end of the test section is approximately 1m from the landside toe.;;these tests are aimed at measuring the erosion rate of the clay layer underneath a grass sod on the landside slope of a levee, in order to enable the determination of the residual strength of the levee after failure of the grass. The results can be used to test and validate erosion models – both current models and future models.;Little is yet known on the erosion resistance of clay under wave overtopping, and how the results of small scale erosion tests could be used to determine the erosive behaviour of clay subjected to real life loads.;;"At the upper section the test will start with the wave volume that is one level lower than the level which led to a significant erosion at the lowest section (in 10 waves). The volume is then increased to at most one level above the level at which the test may have been aborted in the lower or the middle section. Finally, the volume is decreased to 500 l/m. At every level, 20 waves are applied, with a maximum 60 second break after every 10th wave. New examples, closely connected to the examples in activity 101, with the assumption that the erosion in the middle section is not worse than in the lower section:
1. Start with 20 waves of 1500 l/m, with a maximum wave volume of 3400 l/m (this maximum is based on the specified limits).
2. Start with 20 waves of 1500 l/m, with a maximum wave volume of 3000 l/m.
3. Start with 20 waves of 3000 l/m, with a maximum wave volume of 3400 l/m (the ‘regular’ maximum volume of the current wave overtopping simulator).

In case the erosion at the middle section was worse than at the lower section (to be estimated by Deltares and the local test leader), then the test in the upper section will start at one level below that worse level, increasing to one level higher, followed by a decrease to 500 l/m.

For example, in case serious erosion occurred in the middle section at 1500 l/m and that test had to be aborted at that level. Then the middle section was clearly weaker than the lower section. Then the test in the upper section will start with 20 waves of 1000 l/m, and the maximum volume is 2000 l/m.

A total wave time is difficult to specify on beforehand, but most likely it will not be much more than 1.5 hours (including the maximum of 60 seconds break after every 10 waves).";10 GoPro's for photogrammetry for monitoring the difference in erosion depth between waves and for determining the front velocities of waves;The images from the GoPro's could be analysed using photogrammetry to get a full coverage of the change in erosion depth. This was used to determine an erosion relation.;;;;;;Erosion relation for wave overtopping on clay;;False;False;False;


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