Everything about B-OF05 Overflow Test (Large cliff at toe)
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
80;B-OF05 Overflow Test (Large cliff at toe);Strength test;;False;True;True;False;False;False;2020-11-13 08:00:00;2020-11-14 17:00:00;;17.0;;IV;51.34202;4.23764;11.2;Landward side of levee.;"Lambert'72 coordiantes:
X=140862.90 m;
Y=225811.90 m;";A large erosion cliff at the toe of the levee is present. This is caused by animals grazing on the levee.;How does slope anomalies affect the erosion resistance and stability of the levee?;The levee slope is characterized by a local, steep cliff of more than 1 meter high near the levee toe.;17 blocks of overflow activity were held, for a total of 17 hours and 4 minutes. The discharge that was close to 320 l/s corresponding to a specific discharge of 160 l/(s.m).;- Overhead cameras (4) - Acoustic water height sensors - Electromagnetic current velocity sensors - Discharge sensor (EM or acoustic);"Description of the hydraulic conditions of the overflow. The setup is described in Vercruysse et al. (2022): ""Design and application of an overflow generator."" (Ref WL2022R20_047_1)";;During the entire test, no significant damage, other then the normal evolution was observed, until a sudden, massive failure occurred.;The section B-OF05 has developed into a slope instability after 17.1 hours of overflow. The process responsible for this is, however, not exactly known. It is assumed that gradually surface erosion of the cliff area, resulting in steepening of the slope and a cover layer getting thinner, suddenly gave rise to a connection with the sandy core, giving rise to an abrupt failure.;"The presence of animals and vegetation in the area may have promoted the presence of other animals (e.g. mole, rabbit, mice) that created small burrows in the area. Other experiments in Polder2C’s learned that burrows may be a critical feature in levee cover safety. 
A levee slope may appear stable and in a good shape for an extended period of time. 
However, during in an overflow event, the evolution from minor to major (decametric) 
damage may develop within minutes. Saturation of the levee cover sands, which is thought 
to take several hours to accomplish, may play a role in this fast evolution";Factual data report + Annexes: https://stowanl-my.sharepoint.com/:f:/g/personal/llhpp_stowa_nl/EvdAZOO-zylAqEWS8-SEiC4BQ5xCAuFXklsysJXnkcVYaQ?e=XDeXq8;An integration report will be added later (February 2023) as knowledge document.;under development;True;False;False;


All DATA concerning B-OF05 Overflow Test (Large cliff at toe)
data_type;data_descripion;date_date;data_find;data_media;data_media_find
Monitoring timeseries;;;https://stowanl-my.sharepoint.com/:f:/g/personal/llhpp_stowa_nl/Ej16vHLzGndMql1HLAjp714BpHrFVvot4KZEbjbjaTn38Q?e=6TDpPX;;
Surface state pictures;;;https://stowanl-my.sharepoint.com/:f:/g/personal/llhpp_stowa_nl/Epi-EudlZXVBmigZf1t7ehIBwxorA34QomkMgzWoHZttVA?e=ZkSb9O;;


All EQUIPMENTS concerning B-OF05 Overflow Test (Large cliff at toe)
equip_type;equip_usage
"Overflow generator.
";"The setup is described in Vercruysse et al. (2022): ""Design and application of an overflow generator."" (Ref WL2022R20_047_1)"


All SENSORS concerning B-OF05 Overflow Test (Large cliff at toe)
No sensors added