Everything about N-OF04 Overflow Test (Reference)
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
66;N-OF04 Overflow Test (Reference);Strength test;Reference test with additional hydraulic measurements.;False;False;True;False;False;False;2021-12-15 08:00:00;2021-12-20 17:00:00;4;;25 hours of effective overflow.;VI;51.34655;4.23143;12.0;Landward slope of levee.;Lambert'72 coordinates: X = 140431.5 m Y = 226316.4 m;Overflow test N-OF04is a reference test, which means that it is executed at a selected location which is void of any anomaly or obstacle. This test was conducted close to overflow sections N-OF10 and N-OF11 to serve as reference for these two tests.;Impact of river overflow on a grass-covered levee.;Prior  to  the  test,  the  section  did  not  appear  to  have  any  noticeable  discontinuities,  such  as damage  by  machinery,  irregular  vegetation  patterns  or  large  animal  burrows.  Through  a thorough visual inspection before commencement of the test a number of smallburrows were detected within and adjacent to the test section. Their depths were in the range of 8-12 cm and their diameters in the range of 3-5 cm, while none of them seemed to have penetrated beyond the clay layer. Their geometry and spatial distribution resembled mice burrows.;18 blocks of overflow for a total of 25 hours of discharge at 330 l/(s.m).. PTV and Lidar measurements on 16/11/2021.;- 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  test,  surface  erosion  and  burrows  were  monitored  every  2  test  blocks  of  flow. Surface erosion started with the uprooting of grass and exposure of small patches of clay with diameters  in  the  order  of  2-3  cm,  which  gradually  expanded  and  connected  with  adjacent patches of clay. This is a common pattern that has been observed in all overflow tests. Most of the mice burrows in the test section were within the first patches that formed, which shows that  the  burrows  may  have played  a  role  in  the  early  formation  of  surface  erosion.  Similar observations in other overflow tests are needed to validate this finding.;Thesefindings  are  also  further  discussed  in  the  report  concerning  burrows  in  levees (Tsimopoulou & Koelewijn, 2022).;The levee slope stayed in good condition apart from the slight erosion described during the activity. No critical damage.;Factual data report: https://stowanl-my.sharepoint.com/:w:/g/personal/llhpp_stowa_nl/EX5yYnuJ-EBBjoKAxAwg8LkBef8ra9V_-GHjzbkz0Was8g?e=pyaUSq Annexes: https://stowanl-my.sharepoint.com/:w:/g/personal/llhpp_stowa_nl/EWIzoxIhxopCryc6744YgHYBBWr_0fhoGpJ_1pSy0_tM2w?e=pY8Hc6;An integration report will be added later (February 2023) as knowledge document.;under development;True;False;False;


All DATA concerning N-OF04 Overflow Test (Reference)
data_type;data_descripion;date_date;data_find;data_media;data_media_find
Timeseries;Description: Timeseries of Discharge, Water Height and Current Velocity in different positions on the levee slope.;;https://stowanl-my.sharepoint.com/:f:/g/personal/llhpp_stowa_nl/Ev6vXCwP_DpChQGv6hWGuqwB9hXkZ1WJ1H3P9XFI1Et49g?e=ZAnqIp;;
Photo imagery;2 portals with in total 4 cameras are used to take surface photographs of the levee slope at different times during and in between overflow activity. The surface images in between overflow blocks show damage and vegetation evolution.;;https://stowanl-my.sharepoint.com/:f:/g/personal/llhpp_stowa_nl/EqavdwFClVxNt3XLrqpKXdcBdORLxrrSRV6Cr9PE41x8uA?e=KsLEjU;;


All EQUIPMENTS concerning N-OF04 Overflow Test (Reference)
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 N-OF04 Overflow Test (Reference)
No sensors added