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Activity Name:

Wave overtopping experiment bare clay section 2-2

Activity Numbre:

104

Activity type

Strength test

Involved Workpackage

Flood defences
Emergency response
Knowledge infrastructure

Objective

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.

Activity Brief descriptor

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 10.5 and 14m downstream of the outflow opening of the overtopping simulator and subjected to irregular waves to be used in the validationof an erosion relation

Linked to theme(s):

Breaching
Animal- & vegetation-induced anomalies
Erosion processes
Temporary levee repairs
Levee survey & monitoring technique
Prolonged collaboration

Activity Time

Start Date:

Feb. 7, 2022, 3:53 p.m.

End Date:

Feb. 7, 2022, 3:54 p.m.

Active time length:

Days:

None

Hours:

None

Other:

Location

Levee stretch:

Other

Coordinates/ Latitude (WGS):

139735.0

Coordinates/ Longitude (WGS):

226778.0

Coordinates/ Altitude (mTAW):

None

Descriptor:

Test was performed at a distance of 10.5 to 14m from the overtopping simulator located on the levee crest. The coordinates indicate the general area where the test was performed.

Other references:

Data

Data: 1

Data type:
Description:
Date availability: None
Find at: https://stowanl-my.sharepoint.com/:f:/g/personal/llhpp_stowa_nl/Ejr1ykRvpXpGn68Jqkp1CEwBEgnYxnRQ16FdIVvNvRxkrw
Media avaliable:
Find media:

Relationships with other activities

Detaled information about the activity

Pre-conditions

The grass was removed over a section of 3.5m x 4m wide, and a depth of 20 cm using a crane. Upstream of the test section the levee was covered with grass

Activity Descriptor

Equipments

Equipment: 1

- Wave overtopping simulator including pumps, pipelines, cranes for moving, etc
Wave overtopping simulator was used to offer a proper comparison against the erosion resistance of grass and as it is currently the most viable way of simulator up to real loading conditions in situ

Monitoring & Sensors

10 GoPro's for photogrammetry for monitoring the difference in erosion depth between waves and for determining the front velocities of waves
To be able to derive an erosion relation

this activity does not have sensors

Limits

During Activity

Post-activity conditions

Immediate Results

Results /Conclusion

Infrastructure Knowledge

Erosion relation for wave overtopping on clay
This activity was used to validate this relation

Other key information