Activity_create

Activity Name:

N-OT03 Overtopping Test (Animal burrow)

Activity Numbre:

171

Activity type

Strength test

Involved Workpackage

Flood defences

Emergency response

Knowledge infrastructure

Objective

Activity Brief descriptor

This test was executed on a ‘test section with a uniform vegetation cover’, but with numerous number of mole hills in place (as compared to N-OT01). Artificial burrows in the higher and lower part of the slope were drilled with a connection to the sandy core. The slope is 1:2,5.

Linked to theme(s):

Breaching

Animal- & vegetation-induced anomalies

Erosion processes

Temporary levee repairs

Levee survey & monitoring technique

Prolonged collaboration

Activity Time

Start Date:

None

End Date:

None

Active time length:

Days:

Hours:

None

Other:

Location

Levee stretch:

Coordinates/ Latitude (WGS):

None

Coordinates/ Longitude (WGS):

None

Coordinates/ Altitude (mTAW):

12.0

Descriptor:

Landward slope of levee.

Other references:

Wave sets 0,5m60lsm, 0,5m60lsmov and 1m190lsm (repeatedly)

Data

This activity has no data

Relationships with other activities

Activities that are linked to 171/ N-OT03 Overtopping Test (Animal burrow) :
DB_id: 172/ N-OT04 Overtopping Test (Artificial burrow)
DB_id: 171/ N-OT03 Overtopping Test (Animal burrow)
DB_id: 171/ N-OT03 Overtopping Test (Animal burrow) linked to the following activities:
DB_id: 99/ Wave overtopping erosion experiments
DB_id: 79/ B-OF04 Overflow Test (Tree + small cliff annomaly)
DB_id: 80/ B-OF05 Overflow Test (Large cliff at toe)
DB_id: 67/ N-OF05 Overflow Test (Burrow)
DB_id: 168/ P2C Wave overtopping tests

Detaled information about the activity

Pre-conditions

A levee slope with a lot of animal holes present.

Activity Descriptor

The following wave sets were consecutively applied: 0,5m60lsm, 0,5m60lsmov and 1m190lsm (repeatedly).

Equipments

this activity does not have equipments

Monitoring & Sensors

this activity does not have sensors

Limits

During Activity

A slope with a lot of animal holes present, showed no serious damage after the third set of waves. The gravel box at the toe became again visible. Bare spots grew and became more and more noticeable. Continuing by repeating the third wave set gave no signs of imminent failure of the cover. Therefore, 2 artificial burrows (ø = 10 cm) were drilled, in line with each other, one in the higher and one in the lower part of the slope, each consisting of an upward vertical pipe (angle of 90°) connecting with a downward more or less horizontally (angle of -10°) pipe and touching upon the sandy core.

Post-activity conditions

The artificial burrows did not lead to failure.

Immediate Results

Numerous mole holes and artificial drilled pipes present and no failure imminent.

Results /Conclusion

Infrastructure Knowledge

Other key information