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Activity Name:

Emergency reparation - Geotextiles

Activity Numbre:

124

Activity type

Other

Involved Workpackage

Flood defences
Emergency response
Knowledge infrastructure

Objective

To test different type clamps and different type of cover layers and their influence on the grass strength.

Activity Brief descriptor

Placing the cover layers with different clamps on a bare clay levee and see how it holds during the summer period.

Linked to theme(s):

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

Activity Time

Start Date:

March 31, 2021, midnight

End Date:

March 31, 2021, midnight

Active time length:

Days:

1

Hours:

None

Other:

Location

Levee stretch:

VI

Coordinates/ Latitude (WGS):

None

Coordinates/ Longitude (WGS):

None

Coordinates/ Altitude (mTAW):

None

Descriptor:

Other references:

Data

Data: 1

Data type: pdf
Description: evaluation report of field experiments
Date availability: Nov. 24, 2022
Find at: https://stowanl-my.sharepoint.com/:b:/g/personal/llhpp_stowa_nl/ESgJfS847j9Ili3dBhBBRH0Bu2ovb0T5fKQL1DrmifFoWg?e=n1V24f
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Data: 2

Data type: powerpoint
Description: results brainstorm session
Date availability: Nov. 24, 2022
Find at: https://stowanl-my.sharepoint.com/:b:/g/personal/llhpp_stowa_nl/EYSrjPrbZWJCqYKJAPlX19QB1NqRiTSHl4loaWrVuvj8SQ?e=J4U7De
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Relationships with other activities

Detaled information about the activity

Pre-conditions

Activity Descriptor

Equipments

this activity does not have equipments

Monitoring & Sensors

this activity does not have sensors

Limits

During Activity

1. Investigate ease of inserting different types of fixation - U-clamp; - T/ Y-clamp; - Screw (Wormi); - Optionally Gripple method (Terra Lock Pin Range TL-P1 or TL-P3) 2. Test the grass recovery (including seeding) in one growing season with different type of cover for a) grass and b) clay - Tensar - Reinforced Turfmat Gripple - Coco mat, jute mat, hemp mat 3. Testing strength of cover (winter 2021) in combination with fixation - Tensar - Reinforced Turfmat Gripple 4 General test on how to deal with an overlap (imbricated work parallel or transverse to dike axis) 5 General testing of the recent work instruction (version 0.8)

Post-activity conditions

After this the reinfoced turfmat are tested by WP1. See activity of wp1.

Immediate Results

Results /Conclusion

- 40 centimeter of length is enough strength and longer is overkill. - New type of cover layers are tested. - Coconut mat is handy in combination with hard wind as it is permeable.

Infrastructure Knowledge

Other key information