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Insights from Steady Overflow Tests on Grass Covers within the Framework of Polder2C’s
Verelst, K.; Depreiter, D.; Vercruysse, J.B.; Peeters, P. (2023). Insights from Steady Overflow Tests on Grass Covers within the Framework of Polder2C’s, in: 29th Meeting of European Working Group on Internal Erosion in Embankment Dams, Dikes and Levees and their Foundations, Lyon - July 2-5, 2023
 - 4th Meeting of European Working Group on Overflow and Overtopping Erosion, Lyon - July 5-7, 2023. pp. [1-2]
In: (2023). 29th Meeting of European Working Group on Internal Erosion in Embankment Dams, Dikes and Levees and their Foundations, Lyon - July 2-5, 2023
 - 4th Meeting of European Working Group on Overflow and Overtopping Erosion, Lyon - July 5-7, 2023. [S.n.]: [s.l.]. , meer
Beschikbaar in  Auteurs 
Documenttype: Congresbijdrage
Trefwoorden
    Hydraulic structures > Dikes, shores and other flood defenses > Erosion protection
    Hydraulic structures > Dikes, shores and other flood defenses > Failure mechanisms
    In-situ measurements
Author keywords
    Erosion, grass cover, measurement techniques, polder2c’s
Project Top | Auteurs 
  • Interregproject POLDER2C's, meer
Auteurs  Top 
  • Verelst, K., meer
  • Depreiter, D.
  • Vercruysse, J.B., meer
  • Peeters, P., meer
Abstract
    Within the framework of the INTERREG project Polder2C’s, steady overflow tests are carried out to test the strength of levees and the levee cover layer under the load of continuously overflowing discharge of water. The presentation presents insights from the velocity measurements executed during the steady overflow tests and insights concerning the erosion resistance of the grass cover layer. Water level and flow velocity were measured along the levee slope by means of different measuring techniques. Measuring in outdoor conditions proved to be challenging. For the executed overflow tests, the measured or calculated flow velocity at 4 m from the levee crest is compared with relations between flow duration, limiting flow velocity and grass cover quality from literature. The common – and probably decisive – factor for failure was the presence of burrows, as well as for the tests with short duration to failure as for the tests with a duration of 10 to 20 hours to failure. Tests that did not led to failure show that most of the levees, when in a well maintained condition, can withstand an overflow event even during a period of 30 hours.
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