document

Transition structures in grass covered slopes of primary flood defences tested with the wave impact generator

Van Steeg, P. (author), Labruijere, A. (author), Mom, R. (author)

The stability of grass covered slopes on primary flood defences under wave attack is an important aspect with respect to the strength of the entire dike. In a grass slope many transitions to objects (poles, stairs, fences, buildings et cetera) or other revetments (concrete, asphalt, placed block revetment) can be present. This can potentially...

report 2015

document

Velocity and water-layer thickness of overtopping flows on sea dikes: Report of measurements and formulas development

Trung, L.H. (author)

The study aims to establish a set of formulas estimating velocity and depth of overtopping flows at sea dikes including seaward-side slope, crest and landward-side slope. These formulas are applicable to flows which are generated by natural waves and the simulator giving associated characteristics of any arbitrary value of exceedance probability...

report 2014

document

Analyses grass erosion in wave run-up and wave overtopping conditions

Van der Meer, J.W. (author), Hoffmans, G. (author), Van der Hoven, A. (author)

Within the framework of WTI, Research and Development of Flood Defence Assessment Tools (Wettelijk Toetsinstrumentarium), which is called in Dutch: WTI-2017 "Onderzoek en ontwikkeling landelijk toetsinstrumentarium", research was carried out to develop an erosion model for grass in the wave run-up zone consistent with the current model in use...

report 2014

document

Root characteristics of some grass species on the sea dikes in Viet Nam

Trung, L.H. (author)

Between 2009 and 2011, some grass-covered sea dikes were tested with the Wave Overtopping Simulator in the north of Viet Nam. Slope specifications and grass species of sea and estuary dikes were quantitatively observed and investigated. This report is concerned with expressing main characteristics of four grass species on some dike slopes in the...

report 2012

document

Wave overtopping simulator on a 1/15 slope protected by two local grass species

Trung, L.H. (author)

The phenomenon of wave overtopping during storms was simulated by the Wave Overtopping Simulator on a 1/15 grass covered slope. The four 'Wave Overtopping Simulator' tests were done within the framework of the Research project 'Super sea dike with high safety level and environmental friendly' funded by Viet Nam government. The main objective of...

report 2012

document

SBW Wave overtopping and grass cover strength: Preditions of Prototype Tests

Steendam, G.J. (author), Hoffmans, G. (author), Bakker, J. (author), Van der Meer, J.W. (author), Frissel, J. (author), Paulissen, M. (author), Verheij, H.J. (author)

Overview of overtopping with focus on river dikes. Realtin with sod density.

report 2012

document

Guidance on erosion resistance of inner slopes of dikes from 3 years of testing with the Wave Overtopping Simulator

Van der Meer, J.W. (author)

The Wave Overtopping Simulator was developed in 2006 and destructive tests have been performed in February and March of 2007, 2008 and 2009 and will probably be continued in 2010. The tests show the behaviour of various inner slopes of dikes, embankments or levees under simulation of wave overtopping, up to a mean overtopping discharge of 125 l...

report 2009

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EroGRASS: Failure of grass cover layers at seaward and shoreward dike slopes. design, construction and performance

Piontkowitz, T. (author)

A large number of the dikes in the North Sea and Baltic Sea regions are covered with grass that is exposed to hydraulic loading from waves and currents during storm surges. During previous storm surges the grass cover layers often showed large strength and remained undamaged. A clear physical understanding of the failure of grass cover layers...

report 2009

document

Die bemessung der Außenböschung von Seedeichen unter Anzats des festigkeitssteigernden Einflusses der Grasnarbe

Pohl, C. (author), Richwien, W. (author)

Describes relation between wave impact and damage to grass layers.

report 2009

document

Placement of Smart Grass reinforcement at test sections Groningen Sea dike

van Gerven, K.A.J. (author), Akkerman, G.J. (author)

The present report deals with the application of a provisional Smart Grass Reinforcement (SGR) system in 2006 for full scale testing of increased overtopping at the Groningen sea dyke test section near Delfzijl, as envisaged in 2007. The SGR has been placed at two strips of 4 m wide: one primary strip at the basic test site and one at a...

report 2007

document

Golfoverslag en sterkte binnentalud bij dijken

Galema, A.A. (author), De Jong, R.H. (author), Pruis, K.W. (author), Wisse, A. (author)

Dit verslag is een rapportage van ons afstudeerproject voor de opleiding algemene Civiele Techniek aan de Noordelijke Hogeschool Leeuwarden.Dit afstudeerproject is in samenwerking met INFRAM uitgevoerd. Het onderzoek richt zich op de sterkte van grasbekleding op het binnentalud van zeedijken. Voor het beproeven van de grasmat op locatie wordt...

report 2006

document

Conceptual model for reinforced grass on inner dike slopes

ComCoast (author)

A desk study has been carried out in order to develop a conceptual model for the erosion of inner dike slopes with reinforced grass cover. Based on the results the following can be concluded: The presence of a geosynthetic in a grass slope can be taken into account in the EPM method by increasing the critical flow velocity. In particular, a...

report 2005

document

Refining Green Plants to Protein Cakes and other useful products in the African country Zambia

Chen, T. (author), Jiang, S. (author), Ma, S. (author), Ros, C.H. (author), Pfeiffer, T.V. (author), Suijker, J.M. (author), Wichmann, A. (author)

report 2004

document

Basis of Design for a process to refine green plants

Chen, T. (author), Jiang, S. (author), Ma, S. (author), Ros, C.H. (author), Pfeiffer, T.V. (author), Suijker, J.M. (author), Wichmann, A. (author)

report 2003

document

Vegetation dynamics and erosion resistance of sea dyke grassland

Sprangers, J.T.C.M. (author)

The high erosion resistance of grass swards on c1ay dykes seems to be largely determined by the amount of roots and the root system architecture. Following on previous studies on river dykes which revealed high root densities and erosion resistance in unfertilised pastures and hay-meadows, we experimentally investigated the influence of...

report 1999

document

Grasmat als dijkbekleding

Muijs, J.A. (author)

Een groot gedeelte van de Nederlandse dijken is bekleed met een grasmat. Daar, waar men op een deel van de dijk een hard bekledingstype heeft aangebracht, is toch een belangrijk deel van het dijkoppervlak, zoals de kruin en het binnentalud, een grasmat. Het onderzoek en de ervaringen vanaf het midden van de jaren tachtig hebben geleerd, dat...

report 1999

document

Analyse van deltagootproeven op een grastalud: Deel 1 en 2

anonymous, A. (author)

Er is een analyse van de waarnemingen en metingen met betrekking tot ontgronding uitgevoerd voor de 1:1 modelproef in 1992 in de Deltagoot met golven van Hs 0.75 m tot 1.35 m op een grastalud van een dijk. De gemeten ontgronding is veel geringer dan tijdens vergelijkbare proeven op klei met een bodemstructuur, maar zonder zodelaag. Pas na vele...

report 1998

document

Grasdijken: Analyse meetresultaten grootschalig modelonderzoek

Meijer, D.G. (author), Verheij, H.J. (author)

report 1998

document

Analyse van deltagootproeven op een grastalud: Deel 3

anonymous, A. (author)

Dit rapport bevat verscheidene tabellen met overschrijdingskrommen of overschrijdingsduren en drukgradienten met betrekking tot graserosie in deltagootproeven. Parameters en karakteristieken van de grond worden besproken in meerdere scenario's.

report 1998

document

Extensief graslandbeheer op zeedijken

Sprangers, J.T.C.M. (author), Raemakers, I.P. (author)

Voortzetting van een experiment met ex&ensief graslandbeheer op zeedijen. Na het stopzettenvan bemesting in combinatie met een verminderde begrazingsdruk of hooibeheer in een aantal proefvakken op zeedijken, zijn de effekten bestudeerd op soortensamenstelling, en de zode- en worteldichtheid van het grasland. Met behulp van een erosiecentrifuge...

report 1998