Evaluating the PEM passive beach drainage system in a 4-year field experiment at Egmond (The Netherlands)

Walstra, D.J.R.; Brière, Christophe; Vonhögen-Peeters, L.M.

doi:10.1016/j.coastaleng.2014.07.002

Cited by 5 publications

(6 citation statements)

References 20 publications

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“…Bars are the net result of cross-shore sediment accumulation resulting from the highly non-linear morphological feedback between the bed profile and nearshore hydrodynamics (e.g., [2,5]). As bars may also influence upper beach morphology [6][7][8] and are often altered by shoreface nourishments (e.g., [9][10][11]), their relevance for coastal managers is evident.…”

Section: Introductionmentioning

confidence: 99%

“…The behavior of (multiple) bar systems has been studied extensively over the past decades. These studies focused on bar behavior at time scales ranging from hours, days and weeks (e.g., [7,12,13]), via months and seasons (e.g., [14][15][16]) to years and decades (e.g., [5,8,[17][18][19][20][21]). Common findings are that bars mostly have a multi-annual lifetime and that up to five bars can occur simultaneously in the cross-shore.…”

Section: Introductionmentioning

confidence: 99%

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On the Intersite Variability in Inter-Annual Nearshore Sandbar Cycles

Walstra

Wesselman

Deijl

et al. 2016

JMSE

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Inter-annual bar dynamics may vary considerably across sites with very similar environmental settings. In particular, the variability of the bar cycle return period (T r) may differ by a factor of 3 to 4. To date, data studies are only partially successful in explaining differences in T r , establishing at best weak correlations to local environmental characteristics. Here, we use a process-based forward model to investigate the non-linear interactions between the hydrodynamic forcing and the morphodynamic profile response for two sites along the Dutch coast (Noordwijk and Egmond) that despite strong similarity in environmental conditions exhibit distinctly different T r values. Our exploratory modeling enables a consistent investigation of the role of specific parameters at a level of detail that cannot be achieved from observations alone, and provides insights into the mechanisms that govern T r. The results reveal that the bed slope in the barred zone is the most important parameter governing T r. As a bar migrates further offshore, a steeper slope results in a stronger relative increase in the water depth above the bar crest which reduces wave breaking and in turn reduces the offshore migration rate. The deceleration of the offshore migration rate as the bar moves to deeper water-the morphodynamic feedback loop-contrasts with the initial enhanced offshore migration behavior of the bar. The initial behavior is determined by the intense wave breaking associated with the steeper profile slope. This explains the counter-intuitive observations at Egmond where T r is significantly longer than at Noordwijk despite Egmond having the more energetic wave climate which typically reduces T r .

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the Intersite Variability in Inter-Annual Nearshore Sandbar Cycles

Walstra

Wesselman

Deijl

et al. 2016

JMSE

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show abstract

“…On the other hand, the results are variable and depend on local situations in the field campaigns. Some authors firmly declared the system malfunctioning and its low reliability as a coastal defense method [30,92,98,126]. Others drew opposite conclusions even for the same site, deployed and monitored at different periods (it is the case of Walstra et al [98] and Reedijk et al [127]).…”

Section: Discussionmentioning

confidence: 99%

“…The latest two field campaigns, independently documented, are [98,99], with two opposite interpretations of the results. The first one describes 4 years of survey in the Netherlands of a passive vertical drainage system.…”

Section: Field Campaignsmentioning

confidence: 99%

Beach Drainage System: A Comprehensive Review of a Controversial Soft-Engineering Method

Fischione

Pasquali

Celli

et al. 2022

JMSE

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The beach drainage can be included among the soft engineering methods aimed to counteract the shoreline retreat related to the sediment redistribution along the beach profile. The idea that the groundwater table plays a role in the mobilization of the sediment grains underlies the application of the beach drainage system (BDS) as a tool able to modify the natural dynamics of groundwater table at sandy beaches. Indeed, BDS consists of a series of alongshore buried drains aimed to lower the groundwater table. Due to the drainage, the thickening of the layer of dry sand makes the solid grains less prone to be mobilized by the action of the waves at the swash zone, where interaction phenomena between the percolating and the incoming water lens take place. This tool had a troubled history. Its first applications were encouraging. Since then, controversial performances of both experimental and prototype scale experiences have been observed around the world. This paper aims to present an up-to-date full review of the studies and experiments carried out so far, in order to provide the reader with a complete perspective on its strength and weakness as well as open challenges to be faced in the near future.

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“…The Pressure Equalization ModuleÓ, i.e. vertical drains connecting upper sand layers with deeper ones, appears to be even more ineffective (Walstra, Brière, and Vonhögen-Peeters, 2014).…”

Section: Some Innovative Concepts and Schemes For Coastal Protectionmentioning

confidence: 99%

Canons of Coastal Engineering in the United Kingdom: Seawalls/Groynes, a Century of Change?

Williams

Giardino

Pranzini

2016

Journal of Coastal Research

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Evaluating the PEM passive beach drainage system in a 4-year field experiment at Egmond (The Netherlands)

Cited by 5 publications

References 20 publications

On the Intersite Variability in Inter-Annual Nearshore Sandbar Cycles

On the Intersite Variability in Inter-Annual Nearshore Sandbar Cycles

Beach Drainage System: A Comprehensive Review of a Controversial Soft-Engineering Method

Canons of Coastal Engineering in the United Kingdom: Seawalls/Groynes, a Century of Change?

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