Scale Experiments on Aeolian Deposition and Erosion Patterns Created by Buildings on the Beach

Poppema, Daan Willem; Wijnberg, Kathelijne Mariken; Mulder, Jan; Hulscher, Suzanne J.M.H.

doi:10.1142/9789811204487_0146

Cited by 10 publications

(12 citation statements)

References 20 publications

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“…Furthermore, a higher building impacts the wind velocity magnitudes for a longer distance downstream the building. The horizontal divergence of the velocity field is then calculated for one case, shown in Figure 7a, and the results are compared with the field measurements of erosion and sedimentation patterns around scaled buildings at the beach, shown in Figure 7b, done by Poppema et al (2019). The divergence of the velocity field represents the rate of flow inward or outward from a given point, therefore the results of the horizontal divergence of the velocity field can be helpful for predicting the aeolian erosion and deposition patterns around a building.…”

Section: Resultsmentioning

confidence: 99%

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The Impact of Buildings' Characteristics on Airflow Patterns and Bed Morphology at Beaches, Using CFD Modelling

Pourteimouri¹,

Campmans²,

Wijnberg³

et al. 2020

Int. Conf. Coastal. Eng.

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During the last century rapid urbanization of coastal zones has been widespread all over the world. This highly increasing population in coastal zones leads to the construction of restaurants, sailing clubs, beach houses and pavilions at the beach-dune interface. Structures located adjacent to dunefields change the local airflow patterns which, in turn, alter sediment transport pathways and influence the aeolian landforms [Jackson and Nordstrom, 2011]. In this paper, firstly the impacts of buildings' characteristics on airflow patterns are investigated, specifically the impacts of building length, width and height. Secondly, the near-bed horizontal divergence of the velocity field is calculated for one case to infer resulting erosion and deposition patterns around the building. For all these purposes, a numerical model is developed.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/LNf-_Izu6Wk

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Section: Resultsmentioning

confidence: 99%

“…Results of the a) numerical predictions of the horizontal divergence of the velocity field, and b) field measurements of erosion and deposition patterns around a scaled building(Poppema et al, 2019).…”

mentioning

confidence: 99%

The Impact of Buildings' Characteristics on Airflow Patterns and Bed Morphology at Beaches, Using CFD Modelling

Pourteimouri¹,

Campmans²,

Wijnberg³

et al. 2020

Int. Conf. Coastal. Eng.

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show abstract

“…For instance, Boers et al (2009) used a wave basin to study storm erosion of a scaled dike-and-dune system; wind flow around buildings or over dunes can be studied in wind tunnels (e.g. Fackrell, 1984;Wiggs et al, 1996 (Poppema et al, 2019).…”

Section: Physical Models -Scaled Lab Experimentsmentioning

confidence: 99%

“…The morpholog-ic change is derived from the conservation of sediment. Simulations can be made for full scale beach houses, but also at the scale of the physical model experiments at the beach by Poppema et al (2019) to support interpretation of observed sedimentation patterns in terms of underlying mechanisms and test for possible scaling effects.…”

Section: Physical Models -Scaled Lab Experimentsmentioning

confidence: 99%

Beach-dune modelling in support of Building with Nature for an integrated spatial design of urbanized sandy shores

Wijnberg

Poppema

Mulder

et al. 2021

RiUS

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The long-term physical existence of sandy shores critically depends on a balanced sediment budget. From the principles of Building with Nature it follows that a sustainable protection of sandy shores should employ some form of shore nourishment. In the spatial design process of urbanized sandy shores, where multiple functions must be integrated, the knowledge and the prediction of sediment dynamics and beach-dune morphology thus play an essential role. This expertise typically resides with coastal scientists who have condensed their knowledge in various types of morphological models that serve different purposes and rely on different assumptions, thus have their specific strengths and limitations. This paper identifies morphological information needs for the integrated spatial design of urbanized sandy shores using BwN principles, outlines capabilities of different types of morphological models to support this and identifies current gaps between the two. A clear mismatch arises from the absence of buildings and accompanying human activities in current numerical models simulating morphological developments in beach-dune environments.

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“…Diversion of wind around beach buildings causes wind to accelerate (picking up sediment) and decelerate, leading to local deposition of sediment on the lee sides, or the formation of 'Sand tails'. The deposition starts in horse-shoe patterns (Poppema, 2019), but can accumulate in combined tails at the back of the building under changing wind conditions as illustrated by GIS-analysis (Van Bergen, 2020) and fieldwork (figure 8). The surplus in deposition can be used for the local harvesting of sediment (e.g.…”

Section: A: Mobilization Of Windmentioning

confidence: 99%

Urban dunes

Bergen

Mulder

Nijhuis

et al. 2021

RiUS

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Sandy shores worldwide suffer from coastal erosion due to a lack of sediment input and sea-level rise. In response, coastal sand nourishments are executed using ‘Building with Nature’ techniques (BwN), in which the sand balance is amplified and natural dynamics are instrumental in the redistribution of sand, cross- and alongshore. These nourishments contribute to the growth of beaches and dunes, serving various design objectives (such as flood safety, nature, and recreation). Nevertheless, human interference (such as buildings and traffic) along urbanized sandy shores may have significant, yet poorly understood, effects on beach and dune development. Better insight is required into the interplay of morphological, ecological and urban processes to support Aeolian BwN processes for dune formation and contribute to the sustainable design of urbanized coastal zones. This paper aims to bridge the gap between coastal engineering and urban design by formulating design principles for BwN along urbanized sandy shores, combining nourishments, natural dune formation and urban development on a local scale to strengthen the coastal buffer. The first part of the paper analyses sedimentation processes in the (built) sea-land interface and identifies spatial mechanisms that relate coastal occupation to dune formation. Hence a preliminary set of design principles is derived by manipulating wind-driven sediment transport for BwN dune formation after nourishment. In the second part of the paper, these principles are applied and contextualized in two case-studies to compare their capability for BwN in different coastal profiles: the vast, rural, geomorphologically high dynamic profile of a mega-nourishment (Sand Motor); versus the compact, highly urbanized, profile(s) of a coastal resort (Noordwijk). Conclusions reflect on the applicability of BwN design principles within different coastal settings (dynamics, urbanity) and spatial arrangements facilitating BwN dune formation.

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Scale Experiments on Aeolian Deposition and Erosion Patterns Created by Buildings on the Beach

Cited by 10 publications

References 20 publications

The Impact of Buildings' Characteristics on Airflow Patterns and Bed Morphology at Beaches, Using CFD Modelling

The Impact of Buildings' Characteristics on Airflow Patterns and Bed Morphology at Beaches, Using CFD Modelling

Beach-dune modelling in support of Building with Nature for an integrated spatial design of urbanized sandy shores

Urban dunes

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