The effects of beach width variability on coastal dune development at decadal scales

Silva, Filipe Galiforni; Wijnberg, Kathelijne Mariken; Groot, A.V. de; Hulscher, Suzanne J.M.H.

doi:10.1016/j.geomorph.2018.12.012

Cited by 27 publications

(29 citation statements)

References 33 publications

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“…On coastlines away from inlets, storm surges tend to reach the dune toe, erode the sediment and transport it towards the subtidal zone via a strong undertow current (Aagaard, 2014;Guannel and Özkan Haller, 2014). For sand flats, this mechanism holds at the start of the event, before sufficient levels for inundation.…”

Section: Discussionmentioning

confidence: 99%

Storm-induced sediment supply to coastal dunes on sand flats

2020

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Abstract. Growth of coastal dunes requires a marine supply of sediment. Processes that control the sediment transfer between the subtidal and the supratidal zone are not fully understood, especially in sand flats close to inlets. It is hypothesised that storm surge events induce sediment deposition on sand flats, providing fresh material for aeolian transport and dune growth. The objective of this study is to identify which processes cause deposition on the sand flat during storm surge conditions and discuss the relationship between the supratidal deposition and sediment supply to the dunes. We use the island of Texel (NL) as a case study, of which multiannual topographic and hydrographic datasets are available. Additionally, we use the numerical model XBeach to simulate the most frequent storm surge events for the area. Results show that supratidal shore-parallel deposition of sand occurs in both the numerical model and the topographic data. The amount of sand deposited is directly proportional to surge level and can account for more than a quarter of the volume deposited at the dunes yearly. Furthermore, storm surges are also capable of remobilising the top layer of sediment of the sand flat, making fresh sediment available for aeolian transport. Therefore, in a sand flat setting, storm surges have the potential of reworking significant amounts of sand for aeolian transport in periods after the storm and as such can also play a constructive role in coastal dune development.

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Section: Discussionmentioning

confidence: 99%

Storm-induced sediment supply to coastal dunes on sand flats

2020

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“…Within the infrastructure systems, robustness refers to the ability of a system to remain functioning under variable magnitudes of disruptions and pressures (Mens et al, 2011). Thus, it refers to the tolerance capacity of the system (Ganjurjav et al, 2019) and persistence characteristic of the system reflecting the engineering principle of resistance to disturbances (Chelleri, 2012). Notably, robustness and resilience are related characteristics if infrastructure performance continues its functioning after a disruption (Anderies et al, 2013;Meerow et al, 2016).…”

Section: (B) Resilient Versus Robust Systemsmentioning

confidence: 99%

Review article: Towards resilient vital infrastructure systems – challenges, opportunities, and future research agenda

Mehvar

Wijnberg

Borsje

et al. 2021

Nat. Hazards Earth Syst. Sci.

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Abstract. Infrastructure systems are inextricably tied to society by providing a variety of vital services. These systems play a fundamental role in reducing the vulnerability of communities and increasing their resilience to natural and human-induced hazards. While various definitions of resilience for infrastructure systems exist, analyzing the resilience of these systems within cross-sectoral and interdisciplinary perspectives remains limited and fragmented in research and practice. With the aim to assist researchers and practitioners in advancing understanding of resilience in designing infrastructure systems, this systematic literature review synthesizes and complements existing knowledge on designing resilient vital infrastructures by identifying (1) key conceptual tensions and challenges, (2) engineering and non-engineering measures, and (3) directions for future research. Here, a conceptual framework is developed in which infrastructures are defined as a conglomeration of interdependent social–ecological–technical systems. In addition, we define resilient infrastructures as systems with ability to (i) anticipate and absorb disturbances, (ii) adapt/transform in response to changes, (iii) recover, and (iv) learn from prior unforeseen events. Our results indicate that conceptual and practical challenges in designing resilient infrastructures continue to exist. Hence these systems are still being built without taking resilience explicitly into account. Our review of measures and recent applications shows that the available measures have not been widely applied in designing resilient infrastructure systems. Key concerns to address are identified as (i) the integration of social, ecological, and technical resilience of infrastructure systems with explicit attention paid to cascading effects and dependencies across these complex systems and (ii) the development of new technologies to identify factors that create different recovery characteristics.

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“…Mega-nourishments can also offer temporary wider and gradually sloping beaches, a positive condition for dune formation (Puijenbroek, 2019). Wider beaches not only provide accommodation space for dunes to form (Galiforni- Silva et al, 2019), but also enlarge the so-called fetch-length: the length of (dry) beach where wind can blow and pick up sediment (Delgado-Fernandez, 2010). The fetch length is related to the wind direction: at more oblique directions (SW and NW in Holland), wind covers a larger stretch of beach before reaching the dunes.…”

Section: The Supply Of Sedimentmentioning

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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The effects of beach width variability on coastal dune development at decadal scales

Cited by 27 publications

References 33 publications

Storm-induced sediment supply to coastal dunes on sand flats

Storm-induced sediment supply to coastal dunes on sand flats

Review article: Towards resilient vital infrastructure systems – challenges, opportunities, and future research agenda

Urban dunes

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