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Research content This poster presents selected findings from the article Unsteady linearisation of bed shear stress for idealised storm surge modelling of 2021 for the participants in the NCK Days 2022, the yearly get-together of the Netherlands Centre for Coastal Research. The summary underlying the poster is available from the event's Book of Abstracts both as web page and as PDF document. The poster is open-access under a Creative Commons Attribution 4.0 International. Document design: structure and styling The conference organisers required the production of a paper-based poster in A0 format with portrait orientation. The document has been designed in A4 format, as available from the copy shared in this website. A resolution of 1200 dpi produced sharp enough images when printing in A0 size a document in PDF format. The whole document has been composed as a three-column table of a Google Doc document, with row-wise column merges which produce a well-marked layout consisting of stacked rows. In order to favour speed-reading, two font types and sizes produce a contrast between headings and narrative. Likewise, the text blocks are made of short and clearly spaced paragraphs, easy to point to and scan. The font size in the text body was readable when printed in A0 and, in retrospect for the specific venue the poster has been presented in, could still have been reduced to the same effect. Test prints confirmed that an additional margin would have been present around the page. The poster promotes a study published in a journal article, whereby the methods and results on display are already established. The audience is assumed to have been attracted by the poster title, thus to have been moved by an affinity for the topical area and to nurse a potential curiosity about reading the article in depth. As a result, the slant of this poster is intendedly descriptive, if not unimaginative; visuals are not especially meant or positioned to catch the eye. Document design: narrative and presentation The findings selected for the poster are those encapsulating the novelties of the article most compactly. This content selection provides maximum integration between narrative and scientific advances within the limited space of the document and of the interactions in a poster session. The table cells organise information progressively more detailed in the reading direction, broadly following a general-to-specific or abstraction-to-implementation order. During a poster session, the poster presenter could illustrate the content either in a bottom-up fashion starting from the results, supported by cartoons and graphs; or top-down, starting from the generalities presented as textual narrative. Outside the poster session, interested passerbys may find essential guidance into the topic scanning the poster in normal reading direction. Document design: on-line dissemination Hyperlinks to further resources, aimed at the digital poster version, are in blue. The DOI of this document has been reserved upon creating an unpublished Zenodo entry while drafting the poster. The DOI is shown in the poster so as to inform the viewers of the possibility to download the document after the conference. The poster has been uploaded ahead of the event and embargoed until the planned day of the off-line presentation. The publication date is the date of the poster session. Description authored by Giordano Lipari, {"references":["Roos PC, Lipari G, Pitzalis C, Reef KRG, Campmans GHP, Hulscher SJMH. Unsteady Linearisation of Bed Shear Stress for Idealised Storm Surge Modelling. Journal of Marine Science and Engineering. 2021; 9(11):1160. https://doi.org/10.3390/jmse9111160"]}

Barrier coasts are a distinct type of coast characterized by a chain of barrier islands and tidal inlets separated from the mainland coast by a backbarrier basin or lagoon. They cover around 10% of the world’s coastline and they display a variety of shapes and sizes. Barrier coasts possess outstanding ecological values and are economically important for activities such as navigation, resources extraction, and tourism. Furthermore, they mitigate the effect of storms on the outer sea by shielding the mainland coast. Besides their functionality, barrier islands are prone to flooding, due to their low elevation and closeness to sea. This can have significant consequences, as in 2012 when Hurricane Sandy caused three breaches in the barrier islands off the coast of Long Island. To maintain barrier coast functionalities and to curb the natural dynamics, barrier coasts are often subject to human interventions. More recent examples include the jettification of inlets to improve the inlet navigability, dredging of shipping channels, sand nourishments to counteract erosion, and the artificial opening and closing of tidal inlets. Notwithstanding the abundance of human interventions, the knowledge necessary to effectively apply long-term management of these systems is lacking, leading to less efficient and more expensive short-term management decisions. In this thesis we support the shift from short-term management to more cost-efficient long-term management by expanding our knowledge on the long-term evolution of barrier coasts and answer the following research questions: 1. What is the influence of back-barrier basin planview geometry, and changes therein, on multiple inlet systems? 2. What is the impact of storm-induced breaches on multiple inlet systems, and how is this affected by climate change? 3. How do variations in back-barrier basin geometry and storm surge characteristics affect storm surges in the Western Dutch Wadden Sea? To answer the first research question, we extend an existing barrier coast model, to allow for the inclusion of arbitrary backbarrier basin geometries. Using this extended model, we studied the response of multiple inlet systems to variations in basin size and study the role of tidal resonance and bottom friction on this. We find that the total tidal prism through all inlets is predominantly determined by the (cross-shore) width of the basin and identify three regimes for this. Firstly, a linear regime for the shortest basins, followed by a resonant regime, and finally a regime in which the tidal wave dissipates due to bottom friction. To answer the second research question, we again extend an existing barrier coast model to include the formation of storm-induced breaches. Using this model, we perform Monte Carlo simulations to find how multiple inlet systems respond to storm-induced breaches. We found that if a barrier coast is in equilibrium, a new open inlet can cause the existing inlets to shrink. Furthermore, we find that the distance between a storm-induced breach and the existing neighbouring inlets is the most important predictor for whether an inlet remains open or not. Climate change driven changes in storm climate will result in changes in the time-scale in which these changes happen. To answer the third research question, we extend the historical model used to study the impact of a large closure dam in the Netherlands on the remaining barrier coast system. We found that the maximum surge height strongly depends on the length of the basin, as a longer basin results in a longer wind-fetch length. Original promotion date: January 13, 2022 (COVID-19)