A novel coastal landscape model for sandy systems

Community base for interdisciplinary research on coastal evolution

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DOI:

https://doi.org/10.47982/rius.7.135

Abstract

A common measure to mitigate erosion along sandy beaches is the implementation of sand nourishments. The design and societal acceptance of such a soft mitigation measure demands information on the expected evolution at various time scales ranging from a storm event to multiple decades. Process-based morphodynamic models are increasingly applied to obtain detailed information on temporal behaviour. This paper discusses the process-based morphodynamic model applied to the Sand Motor and how the morphodynamic forecasts have benefitted from the findings of an interdisciplinary research program called NatureCoast. The starting point is the morphodynamic prediction of the Sand Motor made for an Environmental Impact Assessment in 2008 before construction began. After the construction, the model computations were optimized using the first-year field measurements and insights by applying advanced model features. Next, an integrated model was developed that seamlessly predicts the morphodynamics in both the subaqueous and subaerial domains of the Sand Motor. Decadal predictions illustrate the need to be able to resolve the marine and aeolian processes simultaneously in one modelling framework in the case of dynamic coastal landscapes. Finally, a novel morphodynamic acceleration technique was developed that allows for predicting the morphodynamics for multiple decades while incorporating storm events in one simulation. Combining the above-mentioned developments has led to a unique, open-source, process-based landscape tool for (complex) coastal sandy systems, which can stimulate further collaboration between research communities. Moreover, this work demonstrates the evolution from mono- to interdisciplinary forecasts of coastal evolution.

Author Biography

Arjen Luijendijk, Delft University of Technology

Arjen Luijendijk is a coastal morphology specialist at Deltares and Delft University of Technology. His PhD focused on integrated model forecasts for nature-based solutions at sandy coasts. He also developed the world’s first global beach erosion map. He is currently working on predicting future behavior of the world’s beaches impacted by human developments and a changing climate.

A novel coastal landscape model for sandy systems

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Published

2021-02-18