Dune erosion during storm surges: A review of the observations, physics and modelling of the collision regime

Dune erosion during storm surges can lead to excessive damage to the dune system with devastating floods as a potential consequence. A risk assessment of areas protected by dunes can be facilitated by an understanding and description of the physical processes that take place. Field measurements, knowledge of underlying processes and numerical...

Modelling Scour in Front of Dune Revetments in a Surf-beat Model

This paper presents adaptations to the XBeach model aimed at including the relevant processes for the generation of scour holes at the toe of a revetment. Dutch assessment rules for the safety of sea defenses need to be adjusted to cope with a combination of sandy dunes and hard elements. To that end, the XBeach model is prepared to be...

The role of bathymetry, wave obliquity and coastal curvature in dune erosion prediction

This study aims at reducing uncertainty in dune erosion predictions, in particular at complex dune coasts, in order to improve the assessment method for dune safety against flooding. To that end, state-of-the-art process-based dune erosion models are employed to further investigate issues insufficiently covered by the current Dutch safety...

Sensitivity of dune erosion prediction during extreme conditions

Coastal dunes play an important role in protecting low-lying hinterland from flooding. In The Netherlands, dunes form the major part of the primary sea defence, that protects half of the population and over two-third of the economy from the sea. To design and maintain coastal dunes that properly protect the hinterland, a regular safety...

Development and field validation of a 2DH curvilinear storm impact model

The formulations of the 2DH process-based, nearshore morphological model XBeach were extended to allow for curvilinear grids using a finite volume approach. The formulations were tested for schematic cases such as a circular island and a field validation study was carried out for the case of storm erosion during a construction phase of the soft...

Modelling storm impact on complex coastlines: Westkapelle, The Netherlands

Regular dune safety assessments in the Netherlands are presently based on a 1D model approach, which is insufficiently applicable for more complex coastal areas with structures, tidal channels or spatially strong varying bathymetry. These situations require more advanced methods to assess the safety in dune areas. In this study a 2DH XBeach...

Dune erosion near sea walls: Model-data comparison

This paper describes the validation of the dune erosion model XBeach with laboratory measurement data of dune erosion in the presence of sea walls and revetments. Simulation results show that the essential dune set back processes are captured by the model and that the measurements at most locations are approximated quite well. Some aspects...

Modelling dune erosion, overwash and inundation of barrier islands

Physical model experiments are performed at Deltares to investigate the morphological response of barrier islands on extreme storm events. The experiments included dune erosion, overwash and inundation regimes. Extensive measurement techniques made detailed comparison with numerical models possible. This paper describes the comparison between...

Impact assessment of extreme storm events using a Bayesian network

This paper describes an investigation on the usefulness of Bayesian Networks in the safety assessment of dune coasts. A network has been created that predicts the erosion volume based on hydraulic boundary conditions and a number of cross-shore profile indicators. Field measurement data along a large part of the Dutch coast has been used to...

The effect of the longshore dimension on dune erosion

The effect of the longshore dimension on dune erosion is examined numerically with a 2DH process based model XBeach. Exploratory simulations are presented to examine longshore effects due to directionally spread waves, longshore variation in topography and longshore variation in bathymetry. The simulations reveal that alongshore sediment...

Reliability of dune erosion assessment along curved coastlines

The dune assessment methods used to ensure the safety of the lower areas in The Netherlands are based on simple empirical relations that are, strictly speaking, only valid for infinitely long, uniform and straight coasts. The wide application of these relations is mainly justified due to intentional overestimation of the expected dune erosion....

Dune erosion during storm surges

Large parts of The Netherlands are protected from flooding by a narrow strip of sandy beaches and dunes. The aim of this thesis is to extend the existing knowledge of dune erosion during storm surges as it occurs along the Dutch coast. The thesis discusses: • A large scale dune erosion experiment to obtain better insight in near dune...

Reducing uncertainty in prediction of dune erosion during extreme conditions

Coastal dunes protect low lying coastal areas against the sea. Extreme waves and water levels during severe storms may cause breaching of the dunes. Consequently, serious damage due to flooding and direct wave attack could occur, resulting in loss of life and property. Proper coastal management implies that reinforcement measures will be taken...

Probabilistic sensitivity analysis of dune erosion calculations

Coastal dunes protect low lying coastal areas against the sea. Extreme waves and water levels during severe storms may cause breaching of the dunes. Consequently, serious damage due to flooding and direct wave attack could occur, resulting in loss of life and property. Proper coastal management implies that reinforcement measures will be taken...

Vergelijking van afslagrisico's kustzone met risico's elders in Nederland

Om een beeld te krijgen van de relatieve omvang van het risico verbonden met afslag aan de kust heeft RIKZ het initiatief genomen voor het laten uitvoeren van een onderzoek gericht op een vergelijking van de risico’s in de afslagzone met watergebonden risico’s elders in Nederland. Met watergebonden risico’s worden de risico’s bij overstroming...

The influence on the environment of coastal structures recently built in the Netherlands

In the Netherlands today much attention is paid to the effect of coastal structures on the environment. In the past it was usual to quantify the effect of such a structure on its environment solely with the purpose of deciding whether that effect could imply any hazard to the structure itself (or to structures in the neighbourhood). Nowadays...

Probabilistische methoden bij het ontwerpen van duinafslag

This report provides the background of the Dutch guidelines on dune erosion (Leidraad Duinafslag). In these guidelines a probabilistic level 1 approach is used. The required calibration parameters are determined in this research report. A large number of probabilistic computations have been made in order to calibrate the level 1 approach in the...