Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Combined longshore and cross-shore shoreline model for closed embayed beaches
https://orcid.org/0000-0003-2247-8016
Abstract This research focuses on the development of a simple and efficient transect based long-term shoreline model. The new modeling tool is a combination of a model for the shoreline changes due to the gradients in longshore drift and a heuristic cross-shore shoreline model. The cross-shore part of the model uses an up-to-date semi-empirical shoreline evolution model based on the equilibrium beach state assumption. A physics-based longshore shoreline model is developed on the same premises as the one-line type approach based on the longshore sand budget and assumes no loss of sediment of the embayed system. The derivation of the longshore part of the model explicitly decouples the average shoreline position from its fluctuating components. An important result is that the equilibrium shoreline orientation is shown to depend on the time correlation between the incoming wave power and the difference between the instantaneous and the time average wave incidence. As a test case, the combined shoreline model is calibrated with the wave and shoreline data of the embayed beach of Narrabeen, Australia. A separate analysis of each contribution reveals that the long-term trend is mostly a longshore drift contribution and surprisingly, part of seasonal shoreline variability is attributed to longshore drift processes.
Highlights New longterm shoreline modeling combining cross-shore and longshore contributions. Longshore model derives from an alongshore sand budget and transport formula. Model is calibrated with the embayed Narrabeen beach data. Longshore contributions to shoreline motions are on time scales of month to years.
Combined longshore and cross-shore shoreline model for closed embayed beaches
https://orcid.org/0000-0003-2247-8016
Abstract This research focuses on the development of a simple and efficient transect based long-term shoreline model. The new modeling tool is a combination of a model for the shoreline changes due to the gradients in longshore drift and a heuristic cross-shore shoreline model. The cross-shore part of the model uses an up-to-date semi-empirical shoreline evolution model based on the equilibrium beach state assumption. A physics-based longshore shoreline model is developed on the same premises as the one-line type approach based on the longshore sand budget and assumes no loss of sediment of the embayed system. The derivation of the longshore part of the model explicitly decouples the average shoreline position from its fluctuating components. An important result is that the equilibrium shoreline orientation is shown to depend on the time correlation between the incoming wave power and the difference between the instantaneous and the time average wave incidence. As a test case, the combined shoreline model is calibrated with the wave and shoreline data of the embayed beach of Narrabeen, Australia. A separate analysis of each contribution reveals that the long-term trend is mostly a longshore drift contribution and surprisingly, part of seasonal shoreline variability is attributed to longshore drift processes.
Highlights New longterm shoreline modeling combining cross-shore and longshore contributions. Longshore model derives from an alongshore sand budget and transport formula. Model is calibrated with the embayed Narrabeen beach data. Longshore contributions to shoreline motions are on time scales of month to years.
Combined longshore and cross-shore shoreline model for closed embayed beaches
https://orcid.org/0000-0003-2247-8016
Abstract This research focuses on the development of a simple and efficient transect based long-term shoreline model. The new modeling tool is a combination of a model for the shoreline changes due to the gradients in longshore drift and a heuristic cross-shore shoreline model. The cross-shore part of the model uses an up-to-date semi-empirical shoreline evolution model based on the equilibrium beach state assumption. A physics-based longshore shoreline model is developed on the same premises as the one-line type approach based on the longshore sand budget and assumes no loss of sediment of the embayed system. The derivation of the longshore part of the model explicitly decouples the average shoreline position from its fluctuating components. An important result is that the equilibrium shoreline orientation is shown to depend on the time correlation between the incoming wave power and the difference between the instantaneous and the time average wave incidence. As a test case, the combined shoreline model is calibrated with the wave and shoreline data of the embayed beach of Narrabeen, Australia. A separate analysis of each contribution reveals that the long-term trend is mostly a longshore drift contribution and surprisingly, part of seasonal shoreline variability is attributed to longshore drift processes.
Highlights New longterm shoreline modeling combining cross-shore and longshore contributions. Longshore model derives from an alongshore sand budget and transport formula. Model is calibrated with the embayed Narrabeen beach data. Longshore contributions to shoreline motions are on time scales of month to years.
Combined longshore and cross-shore shoreline model for closed embayed beaches
Tran, Yen Hai (Autor:in) / Barthélemy, Eric (Autor:in)
Coastal Engineering ; 158
10.03.2020
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Accretion , Cross-shore , Empirical model , Erosion , Longshore , One-line
Bar and Shoreline Coupling in Artificial Embayed Beaches
| British Library Conference Proceedings | 2007
Stochastic Model for Embayed Beaches
| Online Contents | 2009
Stochastic Model for Embayed Beaches
| British Library Online Contents | 2009