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J. Mar. Sci. Eng. 2018, 6(3), 79;

Significance of Fluvial Sediment Supply in Coastline Modelling at Tidal Inlets

Department of Water Science and Engineering, IHE Delft Institute for Water Education, P.O. Box 3015, 2601 DA Delft, The Netherlands
Department of Water Engineering and Management, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
Applied Morphodynamics, Deltares, P.O. Box 177, 2600 MH Delft, The Netherlands
Department of Physical Geography, Faculty of Geosciences, Utrecht University, P.O. Box 80115, 3508 TC Utrecht, The Netherlands
Author to whom correspondence should be addressed.
Received: 31 May 2018 / Revised: 22 June 2018 / Accepted: 22 June 2018 / Published: 3 July 2018
(This article belongs to the Special Issue Climate Change, Coasts and Coastal Risk)
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The sediment budget associated with future coastline change in the vicinity of tidal inlets consists of four components; sea level rise-driven landward movement of the coastline (i.e., the Bruun effect), basin infilling effect due to sea level rise-induced increase in accommodation space, basin volume change due to variation in river discharge, and coastline change caused by change in fluvial sediment supply. These four components are affected by climate change and/or anthropogenic impacts. Despite this understanding, holistic modelling techniques that account for all the aforementioned processes under both climate change and anthropogenic influences are lacking. This manuscript presents the applications of a newly-developed reduced complexity modelling approach that accounts for both climate change and anthropogenically-driven impacts on future coastline changes. Modelled results corresponding to the year 2100 indicate considerable coastline recessions at Wilson Inlet (152 m) and the Swan River system (168 m) in Australia and Tu Hien Inlet (305 m) and Thuan An Inlet (148 m) in Vietnam. These results demonstrate that coastline models should incorporate both climate change and anthropogenic impacts to quantify future changes in fluvial sediment supply to coasts to achieve better estimates of total coastline changes at tidal inlets. Omission of these impacts is one of the major drawbacks in all the existing coastline models that simulate future coastline changes at tidal inlets. A comparison of these modelled future coastline changes with the predictions made by a relevant existing modelling technique (Scale Aggregated Model for Inlet-interrupted Coasts (SMIC)) indicates that the latter method overestimates total coastline recessions at the Swan River system, and the Tu Hien and Thuan An Inlets by 7%, 10%, and 30%, respectively, underlining the significance of integrating both climate change and anthropogenic impacts to assess future coastline changes at tidal inlets. View Full-Text
Keywords: coastline modelling; inlet-affected coastlines; fluvial sediment supply; climate change impacts; anthropogenic impacts coastline modelling; inlet-affected coastlines; fluvial sediment supply; climate change impacts; anthropogenic impacts

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Bamunawala, J.; Maskey, S.; Duong, T.M.; Van der Spek, A. Significance of Fluvial Sediment Supply in Coastline Modelling at Tidal Inlets. J. Mar. Sci. Eng. 2018, 6, 79.

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