The effects of beach width variability on coastal dune development at decadal scales

Filipe Galiforni Silva (Corresponding Author), Kathelijne M. Wijnberg, Alma V. de Groot, Suzanne J.M.H. Hulscher

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Abstract

A cellular automata model is used to evaluate, over decadal time spans, the effect of beach width changes on the development of coastal dune systems. The model includes the effects of aeolian transport, hydrodynamic erosion and accretion, groundwater and vegetation growth. Simulations using fixed and mobile beach widths scenarios were carried out for a 90-year period. Unlimited and limited sediment supply conditions were regulated by groundwater depth. The final topographies were compared based on morphological characteristics such as dunefoot position and volume increase. Results show that there is a preferential cross-shore position where the foredune tends to be built which is a function of beach width and sediment supply. For narrow beaches, foredunes tend to develop at higher elevations than for wide beaches due to differences in wave dissipation, whereas dune volume is controlled by hydrodynamic erosion and dune recovery potential by sediment supply. Furthermore, if sediment supply is limited, the effect of beach width on dune volume only appears for beach widths greater than 300 m, suggesting that limitation in supply can dominate dune growth on regular beaches whereas on wide systems, such as sand flats and spits, beach width size dominates. These results suggest that for a decadal scale, beach width controls the space available for dune formation, thus the position of the most seaward dune, but the effect of beach width on dune volume can be overruled by other supply limiting conditions such as groundwater depth.

Original languageEnglish
Pages (from-to)58-69
Number of pages12
JournalGeomorphology
Volume329
Early online date28 Dec 2018
DOIs
Publication statusPublished - 15 Mar 2019

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dune
beach
sediment
groundwater
effect
hydrodynamics
dune formation
erosion
cellular automaton
spit
dissipation
accretion
topography
vegetation

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title = "The effects of beach width variability on coastal dune development at decadal scales",
abstract = "A cellular automata model is used to evaluate, over decadal time spans, the effect of beach width changes on the development of coastal dune systems. The model includes the effects of aeolian transport, hydrodynamic erosion and accretion, groundwater and vegetation growth. Simulations using fixed and mobile beach widths scenarios were carried out for a 90-year period. Unlimited and limited sediment supply conditions were regulated by groundwater depth. The final topographies were compared based on morphological characteristics such as dunefoot position and volume increase. Results show that there is a preferential cross-shore position where the foredune tends to be built which is a function of beach width and sediment supply. For narrow beaches, foredunes tend to develop at higher elevations than for wide beaches due to differences in wave dissipation, whereas dune volume is controlled by hydrodynamic erosion and dune recovery potential by sediment supply. Furthermore, if sediment supply is limited, the effect of beach width on dune volume only appears for beach widths greater than 300 m, suggesting that limitation in supply can dominate dune growth on regular beaches whereas on wide systems, such as sand flats and spits, beach width size dominates. These results suggest that for a decadal scale, beach width controls the space available for dune formation, thus the position of the most seaward dune, but the effect of beach width on dune volume can be overruled by other supply limiting conditions such as groundwater depth.",
author = "{Galiforni Silva}, Filipe and Wijnberg, {Kathelijne M.} and {de Groot}, {Alma V.} and Hulscher, {Suzanne J.M.H.}",
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The effects of beach width variability on coastal dune development at decadal scales. / Galiforni Silva, Filipe (Corresponding Author); Wijnberg, Kathelijne M.; de Groot, Alma V.; Hulscher, Suzanne J.M.H.

In: Geomorphology, Vol. 329, 15.03.2019, p. 58-69.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - The effects of beach width variability on coastal dune development at decadal scales

AU - Galiforni Silva, Filipe

AU - Wijnberg, Kathelijne M.

AU - de Groot, Alma V.

AU - Hulscher, Suzanne J.M.H.

PY - 2019/3/15

Y1 - 2019/3/15

N2 - A cellular automata model is used to evaluate, over decadal time spans, the effect of beach width changes on the development of coastal dune systems. The model includes the effects of aeolian transport, hydrodynamic erosion and accretion, groundwater and vegetation growth. Simulations using fixed and mobile beach widths scenarios were carried out for a 90-year period. Unlimited and limited sediment supply conditions were regulated by groundwater depth. The final topographies were compared based on morphological characteristics such as dunefoot position and volume increase. Results show that there is a preferential cross-shore position where the foredune tends to be built which is a function of beach width and sediment supply. For narrow beaches, foredunes tend to develop at higher elevations than for wide beaches due to differences in wave dissipation, whereas dune volume is controlled by hydrodynamic erosion and dune recovery potential by sediment supply. Furthermore, if sediment supply is limited, the effect of beach width on dune volume only appears for beach widths greater than 300 m, suggesting that limitation in supply can dominate dune growth on regular beaches whereas on wide systems, such as sand flats and spits, beach width size dominates. These results suggest that for a decadal scale, beach width controls the space available for dune formation, thus the position of the most seaward dune, but the effect of beach width on dune volume can be overruled by other supply limiting conditions such as groundwater depth.

AB - A cellular automata model is used to evaluate, over decadal time spans, the effect of beach width changes on the development of coastal dune systems. The model includes the effects of aeolian transport, hydrodynamic erosion and accretion, groundwater and vegetation growth. Simulations using fixed and mobile beach widths scenarios were carried out for a 90-year period. Unlimited and limited sediment supply conditions were regulated by groundwater depth. The final topographies were compared based on morphological characteristics such as dunefoot position and volume increase. Results show that there is a preferential cross-shore position where the foredune tends to be built which is a function of beach width and sediment supply. For narrow beaches, foredunes tend to develop at higher elevations than for wide beaches due to differences in wave dissipation, whereas dune volume is controlled by hydrodynamic erosion and dune recovery potential by sediment supply. Furthermore, if sediment supply is limited, the effect of beach width on dune volume only appears for beach widths greater than 300 m, suggesting that limitation in supply can dominate dune growth on regular beaches whereas on wide systems, such as sand flats and spits, beach width size dominates. These results suggest that for a decadal scale, beach width controls the space available for dune formation, thus the position of the most seaward dune, but the effect of beach width on dune volume can be overruled by other supply limiting conditions such as groundwater depth.

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