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Hydro-morphological modelling of small, wave-dominated estuaries. / Slinger, Jill H.

In: Estuarine, Coastal and Shelf Science, 2016, p. -.

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Slinger, Jill H. / Hydro-morphological modelling of small, wave-dominated estuaries. In: Estuarine, Coastal and Shelf Science. 2016 ; pp. -.

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@article{990c158ddec7409dbd80a2828b6b1334,
title = "Hydro-morphological modelling of small, wave-dominated estuaries",
abstract = "Small, intermittently open or closed estuaries are characteristic of the coasts of South Africa, Australia, California, Mexico and many other areas of the world. However, modelling attention has tended to focus on big estuaries that drain large catchments and serve a wide diversity of interests e.g. agriculture, urban settlement, recreation, commercial fishing. In this study, the development of a simple, parametric, system dynamics model to simulate the opening and closure of the mouths of small, wave-dominated estuaries is reported. In the model, the estuary is conceived as a basin with a specific water volume to water level relationship, connected to the sea by a channel of fixed width, but variable sill height. Changes in the form of the basin are not treated in the model, while the dynamics of the mouth channel are central to the model. The magnitude and direction of the flow through the mouth determines whether erosion or deposition of sediment occurs in the mouth channel, influencing the sill height. The model is implemented on the Great Brak Estuary in South Africa and simulations reveal that the raised low water levels in the estuary during spring tide relative to neap tide, are occasioned by the constriction of the tidal flow through the shallow mouth. Freshwater inflows to the estuary are shown to be significant in determining the behaviour of the inlet mouth, a factor often ignored in studies on tidal inlets. Further it is the balance between freshwater inflows and wave events that determines the opening or closure of the mouth of a particular estuary.",
keywords = "Intermittently open estuary, Episodic closure, Parametric modelling, Bar-built, Tidal inlet, Freshwater flows, Climate change, South Africa",
author = "Slinger, {Jill H.}",
year = "2016",
doi = "10.1016/j.ecss.2016.10.038",
language = "English",
pages = "--",
journal = "Estuarine, Coastal and Shelf Science",
issn = "0272-7714",
publisher = "Academic Press",

}

RIS

TY - JOUR

T1 - Hydro-morphological modelling of small, wave-dominated estuaries

AU - Slinger, Jill H.

PY - 2016

Y1 - 2016

N2 - Small, intermittently open or closed estuaries are characteristic of the coasts of South Africa, Australia, California, Mexico and many other areas of the world. However, modelling attention has tended to focus on big estuaries that drain large catchments and serve a wide diversity of interests e.g. agriculture, urban settlement, recreation, commercial fishing. In this study, the development of a simple, parametric, system dynamics model to simulate the opening and closure of the mouths of small, wave-dominated estuaries is reported. In the model, the estuary is conceived as a basin with a specific water volume to water level relationship, connected to the sea by a channel of fixed width, but variable sill height. Changes in the form of the basin are not treated in the model, while the dynamics of the mouth channel are central to the model. The magnitude and direction of the flow through the mouth determines whether erosion or deposition of sediment occurs in the mouth channel, influencing the sill height. The model is implemented on the Great Brak Estuary in South Africa and simulations reveal that the raised low water levels in the estuary during spring tide relative to neap tide, are occasioned by the constriction of the tidal flow through the shallow mouth. Freshwater inflows to the estuary are shown to be significant in determining the behaviour of the inlet mouth, a factor often ignored in studies on tidal inlets. Further it is the balance between freshwater inflows and wave events that determines the opening or closure of the mouth of a particular estuary.

AB - Small, intermittently open or closed estuaries are characteristic of the coasts of South Africa, Australia, California, Mexico and many other areas of the world. However, modelling attention has tended to focus on big estuaries that drain large catchments and serve a wide diversity of interests e.g. agriculture, urban settlement, recreation, commercial fishing. In this study, the development of a simple, parametric, system dynamics model to simulate the opening and closure of the mouths of small, wave-dominated estuaries is reported. In the model, the estuary is conceived as a basin with a specific water volume to water level relationship, connected to the sea by a channel of fixed width, but variable sill height. Changes in the form of the basin are not treated in the model, while the dynamics of the mouth channel are central to the model. The magnitude and direction of the flow through the mouth determines whether erosion or deposition of sediment occurs in the mouth channel, influencing the sill height. The model is implemented on the Great Brak Estuary in South Africa and simulations reveal that the raised low water levels in the estuary during spring tide relative to neap tide, are occasioned by the constriction of the tidal flow through the shallow mouth. Freshwater inflows to the estuary are shown to be significant in determining the behaviour of the inlet mouth, a factor often ignored in studies on tidal inlets. Further it is the balance between freshwater inflows and wave events that determines the opening or closure of the mouth of a particular estuary.

KW - Intermittently open estuary

KW - Episodic closure

KW - Parametric modelling

KW - Bar-built

KW - Tidal inlet

KW - Freshwater flows

KW - Climate change

KW - South Africa

UR - http://resolver.tudelft.nl/uuid:990c158d-dec7-409d-bd80-a2828b6b1334

U2 - 10.1016/j.ecss.2016.10.038

DO - 10.1016/j.ecss.2016.10.038

M3 - Article

SP - -

JO - Estuarine, Coastal and Shelf Science

T2 - Estuarine, Coastal and Shelf Science

JF - Estuarine, Coastal and Shelf Science

SN - 0272-7714

ER -

ID: 9620579