Two-dimensional equilibrium morphological modelling of a tidal inlet: an entropy based approach |
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Authors: | Joanna Marie Nield David John Walker Martin Francis Lambert |
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Institution: | (1) School of Civil and Environmental Engineering, The University of Adelaide, 5005 Adelaide, South Australia, Australia |
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Abstract: | The management of tidal inlets requires the accurate prediction of equilibrium morphologies. In areas where the flow from
rivers is highly regulated, it is important to give decision makers the ability to determine optimal flow management schemes,
in order to allow tidal inlets to function as naturally as possible, and minimise the risk of inlet closure. The River Murray
Mouth in South Australia is one such problem area. Drought and the retention of water for irrigation and urban water consumption
have limited the amount of water entering the estuary. As a result, sediment from the coastal environment is being deposited
in the mouth of the estuary, reducing the effect of further coastal interactions. Currently, situations such as this are modelled
using traditional process-based methods, where wave, current, sediment transport and sediment balance modules are linked together
in a time-stepping process. The modules are reapplied and assessed until a stable morphology is formed. In this paper, new
options for modelling equilibrium morphologies of tidal inlets are detailed, which alleviate some of the shortfalls of traditional
process-based models, such as the amplification of small errors and reliance on initial conditions. The modelling problem
is approached in this paper from a different angle and involves the use of entropy based objective functions, which are optimised
in order to find equilibrium morphologies. In this way, characteristics of a system at equilibrium can be recognised and a
stable system predicted without having to step through time. This paper also details the use of self-organisation based modelling
methods, another non-traditional model application, where local laws and feedback result in the formation of a global stable
equilibrium morphology. These methods represent a different approach to traditional models, without some of the characteristics
that may add to their limitations.
Responsible Editor: Alejandro Souza |
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Keywords: | Tidal inlet Morphological modelling Optimisation Entropy Self-organisation |
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