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A First-Order, Morphological Response Model (FORM) for predicting hydrologically induced bathymetric change in coastal-plain estuaries

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Kidd, IM, Davis, J and Fischer, A ORCID: 0000-0001-5284-6428 2017 , 'A First-Order, Morphological Response Model (FORM) for predicting hydrologically induced bathymetric change in coastal-plain estuaries' , Journal of Coastal Research, vol. 33, no. 2 , pp. 468-480 , doi: 10.2112/JCOASTRES-D-16-00011.1.

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Abstract

Estuarine hydrodynamic modeling is complex, and predicting bathymetric outcomes from imposed hydrological changes requires models to encompass time periods spanning years, decades, or longer. Within this work, a first-order response model (FORM) was developed that doesn't require temporal or process components and represents a considerable computational saving compared with two-dimensional/three-dimensional morphodynamic models. FORM enables a final regime to be predicted using knowledge of only the initial regime and the causal change in the tidal prism. It builds on the power width/distance relationship (y = axn) for a simple estuary and allows for the addition of storages or tributaries. FORM was validated using data from 2004 and pre-1968 for the Petitcodiac River, New Brunswick, Canada, where considerable bathymetric change has occurred because of the Moncton Barrage. Linear regression of the modeled upper Tamar River estuary, Tasmania, Australia, revealed a significant and positive relationship between the predicted and actual estuarine widths (R2 = 0.89 p 6 m3) was within the range of the observed volume of accretion since 1806 (10.0 × 106–15.0 × 106 m3). The model extends the applicability of existing regime models to similar coastal-plain estuaries composed of multiple tributaries, channels, and storages, regardless of synchronicity.

Item Type: Article
Authors/Creators:Kidd, IM and Davis, J and Fischer, A
Keywords: Tidal prism, siltation, wetlands, tidal flats, allometry, regime theory
Journal or Publication Title: Journal of Coastal Research
Publisher: Coastal Education & Research Foundation
ISSN: 0749-0208
DOI / ID Number: 10.2112/JCOASTRES-D-16-00011.1
Copyright Information:

Copyright 2016 Coastal Education and Research Foundation, Inc.

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