Print Email Facebook Twitter On the stability relations between tidal asymmetry and morphologies of tidal basins and estuaries Title On the stability relations between tidal asymmetry and morphologies of tidal basins and estuaries Author Zhou, Zeng Coco, Giovanni (The University of Auckland) Townend, Ian (University of Southampton) Gong, Zheng Wang, Zhengbing (TU Delft Coastal Engineering) Zhang, Changkuan Date 2018-03-30 Abstract Simple stability relationships are practically useful to provide a rapid assessment of coastal and estuarine landforms in response to human interventions and long‐term climate change. In this contribution, we review a variety of simple stability relationships which are based on the analysis of tidal asymmetry (shortened to “TA”). Most of the existing TA‐based stability relationships are derived using the one‐dimensional tidal flow equations assuming a certain regular shape of the tidal channel cross‐sections. To facilitate analytical solutions, specific assumptions inevitably need to be made e.g. by linearising the friction term and dropping some negligible terms in the tidal flow equations. We find that three major types of TA‐based stability relationships have been proposed between three non‐dimensional channel geometric ratios (represented by the ratio of channel widths, ratio of wet surface areas and ratio of storage volumes) and the tide‐related parameter a/h (i.e. the ratio between tidal amplitude and mean water depth). Based on established geometric relations, we use these non‐dimensional ratios to re‐state the existing relationships so that they are directly comparable. Available datasets are further extended to examine theutility of these TA‐based relationships. Although a certain agreement is shown for these relationships, we also observe a large scatter of data points which are collected in different types of landscape, hydrodynamic and sedimentologic settings over the world. We discuss in detail the potential reasons for this large scatter and subsequently elaborate on the limited applicability of the various TA‐based stability relationships for practical use. We highlight the need to delve further into what constitutes equilibrium and what is needed to develop more robust measures to determine the morphological state of these systems. Subject tidal basinsestuarine morphologiestidal asymmetrystability relationships To reference this document use: http://resolver.tudelft.nl/uuid:b867135c-0df5-439a-a0f7-702d4f67a593 DOI https://doi.org/10.1002/esp.4366 Embargo date 2019-04-01 ISSN 0197-9337 Source Earth Surface Processes and Landforms, 43 (9), 1943-1959 Part of collection Institutional Repository Document type journal article Rights © 2018 Zeng Zhou, Giovanni Coco, Ian Townend, Zheng Gong, Zhengbing Wang, Changkuan Zhang Files PDF StabilityRelationRv1s.pdf 1.13 MB Close viewer /islandora/object/uuid:b867135c-0df5-439a-a0f7-702d4f67a593/datastream/OBJ/view