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Assessing the relative contributions of the flood tide and the ebb tide to tidal channel network dynamics
Author(s) -
Geng Liang,
Gong Zheng,
Zhou Zeng,
Lanzoni Stefano,
D'Alpaos Andrea
Publication year - 2020
Publication title -
earth surface processes and landforms
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.294
H-Index - 127
eISSN - 1096-9837
pISSN - 0197-9337
DOI - 10.1002/esp.4727
Subject(s) - flood myth , current (fluid) , channel (broadcasting) , submarine pipeline , geology , structural basin , tidal current , erosion , flow (mathematics) , oceanography , beach morphodynamics , hydrology (agriculture) , sediment , sediment transport , geomorphology , geotechnical engineering , geography , physics , archaeology , engineering , electrical engineering , mechanics
Flood and ebb currents provide different contributions to the initiation and evolution of tidal channel networks, generating diverse network structures and channel cross‐sections. In order to separate the effects of these contributions, a physical model of a sloping tidal‐flat basin was set up in the laboratory. Depending on the degree of tidal asymmetry imposed offshore, either flood or ebb currents can be enhanced. The experimental results show that the ebb current has a higher capability to initiate and shape tidal networks than the flood current. Headward erosion is mainly induced by the ebb flow. The slightly inclined flat surface tends to reduce the energy of the flood current and to enhance the ebb current, thus prolonging the duration of morphodynamic activity as well as sediment motion. Overall, flood‐dominated tides favour the formation of small‐scale channel branches in the upper basin zone, while long lasting ebb‐dominated tides result in more complex, wider and deeper tidal networks. © 2019 John Wiley & Sons, Ltd.