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Water
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Sediment Dynamics and Related Bio-Physical Interactions of Coastal Wetlands
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Sediment Dynamics and Related Bio-Physical Interactions of Coastal Wetlands

A special issue of Water (ISSN 2073-4441). This special issue belongs to the section "Water Erosion and Sediment Transport".

Deadline for manuscript submissions: closed (20 November 2022) | Viewed by 1890

Special Issue Editor

Prof. Dr. Shilun Yang

E-Mail Website
Guest Editor
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
Interests: river hydrology; runoff and sediment load; dam impact on fluvial hydrology and geomorphology; estuary response to catchment change; delta erosion; storm impact on coastal processes; longshore sediment transport; wave attenuation in salt marshes

Special Issue Information

Dear Colleagues,

Coastal wetlands (tidal flats, salt marshes, and mangrove swamps) are typically composed of hydrographic net, fine-grained sediments, and diverse organisms. Sediment erosion, transport, and deposition in coastal wetlands are very frequent and active. Sediment dynamics usually influences and is influenced by benthic communities in coastal wetlands. Coastal wetlands worldwide are under a great deal of pressure from the dual forces of sea-level rise and human intervention. The conservation and restoration of coastal wetlands must be based on in-depth understanding of processes and mechanisms of morphological evolution and bio-physical interactions. Recent advancements in techniques for in situ observation (e.g., acoustic and optical instruments, pressure sensors, real-time kinematic GPS units) and monitoring (remote sensing, unmanned aerial vehicles) enable us to obtain high-resolution datasets of currents, waves, suspended sediment concentrations, bed-level changes, and evolution of vegetation cover, which are expected to improve research on coastal wetlands.

This Special Issue aims to advance our understanding of sediment dynamics and related biophysical interactions of coastal wetlands, including (but not limited to) hydrodynamics (currents, waves, bed shear stress), sediment transport and bed-level changes on multiple time scales (tidal cycle, neap-spring cycle, storm/calm weather period, seasonal cycle, long-term period), wave and flow attenuation within submerged vegetation canopies, sediment trapping in plant beds, benthos response to erosion and sedimentation, morphological responses to sea-level rise and fluvial sediment decline.

Prof. Dr. Shilun Yang
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Water is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • tidal flat
  • salt marsh
  • mangrove swamp
  • sediment transport
  • morphological evolution
  • biogeomorphology
  • biosedimentation
  • wave attenuation by macrophytes
  • benthos response to erosion and sedimentation
  • sediment trapping in plant beds

Published Papers (1 paper)

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Research

15 pages, 3897 KiB  
Article
Tidal Sediment Supply Maintains Marsh Accretion on the Yangtze Delta despite Rising Sea Levels and Falling Fluvial Sediment Input
by Peng Li, Benwei Shi, Guoxiang Wu, Wenxiang Zhang, Sijian Wang, Long Li, Linghao Kong and Jin Hu
Water 2022, 14(22), 3768; https://doi.org/10.3390/w14223768 - 20 Nov 2022
Viewed by 1617
Abstract
Tidal marshes are among the world’s most valuable ecosystems; however, they are increasingly threatened by rising sea levels and a decline in fluvial sediment supply. The survival of a tidal marsh under these twin threats depends upon the net input of tidal sediments, [...] Read more.
Tidal marshes are among the world’s most valuable ecosystems; however, they are increasingly threatened by rising sea levels and a decline in fluvial sediment supply. The survival of a tidal marsh under these twin threats depends upon the net input of tidal sediments, because this will determine the deposition rate. The rate of relative sea level rise currently affecting the Yangtze Delta is rapid (~4 mm/a), and the sediment discharge from the Yangtze River has decreased by >70% over recent decades. In order to improve our understanding of the response of the marshes in the turbid zone of the Yangtze Estuary to these changing environmental conditions, we measured sediment transport in and out of a tidal basin and calculated the deposition rate over eight tidal cycles covering different tidal ranges during the summer and winter seasons. The suspended sediment concentration (SSC) during the flood phase of the tidal cycle (average = 0.395 kg/m3) was markedly higher than that during the ebb (average = 0.164 kg/m3), although water transport during the flood tide was almost equivalent to that during the ebb. As a result, ~40% of the sediment inflow during the flood phase was retained within the marsh. This reason is mainly attributable to the dense marsh vegetation, which attenuates waves and currents and to which the sediments adhere. The annual deposition rate in the marsh was approximately 6.7 mm/a. These findings indicate that under the combined influence of sea level rise and river sediment supply reduction, the sediment transport through the turbidity maximum zone of the Yangtze River estuary could maintain the relative stability of the marsh area to a certain extent. Full article
(This article belongs to the Special Issue Sediment Dynamics and Related Bio-Physical Interactions of Coastal Wetlands)
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