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Hydro-Sediment Dynamics in Vegetated Rivers
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Hydro-Sediment Dynamics in Vegetated Rivers

A special issue of Water (ISSN 2073-4441). This special issue belongs to the section "Hydraulics and Hydrodynamics".

Deadline for manuscript submissions: closed (20 June 2024) | Viewed by 3188

Special Issue Editors

Prof. Dr. Chao Liu

E-Mail Website
Guest Editor
State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, China
Interests: hydrodynamics of vegetated flow; open channel flow; sediment transport; modeling; vegetated landscape evolution
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Kejun Yang

E-Mail Website
Guest Editor
State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, China
Interests: compound channel flow; vegetation hydrodynamics; sediment transport; modeling; fluvial processes
Special Issues, Collections and Topics in MDPI journals
Dr. Yuqi Shan

E-Mail Website
Guest Editor
Institute for Disaster Management and Reconstruction, Sichuan University, Chengdu, China
Interests: hydrodynamics of vegetated flow; ecological disaster prevention; disaster mitigation; sediment loss; modeling
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Vegetation is widely present in rivers. Due to vegetation drag, flow hydrodynamics and sediment transport alter and tend to impact the landscape evolution in vegetated rivers. Vegetation can promote sediment deposition and prevent riverbed erosion by decreasing in-canopy flow velocity and turbulent kinematic energy. Vegetation can also improve water quality by absorbing nutrients and organic matter, which is beneficial to the water environment. Due to environment changes and anthropogenic activities, a lot of rivers have a diminished upstream sediment supply that has a significant impact on riverbed evolutions. Many river restoration projects employ vegetation to stabilize riverbeds and retain sediment, but some projects fail because the interaction between flow, vegetation and sediment is not clear. Therefore, understanding hydrodynamics and sediment dynamics in vegetated rivers is very important to river restoration and protection.

This Special Issue will focus on hydro-sediment dynamics in vegetated rivers but is not limited to this topic. For example, flood control in vegetated rivers, the ecological environment in vegetated regions, and the simulation of vegetated landscapes are also very welcome topics. We sincerely invite researchers to submit their experimental, numerical, theoretical, and field studies regarding hydrodynamics and sediment dynamics in vegetated rivers.

Please feel free to contact us if you are interested in this Special Issue.

Prof. Dr. Chao Liu
Prof. Dr. Kejun Yang
Dr. Yuqi Shan
Guest Editors

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

  • vegetated rivers
  • hydrodynamics
  • sediment transport
  • bed morphology
  • river evolution
  • numerical simulation
  • analytical method
  • laboratory investigation
  • field study

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Published Papers (2 papers)

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Research

14 pages, 5203 KiB  
Article
Effect of Aeration on the Cavitation Characteristics of the Control Valve in Hydro-Driven Ship Lifts
by Jiao Wang, Yaan Hu, Liang Chen, Ruichang Hu and Hao Yuan
Water 2023, 15(22), 4014; https://doi.org/10.3390/w15224014 - 19 Nov 2023
Cited by 2 | Viewed by 1577
Abstract
In hydro-driven ship lifts, plunger valves and fixed cone valves are the most suitable structures for achieving accurate flow control under a wide range of flow conditions. In order to inhibit cavitation in these valve structures, experiments were conducted in which forced aeration [...] Read more.
In hydro-driven ship lifts, plunger valves and fixed cone valves are the most suitable structures for achieving accurate flow control under a wide range of flow conditions. In order to inhibit cavitation in these valve structures, experiments were conducted in which forced aeration was applied before the valve. The cavitation phenomena and aerated flow regime were observed through a transparent glass pipe, and the cavitation noise characteristics were recorded using a hydrophone. The test results show that aeration can reduce the valve working cavitation number, albeit to a limited degree (<5%). Based on the sound velocity theory of aerated flow and the experimental results, the relationship between the aeration concentration and the cavitation inhibition efficiency was obtained. When the aeration concentration is approximately 0.1%, cavitation can be significantly inhibited via forced aeration before the valve. Once the aeration concentration reaches 0.9%, the cavitation inhibition efficiency becomes saturated. The research results presented in this paper provide a reference for the cavitation inhibition of industrial valves. Full article
(This article belongs to the Special Issue Hydro-Sediment Dynamics in Vegetated Rivers)
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20 pages, 4146 KiB  
Article
Effects of Patch Density and Incoming Sediment on Flow Characteristics and Bed Morphology
by Dan Wang, Feng Li and Kejun Yang
Water 2023, 15(18), 3247; https://doi.org/10.3390/w15183247 - 12 Sep 2023
Viewed by 1202
Abstract
This study focuses on the effects of vegetation patch density, bed condition, and incoming sediment on flow structure and bed morphology within and around a patch. The variation in upstream adjustment velocity is not well defined for low-density vegetation patches but decreases with [...] Read more.
This study focuses on the effects of vegetation patch density, bed condition, and incoming sediment on flow structure and bed morphology within and around a patch. The variation in upstream adjustment velocity is not well defined for low-density vegetation patches but decreases with increasing patch density in high-density patches. The length of the upstream adjustment region is greater for high-density vegetation. Incoming sediment causes a reduction in both the steady wake velocity and the length of the steady wake at a low density. The length of the recovery region increases with density when vegetation is sparse, but remains constant in a dense patch. Additionally, the length of the recovery region decreases due to incoming sediment. Turbulent kinetic energy is not affected by the bedform and incoming sediment when reaching its first peak. However, the second maximum of the turbulent kinetic energy increases when the bed is movable. The evolution of bed morphology is closely related to the flow structure and the growth of the von Karman vortex street. Both the rising length and the adjusted length decrease with increasing patch density, while the incoming sediment causes an increase in the adjusted length. Behind the patch wake, the first minimum elevation, maximum elevation, and second minimum elevation decrease as the patch density increases. These values, in turn, increase with the sediment supply upstream of the flume. Full article
(This article belongs to the Special Issue Hydro-Sediment Dynamics in Vegetated Rivers)
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