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Hydraulics of River Networks and Modelling

A special issue of Water (ISSN 2073-4441). This special issue belongs to the section "Water Resources Management, Policy and Governance".

Deadline for manuscript submissions: closed (31 January 2023) | Viewed by 5125

Special Issue Editors


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Guest Editor
Department of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, China
Interests: hydraulics; ecohydraulics; river dynamics; fluid mechanics; river management
College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, China
Interests: computational hydrodynamics; environmental hydraulics; turbulence modeling; internal waves and stratified flows; fluid mechanics; river network modeling

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Guest Editor
Institute of Water Science and Technology, Hohai University, Nanjing, China
Interests: rainfall runoff; mechanism and model development of pollutant transport; urban hydraulics; shallow water modeling; river network hydrodynamics

Special Issue Information

Dear Colleagues,

Recent advances in hydraulics of river networks either invasive or non-invasive, have greatly promoted and expanded our understanding of river network hydrodynamics, basin-scale runoff process and associated environmental/ecological problems. Among these, the striking advances include: (1) novel numerical simulation methods for large river networks, e.g. model efficiency improvement, multiscale coupling methods, machine learning methods, and coupling of hydrologic and hydraulic models; (2) hydrodynamics and mass transport in river networks and their effects on water environment and ecology;  (3) multi-objective scheduling of water project group and water security improvement for river networks, e.g. flood control, water resource management, water ecology protection; (4) hydrodynamics of surface water flooding and pollutant transport in urban environments.

This Special Issue continues to focus on, but is not limited to, the abovementioned topics, aiming to provide state-of-the-art developments within experiments, numerical simulations and field observations of river network hydraulics. This Special Issue will also serve as a platform for collecting and exchanging the latest academic research findings in river network hydraulics and river-related environment or ecology, along with novel measurement techniques, experimental and simulation methods. You are cordially invited to make a contribution to this Special Issue, rendering it successful and influential.

Prof. Dr. Saiyu Yuan
Dr. Hai Zhu
Dr. Taotao Zhang
Guest Editors

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Keywords

  • hydraulics
  • river networks
  • numerical simulation
  • ecohydraulics
  • urban hydraulics
  • rainfall runoff

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Published Papers (2 papers)

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Research

16 pages, 6539 KiB  
Article
Large Eddy Simulation of Compound Open Channel Flows with Floodplain Vegetation
by Cheng Zeng, Yimo Bai, Jie Zhou, Fei Qiu, Shaowei Ding, Yudie Hu and Lingling Wang
Water 2022, 14(23), 3951; https://doi.org/10.3390/w14233951 - 4 Dec 2022
Cited by 8 | Viewed by 2846
Abstract
Floodplain vegetation is of great importance in velocity distribution and turbulent coherent structure within compound open channel flows. As the large eddy simulation (LES) technique can provide detailed instantaneous flow dynamics and coherent turbulent structure predictions, it is of great importance to perform [...] Read more.
Floodplain vegetation is of great importance in velocity distribution and turbulent coherent structure within compound open channel flows. As the large eddy simulation (LES) technique can provide detailed instantaneous flow dynamics and coherent turbulent structure predictions, it is of great importance to perform LES simulations of compound open channel flows with floodplain vegetation. In the present study, a wall-modeled large eddy simulation (WMLES) method was employed to simulate the compound open channel flows with floodplain vegetation. The vegetation-induced resistance effect was modeled with the drag force method. The WMLES model, incorporating the drag force method, was verified against flume measurements and an analytical solution of vegetated open channel flows. Numerical simulations were conducted with a depth ratio of 0.5 and four different floodplain vegetation densities (frk = 0, 0.28 m−1, 1.13 m−1 and 2.26 m−1). The main flow velocity, secondary flow, bed shear stress and vortex coherent structure, based on the Q criterion, were obtained and analyzed. Based on the numerical results, the influences of floodplain vegetation density on the flow field and turbulent structure of compound open channel flows were summarized and discussed. Compared to the case without floodplain vegetation, the streamwise velocity in the main channel increased by 10.8%, 19.9% and 24.4% with the frk = 0.28 m−1, 1.13 m−1 and 2.26 m−1, respectively. The results also indicated that, when the floodplain vegetation density increased, the following occurred: the velocity increased in the main channel, while the velocity decreased in the floodplain; the transverse momentum exchange was enhanced; and the strip structures were more concentrated near the junction area of compound open channel flows. Full article
(This article belongs to the Special Issue Hydraulics of River Networks and Modelling)
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12 pages, 1916 KiB  
Article
Comparative Study on Water Temperature Stratified Flow under Different Vertical Coordinate Systems in Delft3D
by Yun Lang, Zijun Hu, Ruixia Hao, Yafei Li and Lijuan Han
Water 2022, 14(17), 2737; https://doi.org/10.3390/w14172737 - 2 Sep 2022
Viewed by 1750
Abstract
Reservoirs often suffer from water blooms, which are likely related to the hydrodynamic and water temperature characteristics of the tributary bays. To obtain the detailed changing process of hydrodynamics and water temperature stratification, it is necessary to choose a suitable vertical coordinate system [...] Read more.
Reservoirs often suffer from water blooms, which are likely related to the hydrodynamic and water temperature characteristics of the tributary bays. To obtain the detailed changing process of hydrodynamics and water temperature stratification, it is necessary to choose a suitable vertical coordinate system in order to achieve the required precision. Based on a physical model experiment of cold water flowing into the Generalized Reservoir Hydraulics (GRH) flume, both the σ-coordinate system model and the z-coordinate system model are built for comparison. For the z-coordinate system model, the influences of different grid resolutions and different bottom slopes on the simulation accuracy are also analyzed. The results show that the σ-coordinate system model can simulate cold-water underflow in a reservoir better than the z-coordinate system model, and the numerical errors of the z-coordinate system model can be reduced but not eliminated by increasing the horizontal grid resolution. When the bottom slope of the reservoir is less than 18‰, the z-coordinate system model can also be used to simulate cold-water underflow in a reservoir. The conclusions about vertical coordinate systems can be applied to the development of a three-dimensional hydrodynamic and water temperature model of reservoirs. Full article
(This article belongs to the Special Issue Hydraulics of River Networks and Modelling)
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