Special Issue "Research on Hydraulics and River Dynamics"

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

Deadline for manuscript submissions: 31 August 2021.

Special Issue Editor

Emer. Prof. Vlassios Hrissanthou
Website
Guest Editor
Democritus University of Thrace, Department of Civil Engineering, Xanthi, Greece
Interests: hydrology; hydraulics; hydraulic structures
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Special Issue Information

Dear Colleagues,

River engineering is one of the most important subjects in hydraulic engineering. The main scientific fields that are necessary for understanding the basic principles of river engineering include hydrology, hydraulics, and geomorphology. By means of the hydrologic rainfall–runoff models, the river inflows originating from rainfall-induced overland flow can be calculated. In the case of intense storms, the extreme situation of flood routing in rivers should be faced. Flood routing can be calculated by means of both hydrologic and hydraulic models. Hydraulic models are based on the water mass and momentum conservation equations, which are partial differential equations of hyperbolic type and are solved by means of numeric methods (e.g., finite difference schemes). Soil erosion products from the surrounding basins are transported by the overland flow into the rivers, and constitute the so-called wash load that is transported in the rivers in suspension. The river bed can be eroded by the river flow, or suspended sediment can be deposited on the river bed. So, the geomorphology of the river bed is strongly affected by the phenomenon of sediment transport. Numerous computational models for bed load and total load have been developed in the past. In order to account for the sediment transport in rivers, the sediment continuity equation should be added to water mass and momentum conservation equations. Sediment transport is mainly influenced by unsteady turbulent flows, which constitute the normal physical condition in rivers. Vegetation on river banks is also a physical element influencing the river flow. Especially in reservoirs and lakes, the hydraulic and geomorphologic conditions are different from those dominating in rivers. Generally, the hydraulic structures (e.g., dams) modify the hydraulic and geomorphologic regimes in rivers.

Emer. Prof. Vlassios Hrissanthou
Guest Editor

Manuscript Submission Information

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2000 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

  • River hydraulics
  • Engineering hydrology
  • River bed geomorphology
  • Unsteady turbulent flow
  • River bank vegetation
  • Sediment transport
  • Bed and bank erosion
  • River bed deposition
  • Hydraulic structures

Published Papers (3 papers)

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Research

Open AccessArticle
Experimental Study on the Influence of the Transition Section in the Middle of a Continuous Bend on the Correlation of Flow Movement in the Front and Back Bends
Water 2020, 12(11), 3213; https://doi.org/10.3390/w12113213 - 17 Nov 2020
Viewed by 331
Abstract
There exists a correlation in the flow movement between the front and back bends of a continuous bend, and the change in the transition section configuration influences this correlation. In this paper, laboratory experiments were conducted to systematically measure the three-dimensional velocity in [...] Read more.
There exists a correlation in the flow movement between the front and back bends of a continuous bend, and the change in the transition section configuration influences this correlation. In this paper, laboratory experiments were conducted to systematically measure the three-dimensional velocity in a continuous bend with different width/depth ratios of the transition section. Based on this work, the flow movement characteristics of a continuous bend were analysed, including the circulation structure, circulation intensity and Turbulent Kinetic Energy (TKE). The flow movement correlation between the front and back bends of the continuous bend was also analysed. The influence of the width/depth ratio of the transition section on the correlation of the flow movement of the front and back bends and their relationship with discharge were explored. This research could help to elucidate the development and evolution laws of the continuous bend and provide theoretical support for flow movement, flood routing, sediment transport and riverbed evolution. It is found that in addition to the circulation structure and intensity, the TKE of the front and back bends of the continuous bend also shows a strong correlation. With increasing discharge, the correlation between the front and back bends increases, and the larger the discharge is, the greater the influence of the same amplitude of variation in the discharge on the correlation. At the same time, the larger the discharge is, the greater the influence of the same amplitude of variation in the width/depth ratio of the transition section on the correlation of the front and back bends. When the discharge is constant, the correlation between the front and back bends decreases with the decrease in the width/depth ratio of the transition section, and the smaller the width/depth ratio, the greater the influence of the same amplitude of variation in the width/depth ratio on the correlation. There is no linear relationship between the amplitudes of variation in both the discharge and width/depth ratio and the corresponding amplitude of variation in the correlation. With increasing discharge, the amplitude of variation in the correlation caused by the same amplitude of the variation in discharge slightly increases. However, there is an exponential relationship between the amplitude of variation in the width/depth ratio and the corresponding correlation. The influence of the width/depth ratio on the correlation is clearly greater than that of the discharge. Full article
(This article belongs to the Special Issue Research on Hydraulics and River Dynamics)
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Open AccessArticle
Comparison of Methods for Bed Shear Stress Estimation in Complex Flow Field of Bend
Water 2020, 12(10), 2753; https://doi.org/10.3390/w12102753 - 02 Oct 2020
Viewed by 414
Abstract
Bed shear stress is closely related to sediment transport in rivers. Bed shear stress estimation is very difficult, especially for complex flow fields. In this study, complex flow field measurement experiments in a 60° bend with a groyne were performed. The feasibility and [...] Read more.
Bed shear stress is closely related to sediment transport in rivers. Bed shear stress estimation is very difficult, especially for complex flow fields. In this study, complex flow field measurement experiments in a 60° bend with a groyne were performed. The feasibility and reliability of bed shear stress estimations using the log-law method in a complex flow field were analyzed and compared with those associated with the Reynolds, Turbulent Kinetic Energy (TKE), and TKE-w′ methods. The results show that the TKE, Reynolds, and log-law methods produced similar bed shear stress estimates, while the TKE-w′ method produced larger estimates than the other methods. The TKE-w′ method was found to be more suitable for bed shear stress estimation than the TKE method, but the value of its constant C2 needed to be re-estimated. In a complex, strong, three-dimensional flow field, the height of the measurement point (relative or absolute) should be re-estimated when a single point measurement is used to estimate the bed shear stress. The results of this study provide guidance for experimental measurement of bed shear stress in a complex flow field. Full article
(This article belongs to the Special Issue Research on Hydraulics and River Dynamics)
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Open AccessArticle
Optimal Strategy to Tackle a 2D Numerical Analysis of Non-Uniform Flow over Artificial Dune Regions: A Comparison with Bibliography Experimental Results
Water 2020, 12(9), 2331; https://doi.org/10.3390/w12092331 - 19 Aug 2020
Viewed by 566
Abstract
Flow simulation over a dune requires the proper input of roughness coefficients. This study analyzed a numerical simulation of open-channel turbulent flow over two-dimensional fixed dunes to reveal the effect of roughness on the dune bottom, and to determine the optimized combination of [...] Read more.
Flow simulation over a dune requires the proper input of roughness coefficients. This study analyzed a numerical simulation of open-channel turbulent flow over two-dimensional fixed dunes to reveal the effect of roughness on the dune bottom, and to determine the optimized combination of the turbulence scheme and the roughness height formula. The most appropriate roughness values and turbulence models were applied using Reynolds-averaged Navier–Stokes models. Seven methods were chosen to estimate the bed roughness properties at the inlet boundary section. The results of all cases calculated with the OpenFOAM toolbox were compared with laboratory experimental data for model validation. The performances of all bed roughness variations were evaluated according to the stream-wise and depth-wise directions with nondimensional values. Consequently, it was revealed that the combination of bottom roughness length scale at the inlet boundary and the k-ω shear-stress transport (SST) model was the most suitable for the flow separation zone and turbulent properties near the channel bottom. Full article
(This article belongs to the Special Issue Research on Hydraulics and River Dynamics)
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