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Turbulent structure in uniform inclined open channel flow over different rough porous beds

International Journal of Sediment Research 2017年第1期32卷 45-52页

作者： evangelos keramaris University of Thessaly Department of Civil EngineeringDivision of Hydraulic and Environmental Engineering

In this study the effects of the different rough porous beds in an open inclined channel are studied experimentally for impermeable and permeable porous *** the simulation of porous bed two different types of permeable bed with the same thickness(s’ = 3 cm) and the same porosity ε=0.70 are used:(a) porous filters and(b) gravel *** experiments were used for the calculation of turbulent velocity *** of velocity were taken for inclined channel for three different slopes(S=-0.002,S=-0.004 and S=-0.006) and for five different flow depths(h=5 cm,7 cm,9 cm,11 cm and 13 cm).The total discharge Q varies from 0.78 to 1.31 1/*** measurements were obtained using a two-dimensional(2D) Particle Image Velocimetry(PIV).The total discharge was estimated using a calibrated venture *** showed that the presence of rough porous bed in inclined open channels influence significantly the turbulent characteristics of the flow in comparison with impermeable open channels with the same slopes.

关键词： Particle image velocimetry Porous filters Gravel bed Channel slope Turbulent characteristics

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Study of water renewal and sedimentation of a square harbor encapsulated in a coastal front with seawalls due to wind-induced hydrodynamic circulation

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International Journal of Sediment Research 2021年第3期36卷 373-383页

作者： Yiannis Savvidis evangelos keramaris InternationalHellenicUniversity DepartmentofEnvironmentalEngineering UniversityofThessaly DepartmentofCivilEngineering

In the current study in the middle of a coastal zone, a harbor basin in the form of a square area recessed to the front is considered. A breakwater of variable length and position offers protection from waves. The water renewal time and the self-purification capacity of the harbor under the influence of alongshore currents due to wind-induced water circulation of varying intensities were examined. Furthermore, the transport of particulate matter released from the upstream side of the coastal zone and the possible influence(via sedimentation) on the lateral basin was investigated. The current study was based on the use of a two-dimensional depth-averaged hydrodynamic model and a quasi-three-, dimensional transport model while the effect of partial closing of the harbor’s entrance was examined. The(1) adjustment and(2) validation of the reliability of the numerical model at a laboratory level were done using a recent research based on the use of a particle image velocimetry(PIV) measurements ensuring very good agreement between numerical and experimental results. The current study showed that the partial closing of the opening between the harbor basin and the extended coastal zone, with a breakwater of length equal to 1/3 of the opening, seems to be the most acceptable technical solution.

关键词： Coastal zone Numerical model PIV measurements Renewal time Self-purification capacity Matter transport

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