0000000000286653

AUTHOR

Mahmood Shafai Bejestan

showing 3 related works from this author

Mean flow, secondary currents and bed shear stress at a 180-degree laboratory bend with and without enhanced permeable groins as an Eco-friendly rive…

2022

River restoration aims to apply environmentally-friendly structures for bank protection in meandering rivers to restore their natural habitat. Enhanced Permeable Groin (EPG) is a novel river restoration technique that can improve the fish habitat environment in a river system by creating a series of eco-friendly scour pools. This study reports the results of two groups of 3D velocity measurements in a 180-degree channel bend in cases with and without an EPG for clear water conditions to characterize the mechanisms leading to the primary stages of the scouring phenomenon. The analysis revealed that the presence of an EPG amplified the velocity magnitude in the regions near the tip of the van…

Enhanced permeable groinFish habitatEnvironmental EngineeringEnvironmental ChemistrySettore AGR/08 - Idraulica Agraria E Sistemazioni Idraulico-ForestaliRiver bendManagement Monitoring Policy and LawIn -stream structureSecondary currentWater Science and TechnologyCivil and Structural EngineeringRiver restoration
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Scour around a Permeable Groin Combined with a Triangular Vane in River Bends

2019

River restoration refers to the environmental and ecological aspect of river engineering and aims to improve the natural habitat of a river system using eco-friendly methods. This paper introduces a new river restoration technique for bank protection and restoration of meander bends by combining a permeable groin with a triangular vane. Nine different combinations of permeable groins with triangular vane including three different effective lengths and three angles of vane were investigated in a 180 degrees mild laboratory flume bend in clear water conditions. Based on experimental tests, scour geometrical patterns were analyzed, classified, and compared with each other. This analysis showed…

HydrologyRiver engineeringBANK EROSION010504 meteorology & atmospheric sciences0207 environmental engineering02 engineering and technologySEDIMENT01 natural sciencesAgricultural and Biological Sciences (miscellaneous)HabitatSettore AGR/08 - Idraulica Agraria E Sistemazioni Idraulico-ForestaliDOWNSTREAM020701 environmental engineeringFLOW PATTERNSGeology0105 earth and related environmental sciencesWater Science and TechnologyCivil and Structural EngineeringRESTORATION
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Investigating the Performance of Enhanced Permeable Groins in Series

2020

The enhanced permeable groin is a novel eco-friendly and cost-effective technique for bank protection and restoration of meander bends. The behavior of bed deformations due to the distance between the structures has to be studied to design enhanced permeable groins in series properly. In this study, scour morphologies around enhanced permeable groins in series, characterized by four different distances and located in a 180&deg

River restorationlcsh:Hydraulic engineeringGeography Planning and DevelopmentAquatic ScienceEffective lengthBiochemistryriver bendenhanced permeable groinThalwegsymbols.namesakelcsh:Water supply for domestic and industrial purposeslcsh:TC1-978Froude numberSettore AGR/08 - Idraulica Agraria E Sistemazioni Idraulico-ForestaliGeotechnical engineeringWater Science and Technologylcsh:TD201-500scourSeries (mathematics)Bank protection vegetation River bend River restoration ScourFlumebody regionssurgical procedures operativeMeandersymbolsParticlebank protectionriver restorationGeologyWater
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