Duckbill weir is one of the water level control structures in irrigation networks, which is of in... more Duckbill weir is one of the water level control structures in irrigation networks, which is of interest to many engineers. Sediments transported in irrigation networks that accumulate upstream of duckbill weirs cause problems in operation, and affect the upstream water level. In this paper, submerged vanes and bottom slots are investigated for flushing the sediment downstream of the said weir. The experiments were conducted in a rectangular flume, 12 m long, and 0.6 m wide. The vanes placed in four sections were perpendicular to the sidewall. Flow-3D software was used for simulation of flow and sedimentation patterns. The results showed that submerged vanes create a secondary flow which is very useful for flushing the sediment, especially in the value of (H is head over the sidewall and P is the weir height). Further, the results showed duckbill weir efficiency (which is defined as the ratio of sediment trap to flow capacity of the weir) is as high as 47% (for values of H/P = 0.1–0....
To evaluate the effects of the current situation and future development on Source groundwater whe... more To evaluate the effects of the current situation and future development on Source groundwater whether quantitative or qualitative point of view, simulation computer resources, a powerful tool in the optimal utilization of source is considered. Year recent several model of math and computer simulation of hydraulic behavior of underground water resources focus is located. Like making mathematical phenomenon hydraulic set of algebraic relations, differential and integral that the groundwater flow hydrodynamics and its relations with aquifer levels to show. In this study, like making Narmab aquifer located in Golestan province, using a mathematical model Visual Mudflow 3.1 was performed. Changes of water level data from 15 wells piezometer water table in the study area, were evaluated. Results with coefficient estimates 97 percent representation for all to month showed that the water level model with acceptable accuracy similar building and to model groundwater flow in the aquifer above...
Scouring in a river is a phenomenon which is a result of interaction of flowing water and sedimen... more Scouring in a river is a phenomenon which is a result of interaction of flowing water and sediments that changes the topology of the river's bed. Understanding local scour depth around bridge piers is essential for both preventing the bridge from failure and ecological issues. Thus, it is necessary to provide appropriate methods to control the scour depth. Bed sill can be used as a countermeasure against local scour around the bridge piers. The effective parameters which can influence on habitat are velocity of flow, water depth and riverbed materials. Due to this fact that the water depth increases in the maximum scour depth region, it can effect on habitat. In this study, the scour depth around single pier, tandem piers, and effect of sill on scour depth around tandem piers are investigated experimentally. The results show that the scour depth downstream of piers is increased when sill structure is used in front of bridge pier. The results also show that the location of maximu...
International journal of Advanced Biological and Biomedical Research, 2013
To evaluate the effects of the current situation and future development on Source groundwater whe... more To evaluate the effects of the current situation and future development on Source groundwater whether quantitative or qualitative point of view, simulation computer resources, a powerful tool in the optimal utilization of source is considered. Year recent several model of math and computer simulation of hydraulic behavior of underground water resources focus is located. Like making mathematical phenomenon hydraulic set of algebraic relations, differential and integral that the groundwater flow hydrodynamics and its relations with aquifer levels to show. In this study, like making Narmab aquifer located in Golestan province, using a mathematical model Visual Mudflow 3.1 was performed. Changes of water level data from 15 wells piezometer water table in the study area, were evaluated. Results with coefficient estimates 97 percent representation for all to month showed that the water level model with acceptable accuracy similar building and to model groundwater flow in the aquifer above...
Journal of Agricultural Science and Technology, 2010
Cohesive sediment transport remains a complicated subject that hydraulic engineers are frequently... more Cohesive sediment transport remains a complicated subject that hydraulic engineers are frequently faced with in water-related engineering problems. This is primarily affected by the macroscopic aspects of water-sediment system characteristics. In this paper a 1-D mathematical model was developed to be employed in predicting the cohesive sediment transport under simultaneous conditions of erosion and deposition. This model is based on the convection-diffusion equation with proper source and sink terms and dispersion coefficient. The equation developed in the model has been solved by applying the finite volume approach. The model has been calibrated by employing the optimization technique using laboratory experimental data. For optimization, the transformed Powel's method has been employed. The data were collected in a flume of 10 m length, 0.30 m width and 0.45 m height. The applied discharges and concentrations were between 3 to 5lit/sec and 7 to 15 lit sec -1 , respectively. Th...
Duckbill weir is one of the water level control structures in irrigation networks, which is of in... more Duckbill weir is one of the water level control structures in irrigation networks, which is of interest to many engineers. Sediments transported in irrigation networks that accumulate upstream of duckbill weirs cause problems in operation, and affect the upstream water level. In this paper, submerged vanes and bottom slots are investigated for flushing the sediment downstream of the said weir. The experiments were conducted in a rectangular flume, 12 m long, and 0.6 m wide. The vanes placed in four sections were perpendicular to the sidewall. Flow-3D software was used for simulation of flow and sedimentation patterns. The results showed that submerged vanes create a secondary flow which is very useful for flushing the sediment, especially in the value of (H is head over the sidewall and P is the weir height). Further, the results showed duckbill weir efficiency (which is defined as the ratio of sediment trap to flow capacity of the weir) is as high as 47% (for values of H/P = 0.1–0....
To evaluate the effects of the current situation and future development on Source groundwater whe... more To evaluate the effects of the current situation and future development on Source groundwater whether quantitative or qualitative point of view, simulation computer resources, a powerful tool in the optimal utilization of source is considered. Year recent several model of math and computer simulation of hydraulic behavior of underground water resources focus is located. Like making mathematical phenomenon hydraulic set of algebraic relations, differential and integral that the groundwater flow hydrodynamics and its relations with aquifer levels to show. In this study, like making Narmab aquifer located in Golestan province, using a mathematical model Visual Mudflow 3.1 was performed. Changes of water level data from 15 wells piezometer water table in the study area, were evaluated. Results with coefficient estimates 97 percent representation for all to month showed that the water level model with acceptable accuracy similar building and to model groundwater flow in the aquifer above...
Scouring in a river is a phenomenon which is a result of interaction of flowing water and sedimen... more Scouring in a river is a phenomenon which is a result of interaction of flowing water and sediments that changes the topology of the river's bed. Understanding local scour depth around bridge piers is essential for both preventing the bridge from failure and ecological issues. Thus, it is necessary to provide appropriate methods to control the scour depth. Bed sill can be used as a countermeasure against local scour around the bridge piers. The effective parameters which can influence on habitat are velocity of flow, water depth and riverbed materials. Due to this fact that the water depth increases in the maximum scour depth region, it can effect on habitat. In this study, the scour depth around single pier, tandem piers, and effect of sill on scour depth around tandem piers are investigated experimentally. The results show that the scour depth downstream of piers is increased when sill structure is used in front of bridge pier. The results also show that the location of maximu...
International journal of Advanced Biological and Biomedical Research, 2013
To evaluate the effects of the current situation and future development on Source groundwater whe... more To evaluate the effects of the current situation and future development on Source groundwater whether quantitative or qualitative point of view, simulation computer resources, a powerful tool in the optimal utilization of source is considered. Year recent several model of math and computer simulation of hydraulic behavior of underground water resources focus is located. Like making mathematical phenomenon hydraulic set of algebraic relations, differential and integral that the groundwater flow hydrodynamics and its relations with aquifer levels to show. In this study, like making Narmab aquifer located in Golestan province, using a mathematical model Visual Mudflow 3.1 was performed. Changes of water level data from 15 wells piezometer water table in the study area, were evaluated. Results with coefficient estimates 97 percent representation for all to month showed that the water level model with acceptable accuracy similar building and to model groundwater flow in the aquifer above...
Journal of Agricultural Science and Technology, 2010
Cohesive sediment transport remains a complicated subject that hydraulic engineers are frequently... more Cohesive sediment transport remains a complicated subject that hydraulic engineers are frequently faced with in water-related engineering problems. This is primarily affected by the macroscopic aspects of water-sediment system characteristics. In this paper a 1-D mathematical model was developed to be employed in predicting the cohesive sediment transport under simultaneous conditions of erosion and deposition. This model is based on the convection-diffusion equation with proper source and sink terms and dispersion coefficient. The equation developed in the model has been solved by applying the finite volume approach. The model has been calibrated by employing the optimization technique using laboratory experimental data. For optimization, the transformed Powel's method has been employed. The data were collected in a flume of 10 m length, 0.30 m width and 0.45 m height. The applied discharges and concentrations were between 3 to 5lit/sec and 7 to 15 lit sec -1 , respectively. Th...
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Papers by Mehdi Halaghi