@article { author = {Daneshfaraz, Rasoul and Norouzi, Reza and Ebadzadeh, Parisa}, title = {Experimental and numerical study of sluice gate flow pattern with non- suppressed sill and its effect on discharge coefficient in free-flow conditions}, journal = {Journal of Hydraulic Structures}, volume = {8}, number = {1}, pages = {1-20}, year = {2022}, publisher = {Shahid Chamran University of Ahvaz}, issn = {2345-413X}, eissn = {2345-4156}, doi = {10.22055/jhs.2022.40089.1201}, abstract = {The purpose of this study is to investigate the flow pattern and discharge coefficient of sluice gate with the non-suppressed sill in experimental and numerical conditions. For this purpose, the sill of a rectangular cube in widths of 7.5, 10, 15, and 20 cm was installed under the sluice gate. Experimental results showed that placing a non-suppressed sill under the sluice gate by creating a failure in the flow lines causes a different flow pattern compared to the without sill state. Deviation of streamlines after colliding with the sill causes the formation of V-shaped currents. The discretization of equations for simulations were performed using VOF method. After selecting a cell with a size of 0.07 cm as the optimal cell, the RNG turbulence model was used. The results of the numerical simulation showed an acceptable agreement with the experimental results. Thus, the place of formation of V-shaped currents was transferred downstream of the sluice gate by increasing the width of the sill and the inflow discharge. The results of the study of the discharge coefficient showed that the placement of the sill with a width of 7.5 and 20 cm, increased the discharge coefficient by an average of 5.3% and 15.5% in the experimental model and 4.7% and 16% in the numerical simulation. This relationship is without sill state and with sill state with root mean square error of 0.967 and 0.968, respectively, estimated the discharge coefficient of the sluice gate.}, keywords = {Discharge,Flow velocity,StreamLines,Sluice Gate,Free Flow Condition}, url = {https://jhs.scu.ac.ir/article_17517.html}, eprint = {https://jhs.scu.ac.ir/article_17517_1d03c4b03f29225d57f8d7d0e750eb23.pdf} } @article { author = {Zare, Mohammad and Adib, Arash and S. Bajestan, Mahmood and Beigipoor, Gholam Hossein}, title = {Non-priority and priority allocation policies in water resources management concerning water resources scarcity using the WEAP model in the catchment area of Fars province}, journal = {Journal of Hydraulic Structures}, volume = {8}, number = {1}, pages = {21-34}, year = {2022}, publisher = {Shahid Chamran University of Ahvaz}, issn = {2345-413X}, eissn = {2345-4156}, doi = {10.22055/jhs.2022.40273.1206}, abstract = {Water shortage in dry regions include the region of this study urge the needs for management of water supply in different parts such as drinking and agriculture sectors, the effects and climate changes of the region should be evaluated in order to anticipate the necessary measures to deal with these effects. In the present study, based on the fifth IPCC reports, these changes were predicted using scenarios of RCP2.6,RCP4.5, RCP8.5.The results showed that by the end of this century, the annual temperature will increase by 4.7%, but in the case of precipitation, according to different scenarios,4.5RCPscenario considered as optimistic scenario and 2.6RCP as pessimistic and finally 8.5RCP considered as the median. Two general policies of allocation without prioritizing consumption and prioritizing urban consumption found to be ineffective regarding the allocation of water resources until the end of the present century. Many problems were observed in the drinking water sector in the policy without prioritization in the allocation of water resources in the months of June to October and in the allocation with prioritization of consumption in the months of August, September and October. Therefore, the rationing policy should beused to supply drinking water to the cities of Shiraz and Marvdasht. This policy showed the best efficiency by reducing the area under cultivation and changing the crop. Thus it is possible toavoid problems in both drinking water and agriculture by substituting rice product to wheat and reducing rice product to 50% as well as reducing the area under agricultural cultivation by58.4%.}, keywords = {Water resources management,consumption prioritization,WEAP model,climate change}, url = {https://jhs.scu.ac.ir/article_17576.html}, eprint = {https://jhs.scu.ac.ir/article_17576_331056d9ad2d1368d5a541a46cd864f9.pdf} } @article { author = {Ghaderi, Dana and Mollazadeh, Mahdi and Mahdizadeh, Hossein}, title = {Influence of T shape baffles arrangement on flow hydraulic characteristics in fishways}, journal = {Journal of Hydraulic Structures}, volume = {8}, number = {1}, pages = {35-51}, year = {2022}, publisher = {Shahid Chamran University of Ahvaz}, issn = {2345-413X}, eissn = {2345-4156}, doi = {10.22055/jhs.2022.40382.1209}, abstract = {Hydraulic structures constructed along the rivers cause disturbances in the natural process of aquatic life and the ecosystem of the region. In order to solve this problem, fishway structure is widely used to facilitate the communication path between downstream and upstream of hydraulic structures crossing the river and to eliminate the inability of fish to swim upstream and also to facilitate their movement downstream of dams. The different types of this structure should be designed to absorb the type of migratory fish in the area and to pass them safely and out of the outlet, without injuring the fish or creating unnecessary delays for the adult spawning fish. Therefore, in the present study, in order to determine the optimal configuration of the T shape baffles used in the path, three types of arrangements were numerically simulated using OpenFOAM software and K-ε turbulence model. These three types of arrangements are consecutive, alternate and also reversed. Then, the results of the numerical model were validated by comparing it with the results of the related laboratory model. The findings indicate that the numerical model is in good agreement with the laboratory results. Among the three configurations, taking into account different factors, the reverse location of T-shaped baffles with 68.3% backwater, 86.2% flow at less than 0.5 m/s, 84.1% turbulent kinetic energy values less than 0.02 square meters per square second and also 61% energy dissipation percentage, had the best performance.}, keywords = {Fishway structure,T shape baffle,OpenFOAM,Turbulent kinetic energy,Energy dissipation}, url = {https://jhs.scu.ac.ir/article_17577.html}, eprint = {https://jhs.scu.ac.ir/article_17577_daa926c3e8b119cebd6056ca76976893.pdf} } @article { author = {Mazaheri, Ahmadreza and Javadi, Akbar and Nasiri, Masoud}, title = {Liquefaction Behavior of Bushehr Coastal Carbonate Sand}, journal = {Journal of Hydraulic Structures}, volume = {8}, number = {1}, pages = {52-66}, year = {2022}, publisher = {Shahid Chamran University of Ahvaz}, issn = {2345-413X}, eissn = {2345-4156}, doi = {10.22055/jhs.2022.40316.1208}, abstract = {Over the past few years, liquefaction phenomena have always been one of the challenging issues in geotechnical engineering. The occurrence of liquefaction is due to cyclic tensions resulting from zero effective stress in the soil mass. Carbonate sands are significantly different in static and dynamic resistance than silicate sands. In this research, this phenomenon has been studied by studying the liquefaction behavior of Bushehr carbonate sand. In this paper, the liquefaction of Bushehr carbonate sand in multiple relative densities, different cyclic stress ratios (CSR), and different overburden stresses are studied and investigated. The liquefaction status of this sand is investigated in dry conditions and volume control situations in the simple shear apparatus. The results indicated that in the same conditions and a low cyclic stress ratio, by reducing overhead stress from 300 to 50 kPa, resistance to liquefaction in Bushehr carbonate sand will be 35 times more. This is not true in the higher cyclic stress ratio, in which liquefaction occurs in very low cycles (up to three cycles). The results also indicated that carbonate sand shows lower liquefaction resistance compared to silica sand.}, keywords = {Carbonate Sand,Liquefaction Phenomena,Simple Shear Apparatus}, url = {https://jhs.scu.ac.ir/article_17591.html}, eprint = {https://jhs.scu.ac.ir/article_17591_0f866f32425c33a8564d57ef895b3c07.pdf} } @article { author = {Rasaei, Mousa}, title = {Numerical Simulation of the effect of L-shaped spur dike wing length on scouring at a 90 ° bend.}, journal = {Journal of Hydraulic Structures}, volume = {8}, number = {1}, pages = {67-81}, year = {2022}, publisher = {Shahid Chamran University of Ahvaz}, issn = {2345-413X}, eissn = {2345-4156}, doi = {10.22055/jhs.2022.40476.1211}, abstract = {Spur dike is one of the common structures in organizing and controlling erosion on the river bank. On the other hand, the placement of the spur dike in the bended part of the river, while removing strong currents from the shore and directing the flow to the river axis, also changes the flow pattern and scour around the spur dike. The aim of this study was to numerically investigate the effect of length change in L-shaped Spur dike wing on scour depth located in a channel with a 90° bend. For this purpose, the three-dimensional SSIIM numerical model was used for simulation. L-shaped spur dikes with different wing lengths were tested and simulated. At the end, the outputs of the numerical model were compared with the laboratory results and validated. The results while confirming the SSIIM numerical model in scour simulation around the spur dike showed that by increasing the length of the spur dike wing and decreasing the angle of the spur dike in the bend, the depth and volume of the scour decreases significantly. In addition, the maximum depth and volume of scour around the spur dike was recorded at a 90 ° angle with a length to web ratio of 0.5. On the other hand, in all cases, scour around the simple spur dike was more than the L-shaped spur dike with different wing lengths.}, keywords = {L-shaped Spur-dike,wing length change,Scouring,SSIIM and numerical model}, url = {https://jhs.scu.ac.ir/article_17596.html}, eprint = {https://jhs.scu.ac.ir/article_17596_901c330bf723afbd29d8c15ca61486a0.pdf} } @article { author = {Sadripour, Mohammad and Vaghefi, Mohammad and Fioz, Ali Reza and Farahmandpour, Omolbanin}, title = {Effect of Scour Hole on Lateral Buckling of Offshore Snaked Lay Pipeline}, journal = {Journal of Hydraulic Structures}, volume = {8}, number = {1}, pages = {82-100}, year = {2022}, publisher = {Shahid Chamran University of Ahvaz}, issn = {2345-413X}, eissn = {2345-4156}, doi = {10.22055/jhs.2022.41074.1217}, abstract = {Submarine pipeline is one of the most popular research filed that many researchers focus on solving the issue of buckling of pipeline. The snaked laying is an effective method to control the lateral buckling. The scour below offshore pipeline may affect the efficiency and performance of the snake lay pipeline. The objective of this study was to investigate the effect of scour hole on the buckling of seawater pipelines. A three-dimensional numerical model developed to investigate the effect of scour below offshore pipeline subjected to wave and current by using Abaqus software and Aqua Module. The results indicated that vertical deformation of straight pipeline increased by increasing scour hole depth. This value changed 4.85 cm to 32.87 for holes 11 to 200 cm respectively, but these parameters of the snake lay pipelines were not affected by the presence of scour hole. Moreover, the effective axial force of snacked lay pipelines reduced 5 times in comparison to straight pipeline by applying wave and current. The results indicated that the value of stress of snaked-lay pipeline was independent on scour hole depth. Therefore, this pipeline was effective method to limit and control buckling even in the presence of scour below it}, keywords = {Submarine Pipeline,Snaked Lay Pipeline,Scour hole,Lateral Buckling}, url = {https://jhs.scu.ac.ir/article_17658.html}, eprint = {https://jhs.scu.ac.ir/article_17658_357ad1932e2118b136a061e04ef4fd13.pdf} }