جستجو در تالارهای گفتگو

The Impact of Niatak Lateral Spillway Performance on Process of Erosion and Sedimentation of Sistan River of Iran Original Article, D81 Motallebian M, Hassanpour F. J. Civil Eng. Urban. 4(5): 540-545. 2014 ABSTRACT: Sistan River Being located on the tail water of Helmand’s very extensive basin, it is prone to deposition of fine sediments, particularly in times of flood. The diversion structures on this river are Zahak and Sistan Dams. In this research the HEC-RAS model which has the ability to calculate the hydraulic parameters, is used to study of Niatakk spillway located in the upstream of Zahak dam. In this regard after the calibration model, the Erosion and Sedimentation process of the river during various conditions of utilization of the Zahak and Sistan dams was studied. The results show due to backwater by Zahak dam and giving the opportunity to the settling of suspended sediments, the rate of sedimentation between Niatak spillway and Zahak dam in situation of full utilization of Niatak spillway has become twice greater than situation which the gates are completely open. In situation of full utilization from Niatak spillway, the accumulated sediment in the interval between the Niatak spillway and Zahak dam is about 45% of the whole accumulated sediment and the accumulated sediments weight in this interval is about 20% of the whole accumulated sediment in situation which the gates are completely open. Keywords: Sistan River, Niatak Spillway, Erosion, Sedimentation, HEC-RAS model منبع: [Hidden Content] دانلود: [Hidden Content].,%204%20(5)%20540-545,%202014.pdf J. Civil Eng. Urban., 4 (5) 540-545, 2014.pdf

The Study of Effect of Dredging and Dike Construction on the Flow Hydraulic and Reduction of Flood in Downstream of the River (Case Study: Karun River Downstream Between Ahvaz and Farsyat) Original Article, C27 Monjezi R, Heidarnejad M, Asadi Lor M, Hoseini E. Journal. Civil Eng. Urban. 3(4):170-175. 2013 ABSTRACT:The aim of this study is to simulate a numerical model for flood spreading and to control it in Karoun River in the downstream of Ahvaz to Farsyat which is affected by dredging and the construction of dike. Using the HEC-RAS 4.1 software, one-dimensional flow model in this field was simulated. After entering the data to the model and calibration, the model was run based on selected design flow rates, and water levels were calculated and areas of flood spreading were defined. Then, the mathematical model was run based on the dredging and dike construction. Due to lack of efficiency of dredging operations for flood control and the lack of a suitable location for deflecting flow, the only practical and cost-effective method for controlling the flood of the Karoun River in the studied interval is to construct a dike with designed height. Keywords: Karoun River, Flood, HEC-RAS Model, Dike, Dredging منبع: [Hidden Content] دانلود: [Hidden Content].,27-170-175.pdf J. Civil Eng. Urban.,27-170-175.pdf