shabnam vakili; mahmoud erhami; hossein baghdadi
Abstract
The main purpose of this research is to identify the behavior of rivers in the area of Lashtghan shrimp breeding site and to provide technical solutions to organize and prevent flood risks in it. In order to determine the flood zone for the return period of 25 years, the water height was transferred ...
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The main purpose of this research is to identify the behavior of rivers in the area of Lashtghan shrimp breeding site and to provide technical solutions to organize and prevent flood risks in it. In order to determine the flood zone for the return period of 25 years, the water height was transferred to the ArcGIS. Finally, in order to present the proposed natural bed line, according to the flood zone with a return period of 25 years and satellite images at different time intervals, the proposed bed line was extracted after checking the flood zone with the satellite image. According to the purpose of the project, domain of usage and technical and economic conditions, the earthen dike option was introduced as the selected option for the land protection plan against floods. Then, in Civil 3D software, the protective dike project line was defined, and then according to the 100-year flood water level, the protective dike was designed. The output of the model included the characteristics of the maximum flow level, depth of flow and maximum flow velocity in the study area, according to which it was observed that the built dike has no effect on the surrounding residential areas, the earthen dike in some places due to the topography. The entity acts like a reservoir and the flow does not transfer downstream and is stored behind the dike, which has a volume of about 3 million cubic meters for a flood with a return period of 100 years, which can be done by constructing a borrow pit in the vicinity of the dike transferred a significant part of the water downstream. Finally, the height of the dike, the slope of the body and the width of its crown were calculated and its cost was estimated at 72,925,000,000 million Rials.
