جستجوی مقالات مرتبط با کلیدواژه "شبیه سازی هیدرولیکی" در نشریات گروه "محیط زیست"

Urbanization and land use changes in urban environments have led to the development of impermeable lands in urban areas. the risk of floods in urban basins compared to non-urban basins has increased and has caused a lot of damage to urban infrastructure, it is necessary to use approaches that, preventing the detrimental effects on the urban environment, provide maximum efficiency in runoff management projects at the source. , in the present study, the combination of structural and non-structural methods of flood management and technical-economic comparison of these methods have been Studied. Bentley StormCAD software has been used as a hydraulic model for structural design and modern LID-BMP approaches have been used as non-structural methods for surface runoff management in Islamic Azad University of Najafabad. Modern approaches have included soakaway, infiltration trench, rain gardens, temporary dry detention basin and vegetated swale. The analysis of results and technical-economic evaluation is based on structural, non-structural scenarios and integrated approach. The results of hydraulic analysis have shown that the average flow rate in the network is 370 lit/s and the minimum flow rate is equal to 10 lit /s, which justifies the possibility of using non-structural methods. Comparison of methods has shown that the use of an integrated approach to a structural approach has reduced costs by 48% and runoff by 90% over a 2 to 10 year return period. During the 50- and 100-year return periods, it also reduced surface runoff at the outlet points of the basin by 74% and 59%, respectively.

Rivers are the main arteries of human life, thus control and proper exploitation of these surface resources require a proper understanding of their behavior and investment in the river improvement. By reviewing and evaluating the projects carried out in this area, their positive and negative aspects can be checked and the obtained results can be used to overcome the projects shortcomings, improve their efficiency and make the future projects more fruitful. Sistan River is the major border river between Iran and Afghanistan and Sistan life depends on it. The length of this river in Iran is about 70 Km. This study attempts to evaluate the performance of Sistan and Zahak diversion dam structures and the structures alongside the river using HEC-RAS hydraulic model. The results show that these structures increase the maximum Sistan flood power transmission in the absence of these structures from 500 m3/s to 810 m3/s. Considering the importance of estimating Manning roughness coefficient with high precision for hydraulic calculation in the river engineering projects, the main river bed roughness coefficient for the main river and the flood plains of Sistan were estimated as 0.02 and 0.035, respectively. It was also found that Discharge-Return period relation can be expressed as. Existence of diversion dam structures on the unpredictable rivers such as Sistan River may double the flood power transmission in some cases. In this study, the effect of 310 m3 per power transmission increse through Sistan River was observed. The reasons for the relatively low impact (the xpectation was more) are slight slope of Sistan plain, and water expansion on flood plain and back water in the direction of Sistan River flow.