انجمن هیدرولیک ایران نشریه علمی هیدرولیک 2345-4237 6 3 2011 11 22 Assessment and Comparison oF Fuzzy Automatic Control System using Two Rule Base Applied oN Pivot Weirs ارزیابی و مقایسه کارکرد سامانه کنترل خودکار فازی با دو نوع پایگاه قواعد برای سرریز لولایی 1 12 85484 10.30482/jhyd.2011.85484 FA رضا نورسته محمد جواد منعم عضو هیئت علمی گروه سازه های آبی دانشگاه تربیت مدرس 0000-0001-7735-9976 Journal Article 2011 03 23 Using effective methods to provide optimal performance of irrigation networks is inevitable because of limited water resources and poor performance of irrigation networks. Different algorithms are used for automatic control of water level in irrigation canals with their own limitations. Fuzzy logic is capable of resolving some of these limitations. Although fuzzy logic is successfully used in many engineering applications, it has not been used for water level control in irrigation canals. In this study fuzzy algorithm with two rule base is used for automatic water level control on pivot weir. Automatic control system was constructed on laboratory scale, and its performance for the situation of high flow variation was evaluated. One of the main components of the fuzzy controller is rule-base decision making. In the experiments conducted in this study two types of rule-base decision making are applied and the results are compared. The results show that in high flow variations (400%), maximum absolute error (MAE) and cumulative absolute error (IAE) indices values are in the range of 6.9 to 9.2 and 0.79 to 1.17percentages respectively and variations are stabilized within less than 2 minutes. Using the second type of rule-base, system, stability is improved and water level variations and number of structure adjustment is decreased. The fuzzy automatic control system is suitable in controlling water levels and its application for irrigation canal control is recommended. https://jhyd.iha.ir/article_85484_0094eb7d9dc080e6fe137bbc8bbbbc74.pdf

انجمن هیدرولیک ایران نشریه علمی هیدرولیک 2345-4237 6 3 2011 11 22 Assessment of Velocity Profile Variation of Hydraulic Jump in Relation to Changes in the length of Roughness بررسی تغییر پروفیل های سرعت نسبت به تغییر طول زبری در پرش هیدرولیکی 13 24 85485 10.30482/jhyd.2011.85485 FA محمد بزاز بهزاد قربانی حسین صمدی بروجنی Journal Article 2011 03 23 In this study, the variation of velocity profile at different sections of hydraulic jump were evaluated in relation to changes in the length of roughness on a rough bed performing the tests in a flume with length of 12m, width and the height of 0.40m. Nine profile variation tests were carried out for 3 Froude numbers and 3 lengths of roughness. In each test, four sections of hydraulic jump were selected in which the velocity was measured at 1 cm intervals. The impact of changes of roughness length on velocity profile was surveyed at short, medium and long reaches of effective length. The results indicated that although the dimensionless velocity profiles on the rough bed are similar, their shapes are different from that of on a smooth bed. The boundary layer was another subject studied in this research. The results showed that the boundary layer thickness increased with an increase in the length of roughness and finally dimensionless boundary layer thickness reaches the values of 0.26 for short and 0.37 for medium and long roughness lengths. https://jhyd.iha.ir/article_85485_f874d58af1fb1ddb0f3283870eaac0fd.pdf

انجمن هیدرولیک ایران نشریه علمی هیدرولیک 2345-4237 6 3 2011 11 22 Motion Analysis of Particles and Estimation of Trap Efficiency in the Settling Basin Using Euler-Lagrangian Model تحلیل حرکت ذرات رسوب و برآورد کارایی تله اندازی در حوضچه ترسیب با استفاده از مدل اویلری - لاگرانژی 25 37 85486 10.30482/jhyd.2011.85486 FA حسین غفاریان روح پرور محمود فغفور مغربی استاد گروه مهندسی عمران - دانشکده مهندسی دانشگاه فردوسی مشهد 0000-0002-0082-0020 علی نصیریان Journal Article 2011 03 23 Several studies using Computational Fluid Dynamics (CFD) techniques for modeling the process of sedimentation in settling tanks have been carried out to predict the fluid flow patterns and particle deposition during advection and dispersion process in tanks. To simulate the movement of the sediments in the settling tank, a Lagrangian approach is implemented. For this purpose, the finite volume method is used. After modeling sediment flow pattern, analysis of particles move ment and trap efficiency in sediment tank are presented. https://jhyd.iha.ir/article_85486_097d3dd76d6fe65367ec05274e7ac9ab.pdf

انجمن هیدرولیک ایران نشریه علمی هیدرولیک 2345-4237 6 3 2011 11 22 Risk Analysis for Dam Overtopping Considering Hydraulic and Hydrologic Parameters (Vanak Dam as a Case Study) تحلیل خطر روگذری آب در سد با در نظر گرفتن جنبه های هیدرولیکی و هیدرولوژیکی (مطالعه موردی: سد ونک) 39 53 85487 10.30482/jhyd.2011.85487 FA عبدالرضا کبیری سامانی دانشیار، دانشکده مهندسی عمران، دانشگاه صنعتی اصفهان 0000-0002-5984-3892 نیکو منصوری امیررضا سدهی سامانی Journal Article 2011 03 23 In this study, a probability- based methodology is formulated to evaluate quantitatively and systematically the overtopping risk of earth dams. This study considers the overtopping phenomena induced by the occurrence of flood and wind effects. The risk analysis based models for overtopping consist of random modeling of the flood generation, wind dynamic aspects, reservoir routing, reservoir geometry, inflow discharge, outflow discharge, dam height, initial water surface and correction factor for increasing water induced by wind. For calibrating the results of simulation and modeling, Vanak dam in Charmahal Bakhtiari is used as a case study. The case study was employed to demonstrate how the total risk of overtopping over a practical case could be estimated based on the proposed methodology. Annual maximum series of peak flow discharge and wind velocity of Vanak dam are used to analyze extreme flood and wind with different frequencies by using hydrological frequency analysis software (HYFA). Risk analysis results show that considering uncertainties of random parameters affects significantly the dam reliability. Also overtopping risk of Vanak dam is not sensitive to increasing initial water surface. By increasing uncertainty of inflow flood, overtopping risk is increased.Risk overtopping increases, while the uncertainty of reservoir geometry increased. Also dam reliability is decreased by malfunction of spillway’s gates. Based on this analysis both the effect of wind and flood together influence the overtopping risk of earth dam. https://jhyd.iha.ir/article_85487_a7a1267e0f71026635cf504276e6df81.pdf

انجمن هیدرولیک ایران نشریه علمی هیدرولیک 2345-4237 6 3 2011 11 22 Development of Unsteady State Bed Variations Simulation Model in Gravel Bed Rivers توسعه مدل شبیه سازی تغییرات بستر رودخانه های شنی تحت جریان ناپایدار با رسوب ورودی از بالادست 55 72 85488 10.30482/jhyd.2011.85488 FA مهدی باقری نژاد محمدرضا مجدزاده طباطبایی عضو هیات علمی/ پردیس فنی مهندسی شهید عباسپور- دانشگاه شهید بهشتی 0000-0002-6205-7868 سید سعید موسوی ندوشنی Journal Article 2011 03 23 Obtaining an analytical solution for bed variation equations, is a hard task and often impossible. However, if a quasi–steady state is considered for flow condition, analytical solution may not be unreachable provided that necessary simplifications are made. The main purpose of this paper is to develop an analytical model to predict bed variations in flood conditions with upstream sediment supply. In this study, non–uniformity of bed material size has been considered by hiding function. In addition, governing equations have also been applied and solved to compute values for unknown parameters such as hydraulic parameters, bed material size, water surface slope and elevation and bed load at various times from the beginning of flooding. Model validation with observed experimental data have been made and followed by sensitivity analysis. Finally the effect of flood hydrograph shapes has also been investigated on bed variations in gravel bed rivers. Results have shown that hiding function has modeled non–uniformity of the bed materials appropriately while a reasonable agreement has been found with observed experimental data for flow Froude number of less than 0.8. https://jhyd.iha.ir/article_85488_56774c607fa6ae69d2864307508dbce2.pdf

انجمن هیدرولیک ایران نشریه علمی هیدرولیک 2345-4237 6 3 2011 11 22 Numerical Investigation on the Hydraulics of River Lateral Intakes by SSIIM2 Software بررسی عددی هیدرولیک آبگیرهای جانبی رودخانه ای با استفاده از مدل عددی SSIIM2 73 81 85489 10.30482/jhyd.2011.85489 FA حمید شاملو دانشگاه خواجه نصیر عادل اثنی عشری Journal Article 2011 03 23 In areas with sediment laden floodwater, sediments are carried into the intakes and decrease the channel conveyance capacity. These sediments are settled at different locations, including the separation zone at the upstream section of the lateral channel. Therefore, it is important to determine the length and width of separation zone. In this study, hydraulics of the flow in an intake from a rectangular channel using SSIIM2 is investigated. The ratio of intake width to main channel width, diversion angle, Froude number and ratio of diverted discharge on separation zone dimensions are among the effective parameters in the hydraulics of intakes. These parameters were investigated and numerical results were compared with those of experimental ones. There was a good agreement between the numerical and experimental results. For estimation of the above parameters several equations were developed. k-3 turbulence model was also found to be suitable for intakes hydraulics. https://jhyd.iha.ir/article_85489_5feee1d34cec9c997857ddfb0e483115.pdf

انجمن هیدرولیک ایران نشریه علمی هیدرولیک 2345-4237 6 3 2011 11 22 Effects of Inflow reduction on Water Level, Morphology and Salinity Pattern of the Urmia Lake تاثیر کاهش حجم آب ورودی بر تراز آب، ریخت شناسی و رژیم شوری دریاچه ارومیه 83 93 85490 10.30482/jhyd.2011.85490 FA آرش بختیاری مصطفی زین الدینی دانشگاه خواجه نصیرالدین طوسی- گروه عمران محمدعلی توفیقی Journal Article 2011 03 23 Urmia lake is one of the largest and most saline Lakes of Iran. This lake plays a key role in an environment of the northwest of Iran. In the last decade, construction of several dams on the rivers discharging to the lake has caused water level decrease of the lake and as a result adverse effects on the lake environment. In this research, by using Mike 3D model, water level and salinity pattern of the Urmia lake have been predicted. Inflow decrease to the lake was considered to be both gradual and instantaneous. Salinity and water level of the lake during coming years were also simulated. According to the results obtained, reduction of inflow to the lake has caused decrease of water level in the lake. This decrease will cause atrophy of major part of the lake. Water level reduction of the lake varied from 1.5 to 2.5 meter depending on the amount of inflow diverted and used upstream. Furthermore, several scenarios have been investigated to improve the lake condition. These results have also shown that creating an extra opening in the west of causeway, does not have any significant effects on the salinity pattern of the lake. https://jhyd.iha.ir/article_85490_65a38dece85e0afa021fa7fac55eaa3d.pdf