Using In-Line Storage Strategy to Improve the Operation of Automatic Main Irrigation Canals (Case Study: Dez Main Irrigation Canal)
S.M.
Hashemy
author
M.J.
Monem
عضو هیئت علمی گروه سازه های آبی دانشگاه تربیت مدرس
author
S.
Isapoor
author
text
article
2012
per
Successful operation of a main irrigation canal system is achieved under the conditions thatdifferences between supply and demands are eliminated. In this research, the effect of In-Line storagestrategy on operation and management of an automatic main irrigation canal is assessed as anapproachable method for improving the main irrigation canal performance in rehabilitation andmodernization projects. A Proportional-Integral (PI) local upstream controller is designed for Dezmain irrigation canal to assess the capability of the proposed strategy. The controller was tested for anextreme and sudden increasing–decreasing water off-taking scenario on two different operationconditions. The first one refers to the normal operation and the latter refers to operation of the maincanal with in-line storage in the three canal reaches of the case under study. Controller performancewas evaluated with ASCE indices includes: MAE; IAE; and StE, for irrigation schedule time period(6 days). Results indicate that using in-line storage strategy leads operational performanceimprovement. The maximum MAE index improvement happens in the first canal reach withimproving values from 2.1 to 0.32. For the IAE and StE indices, maximum improvements areobtained from 1.3 to 0.5; and from 0.71 to 0.14 respectively. The satisfactory results is obtained forthe irrigation schedule with drastic changes, so using in-line reservoirs lead to the better results for thenormal irrigation schedule.
Journal of Hydraulics
Iranian Hydraulic Association
2345-4237
7
v.
3
no.
2012
1
14
https://jhyd.iha.ir/article_85345_fbda7b9f5807844d4730e4aebc4a064a.pdf
dx.doi.org/10.30482/jhyd.2012.85345
Investigation on the Effects of Slope on the Derivation of Artificial River Network using Different Routing Algorithms
A.
Shokoohi
دانشیار گروه مهندسی آب، دانشکده فنی و مهندسی، دانشگاه بینالمللی امام خمینی (ره)، قزوین
author
P.
Gholami
author
text
article
2012
per
Hydrologic modeling requires artificial derivation of river network. In this research, 5 famous routingalgorithms including D8, D=, RHO8, MFD and DEMON were employed. These algorithms routeflow on the basis of slope gradient. Therefore, the effects of slope on their performance wereinvestigated. The case study revealed that for overland slope greater than 5%, the differences betweenthe algorithms are not considerable, while all of which for slope less than 5% have problems becauseof generating parallel flow. The results show that if one could solve the problem of the RHO8 to returnthe same pattern of drainage network in every running, it could be recommended unconditionally.Meanwhile, the ability of the D8 and its relative reliability was confirmed, while the D= didn't showany superiority over other algorithms.
Journal of Hydraulics
Iranian Hydraulic Association
2345-4237
7
v.
3
no.
2012
15
32
https://jhyd.iha.ir/article_85346_74183f748b74f1e14b5b3d8a77997616.pdf
dx.doi.org/10.30482/jhyd.2012.85346
Investigation of the Effect of Roughness Wave Length on the Hydraulic Jump Characteristics of Roughened bed
M.
Bazzaz
author
B.
Ghorbani
Associate Professor of Water Engineering Department, Shahrekord University, Shahrekord, Iran
author
M.
Eskini
author
text
article
2012
per
In this study, variation of hydraulic jump characteristics including jump length and secondary depthand the variation of the effective length of roughness in relation to the wave length were studied. Forthis purpose, the characteristics of hydraulic jump under four different wave lengths and four differentFroude numbers were experimentally determined. Totally, 84 tests have been carried out in the rangeof Froude numbers from 5.84 to10.13 in a flume with length of 12 m , width of 40 cm, and height of40 cm. The results showed that the characteristics of hydraulic jump such as length of jump andsecondary depth declines as the length of roughness increases. It was also found that, the effectiveroughness length on the secondary depth increases as the wave length increases, but the effect ofroughness length on the length of jump is reverse. Regarding the derived relationships, the optimumdimensionless wave length was obtained to be 4.5.
Journal of Hydraulics
Iranian Hydraulic Association
2345-4237
7
v.
3
no.
2012
33
42
https://jhyd.iha.ir/article_85347_30a3648d7f0cbe1bae8ac4f957af3da8.pdf
dx.doi.org/10.30482/jhyd.2012.85347
Application of Near-wall Models Along with LES to Free Surface and Separated Flows
H.
Shamloo
دانشگاه خواجه نصیر
author
H.
Bozorgian
author
N.
Pishgoo
author
S.
Taghizadeh
author
text
article
2012
per
Application of Near-wall models along with large eddy simulation method for free-surface flow overbackward-facing step is investigated. Smagorinsky and Dynamic sub-grid scale models are used inLES code. Four different near-wall models have been developed based on advanced Werner-Wenglemodel. The simulation results are compared with experimental data of Nakagawa and Nezu (1987).The comparison shows a relatively good agreement for time-averaged velocities and also it showshigh accuracy in computation of reattachment point. Near-wall models have very close results inwhole domain except the reattachment region and this has been shown by comparison of viscose sublayerthickness that is an important parameter of these models. Although the dynamic sub-grid scalemodel is more complicated than standard model, both models have shown very close results in presentcase study.
Journal of Hydraulics
Iranian Hydraulic Association
2345-4237
7
v.
3
no.
2012
43
54
https://jhyd.iha.ir/article_85348_58bf56a6a9d5d8268c46345b465d15eb.pdf
dx.doi.org/10.30482/jhyd.2012.85348
Numerical Modeling of Flow around Cylindrical Piers Using Single and Dual Time-Stepping and Methods of RANS and LES
Y.
Aghaee-Shalmani
author
H.
Hakimzade
دانشگاه صنعتی سهند تبریز- بخش عمران
author
text
article
2012
per
In this study, details of a developed numerical model and results of modeling of the flow aroundcylindrical piers are presented. The governing equations are Navier-Stokes and continuity equations.Discretization of the equations is carried out by finite volume method. Modeling of turbulent flow isdone by two different methods namely RANS and LES. The method of solution of equations is theartificial compressibility method with two different single and dual time-stepping methods.Considering the adopted time-stepping method, the implicit or explicit time discretizations areadopted in simulations. Results of the present numerical modeling are compared with experimentaldata of flow around cylindrical piers. Results of this study show the influence of the method ofsolution, time-stepping method and turbulence modeling methods on the results of flow aroundcylindrical piers.
Journal of Hydraulics
Iranian Hydraulic Association
2345-4237
7
v.
3
no.
2012
55
71
https://jhyd.iha.ir/article_85349_f73455e69aad30d02e24deb193942050.pdf
dx.doi.org/10.30482/jhyd.2012.85349
Assessment of Regression Trees and Multivariate Adaptive Regression Splines for Prediction of Scour Depth Below the Ski-Jump Bucket Spillway
M.
Samadi
author
E.
Jabbar
دانشگاه علم و صنعت ایران دانشکده فنی
author
text
article
2012
per
Spillways are constructed in dams in order to discharge the excess water in the reservoir. In the skijumpbucket spillways, water jet impacts diagonally to downstream erodible bed and causes scourhole downstream of the dam. The scour hole development may threaten the stability of the dam.Hence, an accurate and correct estimation of scour depth is one of the most important issues inhydraulic engineering. In recent years, soft computing tools have been widely used to model complexand nonlinear phenomena. Therefore, in this study, using data mining algorithms such asclassification and regression trees and multivariate adaptive regression splines have been used forestimation of maximum scour depth at the downstream of the ski-jump bucket spillway. For thispurpose, these models were developed using 95 experimental data and dimensionless parameters. Theresults showed 3 q gH as the most important parameter in prediction of scour depth. In addition,statistical indicators and scatter diagrams showed that multivariate adaptive regression splines havethe highest value of correlation coefficient CC=0.966 and minimum error measures RMSE=0.075 andMAE=0.057 and were more accurate than regression trees in prediction of scour depth below a skijumpbucket spillway.
Journal of Hydraulics
Iranian Hydraulic Association
2345-4237
7
v.
3
no.
2012
73
79
https://jhyd.iha.ir/article_85350_d764f622c8ab517b24f924bd823f4d8e.pdf
dx.doi.org/10.30482/jhyd.2012.85350
English Abstract
text
article
2012
per
Journal of Hydraulics
Iranian Hydraulic Association
2345-4237
7
v.
3
no.
2012
83
88
https://jhyd.iha.ir/article_85351_3b91f759133cafc6c257a8b7410680bb.pdf
dx.doi.org/10.30482/jhyd.1391.85351