Influence of the Gate and Weir Interaction on Discharge Characteristics of the Weir - Gate Combined Flow Structure

Document Type : Research Paper

Authors

1 Urmia university Water engineering departement

2 2- Prof., Dept. of Water Structures, Faculty of Water science Engin., Univ. of Shahid Chamran Ahwaz, Ahwaz, Iran

3 Prof., Dept. of Civil Engin., Univ. of Azad Eslami, Tehran, Iran

Abstract

Theoretical equations were resulted for calculating the combined discharge and discharge coefficient on weir- gate combined flow structure under free flow condition, by applying the energy equation between two points along the passing streamline from lip of the gate. One of the points was considered at the upstream of the weir-gate combined flow structure and the other one at the vena contracta. The gate relative discharge (the ratio of the gate discharge to the weir- gate combined flow structure discharge) was considered as an interaction factor. Influence of the gate relative discharge on combined discharge coefficient and stagnation point level at upstream of the structure was characterized using the proposed equations. The results of this research showed that the combined discharge coefficient under free flow condition decreased with an increase in the gate relative discharge. Stagnation point was near to the weir crest when overflow started from the weir, and it would travel below (near to the gate lip) when overflow from the weir was increased. Influence of the gate relative discharge on combined discharge coefficient was negligible, but its effect on weir discharge coefficient (due to the stagnation point level changes) was considerable.

Keywords

References

بلوچی ب و زینی وند م، 1391. بررسی آزمایشگاهی ضریب دبی در سازه ترکیبی سرریز- روزنه در شرایط سیلابی. نشریه دانش آب و خاک، جلد 22، شماره 2، صفحه­های 151 تا 164.
سوری ا، مسعودیان م، کردی ا و راتچر ک، 1393. بررسی آزمایشگاهی تغییرات ضریب دبی و افت انرژی در سرریز- دریچه استوانه ای با حرکت قائم. نشریه مهندسی عمران و محیط زیست، جلد 44، شماره 4، صفحه­های 65 تا 78.
صفار س، 1388. بررسی خصوصیات هیدرولیکی جریان ترکیبی بر روی مدل سرریز- دریچه در جریان آزاد. پایان­نامه کارشناسی ارشد سازه­های آبی، دانشکده مهندسی علوم آب دانشگاه شهید چمران اهواز.
قره گزلو م، مسعودیان م، هابر ب و صالحی نیشابوری ع، 1392. اثر سرریز بر دبی دریچه در مدل ترکیبی سرریز- دریچه استوانه­ای. فصل­نامه علمی پژوهشی مهندسی آبیاری و آب، شماره 11، صفحه­های 86 تا 95.
نادری ف، مسعودیان م و راتچر ک، 1393. بررسی فشردگی جانبی جریان در سازه ترکیبی سرریز- دریچه استوانه­ای. نشریه دانش آب و خاک، جلد 24، شماره 4، صفحه­های 77 تا 87.    
Alminagorta O and Merkley G P, 2009. Transitional flow between orifice and non orifice    regimes at a rectangular sluice gate. Journal of Irrigation and Drainage Engineering ASCE 135(3): 382–387.
Burcu A and Kokpınar M A, 2013. Computation of discharge for simultaneous flow over weirs and below gates (H-weirs). Journal of Flow Measurement and Instrumentation 29: 32–38.
Ferro V, 2000. Simultaneous Flow over and under gate. Journal of Irrigation and Drainage Engineering ASCE 126(3):190-193.
Samani J and Mazaheri M, 2009. Combined flow over weir and under gate. Journal of Hydraulic Engineering ASCE 135(3):224-227.
Habibzadeh A, Vatankhah AR and Rajaratnam N, 2011. Role of energy loss on discharge characteristics of sluice gates. Journal of Hydraulic Engineering ASCE 137 (9):1079–1084.
Henderson F M, 1966. Open Channel Flow, Macmillan, New York.
Negm AM, 2000. Characteristics of simultaneous overflow-submerged underflow with unequal contractions. Engineering Bulletin (Ain Shams University) 35(1): 137-154.
Negm AM, Albarahim AM and Alhamid AA, 2002. Combined free flow over weirs and below gate. Journal of Hydraulic Research 40(3): 359- 365.
Water and Soil Science
Volume 27, Issue 2
July 2017
Pages 283-291

Files

Share

How to cite

Statistics