Effect of Roughened Flood Plain of Symmetrical Compound Channel on The Resistance of Flow
Al-Rafidain Engineering Journal (AREJ),
2019, Volume 24, Issue 1, Pages 31-38
AbstractThis research deals with the experimental study of the effect of roughened the flood plain of symmetrical compound channel (having 18 cm main channel and 29 cm flood plain width from both sides) on the resistance of flow using different size of gravel roughness (D50=6.8 ,16.8, 24,47) mm, as well as the flood plain is smooth.
Five discharges (34,27.8,19.35,12,7.87)L/sec were carried out for each case, The compound channel was divided to 3 sections perpendicular to the direction of flow and each of them divided to 7 sections , 4 in flood plain and 3 in main channel . Pitot static tube used for velocity measurements and point gage for water surfacelevel measurement as well as the temperature of water was measurement, From the measurements it can be concluded that the velocity over the flood plain was reduced clearly up to 40 – 70 % when the flood plain roughened by course roughness compare with that of smooth one , while the velocity in the main channel increased to satisfy the continuity equation . Empirical equations were developed to combine the resistance coefficient n with other variables include the flow and geometry characteristics
1- Mahmoud F. Maghrebi and MajidRahimpour“Streamwisevelocity distribution in irregular shaped channels having composite bed roughness “ Flow Measurement and Instrumentation 17 (2006) 237–245.
2- Charles &Darrien" Study of Flow ina Non-SymmetricalCompoundChannel with Rough FloodPlain" Journal - The Institution of Engineers, Malaysia (Vol. 69, No.2, June 2008).
3- Jason W. Kean ، etal , "Test of a Method to Calculate Near-Bank Velocity and Boundary Shear Stress" Journal of Hydraulic Engineering ASCE / JULY (2009).
4- K.Shiono.etal "The effect of floodplain roughness on flow structures, bedforms and sediment transport rates in meandering channels with over bank flows :part I" j.H.Reasearch (2013) .
5- NeginBinesh and HosseinBonakdari"Longitudinal Velocity Distribution in Compound Open Channels: Comparison of Different Mathematical Models "Vol, 8 (9): 1149-1157 (2014) .
6- Rahul Sahoo, "Study of velocity profile of a converging compound channel using Ansys" BSc. thesis pp. 8-27 (2014).
7- Abbas parsaie et al.,"Flow discharge estimation in compound open channel using theoretical approches" Springer (2016).
8- BahramRezaei and AlirezaSafarzade “Numerical modeling of flow field in prismatic compound channels with different floodplain widths ” Journal of Applied Research in Water and Wastewater, 3 (2), 2016, 260-270.
9-حیدر،علی محسن " دراسة مختبریة للجریان الموضعی المتغیر فی القنوات المفتوحة "رسالة ماجستیرجامعة الموصل قسم السدود والموارد المائیة (2009) .
- Article View: 82
- PDF Download: 81