Laboratory Investigation of the Parameters of the Submerged Plates on the Turbidity Currents Characteristics

Document Type : Research Paper

Authors

Department of Water Engineering, Faculty of Agriculture, University of Birjand, Birjand, Iran.

10.22055/jhs.2021.36477.1159

Abstract

In dam reservoirs, the turbidity current is usually the cause of sediment transfer and deposition. Therefore, it is necessary to study this phenomenon. Here, experiments were made on the effects of the impermeable submerged plates on turbidity current head. In order to investigate the effects of the impermeable submerged plates, some parameters of the plates were changed, such as shape, angle of mounting of the plates with respect to the current axis, location and the dimensions of the plates. The results showed that the flow velocity of the turbidity current decreased by 25 to 27.1% with respect to the control state in case of different shapes of plates mounted. The analysis of the position of the plates showed that in different conditions, the flow velocity decreases 45.1% relative to the control state. Various mounting angles also resulted in 8.6 to 27.1% lower velocity relative to the control. Changing the width and height of the plates reduced the head velocity from 21.8 to 43.9% and 10 to 45.2%.

Keywords


Abyar, M. Effects of angle and position of impermeable submerged plates on the turbidity current, M.Sc. thesis of water structures, University of Birjand, Faculty of agriculture, Department of Science and Water Engineering, 2016, pp. 98 (In Persian).
Altinakar, S., Graf, W. H., Hopfinger, E. J. (1990). Weakly depositing turbidity current on a small slope. Journal of Hydraulic Research, 28(1).pp:25:55-80.
AsghariPari, S., Mohagheghiyan, S. M. (2015). Numerical investigation effect in using plate and tilt columnar barrier in controlling turbidity current. Iranian Journal of Irrigation and Drainage, 2 (9).pp:9:357-366 (In Persian).
AsghariPari, S.A., Kashefi Pour, M., Ghomeshi, M. (2010). Experimental investigation on controlling of sedimentary density current using constructing obstacle. Journal of irrigation science and engineering (Agriculture Scientific Journal), 33(2). pp: 15:1-15 (In Persian).
Daryaee, M., Kashefipour, S., Ghomeshi, M. (2013). Experimental study of the effect of slope and bed roughness on head and body velocities in sedimentary density current. Journal of irrigation science and engineering, 37(3). pp: 10:21-31 (In Persian).
Daryaee, M., Kashefipour, S.M., Ghomeshi, M. (2014). Study of obstacle and roughness impacts on controlling sedimentary density current. Journal of water and soil science, 24(4). pp: 9:1-9 (In Persian).
Ghorban Moghadam, A.A., Ghomeshi, M., Nasrollahpur, R. (2013). Laboratory investigation of the effect of cylindrical barriers on the turbidity currents head motion. Nine int River Engineering Conference (9 IREC). University of Shahid Chamran Ahvaz (In Persian).
Ghorbani, Z., Khozeymehnezhad, H., Ramezani, Y. (2017). Experimental study on the effects of the shapes and arrays of submerged impermeable plates on turbidity current characteristics. Journal of water and soil conservation, 23(6).pp:20:143-162 (In Persian).
Graf, W.H. (1983). Hydraulics of reservoir sedimentation. International Water Power and Dam Construction, 35. pp: 7: 45-52.
Hosseini, A. The effects of plants stem diameter in vegetation on the turbidity current under laboratory conditions, M.Sc. thesis, Water civil engineering, University of Zabol, Faculty of Engineering, 2014 (In Persian).
Khalili naftchali, A. Akbarpour, A., Khozeymehnezhad, H. Varjavand, P. (2016). Experimental Study on Head of Saline Density Current Affecting by Vegetation, Journal of Irrigation Sciences and Engineering, 39(1). pp: 155 -166. (In Persian).
Khalili, A., Khozeymehnezhad, H., Akbarpour, A., Varjavand, P. (2015). Experimental study on the effects of artificial vegetation density on gravity current’s flow characteristics. Iranian Journal of Irrigation and Drainage, 9 (1). pp: 12:83-95 (In Persian).
Khosravi, A. Investigation of the dimensions of impermeable submerged plates on the turbidity current under laboratory conditions, M.Sc. thesis of water structures, University of Zabol, Faculty of Water and soil, 2016. pp. 90 (In Persian).
Oehy, C., Schleiss, A. (2003). Effects of obstacles and jets on reservoir sedimentation due to turbidity currents (No. LCH-BOOK-2008-015). EPFL-LCH.
Peters, W. D. Rough-surface gravity current flows. Ph.D. thesis, University of New Brunswick. Canada, 1999.
Pourkayd, S., Hasunizadeh, H., Abad zadeh, A. (2014). Investigation of the effects of roughness variations on the height of the current head and body of the turbidity currents. 12th Iranian Hydraulic Conference, College of Agriculture and Natural Resources University of Tehran, Irrigation Engineering Department (In Persian).
Pourkayd, S., Hasunizadeh, H., Kashefipour, M., Kaydkhorde, A. (2013, May). In Vitro Study of Roughness, Slope and Concentration on Body Average Speed of Current Sedimentary Flow, the First National Congress on Water Crisis, Islamic Azad University Khorasgan Branch (Isfahan). (In Persian).
Tabatabaei, S.M. Khozeymehnezhad, H., Akbarpour, A., Varjavand, P. (2017). Investigating Effects of obstacles Arrangement on the velocity of Density Current in experimental conditions, Journal of Science and Engineering, 4(1). pp:53-64. (In Persian).
Turner, J. S. (1973). Buoyancy effects in fluids: Cambridge monographs on mechanics and applied mathematics.
Varjavand, P., Hosseinzadeh Dalir, A., Ghomeshi, M., Farsadizadeh, D. (2013). Experimental study on the effects of artificial bed roughness on instantaneous velocity fluctuations of saline density currents. Journal of Water and Soil, 27 (4). pp: 10:839-849 (In Persian).