Groin Configurations: An Approach towards Stable Lowland Rivers with Improved Environmental Functions

Authors: M. Alauddin, T. Tsujimoto

Abstract:

Dynamicity of stream channels along with environmental concern is the key issue to address in lowland rivers like Jamuna in Bangladesh. The groins are important structures in attaining the improved river environment, but their effective functioning is not evident yet with the present design. Considering the present demands, an approach through modification of groin configurations is planned to function more natural way in dynamic lowland rivers. Four different configurations including the conventional one are considered in the study, and the changes in hydro- and morpho-dynamics affected by various structures are investigated in the laboratory. Results show that the modified combined groin favors gradual deceleration of flow towards the channel side and minimizes local scour noticeably. This favors stable regular channel and improve environmental functions.

Keywords: Lowland river, dynamicity, river environment, groin configuration, local scour.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1336246

References:

[1] T. Tsujimoto, Y. Toda, H. Furuhata and H. Shionoya, "Ecological function of series of groins and induced morphology in estuary segment of river with tidal motion - downstream reach of the Kiso River, Japan,” 8th Int. Simp. Ecohydraul. 2010, COEX, Seol, Korea, paper no. 274, 2010.
[2] G.J. Klaassen and K. Vermeer, "Channel characteristics of the braiding Jamuna River, Bangladesh,” Proc. Int. Conf. on River Regime. Wiley, New York, pp. l73-189, 1988.
[3] M.M. Rahman, H. Nakagawa, A.T.M. Khaleduzzaman, T. Ishigaki and Y. Muto, "On the formation of stable river course,” Annu. of Disas. Prev. Res. Inst., Kyoto Univ., No. 47 B, 2004.
[4] E. Mosselman, Bank protection and river training along the braided Brahmaputra-Jamuna River, Bangladesh, Braided Rivers (eds., Smith, Best, Bristow and Petts), Blackwell Publishing, pp.270-281, 2005.
[5] P.C. Klingeman, S.M. Kehe and Y.A. Owusu, "Streambank erosion protection and channel scour manipulation using rockfill dikes and gabions,” (No. WRRI-98), 1984.
[6] C. Ishii, H. Asada and T. Kishi, "Shape of separation region formed behind a groin of non-overflow type in rivers,” XX IAHR Congress, Moscow, USSR, 405-412, 1983.
[7] F. Y. Chen and S. Ikeda, "Horizontal separation in shallow open channels with spur dikes,” J. Hydroscience and Hydraul. Eng., 15(2), pp. 15-30, 1997.
[8] R. J. Garde, K. Subramanya and K. D. Nambudripad, "Study of scour around spur-dikes,” J. Hydraul. Div., Am. Soc. Civ. Eng., 87(HY6), 23–37, 1961.
[9] B. W. Melville, "Local scour at bridge abutments,” J. Hydraul. Eng., 118(4), 615–631, 1992.
[10] A. K. Barbhuiya and S. Dey, "Local scour at abutments: A Review,” Sadhana,Vol. 29, Part. 5, pp. 449-476, 2004.
[11] H. Zhang, H. Nakagawa, K. Kawaike and Y. Baba, "Experiment and simulation of turbulent flow in local scour around a spur dyke,” Int. J. Sediment Res., vol. 24(1), pp.33-45, 2009.
[12] M. Nazim Uddin, M. M. Hoque and M. M. Rahman, "Flow Field Around Bank Protection Structures Along the Jamuna River,” 17th congress IAHR APD 2010, Paper no 3d043, 21st to 24th February, Auckland, New Zealand, 2010.
[13] M.A. Van Heereveld and R.O.T. Zijlstra, "River Groins for the Future - Harmonising today's demands in innovative groin design,” In: Proc. the 32nd Congress of IAHR. CORILA (ISBN 88-89405-06-6), 2007.