Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2009.2325.2329MojtabaG.K.AbbasB.G.122009912In this study, effect of two types of groynes; bar and blade types on river outer bank protection has been investigated by a physical model. Model includes a canal with 73 cm width, 45 cm height and 115 cm long with two intakes and four bends of 45, 90, 135 and 180°. Experiments have been performed on the 45° bends of model. Results show that permeable groynes in both bar and blade types are effective in outer bank protection. Comparison of two bar and blade types groynes show that blade-types groynes are more economical, but their disadvantages are scour around the groynes. Finally combination of two bar and blade types groynes can be the solution of this problem.]]>Altai, W. and V.H. Chu,1997Booij, R.,1989Bridge, J.S.,1992Brinke, W.B.M., T. Kruyt, N.M. Kroon, A. Berg and J.H. Van den,1999Chen, F.Y. and S. Ikeda,1997Engelund, F.,1974Langendoen, E.J., C. Kranenburg and R. Booij,1994Nagata, N., T. Hosoda and Y. Muramoto,2000Przedwojski, B., R. Blazejewski and K.W. Pilarczyk,1995Uijttewaal, W.S.J.,2005Uijttewaal, W.S.J., D. Lehmann and A. Mazijk Van,2001Weitbrecht, V. and G.H. Jirka,2001Weitbrecht, V., W.S.J. Uijttewaal and G.H. Jirka,2004Westrich, B. and A. Clad,1979Yen, B.C. and K.T. Lee,1965