The Chang, Sin Zee creator Wang, Tsan-Wen Chairperson Suphat Vongvisessomjai Co-Chairperson Tawatchai Tingsanchali Examination Committee Preecha Kamronrithisorn Examination Committee RSEA, R.O.C Scholarship Donor text th Bangkok Asian Institute of Technology 1987 monographic eng

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86 p. The purpose of this research is to study the area of scour hole around the bridge pier. One of major causes of bridge foundation failures is the scour holes created by flowing water around the bridge piers. In order to produce a safe and economical design of bridge protection, the engineer needs to make an accurate prediction to the area of the scour hole around the bridge piers. This study is experimental work using physical models matched with three sizes of sands (coarse sand , median sand and fine sand ) and variation of flowing conditions, considering the c l ear-water flow , change the angles of attack from an aligned pier. Four cylindrical piers and five blunt-nosed piers with five length to width ratios are tested. Theoretical analysis shows that the area of scour hole around the bridge pier is a function of pier Froude number , pier Reynolds number , pier dimension and bed material . Experimental results show good agreement with the theoretical consideration. A general formulae for design purposes for various influencing factors (flow , pier and sand ) to the area of scour hole around the pier have been derived. Also, a simplified formulae has been proposed to compute the area of protection around the bridge piers are included. A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology Thesis (M.Eng.) - Asian Institute of Technology,1987 Scour at bridges Asian Institute of Technology. http://203.159.5.9/ait-thesis/detail.php?q=B19424 http://203.159.5.9/ait-thesis/detail.php?q=B19424 030698 20260817163223.0