10 فروردین 1403
محمد واقفي

محمد واقفی

مرتبه علمی: دانشیار
نشانی: دانشکده مهندسی - گروه مهندسی عمران
تحصیلات: دکترای تخصصی / مهندسی عمران
تلفن: 077-31342401
دانشکده: دانشکده مهندسی

مشخصات پژوهش

عنوان Experimental Study on Flow Pattern and Scour Hole Dimensions Around a T-Shaped Spur Dike in a Channel Bend Under Emerged and Submerged Conditions
نوع پژوهش مقالات در نشریات
کلیدواژه‌ها
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مجله International Journal of Civil Engineering
شناسه DOI
پژوهشگران مجتبی مهرآیین (نفر اول) ، مسعود قدسیان (نفر دوم) ، مجتبی خسروی مشیزی (نفر سوم) ، محمد واقفی (نفر چهارم)

چکیده

In this paper, the scour hole dimensions around submerged and emerged spur dike in a 90° bend along with the mean and turbulent flow field were investigated experimentally. Two types of re-circulating flow at the downstream of the spur dike and around the spur dike wing were observed. A direct relation between the estimated bed shear stress using TKE and the scour process prevails. More attentions is needed in estimating the bed shear stress using vertical velocity fluctuations. The scour hole dimensions increase by increasing the ratio of radius of channel bend to channel width, the Froude number of the spur dike, ratio of the length of spur dike to channel width and ratio of the approach mean flow velocity to the approach flow velocity at threshold condition. However, vice versa trends were observed by increasing ratio of the spur dike length to the median sediment size, ratio of the wing length of spur dike to the length of spur dike and the submergence ratio.A particular location of the spur dike in the sharp bend was specified beyond which the scour hole dimensions increase. The ratio of the spur dike length to the median sediment size has a secondary effect on the scour hole dimensions. New equations are proposed for prediction of the scour hole dimensions considering the submergence ratio along with other effective parameters.