TY - JFULL AU - Dilavar Khan and Z. Ahmad PY - 2011/12/ TI - Stabilization of Angular-Shaped Riprap under Overtopping Flows T2 - International Journal of Civil and Environmental Engineering SP - 549 EP - 554 VL - 5 SN - 1307-6892 UR - https://publications.waset.org/pdf/12730 PU - World Academy of Science, Engineering and Technology NX - Open Science Index 59, 2011 N2 - Riprap is mostly used to prevent erosion by flows down the steep slopes in river engineering. A total of 53 stability tests performed on angular riprap with a median stone size ranging from 15 to 278 mm and slope ranging from 1 to 40% are used in this study. The existing equations for the prediction of medium size of angular stones are checked for their accuracy using the available data. Predictions of median size using these equations are not satisfactory and results show deviation by more than ±20% from the observed values. A multivariable power regression analysis is performed to propose a new equation relating the median size with unit discharge, bed slope, riprap thickness and coefficient of uniformity. The proposed relationship satisfactorily predicts the median angular stone size with ±20% error. Further, the required size of the rounded stone is more than the angular stone for the same unit discharge and the ratio increases with unit discharge and also with embankment slope of the riprap. ER -