Title Experimental Study of the Effect of Base-level fall at the Beginning of the Bend on Reduction of Scour around a Rectangular Bridge Pier Located in the 180 Degree Sharp Bend Type Article Keywords Not Record Abstract پايين افتادگي بستر بصورت طبيعي و يا غير طبيعي در رودخانه ها انجام مي گردد.... Researchers Mohammad Vaghefi (First researcher) ,