The possibility of using solid wastes as an aggregate inconcrete has received increasing attention in recent years asone promising solution to the escalating solid-waste problem.Since gravel concrete is the well known type of concrete inEgypt, its proportion in demolition wastes is substantial andt.he wake charact.erist.ics,t.henon-lineari t. Y of’dif’f’icult.when t.hemoreboundary. The boundary &It.erschan€;e t.he vor-t-ex sheddingplat.e/wake int.eract.ion.In t.he present. t.hesis, a case of’ an impulsively-st.ar·t.ednow about. an inclined f’lat. plat.e rie ar- a plane boundary issimulat.ed by an inviscid model, which is called ”discret.efr-e que noyandaf’f’ect.st.hevor-t.ex model”, combined wrt.h t.he surf’ace siO€;ular·it.y met.hodCvor-t.ox-Lat, t.ice met.hod) in which t.he plat.e is replaced by adist.ribut.ion of’ point. vor-t.rce s called boundary vort.ices. Thef r-e-e sheal.~ layers which emanat.e f’r-orn t.he sides of’ t.he plat.e