Aformulaforthecomputationsoflocalscourdepthattheheadofspursisderivedaccordingtotheequilibriumprincipleofincipientmotionofsedimentparticle.Theproposedformulaisverifiedwithlaboratorydataandfieldmeasurements.Inthederivationofthisformula,twodifferentscourresistanceforces,thecohesiveforceandthegravitationalforce,areconsidered,andtheintegratedcoefficientiscalibratedusingdatafromtheLowerYellowRiver.