Investigation of wetland characteristics by using finite element method

HEC RAS background and unsteady flow governing equations are C given in this research. The HEC RAS 3.0 unsteady solver is adapted from Barkau's UNET model (Brunner, 2001). UNET utilizes a four point implicit scheme to solve the unsteady flow equations (Barkau, 1997). The continuity and momentum equations are: partial derivativeA/partial derivativet + partial derivativeS/partial derivativet + partial derivativeQ/partial derivativex - q(i) = 0 (continuity) partial derivativeQ/partial derivativet + partial derivative(VQ)/partial derivativex + gA(partial derivativez/partial derivativex + S-f) = 0 (Momentum) where: x distance along the channel t = time Q = flow A = cross-sectional area S storage q(1) = lateral inflow per unit distance The finite difference approximations of the terms in the continuity equation are: DeltaQ (Q(j+1)-Q(j)) + theta(Delta Q(j+1)-Delta Q(j)) The aim of this paper is to investigate the behaviour of a wetland by different scenarios: 1) The bathymmetrie changes after the earthquake 2) Seepage from the river and sea-shore 3) To give shallow water equations by using finite elements method