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<br />elevation in HEC-RAS to the water surface elevations surveyed in on October 22nd, it was <br /> <br />possible to approximate the average Manning n for the channel. <br /> <br />Two-Dimensional Modeling using SMS and RMA2 <br /> <br />SMS is the Surface-Water Modeling System, a commonly used graphical user interface (GUI) <br /> <br />to a number of computational fluid dynamic models including RMA2, FESWMS, and <br /> <br />HIVEL2D. SMS is a pre- and post-processor for RMA2 which allows for the creation of the <br /> <br />finite element mesh and associated boundary conditions with a GUI. SMS was developed at <br /> <br />Brigham Young Universities Environmental Modeling Research Laboratory and is distributed <br /> <br />by contract through Environmental Modeling Systems, Inc. (EMS-I). <br /> <br />RMA2 is a two-dimensional depth averaged finite element hydrodynamic model <br /> <br />created for the Corps of Engineers in 1973. RMA2 computes water surfaee elevations and <br /> <br />horizontal velocity components for sub critical, free-surface flow in two-dimensional flow <br /> <br />fields using a finite element solution of the Reynolds form of the Navier Stokes equations for <br /> <br />turbulentflows~ The forms of the depth-integrated equations of fluid mass and momentum <br /> <br />conservation in two directions are shown below. <br /> <br />(3) <br />0u0u0u h ( ;Pu . 02U 1 (i7a Oh) gun2 (2 2)1. <br />h-;Ji+ hu &+ hv 0; - p Erx &2 + EX}' 0;2} + gh Ox + & +( 1.) 2 + u + v 2 = 0 <br />1.486h6 <br /> <br />t3v t3v t3v h ( 02V . 02V 1 ( oaoh 1 . gvn2 1 <br />h i7t + hu & + hV0; - p Eyx &2 + Eyy 0;2) + gh 0; + i7y) + ( . 1.) 2 + (u2 + v2)2 = 0(5) <br />. .. 1.486h6 <br /> <br />oh +h(Ou + t3vl +uOh +voh = 0 <br />i7t & i7y) & i7y <br /> <br />where h <br /> <br />u,V <br /> <br />= depth <br />= velocities in cartesian directions <br />24 <br />