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<br />elevation in HEC-RAS to the water sUlface 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 />lllVEL2D. SMS is a pre- and post-processor for RMA2 which allows for the creation ofthe <br /> <br />finite element mesh and associated boundary conditions with a GUl. 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 surface 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 />turbulent flows. 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 /> <br />t3u t3u 011 h( 0'11 0'11) (oa Oh) gun' ( ').1. <br />h8i + hll Ox + hv 0' - p En Ox' + Ery 0" + gh Ox + Ox + ( .1.)' + u' + v. , = 0 <br /> <br />1.486h' <br /> <br />Ov Ov t3v h (o'v o'v) (oa Oh) gvn' ( , .1. <br />h8i + hll Ox + hv 0' - p Eyx Ox' + E", 0" + gh 0' + 0' + ( ')' + II' + v.), = 0 (5) <br /> <br />1.486h' <br /> <br /> <br />oh +h(t3u + t3v) +uoh +voh = 0 <br />iJt Ox 0' Ox 0' <br /> <br />where h <br /> <br />= depth <br />= velocities in cartesian directions <br />24 <br /> <br />u.v <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />1 <br />I <br />