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<br />II. DESCRIPTION OF MODELS EVALUATED <br /> <br />The characteristics of the six numerical models of flow and sediment <br />transport in movable-bed channels evaluated in the present study are <br />summarized in this chapter. The models are HEC2SR, KUWASER, UUWSR, HEC-6, <br />FLUVIAL-ll, and SEDIMENT -4H. Summari es of the model s' characteri st i cs were <br />first prepared on the basis of the individual modelers' final reports <br />submitted to the Committee, and the references cited therein. Each modeler <br />then was requested to review the Committee's description of his model. The <br />model ers I suggesti ons and correct ions have been incorporated into the <br />following descriptions. <br /> <br />A. HEC2SR (HEC-2 with Sediment Routing~: <br />1. Developer: Simons, Li & Associates, Inc. (SLA), .1980 <br />2. Previous Applications: <br />(1) Boulder Creek, Larimer County, Colorado (SLA, 1980) <br />(2) Salt River, Phoenix, Arizona (SLA, 1980) <br />(3) Santa Cruz Ri ver, Tucson, Ari zona (SLA, 1981) <br />(4) Canada del Oro Wash, Pima County, Arizona (SLA, 1981) <br />(5) Rillito Creek, Pima County, Arizona (SLA, 1981) <br /> <br />3. Basic Concepts: <br /> <br />The mode I was developed for simul at i ng watershed sediment yi e I d and the <br />attendant aggradation and degradation in a river system. HEC2SR uses the HEC- <br />2 backwater-computati on program developed by Eichert (1976), at the Corps of <br />Engi neers (COE), Hydrologic Engi neeri ng Center (HEC), for cal cuI ation of <br />backwater profiles. The following assumptions are incorporated into the HEC-2 <br />program (Eichert, 1981): <br /> <br />(1) Flow is steady and gradually varied. <br />(2) Flow is one dimensional and hydrostatic pressure prevails at any <br />point in the channel. <br />(3) The total energy head is the same for all poi nts in a cross sect i on <br />(one-dimensional assumption). <br /> <br />3 <br />