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<br />6 <br /> <br />. <br /> <br />TY. Modcls <br /> <br />A. Physical moJels <br />Froude model <br /> <br />F = F <br />m p <br />(,1r.t \ ?fI"'-'; <br /> <br />Used for a II opc" chanJle I (r i vcr J <br />models. Sometimes distorted scalc <br />used. Adjustment for roughness' <br />necessary. Lightweight sediment <br />often used. <br /> <br />Reynolds model <br />R = R <br />m p <br /> <br />Used for closed conduit flow models <br />where gravity is unimportant comparcd <br />to viscous and pressure forces. <br /> <br />B. Mathematical models <br /> <br />Used when reliahle equations arc <br />available to describe flow of watcr <br />and sediment. Particularly valuable <br />with physical model ;lIld whcn time <br />varying phenomcna arc of interest. <br />Larger regions of thc river can bc <br />modeled mathematically. Model is <br />limited by size of the computer. <br /> <br />C. River models <br /> <br />1. Physical <br /> <br />Evaluate the performance of hydraulic <br />structures and their interaction with <br />the river cnvironment. Also used to <br />. .verify mathematical models. <br /> <br />2.' Mathematical <br /> <br />Same as for.physical models, except <br />more versatile for rapidly looking <br />at.a large number of altcrilatives =. <br />considering not only specific sites <br />and structures but'their interaction <br />with the river system and its <br />.tributaries. <br /> <br />. <br />