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<br />=---- <br />---------"-- <br /> <br />g. It is helpful for later reference if all sections are identified <br /> <br /> <br />by river mile, and are located on a map. Reach lengths and n-values <br /> <br /> <br />should be entered on the map, also. <br /> <br />Section 4.02. Flow Boundary Geometry at Bridges <br /> <br />Describing the flow boundaries in the vicinity of bridges is <br />difficult because flow is three dimensional. It is necessary to visua- <br />lize current directions for complicated flow patterns, position cross <br />sections perpendicular to the flow and identify that portion of each <br />cross section which conveys flow in order to model ,flow boundaries. <br />The following figure illustrates the problem: <br /> <br /> 8 <br />CD ..- CD <br />"- ...- <br /> "- ...- <br /> ....... ...- <br /> ....... ...- <br /> "- ...- <br /> "- ..... <br /> ..... @ <br />@ <br /> / b "- <br /> / I( --I "- ',~ <br /> ~/ <br /> , <br /> //// / :. ~, <br /> 0 <br /> "- <br /> / LL '\ <br /> / ~ <br /> / <br /> / <br /> ;' <br />@ @) <br /> <br /> <br />Fig. 4.01. Flow boundary geometry at bridges showing <br />contracting and expanding flow <br /> <br />4.04 <br />