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08-02-04
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08-02-04
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1/6/2005 2:50:59 PM
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<br /> <br />Two Dimensional Hydrodynamic Modeling <br />Pool 3 Mississippi River <br /> <br /> <br />- - ":'''-.~-'~' <br /> <br />~'- ,.~\".1>"'" <br />''';'\'/'':'1~1 <br /> <br />\,;';';,:::>',;"\ <br /> <br />;>iA <br /> <br />Project Tasks: <br />- 2-dimensional modeling of Mississippi River <br />- Modify RMA -2 grid to permit modeling of nine alternatives <br />- Assess effectiveness of each alternative <br /> <br />Project Description: <br />The Modeling of Pool 3 of the Mississippi river near Hastings, Minnesota involved the use <br />of a 2-dimensional hydrodynamic model to assess the effectiveness of three different <br />alternatives at each of three widely separated locations within the pool. The focus of the <br />project was: reduce the amount of dredging necessary in the lower pool by promoting <br />sediment transport through the reach; improve the outdraft cond~ions experienced by <br />boats just downstream of Lock and Dam 2 and; increase fish and wildlife habitat through <br />improving the bathymetric diversity of the pool. <br /> <br />Polaris Group modified the model grid developed by WEST consultants of Bellevue, <br />Washington to incorporate the design alternatives proposed by the St. Paul District of the <br />U. S. Army Corps of Engineers. After confirmation that the modified grid model replicated <br />the results of the original calibrated model, Polaris Group evaluated a series of proposed <br />in-stream modifications. Following review, Polaris Group modeled a set of final design <br />alternatives which met the needs of the COE. <br />
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