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A depth-integrated finite-element model (RMA-2V) was applied on a section of the Upper Mississippi River to study the hydraulic characteristics of the floodplain-river system. The area that has been modeled is called "Montrose Flats." Aquatic vegetation is abundant at this location, and the flow structure needs to be evaluated in order to study the nutrient transport conditions within this area. The present study focused on a large oval eddy that was observed to form in this area near the downstream end of the Devil's Creek delta. Causative factors for this eddy were examined by using this numerical model. Results indicate that the eddy can be simulated by this model and that numerical study is a feasible way to...
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Movement of recreational boats in a waterway such as the Upper Mississippi River System (UMRS) may generate waves of sufficient degree to impact the river biota and the stability of the shorelines. A research project aiming to determine the characteristics of waves generated by recreational craft within the UMPS has been completed, and this is the first of a two-part paper that presents results. Part II presents the results of uncontrolled movement. To meet the objectives of the project, 246 controlled runs were made with 12 different boats at two sites, one on the Illinois River and the other on the Mississippi River. Data from this study indicated that recreational boats can generate from 4 to 40 waves per event,...
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This paper presents the research results of statistical parameters associated with turbulence in a natural river caused by the movement of navigation traffic. Movement of navigation traffic within restricted inland waterways, such as the Illinois, Mississippi, or Ohio Rivers, changes their flow characteristics temporarily in space and time. These spatial and temporal changes must be quantified in order to assess their efforts on biologically sensitive areas, and they have seldom been evaluated for natural waterways. Data are collected from the Illinois River to evaluate these changes. The longitudinal and lateral components of fluctuating velocity, Reynolds stress, turbulent intensities, turbulent kinetic energy,...
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This report summarizes the data collected by the Illinois State Water Survey from the Ohio River to determine the physical impacts of navigation. The Louisville District of the U.S. Army Corps of Engineers initiated the field project on the Ohio River in which various physical, chemical, and biological data were collected in connection with the movement of tows with barges. The Illinois State Water Survey participated in the collection of physical data with respect to barge traffic. Barges with tows of varying horsepower were rented by the Corps of Engineers and navigated up and down the Ohio River at predetermined frequencies at the test site. This experimental river traffic was controlled as to speed, direction,...
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Turbulent characteristics of flow velocity in a natural river were systematically analyzed in this study. Flow velocities were measured with time at six different lateral locations and at three different vertical elevations on a major navigable waterway in the United States. Analyses of the velocity data include the cross-sectional and vertical distributions of longitudinal and transverse velocity components (u, v), the fluctuating velocity components (u1, v1) and their frequency-distribution curves, turbulent intensities (�x'�y), and turbulent shear stress (scientific formula not reproduced). These analyses have shown that the strongest velocity fluctuation occurs near the main channel area above the river bed.
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