Resume of research studies of hydraulic characteristics of Mississippi River channels interim report FY 1967 : Potamology Research Project 10
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Pierce, P. W.; Elliott, Charles M. (Charles Morelle)
Potamology ReportSummary: This report presents a brief description of field and office studies of the hydraulic characteristics of selected cross sections and reaches of the Lower Mississippi River through FY 1966. These studies are a part of the general potamology investigations for improving techniques for stabilizing the bed and banks of the Mississippi River. The general purpose of the previous studies was to analyze the hydraulic factors and elements of the river cross sections, establish allowable limits of width-depth and area-depth relations, and to determine the relation of radii of curvature to width and depth. Since April 1966, more intensive studies have been made of six typical stable, straight, and divided flow reaches. Also, 5 reaches have been selected for detailed studies relating to the effect of existing or proposed dikes. Current objectives of the investigations include a general study of the hydraulic variables relating directly to channel geometry; developing criteria for the design of channel stabilization structures and evaluation and prediction of the effects of existing and proposed channel stabilization structures. A general concept of the relations of energy loss rate or slope to channel geometry and roughness is presented and related to river engineering. The concept infers that the channel bed and shape will accommodate the energy slopes either within the section or from section to section. Where flat energy slopes prevail the channel will be deep and narrow with relatively smooth bed and large sediment transport capacity for unit width. Where steep slopes occur the channel will be shallow and wide with relatively rough bed and smaller sediment transport capacity. The basic data program is discussed including the presentation of survey data, plan maps, sections, profiles, and tabulations of computed data. The relations of the more important hydraulic variables are shown by plotted curves for comparison. These variables include those of channel geometry, energy loss, bed form and roughness, and sediment transport. Corrective measures based on these factors are discussed and the application of the relationships are illustrated by an example of channel design. Future considerations will be directed toward development and refinement of channel design procedures utilizing hydraulic data being obtained in the current detailed study program. The importance of determining sediment transport capacity and the relation to other variables is being emphasized. The ultimate goal of the Vicksburg District potamology program is to gain a workable knowledge of the controlling basic principles and variables involved in the transport of water and sediment and to apply this knowledge to channel stabilization problems.
Cold Regions Research and Engineering Laboratory (U.S.)Engineer Research and Development Center (U.S.)
Potamology; Mississippi River; Hydraulics; Hydrodynamics; Channel stabilization; Channel training; Bank stabilization; River banks; Sediment transport; Hydraulic structures
Potamology investigations report ; 19-2.
Approved for public release; distribution is unlimited.