Download or read book Empirical Analysis of Effects of Dike Systems on Channel Morphology of the Lower Mississippi River written by Casey M. Mayne and published by . This book was released on 2021 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Environmental and Water Quality Operational Studies Morphologic Effects of Lower Mississippi River Dike Fields written by Nelson R. Nunnally and published by . This book was released on 1986 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dikes are used extensively on large, meandering rivers to help maintain navigation channels. Dike fields alter flow velocities and sedimentation patterns, thereby affecting river morphology and the amount and quality of aquatic habitat. Some investigators have theorized that sedimentation induced by the dike fields constructed on the lower Mississippi, largely since 1960, is altering river morphology and aquatic hatibat in a manner similar to the changes that have been observed in the lower Missouri. Others are of the opinion that dike fields on the lower Mississippi do not typically fill completely with sediment, and the pools they contain have increased the amount of slack-water habitat. Low-water photographs taken in 1962 and 1976 and comprehensive hydrographic surveys done in 1962-64 and 1974-75 were used to measure morphologic changes in diked and undiked reaches. River surface area between river miles 320 and 954 was classified as main channel, secondary channel, slough, chute, or pool. The 1962 and 1976 areas in each category were measured from the photographs. River stage at time of photography averaged about 2 ft (0.6 m) lower in 1976, so 1976 measurements were adjusted for stage differential, based on width mesurements taken from the hydrogaphic surveys. Results were summarized for diked and undiked reaches.
Download or read book Morphologic Effects of Lower Mississippi River Dike Fields written by Nelson R. Nunnally and published by . This book was released on 1986 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Brief History and Summary of the Effects of River Engineering and Dams on the Mississippi River System and Delta written by Jason Scott Alexander and published by . This book was released on 2012 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physical and Hydrologic Characteristics of Aquatic Habitat Associated with Dike Systems in the Lower Mississippi River River Mile 320 to 610 AHP written by Stephen P. Cobb and published by . This book was released on 1985 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Summary Report Model prototype Comparison Study of Dike Systems Mississippi River written by John J. Franco and published by . This book was released on 1982 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Model prototype Comparison Study of Dike Systems Mississippi River written by John J. Franco and published by . This book was released on 1982 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: In connection with the MRC Potamology Program, movable-bed models studies were conducted of seven of the most complex and troublesome reaches of the Mississippi River to obtain some quick general indications of the effectiveness of plans proposed for the improvement and stabilization of those reaches. Because of the limited time available, the studies were conducted in an existing facility with little or no adjustment of the models and in some cases without a base test. Because of the limited size and shape of the facility available, only a relatively short reach of the river including the problem could be reproduced in each model with little or no overbank areas. The horizontal scales varied with each reach depending on its size and shape and were much smaller with a higher distortion of the linear scales than was considered desirable for studies of this type. An analysis of the model results compared with developments in the river based on an evaluation of considerable prototype data indicated that the types of models used predicted, at least qualitatively, most of the principal trends that actually occurred in the river with the plans tested. The degree of accuracy of the models varied and depended to a considerable extent on the model adjustment, characteristics of the reach, flow conditions, and similarity between plan tested and actual construction.
Download or read book Environmental Effects of Dikes and Revetments on Large Riverine Systems written by Mark B. Sandheinrich and published by . This book was released on 1986 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: A review of pertinent research, suggests that dikes and revetments have short-term and long-term effects on major riverine ecosystems. Short-term effects may be beneficial and include increases in aquatic habitat diversity physical stability which, in turn, results in high densities and diversities of fish and macroinvertebrates within the main stem of the river. Dike fields are intermediate physically, chemically, and biologically to the main channel and backwaters of rivers. Dike fields often support the most diverse fish and macroinvertebrate community of any habitat within the river. But community composition is less stable than backwaters and is dependent upon river stage and water velocity. Moderate and slow-water areas within dike fields provide important spawning and nursery areas for many lotic species of fish within the modified river. Revetments of broken rock stabilize banks and provide additional hard substrate for colonization by dense populations of invertebrates. Interstitial spaces between rocks may provide areas of moderate flow for juvenile and forage fish. Long-term effects of river training structures may be detrimental to the biotic integrity of the river.
Download or read book Analysis of Lower Mississippi River Dike Field Performance written by and published by . This book was released on 2001 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numerical Analysis of Dike Effects on the Mississippi River Using a Two dimensional Adaptive Hydraulics Model AdH written by C. Jared McKnight and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Resume of Research Studies of Hydraulic Characteristics of Mississippi River Channels written by P. W Pierce (III.) and published by . This book was released on 1967 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Investigation of Proposed Dike Systems on the Mississippi River Report 2 New Madrid Bar Reach Hydraulic Model Investigation written by Thomas J Pokrefke (Jr) and published by . This book was released on 1981 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: This investigation is one phase of a general model study to determine the effectiveness of dike systems proposed for improvement of troublesome reaches on the Mississippi River. This report describes and gives results of tests concerned with the development of plans for the improvement of the New Madrid reach of the river, which is located about 890 river miles above Head of Passes. A movable-bed model reproducing approximately 11 miles of the Mississippi River to a horizontal scale of 1:480 and a vertical scale of 1:60 was used to develop plans that would improve and stabilize the navigation channel through the reach and eliminate or reduce the need for maintenance dredging. The channel in the vicinity of New Madrid, Missouri, has been especially troublesome because of the divided flow and poor channel alignment. Flow near New Madrid is divided by a large island and further divided by a large sandbar between the channel along the left side of the island and the channel along the left bank. The navigation channel at the time of initiation of this study was along the left side of the island and then turned sharply toward the left bank before crossing back toward the right bank downstream of the island. Maintenance of the channel along the right side of the island was required as an access to the port facilities at the city of New Madrid. The plans tested included the construction of four dikes along the left riverbank and the dredging of a pilot cut along the lower portion of New Madrid bar and modifications to the alignment or number of dikes.
Download or read book Impact of Dike Structures on Sediment Transport in the Alluvial Rivers written by and published by . This book was released on 2009 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: OBJECTIVES: The project has two components: one is to apply a computational model (EnSed2D) into a practical river engineering project in the Mississippi River, and the other is to collect laboratory experimental data for model verification, and to perform risk and uncertainty analysis of modeling results to explore uncertain parameters affecting the predictions. In particular, this project aims to conduct laboratory experiments of flow hydrodynamic and sediment transport around dikes. Flow and sediment transport field around the dikes of various alignments (e.g. angled, perpendicular, submerged, or emerged) will be measured in a series of experiments. These measured data will be used to verify the numerical model, and examine how dike structures of various alignments affect or improve water environments for in-stream habitat. APPROACH: The proposed project consists of three parts: 1) conducting laboratory experiments to develop data for model verifications; 2) applying the EnSed2D model to the field site for evaluating the effectiveness of various design alternatives; 3) performing risk and uncertainty analysis of the modeling results to support management decisions. The objective is to study turbulent flow and sediment transport near dike structures of various geometries through an integrated laboratory experimental, numerical modeling, and field application. The result will be a feasible design of dike structures that can effectively reduce sediment deposition and maintain a favorable flow condition during winter low flows in the island. The risk and uncertainty of the selected design will be analyzed using the Monte Carlo simulation.
Download or read book Indicators of Ecosystem Structure and Function for the Upper Mississippi River System written by Nathan R. De Jager and published by . This book was released on 2018 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book River Mechanics written by Pierre Y. Julien and published by Cambridge University Press. This book was released on 2018-04-12 with total page 527 pages. Available in PDF, EPUB and Kindle. Book excerpt: Completely updated and with three new chapters, this analysis of river dynamics is invaluable for advanced students, researchers and practitioners.
Download or read book A Guide to Stream Habitat Analysis Using the Instream Flow Incremental Methodology written by Ken D. Bovee and published by . This book was released on 1982 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Ocean and Cryosphere in a Changing Climate written by Intergovernmental Panel on Climate Change (IPCC) and published by Cambridge University Press. This book was released on 2022-04-30 with total page 755 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Intergovernmental Panel on Climate Change (IPCC) is the leading international body for assessing the science related to climate change. It provides policymakers with regular assessments of the scientific basis of human-induced climate change, its impacts and future risks, and options for adaptation and mitigation. This IPCC Special Report on the Ocean and Cryosphere in a Changing Climate is the most comprehensive and up-to-date assessment of the observed and projected changes to the ocean and cryosphere and their associated impacts and risks, with a focus on resilience, risk management response options, and adaptation measures, considering both their potential and limitations. It brings together knowledge on physical and biogeochemical changes, the interplay with ecosystem changes, and the implications for human communities. It serves policymakers, decision makers, stakeholders, and all interested parties with unbiased, up-to-date, policy-relevant information. This title is also available as Open Access on Cambridge Core.
