Download or read book Lower Mississippi River Environmental Program Report 15 Vegetation Development on Revetments Along the Lower Mississippi River written by James W. Webb and published by . This book was released on 1988 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nearly 900 miles of bank protection works (revetments) are in place along the Lower Mississippi River. These structures are composed of a variety of materials and support various degrees of vegetation cover. Plant establishment on revetted banks has implications for both bank stability and wildlife habitat quality; therefore, a study was initiated to investigate the relationship between vegetation development and revetment features and materials. Field sampling at 25 sites indicated that vegetation development was more pronounced on upper than lower banks and on sites protected from direct impacts of high-velocity flows. Loose rock paving (riprap), which is typically employed on upper banks, generally supported the most vegetation. Plants were frequently found growing between the blocks of articulated concrete mat revetments. Asphalt paving had high herbaceous cover, but tree establishment was limited. In general, only two species of trees (Salix nigra and Salix interior) commonly occurred on the lower half of revetted banks. Upper banks and the top bank zone supported a more diverse tree species assemblage. Vines were a major component of revetment plant communities on the upper bank. Ground cover vegetation was more abundant in higher bank zones, but many annual species were able to colonize the lower bank where sediment was deposited as the river receded. (fr).
Download or read book Vegetation Development on Revetments Along the Lower Mississippi River written by and published by . This book was released on 1988 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lower Mississippi River Environmental Program Report 11 Forest Vegetation of the Leveed Floodplain of the Lower Mississippi River written by Charles V. Klimas and published by . This book was released on 1988 with total page 365 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main stem levee system and loess bluffs of the Lower Mississippi River Valley (LMRV) confine 955 miles of river in an area about 600 miles long and up to 20 miles wide. The corridor of unprotected floodplain flanking the lower river supports over one-million acres of forest; about one-quarter of the total bottomland hardwood forest estimated to remain in the LMRV. In 1982, the US Army Corps of Engineers Mississippi River Commission initiated the Lower Mississippi River Environmental Program, which included development of a geographic information system and studies of selected ecosystem components within the confined floodplain. The research reported here was designed to provide a description of forest resources of the study area, with particular attention to forest attributes commonly considered in evaluations of wildlife habitat suitability. (fr).
Download or read book Lower Mississippi River Environmental Program Report 13 Preliminary Environmental Design Considerations Associated with Articulated Concrete Mattress Revetments Along the Lower Mississippi River written by Larry R. Aggus and published by . This book was released on 1988 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: Preliminary environmental design considerations are described for Articulated Concrete Mattress (ACM) revetments along the Lower Mississippi River. These considerations were developed for the Mississippi River Commission for possible use and maintenance of ACM revetments within the Mississippi River and Tributaries Project. The environmental considerations are preliminary inasmuch as they would require additional field testing and engineering and cost and evaluation prior to large-scale implementation. Environmental measures discussed include modification to the upper surfaces of ACM blocks, stone and wood habitat structures, creation or expansion of eddies, artificial spawning devices, and management of vegetation for fish, macroinvertebrates, and wildlife. A review of the literature relating to environmental values of ACM revetments is presented. (FR).
Download or read book Lower Mississippi River Environmental Program Report 2 A Physical Description of Main Stem Levee Borrow Pits Along the Lower Mississippi River written by Eugene G. Buglewicz and published by . This book was released on 1988 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: Twenty-five borrow pits along the main stem levee system of the Lower Mississippi River were investigated with regard to selected physical, chemical, and biological resources as part of the Lower Mississippi River Environmental Program. Objectives of the levee borrow pit investigation are to develop an inventory of environmental resources of the borrow pits and to develop environmental design criteria for borrow pits to be used during levee construction. The 25 borrow pits were located between the levees along the Mississippi River from near New Madrid, Missouri (River Mile (RM) 877) to near Belmont, Louisiana (RM 151). Data on fishes, water quality, macrobenthos, and sediments were collected during the summer of 1981. A topographic field survey of each borrow pit was conducted during 1982. A vegetation survey was conducted from 1981 to 1983 as part of a companion study of bird and mammal use. Vegetation data are summarized in this report. Levee borrow pits range in size from one acre ponds to lakes of 50 or more acres. Traditional indicators of environmental quality based on morphological characteristics do not generally fit these unique aquatic basins. The borrow pit basins are generally shallow with most of the bottom in the photic zone. Physico-chemical indicators suggest a productive aquatic habitat. Although the data are survey in scope, it represents the first time a large number of borrow pits representing the entire Lower Mississippi River have been described and compared. (fr).
Download or read book Lower Mississippi River Environmental Program Report 8 Ecological Features of Eddies Associated with Revetments in the Lower Mississippi River written by Steven P. Zimpfer and published by . This book was released on 1988 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study was conducted from late April through mid- July 1985 to evaluate habitat quality of revetment eddies in the Lower Mississippi River. Sites were established at three locations: river miles 372 (Natchez, Mississippi), 192 (White Castle, Louisiana), and 35 (Port Sulphur, Louisiana). At White Castle, samples were taken a 3-week intervals throughout the study. The Port Sulphur and Natchez sites were visited once in large May/early June. The White Castle eddy was a persistent feature of the river's hydrology. Flow rates were slower in the eddy, and upstream currents were always present at one or more nearshore stations. Variation in current speed and direction was greatest at the eddy's periphery. The Port Sulphur and Natchez eddies were less well defined, and current directions within the eddies were variable. Most water quality perameters were not significantly different between microhabitats. Drifting insects, particularly dipterans, were most abundant in the mainstream at high currents in April and May regardless of diel period. Zooplankton densities were highest during April when adjacent floodplains were inundated, declining with decreasing river stage. Larval fish abundance was not significantly related to habitat or current speed. (fr).
Download or read book Forest Vegetation of the Leveed Floodplain of the Lower Mississippi River written by and published by . This book was released on 1988 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lower Mississippi River Environmental Program Report 4 Environmental Design Considerations for Main Stem Levee Borrow Areas Along the Lower Mississippi River written by Larry R. Aggus and published by . This book was released on 1986 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: Environmentally important physical features of main stem levee borrow areas along the Lower Mississippi River are identified and presented as design considerations. These design considerations were developed for the Mississippi River Commission for possible use in design and construction of the Mississippi River levees portion of the Mississippi River and Tributaries Project. Routine, relatively inexpensive environmental measures and more complex, costly measures are identified and discussed. Environmental measures discussed include borrow pit size, depth, shape, and vegetation and cover for both fish and wildlife. A review of the literature relating to the ecological characteristics of borrow pits and similar water bodies is presented. (Author).
Download or read book Ecological Databases of the Lower Mississippi River written by P. D. Close and published by . This book was released on 1992 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lower Mississippi River Environmental Program Report 9 An Ecological Investigation of Revetted and Natural Bank Habitats in the Lower Mississippi River written by John A. Baker and published by . This book was released on 1988 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemical, physical, and biological attributes of the aquatic habitats associated with four revetments and two natural banks in the Lower Mississippi River were surveyed during summer and fall 1985. The revetments were located at approximately river miles 446, 370, 309, and 41; the two natural banks were located at river miles 368 and and 41. With the exception of water temperature in the fall, temperature, dissolved oxygen, pH, conductivity, turbidity, oxidation-reduction potential, total organic carbon, and dissolved and suspended solids showed relatively little variation over the entire study reach. Natural bank substrates were characterized by consolidated clays, with sand and silt, or sand and gravel, occurring frequently. Revetted banks were characterized by articulated concrete mattress (ACM), about one-half of which appeared to be overlayed with sand and silt. Macroinvertebrate community composition depended primarily upon the substrate type and current speed encountered at both revetted and natural banks. ACM surface modification experiments showed that mean densities, biomasses, and number of taxa of macroinvertebrates were greater on grooved blocks than on other modification type, or on control blocks. Both traditional fish collecting gears and hydroacoustics indicated differences in fish density between the two natural banks, among the three revetted banks, between the natural and revetted banks at sites at which both occurred, and between seasons. (fr).
Download or read book Government Reports Annual Index written by and published by . This book was released on 1990 with total page 1312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lower Mississippi River Environmental Program Report 3 Bird and Mammal Use of Main Stem Levee Borrow Pits Along the Lower Mississippi River written by Stephen P. Cobb and published by . This book was released on 1986 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soil used to construct the main stem levees is obtained from adjacent land, usually between the levee and the river. Surface depressions resulting from excavation of such material are known as borrow pits. A series of borrow pits is generally found along the riverward toe of the main stem levee system throughout its length. The Levee Borrow Pit Investigation (LBPI) was designed to provide data on fishery, benthos, wildlife, vegetation, physical, and chemical aspects of main stem levee borrow pits. Specific objectives of the LBPI are: (1) To develop an inventory of wildlife and fishery resources of the main stem levee system borrow pits; and (2) To formulate environmental design considerations for main stem levee system borrow pits. The first fieldwork of the LBPI included fish and aquatic sampling by the US Army Engineer Waterways Experiment Station (WES) from June through August 1981. Topographic surveys of selected pits were conducted by the US Army Engineer District (USAED), Vicksburg, in 1982. Wildlife surveys were carried out by WES on a seasonal basis for 2 years from December 1981 to October 1983. This report presents partial results of the wildlife study conducted as part of the LBPI.
Download or read book Lower Mississippi River Environmental Program Report 5 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 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results of the investigation indicated that there is a significant amount of aquatic habitat found within dike systems (pool habitat) and associated sandbars. Total aquatic habitat surface area ranged from 10,971 acres at a 0-foot LWRP river stage to 25,778 acres at a stage of +15 feet LWRP for pool areas, and from 14,404 acres to 23,599 acres at these river stages in sandbars associated with dike systems. These data were based on hydrographic surveys taken in dike systems between 1978 and 1982. Four main types of dike structures were present in the river: transverse, L-head, vane, and stone-filled pile. A total of 156 individual dike structures had been constructed through 1982, with a total length of 60.1 miles. Transverse dikes constitute 77 percent of the dikes that have been built. Hydrologic analyses based on a 29-year period of record indicated that dike system pool habitat is relatively unstable during the river's low-flow period in the summer and fall (July through December); average number of days per event or occurrence of pool habitat in three 5-foot river stage intervals ranged from 7 to 11 days with 3.88 to 5.15 events per year. An estimated 54.5 to 100 percent of the total quantity of dike structure is inundated an average of 79 percent of the time during the river's high-flow period (January through June).
Download or read book Lower Mississippi Region Comprehensive Study written by Lower Mississippi Region Comprehensive Study Coordinating Committee and published by . This book was released on 1974 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lower Mississippi River Environmental Program Report 7 An Ecological Evaluation of Five Secondary Channel Habitats in the Lower Mississippi River written by John A. Baker and published by . This book was released on 1987 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemical, physical, and biological attributes of the aquatic habitat of five Lower Mississippi River secondary channels were surveyed during summer (July) 1984; two of the channels were resurveyed during fall (October). Dikes at least partially restricted flow through two of the channels (Lakeport Towhead and Cottonwood Bar, river miles 470 and 528, respectively); flow through the remaining three (Wolf Island, river mile 935; Island 8, river mile 915; Profit Island, river mile 250) was not restricted. The channel at which flow was most restricted, Lakeport Towhead, showed both physical and chemical differences from the others. Electroshocking catches of fish were highest at Profit Island due to unusually large collections of catfishes. The macroinvertebrate assemblages found within the channels were similar overall, and they appeared to reflect the current speed and substrate conditions. The dike macrofauna was similar to that noted in earlier studies on the Lower Mississippi River. Dikes that block or greatly restrict flow through secondary channels produce habitats in which the macroinvertebrate and fish assemblages are quite different from undiked channels, at least when river stages are near or lower than the controlling elevation of the dikes. (fr).
Download or read book Lower Mississippi River Environmental Program Report 10 Evaluation of Bird and Mammal Utilization of Dike Systems Along the Lower Mississippi River written by James M. Sigrest and published by . This book was released on 1987 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: A bird and mammal survey was conducted on 10 dike systems in the Lower Mississippi River (river miles 377 to 885, AHP) in the late summer and fall of 1984 as part of the Mississippi River Commission Lower Mississippi River Environmental Program. The totals recorded during the 3-month survey were comprised of 126,612 birds in 92 species and 599 mammals in 11 species. Results of the survey indicated frequent use of these areas by migrating and resident populations of birds. Mammals did not use the dike systems to any great extent. Greater numbers of birds and mammals were noted at dike systems containing open areas interspersed with woods and pools. Monthly bird concentrations were strongly influenced by migrants, especially swallow and blackbird species. These two categories constituted approximately 90 percent of the total bird observations. Large dike systems, such as Redman-Robinson Crusoe, Island 62, and Ashport-Golddust, provided large acreages and habitat diversity, which in turn resulted in greater numbers of sightings throughout the survey.
Download or read book An Ecological Evaluation of Five Secondary Channel Habitats in the Lower Mississippi River written by and published by . This book was released on 1987 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
