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  5. Technical Report
Please use this identifier to cite or link to this item: https://hdl.handle.net/11681/6466
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dc.contributor.authorDowner, Charles Wayneen_US
dc.contributor.authorDeLaune, R. D.en_US
dc.contributor.authorNyman, J. Andyen_US
dc.coverage.temporalWetlands Research Program (U.S.)en_US
dc.creatorLouisiana State University (Baton Rouge, La.). Laboratory for Wetland Soils and Sedimentsen_US
dc.creatorUniversity of Southwestern Louisiana. Department of Biologyen_US
dc.creatorU.S. Army Engineer Waterways Experiment Stationen_US
dc.date.accessioned2016-03-23T20:09:58Zen_US
dc.date.available2016-03-23T20:09:58Zen_US
dc.date.issued1995-08en_US
dc.identifier.govdocTechnical Report WRP-SM-7en_US
dc.identifier.urihttp://hdl.handle.net/11681/6466en_US
dc.descriptionTechnical Reporten_US
dc.description.abstractWetlands were constructed in the Grenada Lake fluctuation zone during the late 1950s shortly after construction of the reservoir. These wetlands were planted with grain to attract waterfowl for hunting and were termed shooting ponds. After a change in the rule curve of the reservoir caused more frequent flooding of the shooting ponds, planting and water-level manipulation of the ponds were discontinued. Over the years, the shooting ponds became valuable wetland habitat with natural vegetation. These wetlands were chosen as a demonstration site to study long-term sedimentation patterns in wetlands constructed in the fluctuation zone of reservoirs. Nineteen sediment cores were collected from eight different wetland areas. Sediment accumulation in the wetlands was determined by Cs-137 analysis of the cores. The cores were also sampled for bulk density, percent moisture, organic content, and grain size. Analysis showed that the wetlands were accreting 0.49 cm/year of sediments and accumulating 4.35 kg/m²/year of sediments. The average bulk density of cores was 1.00 g/cm³. Average mineral content was 94 percent. Sediments were 98.2-percent fines by weight. No distinct patterns in sedimentation among wetlands was apparent. It is thought that micro differences between the wetlands play a large role in determining sedimentation at this site.en_US
dc.description.sponsorshipPrepared for U.S. Army Corps of Engineers, Washington, DC 20314-1000en_US
dc.description.tableofcontentsPreface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v 111 Conversion Factors, Non-SI to SI Units of Measurement . . . . . . . . . . . . x 1-Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2-Background Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Climate Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Reservoir Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Reservoir Drainage Basin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Reservoir Flows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Reservoir Sedimentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Description of Wetlands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Construction and general condition . . . . . . . . . . . . . . . . . . . . . 9 Vegetation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Relation to reservoir sediment resurvey . . . . . . . . . . . . . . . . . . 10 3-Methodologies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Sampling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Laboratory Analyses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4- Results and Discussion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Preliminary Sampling Results . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 1993 Sampling Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Discussion of Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 137C s .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Bulk density and moisture content . . . . . . . . . . . . . . . . . . . . . . 20 Organic matter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1 Particle size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Distribution of sediments in wetlands . . . . . . . . . . . . . . . . . . . . 21 Accumulation of sediments . . . . . . . . . . . . . . . . . . . . . . . . . . 21 5-Reservoir and Wetland Influences on Sedimentation . . . . . . . . . . . . . 23 Elevation and Flooding Frequency . . . . . . . . . . . . . . . . . . . . . . . 23 Drainage Basin Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Wetland Surface Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Wetland Size/Drainage Basin Ratio . . . . . . . . . . . . . . . . . . . . . . . 25 Wetlands' Position in Reservoir . . . . . . . . . . . . . . . . . . . . . . . . . 26 Flow Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Discussion of Regression Analyses . . . . . . . . . . . . . . . . . . . . . . . 26 6-Conclusions and Design Recommendations . . . . . . . . . . . . . . . . . . 29 Sediment Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Design Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Habitat Implications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3 Appendix A: 1993 Sampling Locations . . . . . . . . . . . . . . . . . . . . . A1 Appendix B: 137Cs Profiles from 1993 Samples . . . . . . . . . B 1 Appendix C: Bulk Density and Moisture Content of 1993 Samples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C 1 Appendix D: Grain-Size Analyses of 1993 Samples . . . . . . . . . . . . . D 1 SF 298en_US
dc.format.extent115 pagesen_US
dc.format.mediumPDFen_US
dc.language.isoen_USen_US
dc.publisherU.S. Army Engineer Waterways Experiment Stationen_US
dc.relationhttp://acwc.sdp.sirsi.net/client/en_US/search/asset/1040700en_US
dc.relation.ispartofseriesTechnical Report (Wetlands Research Program (U.S.)) ; no. Technical Report WRP-SM-7en_US
dc.rightsApproved for public release; distribution is unlimited.en_US
dc.sourceThe ERDC Library created this digital resource using one or more of the following: Zeta TS-0995, Zeutcehl OS 12000, HP HD Pro 42-in. map scanner, Epson flatbeden_US
dc.subjectConstructed wetlandsen_US
dc.subjectSediment transporten_US
dc.subjectSedimentationen_US
dc.subjectDepositionen_US
dc.subjectGrenada Lake (Miss.)en_US
dc.subjectReservoirsen_US
dc.titleCharacteristics and long-term sedimentation patterns of wetlands constructed in the fluctuation zone of Grenada Lake, Mississippien_US
dc.typeReporten_US
Appears in Collections:Technical Report

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