LEADER 04539cam 2200553Ia 4500001 ocn701553200 003 OCoLC 005 20141212055103.0 006 m d 007 cr bn||||||||| 008 110211s2010 ncuab ob 000 0 eng d 035 (Sirsi) o701553200 035 (OCoLC)701553200 040 ERE |cERE |dERE |dUtOrBLW 043 n-us-nc 049 EREE 090 QE571 100 1 Quafisi, Dimitri. |?UNAUTHORIZED 245 10 Assessment of modern sediment storage in the floodplain of the lower Tar River, North Carolina / |cby Dimitri Quafisi. 260 [Greenville, N.C.] : |bEast Carolina University, |c2010. 300 110 pages : |billustrations (some color), maps (some color), digital, PDF file 336 text |2rdacontent 337 computer |2rdamedia 338 online resource |2rdacarrier 538 System requirements: Adobe Reader. 538 Mode of access: World Wide Web. 502 |bM.S. |cEast Carolina University |d2010. 500 Presented to the faculty of the Department of Geological Sciences. 500 Advisors: John Walsh and D. Reide Corbett. 500 Title from PDF t.p. (viewed April 13, 2011). 520 3 Rivers transport water, sediment, and other constituents from the continent to the sea, but in route material can often become stored temporarily or permanently. Along the Atlantic Coast of the United States, coastal plain rivers such as the Tar River are characterized as low-gradient meandering systems that develop wide floodplains which are subjected to frequent and prolonged flooding. As a result, these rivers are believed to experience storage of sediment, particularly near their estuarine mouths. The lower portion of rivers and their attached estuaries are also environmentally and economically important serving as critical habitat (e.g., nurseries for fish), recreational areas, and transportation pathways. Excess sediment is often considered a significant pollutant and can have adverse effects on biota. Suspended sediment also can supply excess nutrients and trace metals from anthropogenic activity. Previous work in North Carolina suggests that alluvial storage can make up the majority (>50%) of the total sediment delivered to rivers. This study more closely examines the nature of lower floodplain sediment storage and more specifically focuses on calculating sediment accumulation along the Tar River. Cores were collected from three sites along seven different transects perpendicular to the main channel. Analysis of ²¹⁰Pb and ¹³⁷Cs were employed to calculate sediment accumulation rates, and grain-size data were made to inform radionuclide and sedimentation interpretations. Sedimentation rates within the study area range from 0.09 to 1.08 cm/yr. However, several sites appear to have non-steady-state deposition possibly due to major overbank flood events. Grain-size data indicate a mixture of sand and mud at all sites with some variability in the nature of sediment accumulating. Using core observations and LiDAR topographic data, storage across the system is estimated to be approximately 1.26 x 10⁵ t/yr or roughly 66% of the total incoming sediment measured at Tarboro, NC (1.89 x 10⁵ t/yr) in previous works. 504 Includes bibliographical references. 650 0 Sedimentation and deposition |xResearch |zNorth Carolina |zTar River Watershed (Person County-Beaufort County) |=^A87027 650 0 River sediments |zNorth Carolina |zTar River Watershed (Person County-Beaufort County) |xAnalysis. |=^A174730 650 0 Sediment transport |xResearch |zNorth Carolina |zTar River Watershed (Person County-Beaufort County) |=^A20741 651 0 Tar River Watershed (Person County-Beaufort County, N.C.) |=^A760598 653 Sedimentary Geology 653 Geochemistry 653 Geology 700 1 Walsh, J. P. |q(John Patrick), |d1973- |edegree supervisor. |=^A1373511 700 1 Corbett, D. Reide |q(David Reide), |d1971- |edegree supervisor. |=^A1373510 710 2 East Carolina University. |bDepartment of Geological Sciences. |=^A1066239 856 40 |zAccess via ScholarShip |uhttp://hdl.handle.net/10342/3197 949 |ojgml 994 C0 |bERE 596 1 4 998 2399324