Reconstructing Sediment Chronologies in the Hudson River Estuary

doi:10.1017/CBO9780511550539.008

6 - Reconstructing Sediment Chronologies in the Hudson River Estuary

Published online by Cambridge University Press: 06 January 2010

J. Kirk Cochran ,

David J. Hirschberg and

Huan Feng

Edited by

Jeffrey S. Levinton and

John R. Waldman

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J. Kirk Cochran: Affiliation:
Marine Sciences Research Center, Stony Brook University
David J. Hirschberg: Affiliation:
Marine Sciences Research Center, Stony Brook University
Huan Feng: Affiliation:
Dept. of Earth and Environmental Studies, Montclair State University
Jeffrey S. Levinton: Affiliation:
State University of New York, Stony Brook

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Summary

abstract The sediments of the Hudson River Estuary record chronologies of the history of sediment and contaminant accumulation. The distribution of natural and anthropogenic radionuclides in the sediments provides a means of deciphering the sediment chronology because the rates of supply and decay of the radionuclides are known. Radionuclides that are useful in this context include naturally occurring 234Th (Thorium), 7Be (Beryllium), and 210Pb (Lead), as well as anthropogenic 137Cs (Cesium), input from atmospheric testing of atomic weapons and in association with the use of nuclear power. Sediment accumulation in the Hudson, as in many other estuaries, is controlled by a dynamic equilibrium among the processes responsible for transporting sediment. This equilibrium can shift seasonally, moderated by river discharge, tidal mixing, and other natural forces, or be shifted by human activities such as dredging or pier construction. Sediment chronologies of Hudson cores determined from natural radionuclides show that coves, marginal areas, and the inner harbor are areas of enhanced accumulation. Short-term storage of sediment is evident off Manhattan following the spring freshet, but these high rates of sediment accumulation are not sustained on longer, decadal time scales. Sediment chronologies also help to interpret the sediment record of particle-associated contaminants in the context of temporal changes of contaminant input and accumulation. To fully realize this application, it is necessary to build a long-term database of cores for which chronologies have been determined. Key stations should be re-cored over time to document trends in contaminant accumulation.

Type: Chapter
Information: The Hudson River Estuary , pp. 65 - 78

DOI: https://doi.org/10.1017/CBO9780511550539.008 [Opens in a new window]

Publisher: Cambridge University Press

Print publication year: 2006

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