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Controls of Suspended Sediment Concentration, Nutrient Content, and Transport in a Subtropical Wetland

Gregory B. Noe · Judson W. Harvey · Raymond W. Schaffranek · Laurel G. Larsen
[author information]

© Society of Wetland Scientists 2009. Posted with permission; Wetlands (2010) 30:39-54.

Note: Paper is available from the Springer website (journal subscription is required)

Abstract

>Abstract
Introduction
Methods
Results
Discussion
Acknowledgments
References
Tables and Figures
Redistribution of largely organic sediment from low elevation sloughs to higher elevation ridges is a leading hypothesis for the formation and maintenance of the native ridge and slough landscape pattern found in peat wetlands of the Florida Everglades. We tested this redistribution hypothesis by measuring the concentration and characteristics of suspended sediment and its associated nutrients in the flowpaths of adjacent ridge and slough plant communities. Over two wet seasons we found no sustained differences in suspended sediment mass concentrations, particle-associated P and N concentrations, or sizes of suspended particles between ridge and slough sites. Discharge of suspended sediment, particulate nutrients, and solutes were nearly double in the slough flowpath compared to the ridge flowpath due solely to deeper and faster water flow in sloughs. Spatial and temporal variations in suspended sediment were not related to water velocity, consistent with a hypothesis that the critical sheer stress causing entrainment is not commonly exceeded in the present-day managed Everglades. The uniformity in the concentrations and characteristics of suspended sediment at our research site suggests that sediment and particulate nutrient redistribution between ridges and sloughs does not occur, or rarely occurs, in the modern Everglades.

Keywords Entrainment · Everglades · Nitrogen · Particle · Phosphorus


Introduction >


(Received: 12 August 2008 / Accepted: 17 August 2009 / Published online: 9 December 2009)


G. B. Noe (*) · J. W. Harvey · R. W. Schaffranek · L. G. Larsen
U.S. Geological Survey, 430 National Center, Reston, VA 20192, USA
*e-mail: gnoe@usgs.gov

Related information:

SOFIA Project: Effect of Sheet Flow on Transport of Suspended Particles and Particle-Associated Nutrients in the Everglades Ridge and Slough Landscape: Phase II



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