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Grain Size Distribution of the Surface Sediments Collected during the Lake Michigan Mass Balance and the Environmental Mapping and Assessment Programs

By Eadie, Brian J.

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Book Id: WPLBN0000661889
Format Type: PDF eBook
File Size: 3.63 MB.
Reproduction Date: 2005
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Title: Grain Size Distribution of the Surface Sediments Collected during the Lake Michigan Mass Balance and the Environmental Mapping and Assessment Programs  
Author: Eadie, Brian J.
Volume:
Language: English
Subject: Science., Ecology & environment, National Oceanic and Atmospheric Administration (U.S.)
Collections: National Oceanographic Data Center
Historic
Publication Date:
Publisher: Government Reference Publication

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Eadie, B. J. (n.d.). Grain Size Distribution of the Surface Sediments Collected during the Lake Michigan Mass Balance and the Environmental Mapping and Assessment Programs. Retrieved from http://www.worldebooklibrary.net/


Excerpt
Excerpt: Grain Size Distribution Of The Surface Sediments Collected During The Lake Michigan Mass Balance And The Environmental Mapping And Assessment Programs. The Lake Michigan Mass Balance (LMMB) study, a national demonstration program within EPA, was initiated to develop improved strategies for management and control of toxic chemicals in the coastal environment. The program included measurement and modeling of the transport, fate, and bioaccumulation of four chemicals in Lake Michigan: PCB?s (industrial compounds once widely used in a variety of products, banned since 1982), trans-nonachlor (a chlorinated hydrocarbon originally registered as a pesticide in 1948, banned by EPA in 1988), atrazine (the most widely used herbicide in U.S. corn and sorghum production), and mercury (a toxic element which occurs both naturally and anthropogenically). Over 80% of the inventories of PCBs, TNC, and mercury in Lake Michigan are stored in the sediments. Current estimates are that more of these compounds re-enter the water column via sediment water exchange than via all of the combined external inputs.

Table of Contents
CONTENTS Page 1. INTRODUCTION ............................................................................................................................. 4 2. SEDIMENT SAMPLING.................................................................................................................. 4 3. PARTICLE SIZE DISTRIBUTION MEASUREMENTS................................................................. 6 4. QUALITY ASSURANCE ................................................................................................................. 6 5. SIZE INTERPOLATION .................................................................................................................. 6 6. SPATIAL INTERPOLATION ........................................................................................................... 6 7. DISCUSSION................................................................................................................................... 6 8. ACKNOWLEDGEMENTS............................................................................................................... 8 9. REFERENCES ............................................................................................................................... 10 FIGURES Figure 1. Station numbers and coring locations are shown and color keyed for the collection device. The gray stippled region is the area identified as non-depositional based on the thickness of the gray clay member (Wickham et al., 1978) ................................................................ 5 Figure 2. Size distributions for replicate samples ............................................................................... 7 Figure 3. Size distribution of the 0-1 cm interval of the 55 box cores. The symbols represent the range, 10th, 25th, and 50th percentiles of the data .............................................................. 9 TABLES Table 1. Measured grain size data for the LMMB surface (0-1 cm) sediments .................................. 12 Table 2. Measured grain size data for the EMAP surface (0-1 cm) sediments .................................... 14 Table 3. Linearly interpolated particle size distributions ..................................................................... 19 Table 4. Composite grain size distributions.......................................................................................... 23 APPENDIX Contour Plots-- Surface sediment particle size contour plots in 4 mm increments (symbols represent sample locations), paired with surface sediment cumulative particle size contour plots.

 

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