Robert G. Darmody

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The Midwest has large riverine exports of nitrogen (N), with the largest flux per unit area to the Mississippi River system coming from Iowa and Illinois. We used historic and current data to estimate N inputs, outputs, and transformations for Illinois where human activity (principally agriculture and associated landscape drainage) have had a dominant(More)
Sedimentation of the Illinois River in central Illinois has greatly diminished the utility and ecological value of the Peoria Lakes reach of the river. Consequently, a large dredging project has been proposed to improve its wildlife habitat and recreation potential, but disposal of the dredged sediment presents a challenge. Land placement is an attractive(More)
required. These basic properties of the soil can then be evaluated to assess the acoustic imaging tradeoffs for The potential application of this work is the detection and imaging detecting and characterizing buried artifacts. The acous-of buried objects using acoustic methodology. To image buried arti-facts, it is vital to know speed and attenuation of(More)
Conversions of Mollisols from prairie to cropland and subsequent changes in crop production practices in the Midwestern USA have resulted in changes in soil organic matter. Few studies have used archived samples, long-term resampling of soils to a depth of 1 m, and space for time studies to document these changes. We resampled soils by depth (0-100 cm) in(More)
Dredging sediments from water bodies in Illinois is done to preserve reservoir capacity, maintain navigation and recreation channels, and restore habitats, but the fate of the sediments is an issue. In anticipation of a major sediment dredging operation in Lake Peoria in the Illinois River, a retrospective study of sediment placement operations was(More)
Analysis of the etch-pit size distributions (PSDs) observed on potassium feldspar and hornblende grains in a soil catena in loess (age = 12,500 y) reveals natural mineral etching rates. Rates estimated for hornblende (6 to 9×10−15mol/m2s) are based on consistent crystallographically controlled etch pits, while rates estimated for potassium feldspar(More)
Paul R. Adamus Alan D. Alton Craig Allan James A. Allen James L. Anderson Neit Anderson Steve I. Apfe lbaum James L. Arndt Robert B. Atkinson Gregor T. Auble W. Michael Aust Jane E. Austin Richard P. Axler Kathy Bailey Carol C. Bask_in Jerry M. Bask_in Roger Becker Barbara L. Bedford Jay C. Bell Pamela S. Botts Roelof M. J. Boumans Jeff H. Braatne Scott D.(More)
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