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Brown Bullhead from the Ashtabula River Illustrating the External Tumors Observed

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May 1, 1993

Sampling colloids and colloid-associated contaminants in ground water Sampling colloids and colloid-associated contaminants in ground water

It has recently been recognized that mobile colloids may affect the transport of contaminants in ground water. To determine the significance of this process, knowledge of both the total mobile load (dissolved + colloid-associated) and the dissolved concentration of a ground-water contaminant must be obtained. Additional information regarding mobile colloid characteristics and...

Authors

Debera A. Backhus, Joseph N. Ryan, Daniel M. Groher, John K. MacFarlane, Philip M. Gschwend

Ecosystems Mission Area, Toxic Substances Hydrology, Contaminant Biology, Environmental Health Program

April 1, 1993

Confirmation of rate-dependent behavior in water retention during drainage in nonswelling porous materials Confirmation of rate-dependent behavior in water retention during drainage in nonswelling porous materials

In the water retention process in porous material, changes in water content are assumed to be independent of the rate at which the matric potential varies. Periodically, researchers have presented results that do not support this assumption, indicating that water retention may be rate-dependent under certain conditions. In the present study, long-term experiments were performed on five...

Authors

Jim Constantz

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

April 1, 1993

Restoration of lowland streams: an introduction Restoration of lowland streams: an introduction

This paper introduces the Lowland Streams Restoration Workshop that was held in Lund, Sweden in August 1991.Attenders at the Workshop participated in working groups which discussed and reported on the state of knowledge of stream restoration and identified critical areas of information need. Currently, most restoration efforts are emission‐orientated (i.e. waste‐water management), while...

Authors

L.L. Osborne, P.B. Bayley, L.W.G. Higler, B. Statzner, F. Triska, T. Moth Iverson

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 4, 1993

Hydrologic budget and nitrogen distribution for an agricultural study plot in claypan soil and glacial till near Centralia, Mo.--May 1991 to May 1992 Hydrologic budget and nitrogen distribution for an agricultural study plot in claypan soil and glacial till near Centralia, Mo.--May 1991 to May 1992

No abstract available.

Authors

Brian P. Kelly, L.N. Plummer

Water Resources Mission Area, Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program, Central Midwest Water Science Center

January 1, 1993

Understanding the toxicity of contaminants in sediments: beyond the bioassay-based paradigm Understanding the toxicity of contaminants in sediments: beyond the bioassay-based paradigm

No abstract available.

Authors

Samuel N. Luoma, James L. Carter

Water Resources Mission Area, Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 1993

Aspects of the biogeochemistry of methane in Mono Lake and the Mono Basin of California Aspects of the biogeochemistry of methane in Mono Lake and the Mono Basin of California

Above-ambient levels of methane and higher hydrocarbons were detected in the atmosphere of the Mono Basin. These gases emanated from several different sources, including natural gas seeps (thermogenic and biogenic), and methanogenic activity in sediments. Seeps were distributed over nearly 33% of the lake bottom and were also present in the exposed former lakebed. They originated from...

Authors

Ronald S. Oremland, Laurence G. Miller, Charles Colbertson, S.W. Robinson, Richard L. Smith, Derek R. Lovley, Michael J. Whiticar, G. King, Ronald P. Kiene, Niels Iversen, Melinda Sargent

Water Resources Mission Area, Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 1993