scholarly journals From Dessert Farming to Closed System The University of Arizona, Environmental Research Laboratory

1992 ◽  
Vol 6 (4) ◽  
pp. 291-293
Author(s):  
Hiroshi Mizutani
Keyword(s):  
Closed System ◽  
Research Laboratory ◽  
Environmental Research ◽  
University Of Arizona ◽  
Environmental Research Laboratory ◽  
The University

Groundwater Plume Mapping in a Submerged Sinkhole in Lake Huron

2005 ◽  
Vol 39 (2) ◽  
pp. 65-69 ◽  
Author(s):  
Steven A. Ruberg ◽  
Dwight F. Coleman ◽  
Thomas H. Johengen ◽  
Guy A. Meadows ◽  
Hans W. Van Sumeren ◽  
...  
Keyword(s):  
Tracking System ◽  
Lake Huron ◽  
Environmental Research ◽  
State University ◽  
University Of Michigan ◽  
Remotely Operated Vehicle ◽  
Short Baseline ◽  
High Concentrations ◽  
Environmental Research Laboratory ◽  
The University

A multidisciplinary exploratory project team from the Institute for Exploration, the Great Lakes Environmental Research Laboratory, Grand Valley State University, and the University of Michigan located and explored a submerged sinkhole in Lake Huron during September 2003. A CTD system and an ultra-short baseline (USBL) acoustic navigational tracking system integrated with an open frame remotely operated vehicle (ROV) provided high-resolution depth, temperature, and conductivity maps of the sinkhole and plume. Samples were also peristaltically pumped to the surface from a depth of 92 meters within and outside of the sinkhole plume. A 1-2 m thick cloudy layer with a strong hydrogen sulfide odor characterized the water mass close to the plume. Relative to ambient lake water, water samples collected within this layer were characterized by slightly higher (4-7.5 °C) temperatures, very high levels of chloride and conductivity (10-fold) as well as extremely high concentrations of organic matter (up to 400 mg C/L), sulfate, and phosphorus. Our observations demonstrated the occurrence of unique biogeochemical conditions at this submerged sinkhole environment.

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