Estimation of dry deposition of inorganics using filter pack data and inferred deposition velocity
Article Abstract:
The National Oceanic and Atmospheric Administration Air Resources Laboratory's multiple-layer canopy resistance model for determination of deposition velocities is used to improve estimation of dry deposition fluxes. Weekly averaged concentrations of sulfur dioxide, nitric acid vapor and selected inorganic components of the small particles were measured at a number of sites in Minnesota over a three-year period and their hourly dry deposition velocities inferred using the model. The Minneapolis-St. Paul metropolitan area showed the highest dry deposition for all substances, with concentrations declining with increasing distance from the metro area.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1996
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A coarse-filter strategy
Article Abstract:
Fire is a major component in natural coarse-filter strategies designed to protect Western forests. Coarse-filter methods preserve biological diversity by maintaining a variety of ecosystems across the landscape. Some of these strategies are reserving portions of landscape for wildlife and allowing natural processes to interact with the fauna and flora. The role fire plays in coarse-filter strategies should be carefully managed especially in ecosystems that have been altered by humans and populated by species endangered by previous wildlife management practices.
Publication Name: Forum for Applied Research and Public Policy
Subject: Science and technology
ISSN: 0887-8218
Year: 1999
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River replication
Article Abstract:
The US Army Corps of Engineers has developed a simulation tool called micromodeling which employs a small-scale physical model to study sediment conditions in rivers and streams. The technique has been used in the navigational design of the Mississippi River; restoration of side channels; bridge scour in rivers and streams; and improvements to flow conditions at locks and dams, since micromodels were introduced by St. Louis District Corps of Engineers in 1994.
Publication Name: Civil Engineering
Subject: Science and technology
ISSN: 0885-7024
Year: 1999
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