Record Display for the EPA National Library Catalog
RECORD NUMBER: 48 OF 81
|OLS Field Name||OLS Field Data|
|Main Title||MAGIC Simulation of Surface Water Acidification at, and First Year Results from the Bear Brook Watershed Manipulation, Maine, USA.|
|Author||Norton, S. A. ; Wright, R. F. ; Kahl, J. S. ;|
|CORP Author||Maine Univ., Orono. Dept. of Geological Sciences. ;Norsk Inst. for Vannforskning, Oslo.;Corvallis Environmental Research Lab., OR.|
|Additional Subjects||Acidification ; Watersheds ; Bear Brook ; Water pollution ; Air water interactions ; Experimental design ; Maine ; Surface waters ; Water chemistry ; Hydrology ; Air pollution ; Computerized simulation ; Soil water ; Ion exchanging ; Acid neutralizing capacity ; pH value ; Nitrogen oxides ; Sulfur oxides ; Chlorine ; Nitrification ; Reprints ; MAGIC model ; Model for Acidification of Groundwater in Catchments|
The catchments of East and West Bear Brooks, Maine, USA, with similar stream chemistries and hydrographs, have been hydrologically and chemically monitored for 3.5 years. These clear water streams are low in ANC (0-70 microeg/litre), with variations caused by changing concentrations of base cations, SO4, NO3, and Cl. After one year of treatment, the response of the stream chemistry and the response modelled by MAGIC are similar. Episodes of high discharge in the treated catchment are not characterized by lower ANC and pH, and higher Al than prior to the manipulation. Concentrations of NO3 have increased about 10 microeg/litre during the dormant season, presumably due to additional nitrification of N and NH4. Discharge-chemistry relationships indicate that changes in stream chemistry, except for NO3, are dominated by ion exchange reactions in the upper part of the soil profile.