Browsing by Subject "fen"

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    Peatland Hydrological Dynamics in Northern Minnesota
    (2015-09) Roush, Benjamin
    I investigated peatland water table elevation responses to large precipitation events and long precipitation-free periods for a fen, poor fen, and bog, and pore water chemistry trends in a fen boundary zone, in northern Minnesota. Water table change compared to both precipitation and dry periods was slower in the fen than the poor fen or bog, a response attributed to connections between the fen and the regional groundwater aquifer. Water table change compared to larger dry periods remained consistent over a 51-year period and among peatlands. Calcium-silicon ratios in fen pore water were collected along transects perpendicular to the fen boundary. Larger calcium-silicon ratios at edge of the fen were interpreted as originating from a regional aquifer source, with minimal influence from vegetative calcium uptake and upland subsurface runoff. The extent of the fen-upland boundary zone was demarcated where calcium-silicon ratios matched average fen and stream outlet calcium-silicon ratios.
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    Sioux Nation Fen Dye Trace
    (1994-01-26) Green, Jeffrey A
    Water levels in the fens located within Sioux Nation Wildlife Management Area are threatened by proposed pumping from the nearby Burr Well Field. The fen is part of a complex hydrologic environment with many springs fed by upwelling ground water that may be coming frQm either a shallow sand unit located 30-40 feet below the land surface or a deeper aquifer, located approximately 120 feet below the land surface. To help define the source of the ground water feeding the fen, I am requesting Jeff Green's assistance in conducting a dye trace near the fen. By injecting dye into a well completed in the shallow aquifer, it is hoped the ground water flow system can be defined better.