BS 158H Stream Ecology 1

BS 158H Stream Ecology 1 - to a low elevation (north to...

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BS 158H: Stream Ecology 1 19:59 Two Rivers: Flint and Pere Marquette Why does Flint have a more variable flow than Pere Marquette? o Not very far apart so geographic location not a factor o Human impact differs on both river so could be a factor  Hydrograph- plots how much water is flowing down river vs. time  o All other factors are minute to the main one which is glaciers caused the  main difference between the rivers Glaciers Anatomy and Flow o Glaciers flow much like river from high elevation to low elevation More ice at high elevations and it melts at lower elevations Tremendous pressure at the lower elevation levels of the glacier Zone of Accumulation- net ice gain, more snow falls during winter  than melts during summer Zone of Ablation (wastage)- net ice loss, due to melting,  evaporation, or sublimation As glacier flows, it erodes and carries rock debris from a high elevation 
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Unformatted text preview: to a low elevation (north to south in the continental glaciers), glacier acts as a conveyor belt • Glaciers and Landforms o Moraine- ridges composed of accumulated glacial till (unsorted and unstratified rock debris) taller deposits of glacial till occur where the glacier spent more time Terminal Moraine- end moraine from farthest advance of glacier Recessional Moraines- series of end moraines (till deposition) where recession has stalled Ground Moraine- continuous shallow deposition of till as glacier recedes o Outwash Plains- produced off the glacier’s front edge by sediment-laden melt water (deposits of outwash are stratified and sorted) Groundwater driven streams o Kettle holes and pitted outwash- formed from buried ice left by glacier o Lacustrine- glacial lake bed; silt and clay deposits; runoff-driven streams 19:59 19:59...
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This note was uploaded on 11/11/2010 for the course BS 158H taught by Professor Elzinga during the Fall '08 term at Michigan State University.

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BS 158H Stream Ecology 1 - to a low elevation (north to...

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