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Lab 8 – Groundwater and Glaciers

Lab 8 – Groundwater and Glaciers. Groundwater Definitions. Water Table Zone of aeration (Undersaturated zone/vadose zone) Zone of saturation (Saturated zone/phreatic zone) Flow lines Aquifers Water table contour lines – indicate depth to water table, like a topo map. Aquifers.

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Lab 8 – Groundwater and Glaciers

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  1. Lab 8 – Groundwater and Glaciers

  2. Groundwater Definitions • Water Table • Zone of aeration (Undersaturated zone/vadose zone) • Zone of saturation (Saturated zone/phreatic zone) • Flow lines • Aquifers • Water table contour lines – indicate depth to water table, like a topo map

  3. Aquifers • Types of Aquifers • Confined • Unconfined

  4. Wells/Cones of Depression

  5. Wells/Cones of Depression

  6. Groundwater Contamination • Maybe be from large area or a point source • Hard to trace path (unknown karst features, lithologies, etc.) • May end up in unexpected location • May have extremely long residence time

  7. Karst • Karst – distinctive topography that indicates dissolution of underlying rock (usually LS) • Sinkholes • Solution valleys (linear sinkhole) • Springs • Disappearing streams

  8. Glacial Environments • Glaciers – ice masses formed from the accumulation of snow • Move down slope due to weight • Transport sediment • May advance or retreat depending on climatic conditions

  9. Glacial Environments

  10. Glacial Deposits • Drift – deposits left behind after a glacier melts • Till – unstratified drift (no water transport) • Stratified drift (melt water transport)

  11. Types of Glaciers • Cirque glaciers – small, semicircular to triangular glaciers that form on the sides of mountains.

  12. Types of Glaciers • Valley glaciers – long glaciers that flow down stream valleys in the mountains. • Piedmont glaciers – mergers of two or more valley glaciers at the foot of a mountain range.

  13. Types of Glaciers • Ice sheets – vast ice mounds that cover large portions of a continent (i.e., Greenland or Antarctica).

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