GEOS 1034 Lecture Notes - Lecture 8: Thermosiphon, Liquid Crystal, Quick Clay
18 Aug 2016
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Document Summary
Vertical change in the land surface: little to no horizontal motion. Contains caves and sinkholes from carbonate rock dissolution. Rain water + carbon dioxide = carbonic acid in water: carbonic acid reacts with limestone to form calcium bicarbonate. Limestone is filled with holes filled with water. Creates caverns: stalactite: falling, stalagmite: rising. Collapse can be rapid and with little warning. For residential use in sf bay area, ca. Once a layer has been deflated, it cannot be reinflated: artificial recharge can slow or stabilize. Long beach, ca: removal of oil caused land to sink. Draining nearshore wetlands for agriculture or development. Groundwater withdrawal subsidence in the us occurs primarily in states like texas, Subsidence causes: thaw subsoils in arctic regions are permanently frozen: permafrost. Swelling causes expansive soils contain materials that readily absorb water smectic clays. Problems develop when dry soils absorb water: or wet soils dry out.
