EARTHSC 2GG3 Lecture 9: Karst Lecture 1
8 Mar 2017
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Document Summary
Understand subsidence and soil and expansion and contraction, what causes them. Recognize links between subsidence and other hazards and natural services of karst. Understand how people interact with subsidence and soil hazards. Know what can be done to minimize risk of subsidence + soil expansion and contraction. Subsidence: slow or rapid vertical downward movement of earths surface. Karst: landscape resulting from dissolution of limestone, dolostone, rock salt, marble, gypsum. Common type of landscape associated with subsidence. Rocks are dissolved by surface water or groundwater. Dissolution produced voids which join to form caves and sinkholes. Surface pocksmarked with a large number of sinkholes is a karst plain. Can range from one to several hundred metres in diameter. 1: solution pits formed by dissolution of buried bedrock along plains and fracture. 2: collapse collapse of surface or near surface rocks or sediment cave systems formed when dissolution produces a series of caves related to fluctuating cave systems.
