EARTHSC 2GG3 Lecture Notes - Lecture 9: Mining, Ground-Penetrating Radar, Karst
15 Apr 2016
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Document Summary
The speed can vary from very slow to rapid. The subsiding area can be a variety of shapes. Not usually life-threatening, but is one of the most widespread and costly hazards. Associated with the dissoluion of limestone, marble or gypsum. Some rocks dissolve in the vicinity of water. Most evident in areas on limestone because this is most common of the dissolving rocks. Water containing co2 is acidic and thus aids in the dissoluion process. Limestone dissoluion can result in the lowering of a surface by 1cm per decade. The process produces empty voids over a range of sizes. At voids near the surface, sinkholes may develop. A surface containing many sinkholes is referred to as a karst pain. These can reach several hundred meters in diameter. 2 types: soluion (formed by acidic groundwater, collapse (formed by collapse of surface) A system of caves may evolve as limestone voids coninue to enlarge.
