Physics and Chemistry of Dissolution on Subaerialy Exposed Soluble Rocks by Flowing Water Films
作者: Wolfgang DreybrodtGeorg Kaufmann
作者单位: 1Institute of Experimental Physics, Karst Processes Research Group, University of Bremen, D-28334 Bremen
2Fachbereich Geowissenschaften,Fachrichtung Geophysik, Haus D, Freie Universitaet Berlin, Malteserstr. 74-100, D-12249 Berlin
刊名: Acta Carsologica, 2007, Vol.36 (3)
来源数据库: ZRC SAZU, Založba ZRC
DOI: 10.3986/ac.v36i3.169
原始语种摘要: The basic process active in the formation of subaerial features on karst rocks is chemical dissolution of limestone or gypsum by water films flowing on the rock surface. The dissolution rates of limestone and gypsum into thin films of water in laminar flow are given by F = α(ceq-c), where (ceq-c) is the difference of the actual concentration c in the water film and the equilibrium concentration ceq with respect to the corresponding mineral. Whereas for gypsum α is determined by molecular diffusion the situation is more complex for limestone. Experiments are presented, which show that for high undersaturation, c<0.3ceq, the rate law is F = α( 0.3ceq-c) ,and α becomes higher by about a factor of ten than for the rates at c>0.3ceq. These rate laws are used to calculate denudation rates on...

  • limestone 石灰岩
  • rates 地方税
  • corresponding 对应的
  • chemical 化学的
  • gypsum 石膏
  • higher 
  • concentration 浓度
  • given 已知的
  • dissolution 溶解
  • subaerial 陆上的