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The effect of hydrochemical factors on the dissolution rate of gypsiferous rocks in flowing water
Author(s) -
Navas Ana
Publication year - 1990
Publication title -
earth surface processes and landforms
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.294
H-Index - 127
eISSN - 1096-9837
pISSN - 0197-9337
DOI - 10.1002/esp.3290150805
Subject(s) - gypsum , dissolution , geology , saturation (graph theory) , mineralogy , hydraulic conductivity , weathering , volumetric flow rate , electrical resistivity and conductivity , geomorphology , soil science , soil water , chemistry , paleontology , physics , mathematics , engineering , combinatorics , quantum mechanics , electrical engineering
In order to investigate the rate of dissolution of gypsiferous rocks under natural conditions in streams of the Ebro river basin, 55 dissolution trials were carried out with spheres of alabastrine gypsum placed in flowing water. Experimental conditions involved flow velocities between 0·3 and 1·2 m s −1 , electrical conductivities between 0·3 and 1·9 dS m −1 , and the saturation indices of gypsum between −2·1 and −0·33. Mean values of dissolution rate obtained vary from 104 to 226 gm −2 h −1 . This loss of mass corresponded to a volume of gypsum of between 393 and 853mmm −2 year −1 . The factors most affecting the dissolution of gypsum are in descending order of importance: flow velocity > electrical conductivity > gypsum saturation.