By Jirí Krásný, John M. Sharp
Comprising forty four chapters by means of authors from 22 international locations, this publication makes a speciality of the hydrogeology of fractured environments. This compendium discusses the major concerns, methodologies, and strategies within the box of hydrogeology of fractured (hard) rocks, summarizing effects completed lately in addition to stimulating rules and concerns on destiny investigations had to strengthen our figuring out of those important usual structures. It covers hydrogeologic surroundings of fractured rocks; conceptual versions, groundwater move, and assets in fractured rocks; groundwater caliber in fractured rocks; research and interpretation equipment; anthropogenic affects; and numerical modelling.
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Extra info for Groundwater in Fractured Rocks
Transmissivity data can be graphically represented in a probability paper by cumulative relative frequencies of transmissivity values (Figure 3). Thus, the comparative parameter expression of transmissivity, the index of transmissivity Y, can be used with advantage. To classify rock transmissivity, Krásny´ (1993a) presents a classification system of magnitude and variation. 1 m2/day) that indicate potential groundwater yields in different environments. Another important property of these data is their variation.
Therefore, despite irregular local permeability/transmissivity changes usually scattered in a wide interval of several orders of magnitude, regionally prevailing values – transmissivity background encompasses the most frequent transmissivity values in units m2/d up to slightly more than 10 m2/d. Comparison of regional prevailing transmissivity indicates only small differences in distinct hardrock areas. Therefore, except for certain rock types, influence of petrography on permeability and transmissivity spatial distribution is not significant because fracture distributions control the hydrogeology.
Regional trends in transmissivity in some crystalline areas are reported in Norway (Rohr-Torp, 1994) and the Czech Republic (Krásny´, 1996c) that reflect distinct intensity of neotectonic activities caused in Norway by isostatic uplift after Quaternary glacial retreat and in the Bohemian Massif by tectonic stress due to Alpine-Carpathian folding (Figure 2d). Fractured environments are intricate hierarchic systems consisting of inhomogeneities on local, sub-regional, and regional scales and hydraulic parameters differing with different scale.