Record details

Title
    Cross-borehole flow analysis to characterize fracture connections in the Melechov Granite, Bohemian-Moravian Highland, Czech Republic
Author
    Kobr, Miroslav
    Lukes, Joseph
    Mareš, Stanislav
    Paillet, Frederick L.
    Urik, Joseph
    Williams, John H.
Language
    anglicky
Publication type
    článek v periodiku
Source title - serial
    Hydrogeology Journal
Vol./nr.
    Roč. 20, č. 1
Pages
    12
Year
    2012
Thesaurus term
    analysis
    Bohemian-Moravian
    characterize
    connections
    Cross-borehole
    Czech
    flow
    fracture
    Granite
    Highland
    Melechov
    Republic
Keyword
    Analysis
    Bohemian-Moravian
    Characterize
    Connections
    Cross-borehole
    Czech
    Flow
    Fracture
    Granite
    Highland
    Melechov
    Republic
Abstract (in english)
   Application of the cross-borehole flow method, in which short pumping cycles in one borehole are used to induce time-transient flow in another borehole, demonstrated that a simple hydraulic model can characterize the fracture connections in the bedrock mass between the two boreholes. The analysis determines the properties of fracture connections rather than those of individual fractures intersecting a single borehole; the model contains a limited number of adjustable parameters so that any correlation between measured and simulated flow test data is significant. The test was conducted in two 200-m deep boreholes spaced 21m apart in the Melechov Granite in the Bohemian-Moravian Highland, Czech Republic. Transient flow was measured at depth stations between the identified transmissive fractures in one of the boreholes during short-term pumping and recovery periods in the other borehole. Simulated flows, based on simple model geometries, closely matched the measured flows. The relative tr
   ansmissivity and storage of the inferred fracture connections were corroborated by tracer testing. The results demonstrate that it is possible to assess the properties of a fracture flow network despite being restricted to making measurements in boreholes in which a local population of discrete fractures regulates the hydraulic communication with the larger-scale aquifer system.
Contributor
    UK Praha, Přírodovědecká fakulta
Contributor code
    UK, PřF
Source format
    R
Import date
    27. 4. 2014