Derivation of effective hydraulic parameters of a karst aquifer from discharge hydrograph analysis

  • Baedke S
  • Krothe N
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Abstract

In well-developedka rstt errains,t hree or more distinctp ortionso f the karst continuumc anb e identifiedf rom hydrographosf springsis suingfr om the karsta quifer. Hydrographsfr om two karst springsw ithin the samed rainageb asina t the Crane Naval SurfaceW arfare Center,I ndiana,h aveb een analyzeda, nd ratioso f transmissivitayn d specifiyci eld( T/Sy) haveb eene stablishefodr the conduiat ndd iffusefl ows ystemTsh. ese ratiosh aveb een comparedw ith valueso f T derivedf rom aquifert ests,s o that independevnat lueso f Syc anb e calculatefdo r the diffuses ystemS.i milarlyif, thev alueo f Syi s assumetdo be 1.0f or a purec onduitt,h eni ndependenvta lueso f T canb e calculatefodr thise nd-memboefr t hek arstc ontinuumTh. ev alueso f T andS yd erived from this study are similar to values obtained from a dye trace of the conduit-dominated flow systema nd of valuesd erivedf rom aquifert estso f the diffusef low systemV. alueso f T for the conduits ystemo f theses pringsm ay need to be establisheda t a local scale,w hile the valuesf or the diffusef low systemm ayb e applicablea t a regionals caleA. hydrograph separationu singi sotopicd ata suggesttsh at the intermediate-flowsy stemr epresentsa mix of waterf rom the conduita nd diffusef low systemsIf. thisp ortiono f the hydrographis a trulym ixingp henomenraa,t ioso f T/Syc annobt e determinefdro mt heh ydrograph analysips resentedh erein.H owever,i f insteadt,h e intermediate-flowsy stemre presents waterr eleasefdro ma thirdr eservo(isr ucha ss malflr acturesr)a, tioso f T/Syc anb e establishedfo r the intermediate-flows ystem.

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Authors

  • S. J. Baedke

  • N. C. Krothe

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