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Stable Isotopic Variation of Storm Discharge from a Perennial Karst Spring, Indiana
Author(s) -
Lakey Barbara,
Krothe Noel C.
Publication year - 1996
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/95wr01951
Subject(s) - groundwater recharge , hydrology (agriculture) , hydrograph , karst , vadose zone , spring (device) , rainwater harvesting , aquifer , groundwater , geology , storm , environmental science , groundwater discharge , surface runoff , oceanography , geotechnical engineering , mechanical engineering , ecology , paleontology , engineering , biology
Oxygen and deuterium isotopes and major‐ion chemistry of water from a large karst spring were used in an attempt to decipher water recharge, transmission, and storage characteristics of a karst aquifer system. Ionic concentrations and isotopic data indicated that the bulk of discharge during peak flow was derived from groundwater storage. Isotopic hydrograph separation of storm flow revealed that maximum rainwater contribution to discharge was 18 to 24 hours after peak flow and rainwater contributed 20 to 25% of spring discharge over the monitoring periods. Water released from phreatic and vadose conduit storage may have contributed to discharge with the onset of storm flow, while water from soil moisture and epikarst storage may have arrived during initial discharge recession.