Bedrock Infiltration and Mountain Block Recharge Accounting Using Chloride Mass Balance

Pam Aishlin, James P. McNamara

Research output: Contribution to journalArticlepeer-review

61 Scopus citations

Abstract

Mountain front catchment net groundwater recharge (NR) represents the upper end of mountain block recharge (MBR) groundwater flow paths. Using environmental chloride in precipitation, streamflow and groundwater, we apply chloride mass balance (CMB) to estimate NR at multiple catchment scales within the 27 km 2 Dry Creek Experimental Watershed (DCEW) on the Boise Front, southwestern Idaho. The estimate for average annual precipitation partitioning to NR is approximately 14% for DCEW. In contrast, as much as 44% of annual precipitation routes to NR in ephemeral headwater catchments. NR in headwater catchments is likely routed to downgradient springs, baseflow, and MBR, while downgradient streamflow losses contribute further to MBR. A key assumption in the CMB approach is that the change in stored chloride during the study period is zero. We found that this assumption is violated in some individual years, but that a 5-year integration period is sufficient.

Original languageAmerican English
Pages (from-to)1934-1948
Number of pages15
JournalHydrological Processes
Volume25
Issue number12
DOIs
StatePublished - 15 Jun 2011

Keywords

  • Bedrock infiltration
  • Catchment hydrology
  • Chloride mass balance
  • Groundwater recharge
  • Mountain block recharge
  • Water balance

EGS Disciplines

  • Earth Sciences
  • Geophysics and Seismology

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