Quantifying ephemeral streambed infiltration from downhole temperature measurements collected before and after streamflow

Charles E.V. Dowman, Ty P.A. Ferré, John P. Hoffmann, Dale F. Rucker, James B. Callegary

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

A constant flux infiltration experiment was conducted to determine the feasibility of using down hole temperature measurements to estimate infiltration flux. Temperatures measured using a down hole thermistor with in a 15.4-m-deep borehole compare well with temperatures measured with buried thermocouples in an adjacent borehole to 5 m depth. Numerical forward model simulations were conducted using VS2DI. A numerical sensitivity analysis showed that the temperature profile was most sensitive to the average temperature of the infiltrating water, the infiltration flux, and the specific heat capacity of dry soil. The high sensitivity of these variables allows for a simple sequential optimization to be used to estimate the average temperature of the infiltrating water, the water flux, and the specific heat capacity of dry soil from numerical inversion of temperature measurements. Down hole temperature measurements could be a useful complement to shallow streambed temperature methods, allowing for better quantification of the contribution of streambed infiltration to basin-scale recharge.

Original languageEnglish (US)
Pages (from-to)595-601
Number of pages7
JournalVadose Zone Journal
Volume2
Issue number4
DOIs
StatePublished - Nov 2003

ASJC Scopus subject areas

  • Soil Science

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