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Estimating recharge rates with analytic element models and parameter estimation.
Dripps, W R; Hunt, R J; Anderson, M P.
Afiliación
  • Dripps WR; Department of Earth and Geographic Sciences, University of Massachusetts, Boston, MA 02125, USA. weston.dripps@umb.edu
Ground Water ; 44(1): 47-55, 2006.
Article en En | MEDLINE | ID: mdl-16405465
ABSTRACT
Quantifying the spatial and temporal distribution of recharge is usually a prerequisite for effective ground water flow modeling. In this study, an analytic element (AE) code (GFLOW) was used with a nonlinear parameter estimation code (UCODE) to quantify the spatial and temporal distribution of recharge using measured base flows as calibration targets. The ease and flexibility of AE model construction and evaluation make this approach well suited for recharge estimation. An AE flow model of an undeveloped watershed in northern Wisconsin was optimized to match median annual base flows at four stream gages for 1996 to 2000 to demonstrate the approach. Initial optimizations that assumed a constant distributed recharge rate provided good matches (within 5%) to most of the annual base flow estimates, but discrepancies of >12% at certain gages suggested that a single value of recharge for the entire watershed is inappropriate. Subsequent optimizations that allowed for spatially distributed recharge zones based on the distribution of vegetation types improved the fit and confirmed that vegetation can influence spatial recharge variability in this watershed. Temporally, the annual recharge values varied >2.5-fold between 1996 and 2000 during which there was an observed 1.7-fold difference in annual precipitation, underscoring the influence of nonclimatic factors on interannual recharge variability for regional flow modeling. The final recharge values compared favorably with more labor-intensive field measurements of recharge and results from studies, supporting the utility of using linked AE-parameter estimation codes for recharge estimation.
Asunto(s)
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Colección: 01-internacional Banco de datos: MEDLINE Asunto principal: Movimientos del Agua / Abastecimiento de Agua / Monitoreo del Ambiente / Análisis de Elementos Finitos / Modelos Químicos Tipo de estudio: Prognostic_studies País/Región como asunto: America do norte Idioma: En Revista: Ground Water Asunto de la revista: SAUDE AMBIENTAL / TOXICOLOGIA Año: 2006 Tipo del documento: Article País de afiliación: Estados Unidos
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Colección: 01-internacional Banco de datos: MEDLINE Asunto principal: Movimientos del Agua / Abastecimiento de Agua / Monitoreo del Ambiente / Análisis de Elementos Finitos / Modelos Químicos Tipo de estudio: Prognostic_studies País/Región como asunto: America do norte Idioma: En Revista: Ground Water Asunto de la revista: SAUDE AMBIENTAL / TOXICOLOGIA Año: 2006 Tipo del documento: Article País de afiliación: Estados Unidos