Simulating groundwater uptake and hydraulic redistribution by phreatophytes in a high-resolution, coupled subsurface-land surface model

Si Gou, Gretchen R. Miller, Cody Saville, Reed M. Maxwell, Ian M. Ferguson

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Several new functions representing groundwater dependent vegetation were incorporated into a coupled subsurface-land surface model, ParFlow.CLM, in order to adequately describe groundwater water uptake, hydraulic redistribution, and plant water stress. The modified model was used to conduct three-dimensional, stand-scale simulations of a Mediterranean oak savanna in California. It performed well and captured daily, hourly and spatial water and energy dynamics, as well as groundwater evapotranspiration rates. The new model was then compared to various approaches, the original ParFlow.CLM and a version using a root water uptake compensation equation. During the dry season, the modified model closely predicted the measured transpiration rate while the original model predicted that it would become zero and the compensation approach overestimated it by nearly double. The modified model also allowed for analysis of several key ecohydrological processes, namely the hydraulic redistribution when plants were both active and dormant, the leaf water potential, and xylem cavitation.

Original languageEnglish (US)
Pages (from-to)245-262
Number of pages18
JournalAdvances in Water Resources
Volume121
DOIs
StatePublished - Nov 2018
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Water Science and Technology

Keywords

  • Groundwater dependent vegetation
  • Groundwater modeling
  • Groundwater-soil-plant-atmosphere continuum
  • Hydraulic redistribution
  • Land surface modeling
  • Upland phreatophyte

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