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A Simple Modelling Framework for Shallow Subsurface Water Storage and Flow

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Author(s)

  • Lucile Verrot
  • Josie Geris
  • L Gao
  • X Peng
  • Joe Oyesiku-Blakemore
  • Jo Smith
  • Mark Edward Hodson
  • Ganlin Zhang
  • Paul Hallett

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Publication details

JournalWater
DateAccepted/In press - 14 Aug 2019
DatePublished (current) - 19 Aug 2019
Issue number8
Volume11
Number of pages20
Original languageEnglish

Abstract

Water storage and flow in shallow subsurface drives runoff generation, vegetation water use and nutrient cycling. Modelling these processes under non-steady state conditions is challenging, particularly in regions like the subtropics that experience extreme wet and dry periods. At the catchment-scale, physically-based equations (e.g., Richards equation) are impractical due to their complexity, while conceptual models typically rely on steady state assumptions not found in daily hydrological dynamics. We addressed this by developing a simple modelling framework for shallow subsurface water dynamics based on physical relationships and a proxy parameter for the fluxes induced by non-unit hydraulic gradients. We demonstrate its applicability for six generic soil textures and for an Acrisol in subtropical China. Results showed that our new approach represents top soil daily fluxes and storage better than, and as fast as, standard conceptual approaches. Moreover, it was less complex and up to two orders of magnitude faster than simulating Richards equation, making it easy to include in existing hydrological models.

Bibliographical note

©2019 by the authors.

    Research areas

  • hydrological modelling, soil water content, soil water fluxes, vadose zone, non-unit hydraulic gradient, transient state

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