Transient water-table recession in drained lands modeled using HYDRUS and compared with theoretical analyses assuming a succession of momentarily steady states

E. G. Youngs, S. A. Al Jabri

Research output: Contribution to journalArticle

Abstract

The transient water-table recession in lands drained by parallel lines of ditches extending down to a horizontal floor was numerically modeled for sand and silty clay when the ditch-water level was dropped from an initial equilibrium level to zero. For initially surface-ponded conditions, numerical results agreed well with analytical recessions that assumed the water table behaved as a succession of momentarily steady states and the specific yield to be that for equilibrium soil-water profiles above the water table. They also agreed for sand, but agreed less for silty clay when the initial water table was at depth. The agreement found between the modeled and analytical results for this simple situation gives confidence in the use of similar analyses in modeling the water-table movement in drained lands subject to more complicated hydrological conditions.

Original languageEnglish
Article number04017054
JournalJournal of Irrigation and Drainage Engineering
Volume144
Issue number1
DOIs
Publication statusPublished - Jan 1 2018

Fingerprint

Groundwater
water table
silty clay
Water
clay
sand
Clay
Water Movements
Sand
Water levels
surface water level
water level
Soil
soil water
land
Soils
modeling
ditch

Keywords

  • Analytical solutions
  • Analytical techniques
  • Drainage
  • HYDRUS modeling
  • Modeling
  • Non-steady-state ditch drainage
  • Theories
  • Water table
  • Water-table recession

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Water Science and Technology
  • Agricultural and Biological Sciences (miscellaneous)

Cite this

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title = "Transient water-table recession in drained lands modeled using HYDRUS and compared with theoretical analyses assuming a succession of momentarily steady states",
abstract = "The transient water-table recession in lands drained by parallel lines of ditches extending down to a horizontal floor was numerically modeled for sand and silty clay when the ditch-water level was dropped from an initial equilibrium level to zero. For initially surface-ponded conditions, numerical results agreed well with analytical recessions that assumed the water table behaved as a succession of momentarily steady states and the specific yield to be that for equilibrium soil-water profiles above the water table. They also agreed for sand, but agreed less for silty clay when the initial water table was at depth. The agreement found between the modeled and analytical results for this simple situation gives confidence in the use of similar analyses in modeling the water-table movement in drained lands subject to more complicated hydrological conditions.",
keywords = "Analytical solutions, Analytical techniques, Drainage, HYDRUS modeling, Modeling, Non-steady-state ditch drainage, Theories, Water table, Water-table recession",
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N2 - The transient water-table recession in lands drained by parallel lines of ditches extending down to a horizontal floor was numerically modeled for sand and silty clay when the ditch-water level was dropped from an initial equilibrium level to zero. For initially surface-ponded conditions, numerical results agreed well with analytical recessions that assumed the water table behaved as a succession of momentarily steady states and the specific yield to be that for equilibrium soil-water profiles above the water table. They also agreed for sand, but agreed less for silty clay when the initial water table was at depth. The agreement found between the modeled and analytical results for this simple situation gives confidence in the use of similar analyses in modeling the water-table movement in drained lands subject to more complicated hydrological conditions.

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