Effect of hysteresis on water flow in the vadose zone under natural boundary conditions, Siloam Village case study, South Africa | Zendy

Ivo A. Arrey | Zendy; John O. Odiyo | Zendy; Rachel Makungo | Zendy; Milton Obote Kataka | Zendy

Open Access

Effect of hysteresis on water flow in the vadose zone under natural boundary conditions, Siloam Village case study, South Africa

Author(s) -

Ivo A. Arrey,

John O. Odiyo,

Rachel Makungo,

Milton Obote Kataka

Publication year - 2017

Publication title -

journal of hydroinformatics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.654

H-Index - 50

eISSN - 1465-1734

pISSN - 1464-7141

DOI - 10.2166/hydro.2017.091

Subject(s) - vadose zone , soil water , geology , hydrology (agriculture) , soil science , richards equation , hysteresis , environmental science , geotechnical engineering , geomorphology , physics , quantum mechanics

A one-dimensional vadose zone model was used to simulate flow under natural boundary conditions. The effects of hysteresis, and temporal variability of meteorological conditions were evaluated. Simulations were performed in HYDRUS-1D code for the period April 2013-January 2014 (6601 hours) at three different locations in a delineated portion of the sub-quaternary catchment A80A of Nzhelele with different soil textures. Soil hydraulic characteristics were estimated in a Rosetta library dynamically linked to the HYDRUS-1D model which is based on the numerical solution of a one-dimensional Richard9s equation. Analysis of the simulation results suggests that ignoring hysteresis for soils of similar textural class does not lead to any significant deviation of the model predicted soil moisture, unlike for soils with different textural classes.

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