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An explicit hydrological algorithm for basic flow and transport equations and its application in agro-hydrological models for water and nitrogen dynamics

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Zhang, Kefeng, Zhang, Tuqiao and Yang, D. (Dejun). (2010) An explicit hydrological algorithm for basic flow and transport equations and its application in agro-hydrological models for water and nitrogen dynamics. Agricultural Water Management, Vol.98 (No.1). pp. 114-123. ISSN 0378-3774

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Official URL: http://dx.doi.org/10.1016/j.agwat.2010.08.004

Abstract

Hydrological simulation is a key component in argo-hydrological models for optimizing resources use and minimizing the environmental consequences in agriculture. In this study we extended a simple and explicit algorithm for solving the basic soil water flow equation by Yang et al. (J. Hydrol. 370, 177-190) to the solute transport equation. The key feature of the algorithm is to use a uniform soil layer thickness and a small time step in solving the soil water and solute transport equations, so that the calculations can be made on a layer basis. This drastically simplifies the procedure of modeling water and solute transport in soil using the basic equations. The proposed algorithm was tested against the complex finite element (FE) numerical scheme in simulating soil water and solute transport in different soils via numerical experiments. The results showed that the proposed algorithm with a uniform soil layer thickness of 5 cm and a small time step of 0.001d was able to achieve the identical accuracy as the FE method. Tests of the proposed algorithm in simulating water and nitrogen dynamics against data from a field experiment on wheat revealed that the predicted results with the simple algorithm were in good agreement with the time-course measurements of soil water and mineral N concentration at the various depths in the profile, suggesting that the proposed algorithm performed well and can be reliably applied in agro-hydrological models. The simplicity and accuracy of the algorithm will encourage scientists to use basic equations for soil water and solute transport more in the future for improving performance of agro-hydrological models.

Item Type:	Journal Article
Subjects:	S Agriculture > SB Plant culture
Divisions:	Faculty of Science > Life Sciences (2010- ) Faculty of Science > Life Sciences (2010- ) > Warwick HRI (2004-2010)
Library of Congress Subject Headings (LCSH):	Hydrologic models, Soil moisture -- Mathematical models, Soils -- Solute movement -- Mathematical models, Soils -- Transport properties
Journal or Publication Title:	Agricultural Water Management
Publisher:	Elsevier BV
ISSN:	0378-3774
Date:	1 December 2010
Volume:	Vol.98
Number:	No.1
Page Range:	pp. 114-123
Identification Number:	10.1016/j.agwat.2010.08.004
Status:	Peer Reviewed
Access rights to Published version:	Open Access
Funder:	Great Britain. Dept. for Environment, Food & Rural Affairs (DEFRA)
Grant number:	HH3509SFV (DEFRA)
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URI:	http://wrap.warwick.ac.uk/id/eprint/4443