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Simulation modelling of variable patterns of water movement through a cracking clay soil

Bradley, C ; Mosugu, M.E ; Gerrard, A.J

Soil use and management, 2005-12, Vol.21 (4), p.386-395 [Periódico revisado por pares]

Oxford, UK: Blackwell Publishing Ltd

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Título:
Simulation modelling of variable patterns of water movement through a cracking clay soil
Autor: Bradley, C ; Mosugu, M.E ; Gerrard, A.J
Assuntos: Agronomy. Soil science and plant productions ; Biological and medical sciences ; clay ; clay soils ; Cracking ; drainage ; Earth sciences ; Earth, ocean, space ; equations ; Exact sciences and technology ; Fundamental and applied biological sciences. Psychology ; Hydrogeology ; Hydrology. Hydrogeology ; macropore flow ; mathematical models ; Physical properties ; Physics, chemistry, biochemistry and biology of agricultural and forest soils ; prediction ; rain ; simulation ; simulation models ; soil ; soil hydraulic properties ; soil matric potential ; Soil science ; soil water content ; soil water movement ; spatial variation ; temporal variation ; Water and solute dynamics ; water flow ; water movement
É parte de: Soil use and management, 2005-12, Vol.21 (4), p.386-395
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ArticleID:SUM386
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Descrição: This paper describes the development and application of a simple empirical model describing differences in water movement through a cracking clay soil at Brimstone Farm, Wiltshire, UK. An extended data set comprising readings of soil water tension has been collected from an area of 9 m2 instrumented with 4 nests each of 3 tensiometers. The cracks are responsible for considerable differences both in water pathway and flow magnitude. Variations in water flow suggested by changes in soil-water tension are described by a model developed using 'ModelMaker' and applied separately to each profile nest. The model envisages water flow to occur through three soil layers, and to be partitioned into matrix and macropore flow components. Water is lost via drainage to clay tile drains at 60 cm depth. Water flow between layers is described as a function of the hydraulic gradient using Darcy's Law, with additional drainage from structural voids within the soil. Differences in the effective hydraulic conductivity describing slow and rapid flow components equate to macro and matrix flow for each tensiometer profile. The results illustrate heterogeneous patterns of flow through a soil block and demonstrate that a comparatively simple model is able to represent satisfactorily water flow dynamics through a cracking clay soil.
Editor: Oxford, UK: Blackwell Publishing Ltd
Idioma: Inglês

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Simulation modelling of variable patterns of water movement through a cracking clay soil

Bradley, C ; Mosugu, M.E ; Gerrard, A.J

Oxford, UK: Blackwell Publishing Ltd

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