Spatial Variability of Hydraulic Properties in a Multi-Layered Soil Profile

Mallants, Dirk; Mohanty, Binayak P.; Jacques, Diederik; Feyen, Jan

doi:10.1097/00010694-199603000-00003

Cited by 152 publications

(90 citation statements)

References 28 publications

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“…The measured heterogeneity for the unsaturated hydraulic conductivity was smaller than the values measured by Tuli et al (2001) and much smaller than the values for the saturated conductivity measured by Mallants et al (1996). Kelleners et al (1999) measured scaling factors with standard deviations about three times larger than those in our experiment.…”

Section: Scaled Values a Bcontrasting

confidence: 86%

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Scaling the Hydraulic Functions of A Water Repellent Sandy Soil

Stoffregen¹,

Wessolek²

2014

International Agrophysics

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A b s t r a c t. The heterogeneity of both unsaturated hydraulic conductivity and water retention was measured with a high spatial resolution on a transect using an evaporation method. Fifteen undisturbed 100 cm 3 soil cores were taken on a transect every 10 cm from the topsoil of a water repellent sandy site. Five dynamic water retention curves and four unsaturated conductivity curves were determined for each core. We conducted measurements without further saturation in the laboratory in order to achieve field-like conditions. The initial water contents were heterogeneous, indicating different hysteretic conditions and water repellent areas. The scattering of the water retention curves was high, while the heterogeneity of unsaturated conductivity curves was unexpectedly low. Two scaling approaches were used to describe the heterogeneity: one with and one without considering hysteresis. The concept of scaling applies well to describing the heterogeneity of both hydraulic functions. Including hysteresis leads to similar results than excluding hysteresis. The distribution of the hydraulic conductivity and the water retention were independent from each other. The results give important information for numerical simulation of the water flow with heterogeneous hydraulic functions.K e y w o r d s: scaling, hydraulic conductivity, water retention, hysteresis, water repellency

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Section: Scaled Values a Bcontrasting

confidence: 86%

“…When using a combined scaling approach, the estimation led to slightly better results. Mallants et al (1996) determined the spatial heterogeneity of water retention and saturated hydraulic conductivity. They found much higher heterogeneity of saturated conductivity.…”

Section: Introductionmentioning

confidence: 99%

Scaling the Hydraulic Functions of A Water Repellent Sandy Soil

Stoffregen¹,

Wessolek²

2014

International Agrophysics

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“…[38] Further, K s has been shown to exhibit greater spatial variability than , m, r , or s , with s and m possessing the least spatial variability [Mallants et al, 1996]. This signifies that for any single location, the denominator of equation (22) can be constrained using few soil samples relative to the number of infiltration tests.…”

Section: Application-determining Saturated Hydraulic Conductivity Fromentioning

confidence: 99%

Modeling effect of initial soil moisture on sorptivity and infiltration

et al. 2013

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[1] A soil's capillarity, associated with the parameter sorptivity, is a dominant control on infiltration, particularly at the onset of rainfall or irrigation. Many mathematical models used to estimate sorptivity are only valid for dry soils. This paper examines how sorptivity and its capillary component (as wetting front potential) change with initial degree of saturation. We capture these effects with a simple modification to the classic Green-Ampt model of sorptivity. The modified model has practical applications, including (1) accurately describing the relative sorptivity of a soil at various water contents and (2) allowing for quantification of a soil's saturated hydraulic conductivity from sorptivity measurements, given estimates of the soil's characteristic curve and initial water content. The latter application is particularly useful in soils of low permeability, where the time required to estimate hydraulic conductivity through steady-state methods can be impractical.

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“…em que * y (h)é a semivariância, N(h) é o número de pares separados pela distância h, e Z(x 1 ), Z(x 2 ), ..., Z(x n ) são os valores medidos em cada ponto x 1 , x 2 , ...x n (Souza, 1992;Mallants et al, 1996;Souza et al, 1997;Vieira, 2000).…”

Section: Materiais E Métodosunclassified

Avaliação de três áreas de solo construído após mineração de carvão a céu aberto em Lauro Müller, Santa Catarina

Campos

Almeida

Souza

2003

Rev. Bras. Ciênc. Solo

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RESUMOEm solos construídos após mineração de carvão, a contaminação das camadas superficiais com pirita provoca intensa acidificação do solo, acelera a intemperização de minerais, eleva os teores de Al e Mn e aumenta a lixiviação de bases. O presente trabalho avaliou características químicas, teor de argila e mineralogia, bem como a variabilidade espacial para algumas dessas características em três áreas de solos construídos após mineração de carvão a céu aberto no município de Lauro Müller, Santa Catarina. As três áreas selecionadas apresentavam diferenças no modo de construção topográfico. A primeira, denominada Mina Juliana (MJ), foi construída em 1996, utilizando material (sólum, regolito argiloso e rocha) que foi separado e estocado antes da mineração, conforme previsto no plano de reabilitação. A segunda, denominada Mina do Apertado (MA), foi construída, em 1996, usando, como material de cobertura, o sólum proveniente do decapeamento de um morro adjacente à área. A terceira área, denominada Mina Rio do Meio (MRM), sofreu apenas construção topográfica em 1983, com mistura de resíduos de pirita de carvão e rochas de várias camadas. Amostras de solo foram coletadas em sistema de grade de pontos, em três profundidades, sendo analisados o pH em água, teores de Ca, Mg, K e Al trocáveis, H + Al e condutividade elétrica. Em amostras selecionadas, analisaramse alguns metais pesados e a mineralogia da fração argila. Análises efetuadas em dois perfis de solo representativos das condições anteriores à mineração foram utilizados, para comparação. Todas as áreas apresentaram grande dispersão de valores para características químicas e teor de argila dos solos entre os pontos amostrados. O processo de construção do solo que resultou em maior uniformidade destas características e melhores condições para o estabelecimento de espécies vegetais foi o da área MJ. O solo da área MA, graças

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Spatial Variability of Hydraulic Properties in a Multi-Layered Soil Profile

Cited by 152 publications

References 28 publications

Scaling the Hydraulic Functions of A Water Repellent Sandy Soil

Scaling the Hydraulic Functions of A Water Repellent Sandy Soil

Modeling effect of initial soil moisture on sorptivity and infiltration

Avaliação de três áreas de solo construído após mineração de carvão a céu aberto em Lauro Müller, Santa Catarina

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