Spatial trends in saturated hydraulic conductivity of vegetated dunes in the Nebraska Sand Hills: Effects of depth and topography

Wang, Zhihui; Zlotnik, Vitaly A.; Wedin, David A.; Wally, Kathryn D.

doi:10.1016/j.jhydrol.2007.10.027

Cited by 44 publications

(38 citation statements)

References 31 publications

(29 reference statements)

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“…Vegetation type is assumed to be grass in all models (specifically C3 grass in IBIS), and we use a uniform root distribution that is 50 cm deep (based on previously reported root depths in grasslands studies such as Jackson et al, 1996 andWang et al, 2008). Simulated soil moisture outputs for the Hydrus-1D and IBIS models are obtained at 10, 20, and 50 cm below the soil surface, which is consistent with the field observations.…”

Section: Model Evaluation Using Field Observationssupporting

confidence: 56%

Quantifying the impact of groundwater depth on evapotranspiration in a semi-arid grassland region

Soylu

Istanbulluoglu

Lenters

et al. 2011

Hydrol. Earth Syst. Sci.

114

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Abstract.Interactions between shallow groundwater and land surface processes play an important role in the ecohydrology of riparian zones. Some recent land surface models (LSMs) incorporate groundwater-land surface interactions using parameterizations at varying levels of detail. In this paper, we examine the sensitivity of land surface evapotranspiration (ET) to water table depth, soil texture, and two commonly used soil hydraulic parameter datasets using four models with varying levels of complexity. The selected models are Hydrus-1D, which solves the pressure-based Richards equation, the Integrated Biosphere Simulator (IBIS), which simulates interactions among multiple soil layers using a (water-content) variant of the Richards equation, and two forms of a steady-state capillary flux model coupled with a single-bucket soil moisture model. These models are first evaluated using field observations of climate, soil moisture, and groundwater levels at a semi-arid site in south-central Nebraska, USA. All four models are found to compare reasonably well with observations, particularly when the effects of groundwater are included. We then examine the sensitivity of modelled ET to water table depth for various model formulations, node spacings, and soil textures (using soil hydraulic parameter values from two different sources, namely Rawls and Clapp-Hornberger). The results indicate a strong influence of soil texture and water table depth on groundwater contributions to ET. Furthermore, differences in texturespecific, class-averaged soil parameters obtained from the two literature sources lead to large differences in the simulated depth and thickness of the "critical zone" (i.e., the zone within which variations in water table depth strongly Correspondence to: M. E. Soylu (evren@huskers.unl.edu) impact surface ET). Depending on the depth-to-groundwater, this can also lead to large discrepancies in simulated ET (in some cases by more than a factor of two). When the Clapp-Hornberger soil parameter dataset is used, the critical zone becomes significantly deeper, and surface ET rates become much higher, resulting in a stronger influence of deep groundwater on the land surface energy and water balance. In general, we find that the simulated sensitivity of ET to the choice of soil hydraulic parameter dataset is greater than the sensitivity to soil texture defined within each dataset, or even to the choice of model formulation. Thus, our findings underscore the need for future modelling and field-based studies to improve the predictability of groundwater-land surface interactions in numerical models, particularly as it relates to the parameterization of soil hydraulic properties.

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Section: Model Evaluation Using Field Observationssupporting

confidence: 56%

Quantifying the impact of groundwater depth on evapotranspiration in a semi-arid grassland region

Soylu

Istanbulluoglu

Lenters

et al. 2011

Hydrol. Earth Syst. Sci.

114

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“…The river valleys in general show up as low net recharge areas (the linear features in Figs. 4 and 7), because the water table is typically closer to the surface here than elsewhere, away from the valleys, enabling the vegetation to use additional water (Wang et al 2007;Maxwell and Kollet 2008).…”

Section: Spatial Distribution Of Recharge Ratesmentioning

confidence: 99%

Mapping mean annual groundwater recharge in the Nebraska Sand Hills, USA

et al. 2011

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[2000][2001][2002][2003][2004][2005][2006][2007][2008][2009] period was estimated at a 1-km spatial resolution as the difference of mean annual precipitation (P) and evapotranspiration (ET). Monthly P values came from the PRISM dataset, while monthly ET values were derived from linear transformations of the MODIS daytime land-surface temperature values into pixel ET rates with the help of ancillary atmospheric data (air temperature, humidity, and global radiation). The study area receives about 73 mm of recharge (with an error bound of ±73 mm) annually, which is about 14 ± 14% of the regional mean annual P value of 533 mm. The largest recharge rates (about 200 ± 85 mm or 30 ± 12% of P) occur in the south-eastern part of the Sand Hills due to smoother terrain and more abundant precipitation (around 700 mm), while recharge is the smallest (about 40 ± 59 mm or 10 ± 14% of P) in the western part, where annual precipitation is only about 420 mm. Typically, lakes, wetlands, wet inter-dunal valleys, rivers, irrigated crops (except in the south-eastern region) and certain parts of afforested areas in the south-central portion of the study area act as discharge areas for groundwater.

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“…Os solos arenosos apresentam menor quantidade de cargas, maior macroporosidade e condutividade hidráulica saturada, menor microporosidade e menor retenção de água (Ceballos et al, 2002;Weber et al, 2007;Wang et al, 2008).…”

Section: Introductionunclassified

Atributos Físicos, Macro e Micromorfológicos de Neossolos Regolíticos no Agreste Meridional de Pernambuco

Almeida

Corrêa

Lima

et al. 2015

Rev. Bras. Ciênc. Solo

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reSumO neossolos regolíticos no agreste meridional de pernambuco são utilizados para diversas atividades agrícolas, com destaque para a produção de feijão. Há uma variação expressiva na produção dessa cultura, possivelmente associada à presença de lamelas, que conferem comportamento hídrico distinto entre esses solos. Objetivou-se analisar as características macromorfológicas, micromorfológicas e físicas de neossolos regolíticos localizados no Agreste Meridional de Pernambuco, com a finalidade de se entender o comportamento hídrico desses solos. Foram coletados e analisados dois perfis de solos localizados nos municípios de paranatama (p1 -sem lamela) e de São João (p2 -com lamela). Os resultados mostraram que nos atributos morfológicos (cor, textura, estrutura e consistência) não foram observadas diferenças expressivas entre os dois perfis de solos; os atributos físicos (teor de argila, macroporosidade, microporosidade, capacidade de campo e ponto de murcha permanente) apresentaram diferença significativa entre os horizontes dos perfis estudados; a micromorfologia indicou que a maior retenção de água no p2 é consequência da presença de zonas com empacotamento mais denso de seus componentes (empacotamento aglomerático) e expressividade das pontes de argila; e sugere-se adoção do termo "lamélico" pelo atual Recebido para publicação em 1 de dezembro de 2014 e aprovado em 26 de junho de 2015.

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Spatial trends in saturated hydraulic conductivity of vegetated dunes in the Nebraska Sand Hills: Effects of depth and topography

Cited by 44 publications

References 31 publications

Quantifying the impact of groundwater depth on evapotranspiration in a semi-arid grassland region

Quantifying the impact of groundwater depth on evapotranspiration in a semi-arid grassland region

Mapping mean annual groundwater recharge in the Nebraska Sand Hills, USA

Atributos Físicos, Macro e Micromorfológicos de Neossolos Regolíticos no Agreste Meridional de Pernambuco

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