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Aggregation scenarios to model water fluxes in watersheds with spatial changes in soil texture

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dc.contributor.authorSoria, Jose M., author
dc.contributor.authorLeij, Feike J., author
dc.contributor.authorAngulo-Jaramillo, Rafael, author
dc.contributor.authorFuentes, Carlos, author
dc.contributor.authorHaverkamp, Randel, author
dc.contributor.authorParlange, J.-Yves, author
dc.contributor.authorColorado State University, publisher
dc.date.accessioned2020-01-29T15:32:02Z
dc.date.available2020-01-29T15:32:02Z
dc.date.issued2003
dc.descriptionIncludes bibliographical references.
dc.description23rd annual AGU hydrology days was held on March 31 - April 2, 2003 at Colorado State University.
dc.description.abstractAccurate knowledge of water fluxes in the vadose zone of watersheds is important for applications such as water resources management and climate forecasting. Most, if not all, largescale studies follow a pragmatic approach where simplifying assumptions have to be made regarding problem formulation and estimation of hydraulic properties. This study investigates simplifications in both regards to predict infiltration and evaporation fluxes near or at the surface for a generic, rectangular watershed consisting of sand and silt loam columns. The two-dimensional flow problem (reference scenario) as well as simplifying 1-D problems are solved with the finite-element method (FEM) for 1, 10, 100, and 1000 m widths of the flow domain and different proportions of the sand and silt loam soils. The hydraulic functions are estimated from soil texture. In the simplifying scenarios, the flow domain is either represented as an equivalent soil using a weighted particle-size distribution as previously applied in physico-empirical predictions of hydraulic properties (a priori aggregation) or as two parallel stream tubes with area-weighted contributions to the total flux (a posteriori aggregation). Substantial differences were found between the fluxes based on the "equivalent" and reference scenarios even though our approach was based on a most favorable situation where only a limited number of texturedependent hydraulic parameters were different. The "stream tube" scenario typically provided a good description of the flux according to the reference scenario except for infiltration in case of domains less than 10 m wide. No pronounced textural differences are likely to occur over such small distances and the stream tube model appears to be a viable method to describe near-surface fluxes in catchments with a spatially variable soil texture.
dc.format.mediumborn digital
dc.format.mediumproceedings (reports)
dc.identifier.urihttps://hdl.handle.net/10217/200000
dc.identifier.urihttp://dx.doi.org/10.25675/10217/200000
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relation.ispartofHydrology Days
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.titleAggregation scenarios to model water fluxes in watersheds with spatial changes in soil texture
dc.title.alternativeHydrology days 2003
dc.title.alternativeAGU hydrology days 2003
dc.typeText

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