Soil surface-seal measurement using high-resolution x-ray computed tomography (HRCT)

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Soil surface-seal measurement using high-resolution x-ray computed tomography (HRCT)

Please use this identifier to cite or link to this item: http://hdl.handle.net/10355/4507

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dc.contributor.advisor Gantzer, Clark James en
dc.contributor.author Lee, Sang Soo, 1978- en_US
dc.date.accessioned 2010-01-12T17:46:59Z
dc.date.available 2010-01-12T17:46:59Z
dc.date.issued 2006 en_US
dc.date.submitted 2006 Fall en
dc.identifier.other LeeS-120706-T6024 en_US
dc.identifier.uri http://hdl.handle.net/10355/4507
dc.description The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. en_US
dc.description Title from title screen of research.pdf file (viewed on August 24, 2007) en_US
dc.description Vita. en_US
dc.description Includes bibliographical references. en_US
dc.description Thesis (M.S.) University of Missouri-Columbia 2006. en_US
dc.description Dissertations, Academic -- University of Missouri--Columbia -- Soil, environmental and atmospheric sciences. en_US
dc.description.abstract Rainfall on bare soil breaks soil aggregates, detaching particles, plugging pores and decreasing porosity in the top few mm of soil. This reduces hydraulic conductivity and increases runoff through a process known as surface sealing. The objectives of this study are to measure saturated hydraulic conductivity (Ksat) of surface seals developed on bare Mexico silt loam (Aeric Vertic Epiaqualfs) during a simulated rainfall event, to evaluate the effect of anionic polyacrylamide (PAM) for maintaining high Ksat, and to evaluate models of sealing using total porosity, pore-size distribution collected with high-resolution X-ray computed tomography (HRCT). The study used a factorial design. Factors included rainfall duration (0-, 7.5-, 15-, 30-, and 60-min) at 55-mm hr-1 intensity, and an untreated soil or a soil amended with 20-kg ha-1 PAM. Application of PAM for various rainfall durations maintained from 20% to 41% higher Ksat than did untreated soil, for all times tested. Results indicated density ([rho]) increased, and total porosity and pore-size decreased rapidly after a 15-min rainfall. HRCT-[rho] data helped identify the best model selection for characterizing seal [rho] profile. Although the cost is expensive, HRCT image is a valuable tool to measure soil properties by analyzing soil thickness down to 0.015-mm. The study confirms that HRCT-analysis of soil allows accurate and direct measurements of seal effects on water flow and documents the usefulness of PAM for reducing surface sealing. en_US
dc.language.iso en_US en_US
dc.publisher University of Missouri--Columbia en_US
dc.subject.lcsh Soil permeability -- Measurement en_US
dc.subject.lcsh Soil crusting en_US
dc.subject.lcsh Silt loam en_US
dc.subject.lcsh Rain and rainfall en_US
dc.subject.lcsh Runoff en_US
dc.title Soil surface-seal measurement using high-resolution x-ray computed tomography (HRCT) en_US
dc.type Thesis en_US
thesis.degree.discipline Soil, environmental and atmospheric sciences en_US
thesis.degree.grantor University of Missouri--Columbia en_US
thesis.degree.name M.S. en_US
thesis.degree.level Masters en_US
dc.identifier.merlin .b59445634 en_US
dc.identifier.oclc 166290506 en_US
dc.relation.ispartofcommunity University of Missouri-Columbia. Graduate School. Theses and Dissertations. Theses. 2006 Theses
dc.relation.ispartofcollection 2006 Freely available theses (MU)


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