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Dissertations / Theses on the topic 'Macropore flow'

Author: Grafiati

Published: 4 June 2021

Last updated: 19 February 2022

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1

Rombang, Johan Alexander. "An investigation into subsurface macropore flow using an artificial macropose system." Thesis, University of Reading, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336690.

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2

Ratcliffe, Elizabeth B. "Short-term hydrological responses of a forested hillslope during rainstorms, at Panola Mountain Research Watershed, Georgia, USA." Thesis, University of Bristol, 1996. http://hdl.handle.net/1983/099d7ff8-9ba5-41f8-ae62-78f063f8e8be.

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A small-scale filed experiment was conducted on a hillslope plot within the Georgia Piedmont, USA, with the aim of elucidating the hydrological processes which generate storm runoff and its chemistry. Intensive hydrometric and chemical sampling enabled the collection of detailed observations of hillslope processes during rainstorms. The passage of water was traced through a one-dimensional profile in the hillslope, where rainfall, throughfall, forest floor soil water, soil water at 15, 40, 50 and 70 cm depths, groundwaters and streamwaters were monitored, either manually or automatically. Chem

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3

Weiler, Markus Helmut Weiler Markus Helmut. "Mechanisms controlling macropore flow during infiltration : dye tracer experiments and simulations /." Zürich : ETH, Eidgenössische Technische Hochschule Zürich, IHW, Institut für Hydromechanik und Wasserwirtschaft, 2001. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=14237.

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4

Batany, Stéphane. "Influence d’un macropore sur l’écoulement et le transport de solutés en milieu poreux : expérimentations sur sol modèle macroporé et simulations numériques." Thesis, Paris Est, 2016. http://www.theses.fr/2016PESC1085/document.

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La modélisation des écoulements et du transport dans les milieux poreux est un domaine actif pour, notamment, progresser dans la compréhension du transfert des polluants dans les sols. Les sols présentent fréquemment des hétérogénéités comme des macropores (provoqués par la faune, la flore ou des fissures) et un certain nombre de modèles numériques utilisent les concepts de double ou de multi-perméabilité pour tenir compte de tous les types d’écoulements susceptibles de coexister dans de tels systèmes. Cependant, les modèles classiques semblent sous-estimer l’effet de la macroporosité sur l’éc

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5

Asare, Seth Ntiri. "Investigation of soil macroporosity and macropore flow in agricultural soils using volume CT scanner." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0007/NQ40361.pdf.

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6

Vivian, Benjamin James. "The role of rapid recharge processes in the initiation of landslides." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286619.

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7

Naveed, Muhammad, Per Moldrup, Marcel G. Schaap, Markus Tuller, Ramaprasad Kulkarni, Hans-Jörg Vogel, and de Jonge Lis Wollesen. "Prediction of biopore- and matrix-dominated flow from X-ray CT-derived macropore network characteristics." COPERNICUS GESELLSCHAFT MBH, 2016. http://hdl.handle.net/10150/621951.

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Prediction and modeling of localized flow processes in macropores is of crucial importance for sustaining both soil and water quality. However, currently there are no reliable means to predict preferential flow due to its inherently large spatial variability. The aim of this study was to investigate the predictive performance of previously developed empirical models for both water and air flow and to explore the potential applicability of X-ray computed tomography (CT)-derived macropore network characteristics. For this purpose, 65 cylindrical soil columns (6 cm diameter and 3.5 cm height) wer

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8

Pechenik, Natalie. "Lateral macropore dominated flow on a clay settling area in the phosphate mining district, peninsular Florida." [Tampa, Fla] : University of South Florida, 2009. http://purl.fcla.edu/usf/dc/et/SFE0002982.

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9

Turpin, Karine. "Macropore flow and soil hydraulic properties as affected by manurebiosolids injector implements under variable soil physical conditions." Thesis, University of Ottawa (Canada), 2005. http://hdl.handle.net/10393/27062.

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The aim of this study was to investigate, at various soil water contents, the tillage effects of two different types of injectors on soil hydraulic properties of a loamy clay soil located in Winchester, Ontario, Canada. The two injectors considered are the AerWay SSD (A) and the Kongskilde Vibro-Flex (K). The soil-properties changes associated with the injectors were assessed at ten different soil water contents for both injectors. The first part of this research involves the evaluation of field saturated hydraulic conductivity (Kfs), matrix flux potential (&phis;m), bulk density (rhob) and vo

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10

McEwen, Amiana Marie. "Abundance, Distribution, and Geometry of Naturally Occurring Macropores in Stream Banks." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/95948.

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Preferential flow paths are areas of substantially higher permeability than surrounding media. Macropores and soil pipes are a type of preferential flow path where conduit-like voids in the subsurface are typically greater than three millimeters in diameter. They are known to occur in agricultural and forest soils, often as a result of biological and physical processes. Macropores also exist in stream banks and have the potential to enhance the exchange of water and solutes between the channel and riparian groundwater, yet the geographic distribution of bank macropores is unknown. Here we dete

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11

Larsson, Martin. "Quantifying macropore flow effects on nitrate and pesticide leaching in a structured clay soil : field experiments and modelling with the MACRO and SOILN models /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 1999. http://epsilon.slu.se/avh/1999/91-576-5489-1.pdf.

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12

Martín, Sánchez David. "Desarrollo de biosensores fotónicos basados en membranas de silicio poroso." Doctoral thesis, Universitat Politècnica de València, 2019. http://hdl.handle.net/10251/125695.

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[ES] El desarrollo de los biosensores está permitiendo llevar a cabo análisis bioquímicos cada vez más rápidos, de manera mucho más sencilla y utilizando una menor cantidad de muestra. Esto está dando lugar a aplicaciones en las que se monitorizan parámetros de manera continua y autónoma, aumentando la eficiencia y reduciendo los costes. El tema principal de esta Tesis ha sido el desarrollo y la evaluación de biosensores que se basan en técnicas de transducción óptica, fabricados en silicio poroso, un material nanoestructurado que puede llegar a alcanzar una gran sensibilidad. El trabajo ha co

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13

McDonald, Douglas Joseph. "The role of macropores in subsurface flow on a forested slope, an experimental investigation." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ40480.pdf.

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14

Perret, Johan S. "Characterization, visualization and quantification of soil macropores and preferential flow using SPECT and X-ray CAT scanning." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq52022.pdf.

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15

Bruggeman, Adriana C. Jr. "Preferential movement of solutes through soils." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/26159.

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Detection of unexpectedly high concentrations of agricultural pollutants in ground water have inspired investigations of the role of preferential movement of chemicals through agricultural soils. This research focuses on preferential flow and solute transport processes and the effects of agricultural management practices on these processes. Experimental methods for monitoring preferential flow and solute transport in the field as well as a stochastic, physically-based model for predicting water flow and transport of non-reactive chemicals in heterogeneous soils with naturally occurring macropo

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16

Steiner, Laure D. "A Study of the fate and transport of estrogenic hormones in dairy effluent applied to pasture soils." Diss., Lincoln University, 2009. http://hdl.handle.net/10182/1306.

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The disposal of waste from agricultural activities has been recognised as a source of environmental contamination by endocrine disrupting chemicals (EDCs). The New Zealand dairy industry produces a large volume of dairy farm effluent, which contains EDCs in the form of estrogens. Most of this dairy farm effluent is applied onto the land for disposal. Groundwater and soil contamination by estrogens following waste application on the land have been reported overseas, but our understanding of the processes and factors governing the fate of estrogens in the soil is poor. Therefore the main goal o

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17

Jiang, Shuang. "Bacterial leaching from dairy shed effluent applied to a fine sandy loam under flood and spray irrigations." Lincoln University, 2008. http://hdl.handle.net/10182/668.

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Land application of wastes has become increasingly popular, to promote nutrient recycling and environmental protection, with soil functioning as a partial barrier between wastes and groundwater. Dairy shed effluent (DSE), may contain a wide variety of pathogenic micro-organisms, including bacteria (e.g. Salmonella paratyphyi, Escherichia coli. and Campylobacter), protozoa and viruses. Groundwater pathogen contamination resulting from land-applied DSE is drawing more attention with the intensified development of the dairy farm industry in New Zealand. The purpose of this research was to investi

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18

Cey, Edwin E. "Macropore flow and transport dynamics in partially saturated low permeability soils." Thesis, 2007. http://hdl.handle.net/10012/3438.

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Near-surface sediments play an important role in governing the movement of water and contaminants from the land surface through the vadose zone to groundwater. Generally, low permeability surficial soils restrict water flow through the vadose zone and form a natural protective barrier to migration of surface applied contaminants. These types of fine-grained soils commonly contain macropores, such as fractures, animal burrows, and root holes, that have been identified as preferential flow pathways in the subsurface. Accordingly, macropores have the potential to influence groundwater recharge

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19

Cavers, Curtis G. "Characteristics of Red River clays pertaining to vertisolic criteria and macropore flow." 2009. http://hdl.handle.net/1993/3706.

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Clay soils predominately composed of montmorillonite possess a high shrink-swell potential that has taxonomic and practical implications. The presence of slickensides and evidence of high shrink-swell in these soils may meet revised criteria which would place these soils under a Vertisolic Order, or as vertic intergrades of Chernozemic, Gleysolic, Luvisolic or Solonetzic Orders in the Canadian System of Soil Classification. The presence of large cracks and biological pathways in these soils may result in higher rates of water flow and potential for pollutant transport than previously expected.

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20

Arora, Bhavna. "Modeling Biogeochemistry and Flow within Heterogeneous Formations in Variably-Saturated Media." Thesis, 2012. http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11499.

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This dissertation focuses on understanding the complex interactions between hydrological and geochemical processes, and specifically how these interactions are affected by subsurface heterogeneity across scales. Heterogeneity in the form of macropores and fractures provide preferential flowpaths and affect contaminant transport. Biogeochemical processes are also strongly affected by such heterogeneities. Any lithological layering or interface (e.g. plume fringe, wetland-aquifer boundary, etc.) increases biogeochemical activity around that interface. Hydrologic conditions, rainfall events, drai

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21

Luo, Lifang Lin Hangsheng. "Quantification of soil macropore network and its relationship to preferential flow using combined x-ray computed tomography and breakthrough curve analysis." 2009. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-3370/index.html.

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22

Sun, Hao. "Carbon Sequestration through Biochar Soil Amendment: Experimental studies and mathematical modeling." Thesis, 2012. http://hdl.handle.net/1911/64652.

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Intentional amendment of soil with charcoal (called biochar) is a promising new approach to sequester atmospheric carbon dioxide and increase soil fertility. However, the environmental properties of biochars can vary with production conditions, making it challenging to engineer biochars that are simultaneously optimized for carbon sequestration, nutrient storage, and water-holding capacity. For this reason, I have undertaken a systematic study to (a) determine the pyrolysis conditions that lead to biochars with desired chemical and physical properties, and (b) find how these properties affect

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23

Frey, Steven Kurt. "A detailed hydrologic evaluation of tile-drained macroporous soils: A field and modelling study." Thesis, 2011. http://hdl.handle.net/10012/5811.

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The underlying objective of this research is to improve the overall understanding of how spatial and temporal variability in macroporosity and soil hydraulic properties in the shallow subsurface influence the long term mobility of agricultural nutrients, and specifically the movement of liquid swine manure, in macroporous, tile drained soils. The principal motivation for the work was to provide insight into dynamic nutrient mobility in this type of agricultural environment in order to guide both the efficiency and environmental sustainability of nutrient management practices. The results of th

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24

Fröhlich, Daniel. "Raumzeitliche Dynamik der Parameter des Energie-, Wasser und Spurengashaushalts nach Kleinkahlschlag." Doctoral thesis, 2009. http://hdl.handle.net/11858/00-1735-0000-0006-B12C-F.

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