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Dissertations / Theses on the topic 'Spatial variability of soils'

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Published: 20 July 2024

Last updated: 31 July 2025

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1

Young, Fred J. "Spatial variability of soil properties within a loess-covered, upland landscape /." free to MU campus, to others for purchase, 1996. http://wwwlib.umi.com/cr/mo/fullcit?p9823319.

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2

Kim, Hyunki. "Spatial variability in soils stiffness and strength /." Diss., Available online, Georgia Institute of Technology, 2005, 2005. http://etd.gatech.edu/theses/available/etd-07132005-194445/.

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Thesis (Ph. D.)--Civil and Environmental Engineering, Georgia Institute of Technology, 2006.<br>Mayne, Paul, Committee Member ; Frost, David, Committee Member ; Santamarina, Carlos, Committee Chair ; Rix, Glenn, Committee Member ; Ruppel, Carolyn, Committee Member.

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3

Hendrayanto. "Analyses on Spatial Variability in Hydraulic Properties of Forest Soils." Kyoto University, 1999. http://hdl.handle.net/2433/181882.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(農学)<br>甲第7873号<br>農博第1031号<br>新制||農||775(附属図書館)<br>学位論文||H11||N3236(農学部図書室)<br>UT51-99-G467<br>京都大学大学院農学研究科森林科学専攻<br>(主査)教授水山高久, 教授三野徹, 教授吉田博宣<br>学位規則第4条第1項該当

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4

El-Haris, Mamdouh Khamis. "Soil spatial variability: Areal interpolations of physical and chemical parameters." Diss., The University of Arizona, 1987. http://hdl.handle.net/10150/184290.

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Four fields of 117 ha area located at the University of Arizona's Maricopa Agricultural Center were selected for this study. Two soil series, the Casa Grande sandy clay loam and Trix clay loam occur. Surface samples (0-25 cm) were collected on a 98 m interval and 3 rows providing 47 sites per field. Sites were classified either as surveying (32) or testing (15) in each of the four fields. Additional samples at 25-50, 50-75, 75-100, and 100-125 cm were obtained with duplicate surface undisturbed cores at 5 sites per field. Soil parameters include bulk density, saturated hydraulic conductivity,

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5

Okae-Anti, Daniel Theophilus Akwa. "Spatial variability studies in relation to pedogenic processes in alluvial soils." Thesis, University of Reading, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239027.

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6

Saez, Carolin Cordova. "Spatial variability of soil organic matter fractions in arable and grassland soils - implications for soil N supply." Thesis, University of Reading, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.542058.

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7

Huang, Xuewen. "Analysis of effects of soil properties, topographical variables and management practices on spatial-temporal variability of crop yields." Diss., Connect to online resource - MSU authorized users, 2008.

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8

Parker, Ronald Dean 1948. "The effect of spatial variability on output from the water erosion prediction project soil erosion computer model." Diss., The University of Arizona, 1991. http://hdl.handle.net/10150/191165.

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Spatial variability is all that stands between hydrology and science, forcing us to deal in probabilities and averages. Because of scale, we can not consider forces on individual soil particles, water molecules and solute ions when addressing human size problems. We must therefore look at aggregate properties and mean values for parameters and inputs in computer modeling of hydrologic phenomena. This research explores the impact of spatially variable inputs on the Water Erosion Prediction Project soil erosion computer program. Distributions of input variables are generated and assigned randoml

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9

Schöning, Ingo. "Organic matter stocks in temperate forest soils composition, radiocarbon age and spatial variability /." [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=978952839.

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10

Suliman, Ahmed Saeid Ahmed. "Spectral and spatial variability of the soils on the Maricopa Agricultural Center, Arizona." Diss., The University of Arizona, 1989. http://hdl.handle.net/10150/184678.

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Dry and wet fine earth spectral measurements were made on the Ap soil surface horizons on the Maricopa Agricultural Center by using a Barnes Modular Multiband Radiometer. Three subsets were used in the analyses 552, 101 and 11. There were three soil series, Casa Grande, Shontik and Trix, four soil mapping units, and three texture classes identified on the farm. The wet soil condition reduced the amplitude of the spectral curves over the entire spectrum range (0.45 to 2.35 μm). The spectral curves were statistically related to the soil mapping units to determine if the soil mapping units and te

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11

Amajuoyi, Ifeanyichukwu Larry. "Spatial variability of some selected chemical soil properties in forest soils under shifting cultivation in southeast Nigeria." Thesis, University of Reading, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270420.

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12

Manyevere, Alen. "Evaluation and mapping of the spatial variability of soil fertility at Zanyokwe Irrigation Scheme in the Eastern Cape, South Africa." Thesis, University of Fort Hare, 2010. http://hdl.handle.net/10353/d1001019.

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13

Ryan, Andrea L. "Assessment of spatial variability of silage corn quality and biomass using remote sensing and GIS techniques." Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/30294.

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The Matsqui area of the Lower Fraser Valley exhibits extreme soil heterogeneity, as the alluvial soils in the area have been deposited by the Fraser River as a series of coarse-textured ridges and finer-textured depressional areas. This variability poses some obvious problems with respect to agricultural management. The main aim of this study was to evaluate soil spatial variability in four fields, and to relate this soil variability to corn production and quality. Site conditions, topography, and soil chemical and physical variables were related to corn biomass and nutrient concentrations us

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14

Fletcher, Cheryl Florence. "Spatial variability of weeds, soils and crops in fields of the south Peace River region, Alberta." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ40049.pdf.

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15

Zhang, Xi. "SPATIAL ESTIMATION OF HYDRAULIC PROPERTIES IN STRUCTURED SOILS AT THE FIELD SCALE." UKnowledge, 2019. https://uknowledge.uky.edu/pss_etds/117.

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Improving agricultural water management is important for conserving water during dry seasons, using limited water resources in the most efficient way, and minimizing environmental risks (e.g., leaching, surface runoff). The understanding of water movement in different zones of agricultural production fields is crucial to developing an effective irrigation strategy. This work centered on optimizing field water management by characterizing the spatial patterns of soil hydraulic properties. Soil hydraulic conductivity was measured across different zones in a farmer’s field, and its spatial variab

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16

van, Haren Joost Lambertus Maria. "Spatial and Temporal Variability of Soil CO2 and N2O Fluxes in Tropical Forest Soils: the Influence of Tree Species, Precipitation, and Soil Texture." Diss., The University of Arizona, 2011. http://hdl.handle.net/10150/145108.

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The tropics are the largest natural source of CO2 and N2O to the atmosphere and many tropical forests are changing due to climate change and forest fragmentation. To understand how these changes are affecting ecosystem feedbacks to climate change we need to investigate the plant-soil interactions in tropical forests on both local and regional scale. Locally, tree species do influence soil N2O fluxes and biogeochemistry in diverse forests. I found N2O fluxes close to four out of fifteen tree species consistently elevated above the overall mean and consistently low near two other species. H

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17

Narsilio, Guillermo Andres. "Spatial Variability and Terminal Density -Implications in Soil Behavior-." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10462.

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Geotechnical engineers often face important discrepancies between the observed and the predicted behavior of geosystems. Two conceptual frameworks are hypothesized as possible causes: the ubiquitous spatial variability in soil properties and process-dependent terminal densities inherent to granular materials. The effects of spatial variability are explored within conduction and diffusion processes. Mixtures, layered systems, inclusions and random fields are considered, using numerical, experimental and analytical methods. Results include effective medium parameters and convenient design and an

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18

Li, Yixiang Li. "Numerical modeling of supported excavations considering soil spatial variability." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1510322541966921.

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19

Greenholtz, Deborah Esther 1958. "Spatial variability of hydrologic properties in an irrigated soil." Thesis, The University of Arizona, 1990. http://hdl.handle.net/10150/278505.

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The spatial and temporal variability of water content, soil water tension, and derived hydraulic conductivity parameters are analyzed using geostatistical methods. The measured data sets were obtained from a 1985 experiment near Las Cruces, New Mexico. Post-irrigation water content and tension measurements had been recorded over 44 days at 455 sampling locations along a 91 x 1.5-meter transect. Unsaturated hydraulic conductivity values are derived using the instantaneous profile formula, and an exponential model is used to obtain values of saturated hydraulic conductivity and pore-size distrib

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20

Phefadu, Kopano Conferance. "Physico-chemical characterization and spatial variability of soils in the research block at University of Limpopo Experimental Farm." Thesis, University of Limpopo, 2015. http://hdl.handle.net/10386/1686.

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Thesis (MSc. (Soil Science)) -- University of Limpopo, 2015<br>There exists a considerable level of spatial variability in soil physical and chemical properties within the research block; and the soils are generally shallow. Of all the measured parameters, electrical conductivity, Bray-1 P, exchangeable potassium, calcium and sodium as well as extractable iron and zinc showed a huge percent of variation across the field. Soil variability maps indicated the degree of variability within the research block. The spatial variability of the characterized parameters was significant across the researc

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21

Smith, Richard D. "Desertification, overgrazing and soil spatial variability in an arid savanna." Thesis, University of Sheffield, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327643.

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22

FLORES, EMERSON ALEX FIGUEROA. "PROBABILISTIC ANALYSIS OF SLOPE STABILITY CONSIDERING SPATIAL VARIABILITY OF SOIL." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2008. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=12093@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>Freqüentemente as análises de estabilidade de taludes são feitas por métodos determinísticos, nos quais é obtido um Fator de Segurança (FS). Estes métodos não quantificam as incertezas existentes nas variáveis de entrada (parâmetros de resistência) na análise. Tampouco mostram detalhes sobre qual variável afeta mais o resultado. Os métodos probabilísticos permitem superar estes problemas. A presente pesquisa tem como objetivo comparar dois métodos probabilísticos geralmente utilizados (Estimativas Pontuais e Segundo Moment

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Blumenthal, Kinsey Megan. "Predicting Spatial Variability of Soil Organic Carbon in Delmarva Bays." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/73692.

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Agricultural productivity, ecosystem health, and wetland restoration rely on soil organic carbon (SOC) as vital for microbial activity and plant health. This study assessed: (1) accuracy of topographic-based non-linear models for predicting SOC; and (2) the effect of analytic strategies and soil condition on performance of spectral-based models for predicting SOC. SOC data came from 28 agriculturally converted Delmarva Bays sampled down to 1 meter. R2 was used as an indicator of model performance. For topographic-based modeling, correlation coefficients and condition indices reduced 50 terrain

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24

Wagstaffe, Daniel Raymond. "Spatial Variability of Soil Velocity using Passive Surface Wave Testing." DigitalCommons@CalPoly, 2015. https://digitalcommons.calpoly.edu/theses/1526.

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Lifelines such as highways, pipelines, telecommunication lines, and powerlines provide communities with vital services, and their functionality is dependent upon the foundation soil that supports them. However, when designing the infrastructure, it can be difficult to know where to test the soil in order to give spatially representative sampling, particularly for long, lifeline structures. Finding this distance requires knowledge of the spatial correlation and/or the spatial variability of the soil parameter (stiffness, cohesion, etc.). But this correlation distance is not typically found in p

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25

Paterson, Stacey. "Soil Spatial Scaling: Modelling variability of soil properties across scales using legacy data." Thesis, The University of Sydney, 2018. http://hdl.handle.net/2123/19895.

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Understanding how soil variability changes with spatial scale is critical to our ability to understand and model soil processes at scales relevant to decision makers. This thesis uses legacy data to address the ongoing challenge of understanding soil spatial variability in a number of complementary ways. We use a range of information: precision agriculture studies; compiled point datasets; and remotely observed raster datasets. We use classical geostatistics, but introduce a new framework for comparing variability of spatial properties across scales. My thesis considers soil spatial variabilit

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26

Dong, Jingnuo. "Evaluating new approaches to measure and map soil moisture spatial variability." Thesis, Oklahoma State University, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=1542171.

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<p> Knowledge of soil moisture spatial patterns provides basic but important information in studies of hydrological processes. At the field to subwatershed scale, soil moisture spatial variability is critical to aid in hydrologic modeling, but has not been adequately studied. Two new approaches were taken to contribute to the study of soil moisture spatial variability at this scale. The Bayesian Maximum Entropy (BME) framework is a more general method than classical geostatistics and has not yet been applied to soil moisture spatial estimation. The recently developed mobile Cosmic-ray Soil Moi

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27

FERRE', CHIARA. "Monitoring of greenhouse gas emissions from agricultural and forest soils." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2009. http://hdl.handle.net/10281/7483.

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Global climate change is becoming a central issue in contemporary science as well as politics. There is a long-lasting debate about the cause of the climate change: anthropogenic activity versus the natural cycle. However, a scientific consensus is coming a conclusion that the contemporary climate change is mainly caused by anthropogenic emissions of the greenhouse gases (GHG), including carbon dioxide (CO2), nitrous oxide (N2O) and methane (CH4). The main objective of the thesis is the monitoring of such GHG emissions from two ecosystem types: a forest and a rice paddy ecosystem. The fores

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28

Reyes, Javier. "EXPLORING SPATIAL AND TEMPORAL VARIABILITY OF SOIL AND CROP PROCESSES FOR IRRIGATION MANAGEMENT." UKnowledge, 2018. https://uknowledge.uky.edu/pss_etds/107.

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Irrigation needs to be applied to soils in relatively humid regions such as western Kentucky to supply water for crop uptake to optimize and stabilize yields. Characterization of soil and crop variability at the field scale is needed to apply site specific management and to optimize water application. The objective of this work is to propose a characterization and modeling of soil and crop processes to improve irrigation management. Through an analysis of spatial and temporal behavior of soil and crop variables the variability in the field was identified. Integrative analysis of soil, crop, pr

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29

MARRONE, VITTORIO ALESSANDRO. "Rilevamento e rappresentazione cartografica della variabilità spaziale dei suoli a differenti scale d'indagine: i casi studio di Monastir e del Foglio 549 Muravera." Doctoral thesis, Università degli Studi di Cagliari, 2007. http://hdl.handle.net/11584/265946.

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The considerable spatial variability of soils makes the possibility of making teoric models of survey and representation difficult. Nowadays, traditional surveys and others using the application of new technologies are still the best way to mark soils in a specific area. One main difference is that with the first methods, (openings of profiles, drillings, chemical analysis) is very expansive to do measurements in all the points of a particular site, and these expenditures are not sustainable by normal research centres and in general by public spending while, with the second methods there is a

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30

Quick, Tyler James. "Temporal and Spatial Variability in Base Materials Treated with Asphalt Emulsion." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/2715.

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The first objective of this research was to investigate temporal trends in the mechanical properties of base materials stabilized with asphalt emulsion and to assess the rate at which emulsion-treated base (ETB) design properties are achieved. The second objective of this research was to identify construction and environmental factors most correlated to specific mechanical properties of ETB layers and to determine which construction factors exhibit the greatest variability. Additional statistical analysis was performed to determine if significant differences existed between different test sect

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Neumann, William John III. "The use of ground penetrating radar to determine the presence, extent, and spatial variability of fire related hydrophobic soils in fire impacted watersheds in southern California." Diss., University of Iowa, 2016. https://ir.uiowa.edu/etd/2251.

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Ground Penetrating Radar (GPR) methods have been used to evaluate the presence, extent, and spatial variability of hydrophobic soils in Southern California Watersheds. It has been shown that high frequency ground penetrating radar equipment, under certain conditions, has the ability to determine the presence, depth, and persistence of post fire hydrophobic soils. As part of this study an extensive investigation was undertaken to not only evaluate the capability of this approach but also to understand under what conditions the method can be applied successfully and what are the limitations of t

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Thomazini, André. "Spatial and temporal variability of CO2 dynamic and soil attributes in Maritime Antarctica." Universidade Federal de Viçosa, 2016. http://www.locus.ufv.br/handle/123456789/10391.

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Submitted by Marco Antônio de Ramos Chagas (mchagas@ufv.br) on 2017-05-19T13:47:10Z No. of bitstreams: 1 texto completo.pdf: 1800381 bytes, checksum: 348713e32fe650d04684641d1f30d461 (MD5)<br>Made available in DSpace on 2017-05-19T13:47:10Z (GMT). No. of bitstreams: 1 texto completo.pdf: 1800381 bytes, checksum: 348713e32fe650d04684641d1f30d461 (MD5) Previous issue date: 2016-04-25<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>A Antártica Marítima apresenta alta sensibilidade às mudanças climáticas, especialmente pelas alterações na temperatura do ar, que modificam a

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33

Lucian, Charles. "Geotechnical Aspects of Buildings on Expansive Soils in Kibaha, Tanzania." Doctoral thesis, KTH, Jord- och bergmekanik, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9244.

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The focus of this study is on potential damages to buildings resulting from expansive soils in Tanzania, particularly clay soils in Kibaha. For the fact that most of the affected structures are founded on expansive soils, a clear understanding of the behaviour of soils and their interaction with structures has been of interest to the study in order to evaluate properly the source of the problem.The geotechnical behaviour of expansive clay soils is investigated by looking into the geomorphologic, geological and climatic conditions and mineralogical composition of the soils in the study area.Two

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Siewert, Matthias Benjamin. "High-resolution mapping and spatial variability of soil organic carbon storage in permafrost environments." Doctoral thesis, Stockholms universitet, Institutionen för naturgeografi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-134986.

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Large amounts of carbon are stored in soils of the northern circumpolar permafrost region. High-resolution mapping of this soil organic carbon (SOC) is important to better understand and predict local to global scale carbon dynamics. In this thesis, studies from five different areas across the permafrost region indicate a pattern of generally higher SOC storage in Arctic tundra soils compared to forested sub-Arctic or Boreal taiga soils. However, much of the SOC stored in the top meter of tundra soils is permanently frozen, while the annually thawing active layer is deeper in taiga soils and m

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35

Pan, Luan. "Means to optimize soil water management through monitoring spatial and temporal variability of geophysical soil attributes." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=117181.

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To optimize irrigation water use, temporal and spatial sensor-based data related to soil water content were integrated. Nine locations in a 37-ha agricultural field were selected using field elevation and soil ECa maps for monitoring the soil matric potential and temperature at four depths (18, 48, 79 and 109 cm) with a wireless sensor network. Using a linear regression approach, a series of time-specific equations were developed to quantify both the temporal and spatial soil water stress status through a Water Stress Index (WSI). The WSI was estimated using soil matric potential measurements

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Zimmermann, Beate. "Spatial and temporal variability of the soil saturated hydraulic conductivity in gradients of disturbance." Phd thesis, Universität Potsdam, 2007. http://opus.kobv.de/ubp/volltexte/2008/1640/.

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As land-cover conversion continues to expand into ever more remote areas in the humid tropics, montane rainforests are increasingly threatened. In the south Ecuadorian Andes, they are not only subject to man-made disturbances but also to naturally occurring landslides. I was interested in the impact of this ecosystem dynamics on a key parameter of the hydrologic cycle, the soil saturated hydraulic conductivity (synonym: permeability; Ks from here on), because it is a sensitive indicator for soil disturbances. My general objective was to quantify the effects of the regional natural and human

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Nijbroek, Ravic. "Understanding and simulating spatial soil water and yield variability in an irrigated soybean field." [Florida] : State University System of Florida, 1999. http://etd.fcla.edu/etd/uf/1999/amp7403/nijbroek.pdf.

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Thesis (M.E.)--University of Florida, 1999.<br>Title from first page of PDF file. Document formatted into pages; contains xvi, 151 p.; also contains graphics. Vita. Includes bibliographical references (p. 148-150).

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Fan, Haijian. "Performance Based Design of Deep Foundations in Spatially Varying Soils." University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1384959587.

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Whitaker, Martha Patricia Lee 1965. "Small-scale spatial variability of soil moisture and hydraulic conductivity in a semi-arid rangeland soil in Arizona." Thesis, The University of Arizona, 1993. http://hdl.handle.net/10150/192081.

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The correlation scales of soil moisture and hydraulic conductivity were investigated within a 4.4 hectare semi-arid rangeland watershed using measurements obtained from time domain reflectometry and disc permeameters, respectively. Soil moisture measurements were collected at four different times in 1991 to yield a varied set of natural soil moisture conditions. Soil moisture was sampled over a 30 meter grid, two perpendicular transects at 5 meter intervals, once at 1 meter intervals, and once at intervals of — 0.10 m within a 1 xl meter plot. Variogram functions showed evidence of spatial cor

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Hirobe, Muneto. "Spatial Variability of Soil Nitrogen Dynamics along a Forest Slope in a Cryptomeria japonica D.Don Plantation." Kyoto University, 1999. http://hdl.handle.net/2433/181395.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(農学)<br>甲第8030号<br>農博第1080号<br>新制||農||789(附属図書館)<br>学位論文||H11||N3325(農学部図書室)<br>UT51-99-T741<br>京都大学大学院農学研究科地域環境科学専攻<br>(主査)教授武田博清, 教授谷誠, 教授小﨑隆<br>学位規則第4条第1項該当

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Uribeetxebarria, Alonso de Armiño Asier. "Assessing soil and canopy spatial variability in fruit orchards to improve management and sampling by using auxiliary information provided by proximal and remote sensors." Doctoral thesis, Universitat de Lleida, 2019. http://hdl.handle.net/10803/666921.

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Aquesta Tesi doctoral s’ha centrat en l’estudi de la variabilitat espacial present en parcel•les fructícoles de la zona central de la Vall de l’Ebre. En una primera part, i amb l’objectiu d’obtenir zones de maneig diferenciat, la variabilitat del sòl i el vigor dels presseguers (Prunus pèrsica (L.) Stokes) foren analitzats. En una segona part, la informació auxiliar aportada per diferents sensors fou utilitzada per estimar paràmetres quantitatius (kg/arbre) i qualitatius (fermesa i índex refractomètric) mitjançant tècniques de mostreig avançades (mostreig estratificat (StRS) i el ranked set sa

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Lachérade, Lucas. "Apports de la modélisation de la variabilité spatiale géotechnique appuyée par la géologie dans un projet de creusement de tunnel : application au Grand Paris Express." Electronic Thesis or Diss., Bordeaux, 2024. http://www.theses.fr/2024BORD0063.

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L’urbanisation croissante du monde et la densification des aires urbaines entraînent une multiplication des projets d’aménagement souterrains. Dans ce cadre, la connaissance du sous-sol urbain constitue l’un des grands enjeux actuels et futurs. Cependant, cette connaissance est souvent partielle et incertaine, induisant des risques élevés lors de la phase de construction des ouvrages. C'est dans ce contexte que s'inscrit cette thèse. Elle contribue à valoriser la caractérisation et l'intégration de la variabilité spatiale géotechnique des sous-sols dans la construction d’ouvrages souterrains d

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Peterson, Shelley. "Spatial variability of soil nitrogen, crop yields and delta yield in relation to variable rate nitrogen fertilization." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ35922.pdf.

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Angstmann, Julia L. "Spatial and temporal variability of tree transpiration and its drivers along a soil drainage gradient in the boreal black spruce forest." Laramie, Wyo. : University of Wyoming, 2009. http://proquest.umi.com/pqdweb?did=1990985251&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.

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Sow, Djibril. "Variabilité spatiale de la résistance au cisaillement des discontinuités des fondations rocheuses de barrages." Thèse, Université de Sherbrooke, 2015. http://hdl.handle.net/11143/6707.

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Résumé : Les barrages induisent un impact potentiellement important sur l'environnement et la société par la modification des écosystèmes, le déplacement des populations en amont et surtout par la présence d'un risque imposé aux populations situées à l'aval. Même si les ruptures de ces ouvrages ont une probabilité d'occurrence faible, la cause principale des accidents, à côté des submersions par des crues imprévues, a toujours été la rupture des fondations (ICOLD 1993) suite à des problèmes d'érosion, ou d'insuffisance de résistance au cisaillement le long des discontinuités rocheuses, des joi

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Manning, Grant Russell. "Relations between spatial variability of soil properties and grain yield response to nitrogen fertilizer in a variable Manitoba soil-landscape." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ45091.pdf.

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Durrett, Melody S. "Spatial variability in plant and soil properties on New Zealand seabird islands, and the effects of introduced rats." Thesis, University of Alaska Fairbanks, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3624440.

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<p> Seabirds are ecosystem engineers with two major impacts on island ecosystems: they bring large quantities of marine nutrients to the terrestrial environment in the form of guano, carcasses, feathers, eggs, and spilled food, and they disturb the soil surface. Burrowing seabirds can denude the soil surface of all seedlings and leaf litter, plowing them under and loosening the soil. However, seabirds are colonial, and burrows are not even spaced over the surface of an island, producing spatial variability within a single island that might reveal how seabird activities control island ecosyste

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Holleran, Molly E. "Quantifying catchment scale soil variability in Marshall Gulch, Santa Catalina Mountains Critical Zone Observatory." Thesis, The University of Arizona, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=1538334.

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<p> The quantification and prediction of soil properties is fundamental to further understanding the Critical Zone (CZ). In this study we aim to quantify and predict soil properties within a forested catchment, Marshall Gulch, AZ. Input layers of soil depth (modeled), slope, Saga wetness index, remotely sensed normalized difference vegetation index (NDVI) and national agriculture imagery program (NAIP) bands 3/2 were determined to account for 95% of landscape variance and used as model predictors. Target variables including soil depth (cm), carbon (kg/m<sup>2</sup>), clay (%), Na flux (kg/m<su

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Junior, José Geraldo de Abreu Sousa. "Sensoriamento remoto e sistema de informações geográficas na caracterização de solos e quantificação de seus atributos." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/11/11140/tde-02032006-170350/.

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Com a crescente adoção da agricultura de precisão, há uma busca por informações mais detalhadas da variabilidade espacial dos solos em escalas que viabilizem um manejo diferenciado da área de produção. Entretanto, o custo das análises de solo é sem dúvida um dos principais entraves para obtenção dessas informações. A adoção do geoprocessamento, utilizando-se o sensoriamento remoto, GPS e sistemas de informações geográficas para caracterização de solos e quantificação de seus atributos, é um desafio que vem sendo buscado por vários pesquisadores por ser uma tecnologia alternativa de avaliação d

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Kreba, Sleem. "LAND USE IMPACT ON SOIL GAS AND SOIL WATER TRANSPORT PROPERTIES." UKnowledge, 2013. http://uknowledge.uky.edu/pss_etds/31.

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The consequences of land use choices on soil water and gas transport properties are significant for gas and water flux in agricultural environments. Spatial and temporal patterns and associations of soil water and soil gas characteristics and processes in different land uses are not well understood. The objectives of this study were to 1) characterize soil structure under crop and grass systems, 2) quantify spatial patterns and associations of soil physical characteristics in crop and grass systems, and 3) quantify spatial and temporal patterns and associations of CO2 and N2O fluxes. The resea

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