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Dissertations / Theses on the topic 'Subsurface water'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Turchetti, Gabriele. "Search for subsurface liquid water in MARSIS data." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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After the first evidence of subglacial liquid water in the subsurface near the Martian South Pole the search for further evidence of liquid water in that area has become a driver in the analysis of the Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) data. If this discovery is not an isolated case it could be possible to find a liquid water system in the subsurface. In this work data of Martian South Pole collected by MARSIS are analysed. These echoes are used to map the characteristics of Mars ground and underground topography because their power values change with the c

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2

Soultani, Massoud. "Subsurface irrigation with saline water on a loamy sand." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61843.

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3

Wiggan, Clive. "Long-term pore water pressure changes around subsurface structures." Thesis, University of Southampton, 2013. https://eprints.soton.ac.uk/362643/.

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Geotechnical engineering guidelines mandate the use of the most onerous hydraulic criteria for the design of earth retaining structures below the water table. Consequently, favourable local conditions, including the geometry of the structure, are not usually exploited. This means that retaining walls in particular are typically designed to resist hydrostatic pressures below the water table. Investigations have shown however that pore water pressures, axial stresses and bending moments reduce when groundwater seepage is allowed through the segmented linings of shallow tunnels. Contiguous pile r

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4

Zedick, Daniel. "Improving Water Use in the Landscape Through Subsurface Drip Irrigation." The University of Arizona, 2016. http://hdl.handle.net/10150/608293.

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Sustainable Built Environments Senior Capstone Project<br>This paper examines Subsurface Drip Irrigation(SDI) as a solution to water conservation in landscape irrigation. This is a problem because of the drought that the southwestern United States is experiencing, and the amount of water that landscapes utilize and which is ultimately wasted due to inefficient practices. Subsurface drip irrigation represents a potential solution due to its high efficiency and water saving ability; however, there are some problems within it as a system. Utilizing a multiple case studies approach, this paper loo

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5

Langschwager, Eugene M. "The use of radiorespirometry for evaluation of subsurface biodegradation." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/50041.

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Current use of alcohols as neat automotive fuels or as inexpensive octane enhancers in gasoline-alcohol blends, in addition to their uses as solvents and starting materials in manufacturing, have created a concern due to the increased potential for groundwater contamination. Adsorption and water solubility are primarily responsible for separating gasoline-alcohol blend components in soils and would allow alcohols to move ahead of the remaining gasoline components (e.g., benzene). The presence of alcohols would be difficult to detect, and levels hazardous to humans or animals could be reached r

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6

Peraki, Maria. "Application Of Electrokinetics In Subsurface Energy Extraction." ScholarWorks @ UVM, 2017. http://scholarworks.uvm.edu/graddis/770.

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The world’s growing population results in increased energy needs that cannot yet be fully supported by the renewable sources of energy. These modern conditions and restraints have created the need to further research methods to enhance the recovery of resources previously unavailable due to technical and/or economic reasons and to reduce the environmental impacts of using fossil fuels. In this dissertation, applications of electrokinetic phenomena for the improvement of subsurface energy resource extraction are investigated using experimental and numerical tools. Electrodialysis is proposed as

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7

Reay, William G. "Subsurface Hydrodynamics and Nutrient Exchange within an Extensive Tidal Freshwater Wetland." W&M ScholarWorks, 1989. https://scholarworks.wm.edu/etd/1539617595.

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Located between upland and riverine systems, extensive tidal freshwater wetlands are influenced by a variety of recharging water sources and their respective nutrient contents. Conversely, tidal wetlands discharge interstitial waters and solutes to surface waters during periods of aerial exposure. Geohydrologic and model simulation methodology were utilized in order to aid in the understanding of wetland subsurface flow dynamics, its influence upon pore water nutrient chemistry, and its role in nutrient exchange with adjacent surface waters. Interstitial water nutrient chemistry was monitored

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8

Jamali, Imran Ali. "Subsurface dams in water resource management : methods for assessment and location." Doctoral thesis, KTH, Mark- och vattenteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-181937.

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Natural groundwater storage can be improved by constructing a subsurface barrier that is a subsurface dam, in order to capture the subsurface flows and raise the groundwater levels (GWLs) in the sediment layers. Subsurface dams are preferable to surface dams because of lower evaporation, higher functionality, lower cost of construction, lessened risk for contamination and the possibility of utilizing land over the dam. Therefore subsurface dams constitute an affordable and effective method for the sustainable development and management of groundwater resources. The aim of this research project

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9

Clutter, Melissa, and Melissa Clutter. "The Use of Subsurface Temperature Fluctuations to Estimate Plant Water Use." Thesis, The University of Arizona, 2016. http://hdl.handle.net/10150/621451.

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Irrigation agriculture is the largest use of water (~80%) in the United States ('Irrigation and Water Use', 2016) A combination of irrigation and precipitation infiltrates through the Earth's subsurface and represents the primary inputs to an agricultural field's groundwater system. This water propagates down from the surface, with some of it recharging the underlying groundwater storage as return flow. The difference between the amount of irrigation water applied and the return flow to the aquifer, represents the consumptive use of the system. The alterations in the quality and distribution o

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10

Thompson, Thomas L., and Kerri L. Maki. "Subsurface Drip Irrigation of Leaf Lettuce and Broccoli II: Water Balance." College of Agriculture, University of Arizona (Tucson, AZ), 1995. http://hdl.handle.net/10150/221450.

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The objective of this research was to estimate a season -long water balance under one subsurface trickle- irrigated plot each of lettuce (Lactuca sativa L. var. Waldmann's Green) and broccoli (Brassica olearacea L. var. Claudia). One lettuce plot during 1992-93 and one broccoli plot during 1993-94 were intensively instrumented with automated tensiometers. Tensiometer readings and estimates of evapotranspiration were used to estimate seasonal water contents in the crop root zone, and water losses due to leaching. For the monitored portion of the 1992-3 growing season, 19.1 an of irrigation wate

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11

Copeland, Russell Dean 1963. "Hydraulic, water and energy use evaluation of subsurface trickle irrigation system." Thesis, The University of Arizona, 1992. http://hdl.handle.net/10150/278073.

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The hydraulics, water use, and energy use of a two year old subsurface drip irrigation system installed at the Maricopa Agricultural Center in southern Arizona were examined to evaluate the performance of typical subsurface drip irrigation systems. Although the pressure distribution was better than expected due to the effect of the looped network, the average discharge rate of the drip tape decreased by 20% as reflected by the change in the discharge coefficient from 0.45 to 0.36 over two years and emitter plugging resulted in the statistical uniformity being only 64.6%. Water use was higher t

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12

Blazevic, Lara Antonia. "Monitoring spatio-temporal water redistribution in the subsurface with seismic methods." Electronic Thesis or Diss., Sorbonne université, 2020. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2020SORUS015.pdf.

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La caractérisation et la surveillance des systèmes d'eau souterraine sont fondamentales pour la conservation et la gestion des ressources en eau souterraine. Dans cette intention, l'hydrogéophysique fournit une série de méthodes non invasives pour étudier l'environnement souterrain peu profond et les processus qui s'y déroulent sur plusieurs échelles. Les applications hydrogéophysiques à méthode dites time-lapse sont notamment utiles pour surveiller la dynamique de l'eau et suivre les variations temporelles de la teneur en eau. Largement dominées par des méthodes électriques et électromagnétiq

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13

Elder, Linda A. "Water table height and nitrate leaching in undisturbed soil columns." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/27874.

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Water table control by subsurface drainage has been shown to affect leaching losses of nitrate-nitrogen: a concern both for economic use of fertilizer, and for maintenance of water quality. The effect of water table height on leaching of NO₃⁻-N was investigated in this study in nineteen 15cm x 100cm undisturbed cores of silty clay loam. The experiment simulated fertilization followed by rainfall, then rapid water table rise and fall, under conditions similiar to those experienced in the early spring in the Lower Fraser Valley. In the first part of the experiment, a concentrated solution of KNO

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14

Chao, Ena C. Y. "Water table depth simulation for flat agricultural land under subsurface drainage and subirrigation practices." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26685.

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Drainable porosity as a function of water table was investigated to replace the common practice of treating it as a constant A continuous function in the form of a negative exponential equation relating drainable porosity to water table depth was developed by three methods: (1) laboratory core-sample analysis; (2) rainfall rate and water table depth analysis; (3) drainage rate and water table depth analysis. Furthermore, this function was derived for four different water table regimes: (1) subsurface drainage; (2) low subirrigation and subsurface drainage; (3) high subirrigation and subsurface

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15

Doerge, T. A., T. L. Thompson, and T. W. McCreary. "Water and Nitrogen Interactions in Subsurface Drip Irrigated Broccoli and Cauliflower Production." College of Agriculture, University of Arizona (Tucson, AZ), 1996. http://hdl.handle.net/10150/214773.

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Field experiments were conducted during the 1995-96 winter growing season at The University of Arizona's Maricopa Agricultural Center to determine the response of broccoli and cauliflower to a factorial arrangement of water rates and nitrogen (N) fertilizer rates. Both the broccoli and cauliflower experiments were randomized complete block factorial designs with three water levels (deficient, optimum, and excessive), four N fertilizer levels (deficient, suboptimal, supra optimal, excessive), and four replications. Drip tubing was buried at a depth of eight inches along the midline of each plan

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16

Poon, David. "Re-conceptualizing the soil and water assessment tool to better predict subsurface water flow through macroporous soils." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=119707.

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Efforts to manage eutrophication of surface waters should recognize that macropore flow transports significantly more phosphorus (P) to surface waters via tile drains than water that percolates through the soil matrix. For the watershed-scale SWAT (Soil and Water Assessment Tool) model to describe phosphorus transport through tile drains, SWAT needs to partition percolation into macropore flow and matrix flow. The objective of this study was to evaluate the effects of a new macropore flow algorithm on the partitioning of hydrological flows, using input data that are readily available, consiste

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17

Young, Don W., and Earl E. Burnett. "Evaluating the Effectiveness of Curtain Wells Against Subsurface Flooding in Yuma, Arizona." Arizona-Nevada Academy of Science, 1985. http://hdl.handle.net/10150/296386.

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From the Proceedings of the 1985 Meetings of the Arizona Section - American Water Resources Association and the Hydrology Section - Arizona-Nevada Academy of Science - April 27, 1985, Las Vegas, Nevada<br>During 1983 the Colorado River experienced high flow conditions due to abnormally high snowmelt and runoff from the upper basin states. Flood stages provided sufficient hydraulic head to force water under the protective levee system around Yuma, Arizona. This caused inundation of adjacent urban and agricultural lands from the subsequent rise in the local water table. A methodology was planned

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18

Nsengiyumva, Dominique. "Field evaluation of three systems for filtering polluted river water for use in subsurface irrigation." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=28868.

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Three systems for filtering polluted river water for use in subsurface irrigation have been designed, operated and evaluated. One system consisted of filtering the water through filter basins covered with grass. The second system used geotextiles in filter basins. The third system consisted of flooding a section of a field. In this system, the water was filtered as it moved through the soil towards the subsurface drainage/irrigation drain pipes.<br>It was found that grass filter basins are very efficient in removing sediment from river water. Grass filter basins having drain pipes placed in tr

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19

Hauser, Teresa J. "An evaluation of subsurface drainage water quality under carrot production in Nova Scotia." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0020/MQ57294.pdf.

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20

Li, Weiping. "A subsurface water quality evaluation system for assessing NPS pollution potential by pesticides." Diss., Virginia Tech, 1993. http://hdl.handle.net/10919/40028.

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A watershed scale water quality evaluation system was developed for assessing spatial variation of subsurface pesticide movement. The system consists of a linked-transport model component for performing simulation and a GIS component for processing spatially-related data. The surface heterogeneity caused by agricultural activities, topographic, hydrologic, and soil type variations in a watershed was handled by partitioning the watershed into homogeneous subfields. The subsurface soil profile and aquifer heterogeneities were considered by dividing the subsurface domain into root zone, intermedi

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21

Klaiber, Laura B. "Edge-Of-Field Water And Phosphorus Losses In Surface And Subsurface Agricultural Runoff." ScholarWorks @ UVM, 2016. http://scholarworks.uvm.edu/graddis/565.

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Quantifying effectiveness of soil management practices on surface and subsurface water quality at the field scale is becoming increasingly important in the Lake Champlain Basin and other agricultural watersheds. During 2012 and 2013, field plots (22.9 x 45.7 m) were established at the Lake Alice Wildlife Area in Chazy, NY to begin a long-term water quality monitoring study. Plots were established in a cool season grass field (1 ha) leased and managed by the William H. Miner Agricultural Research Institute in Chazy, NY. The soil type transitions from an excessively drained outwash soil on the u

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22

Izumi, Tomoki. "Inverse Modeling of Variably Saturated Subsurface Water Flow in Isothermal/Non-isothermal Soil." Kyoto University, 2012. http://hdl.handle.net/2433/157730.

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Kyoto University (京都大学)<br>0048<br>新制・論文博士<br>博士(農学)<br>乙第12659号<br>論農博第2766号<br>新制||農||1003(附属図書館)<br>学位論文||H24||N4700(農学部図書室)<br>29737<br>京都大学大学院農学研究科地域環境科学専攻<br>(主査)教授河地利彦, 教授村上章, 教授川島茂人<br>学位規則第4条第2項該当

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23

Morris, Mark S. "Biodegradation of organic contaminants in subsurface systems: kinetic and metabolic considerations." Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/53592.

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Groundwater contaminated by organic chemicals from industrial spills, leaking underground gasoline storage tanks and landfills has caused concern about the future of a major source of drinking water. Compounds from industrial sources such as alcohols and phenols are frequently found as groundwater contaminants. These compounds are highly soluble in water and do not adsorb well to aquifer material. They also have the potential to migrate in the subsurface system achieving significant levels in drinking water supplies. In addition, they can serve as carriers for carcinogenic compounds such as be

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24

Hickman, Gary T. "Variations in the biodegradation potential of subsurface environments for organic contaminants." Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/53528.

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The purpose of this research was to evaluate the rates, patterns, and pathways involved in the biodegradation of organic contaminants in subsurface environments. Subsurface material was obtained from ten sites in six geographical locations representing diverse environmental conditions. The overall goal was to gain a general understanding of biodegradative mechanisms rather than making site-specific measurements. The biodegradation rates of methanol, phenol, and <i>t</i>-butanol (TBA) were evaluated in static soil/water microcosms. Biodegradation assays were conducted under ambient anoxic cond

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25

Pease, Lindsay Anne. "Characterization of Agricultural Subsurface Drainage Water Quality and Controlled Drainage in the Western Lake Erie Basin." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1461329788.

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26

Jang, Wonyong. "Unsteady multiphase flow modeling of IN-SITU air sparging system in a variable saturated subsurface environment." Available online, Georgia Institute of Technology, 2005, 2005. http://etd.gatech.edu/theses/available/etd-11172005-140745/.

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Thesis (Ph. D.)--Civil and Environmental Engineering, Georgia Institute of Technology, 2006.<br>Dr. Spyros Pavlostathis, Committee Member ; Dr. Mustafa M. Aral, Committee Chair ; Dr. Turgay Uzer, Committee Member ; Dr. Ching-Hua Huang, Committee Member ; Dr. Sotira Yiacoumi, Committee Member. Vita. Includes bibliographical references.

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27

Regmi, Tulsi. "Influence of solids on hydraulic and treatment properties of submerged-flow wetlands /." free to MU campus, to others for purchase, 2000. http://wwwlib.umi.com/cr/mo/fullcit?p9974676.

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28

Shedekar, Vinayak Shamrao. "Developing an integrated, multi-scale modeling system for assessing conservation benefits in subsurface drained watersheds." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1480606965301556.

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29

Bode-Jimenez, Gabriel. "ASSESSMENT OF POTENTIAL IMPACTS TO SUBSURFACE BODIES OF WATER DUE TO UNDERGROUND COAL MINING." UKnowledge, 2017. http://uknowledge.uky.edu/mng_etds/35.

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Underground coal mining operations induce ground movements, which may impact overlying hydrogeologic systems. Potential impacts mainly include changes in the hydraulic conductivity of overlying strata, decreasing of the hydraulic head and changes in water flow. The present research quantifies potential hydrogeologic impacts caused by underground mining through modeling of pre- and post-mining hydrogeologic systems. Three-dimensional conceptual hydrogeologic models were constructed with the Processing Modflow for Windows software package (PMWiN). The models are based on an actual case study, bu

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30

Gorman, Kelsey L. "Root-zone characteristics and bermudagrass response to saline water delivered by subsurface drip irrigation." Connect to this title online, 2009. http://etd.lib.clemson.edu/documents/1246559522/.

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31

Rodríguez-Casas, Julio. "Response of leafy winter vegetables to water and nitrogen inputs under subsurface trickle irrigation." Diss., The University of Arizona, 1994. http://hdl.handle.net/10150/186683.

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Arizona is ranked third in the nation in fresh vegetable production, however, overfertilization and overirrigation have been common practices used to maintain adequate yields and crop quality. Concern for groundwater contamination, water availability and costs have made it necessary to increase water and nitrogen (N) use efficiency. The objectives of this research were: 1. optimize water and N inputs applied through a subsurface trickle irrigation system to leaf lettuce, spinach and collards. 2. evaluate water and N effects on midrib nitrate (NO₃-N) concentration as a tool for monitoring plant

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32

Koelsch, Roger Sebastian. "Effect of floods and recovering aquatic vegetation on surface and subsurface storage processes at Pinal Creek, Globe, Arizona." Thesis, The University of Arizona, 2000. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu_etd_hy0222_sip1_w.pdf&type=application/pdf.

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33

Hanson, Carter Curtis. "Temporal effect on nitrogen removal in a subsurface flow constructed wetland." Virtual Press, 1996. http://liblink.bsu.edu/uhtbin/catkey/1027117.

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A subsurface flow constructed wetland planted with the common reed (Phragmites australis) and softstem bulrush (Scirpus validus) was built in East Central Indiana. The objective of this study was to determine if temperature had an effect on nitrogen (N) removal from the wetland. The research was conducted from the first week of October 3, 1995 to the first week in December 5, 1995 why the wetland froze. Water samples were taken from 5 samplings sites in the system. Each sample was analyzed for organic-N, ammonia, nitrate, and total-N. In the system statistically significant amounts of organic-

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34

Cordeiro, Marcos R. C. "Agronomic and environmental impacts of corn production under different water management strategies in the Canadian Prairies." American Society of Agricultural and Biological Engineers, 2012. http://hdl.handle.net/1993/23218.

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A major challenge facing agriculture is to improve water use and minimize environmental impact while increasing productivity levels. This study, carried out in Winkler, Manitoba, tested four water management treatments: no drainage and no irrigation (NDNI as control), no drainage with overhead irrigation (NDIR), free drainage with overhead irrigation (FDIR), and controlled drainage with subirrigation (CDSI). Each treatment was replicated in three plots during two growing seasons in 2010 and 2011. The monitored variables included soil moisture content, water table depth variation, drainage outf

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35

Baradaran, Ghavami Seyedmohammad. "MTBE gas phase diffusion in subsurface soil : influence of soil water, clay and organic content." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/42088.

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Volatile organic compounds (VOCs) have adverse effects on human health upon short- and long-term exposure, causing allergy and asthma in adults and respiratory problems and immune system disorders in children. The most important mechanisms responsible for VOC migration and deposition in soil include diffusion, advection, adsorption, biodegradation and chemical reaction. MTBE (Methyl Tertiary-Butyl Ether), a very common VOC, detected in groundwater near landfills and hazardous waste dumps, can cause cancer in humans. Due to its specific physical and chemical properties such as high volatility,

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36

Havard, Peter. "Linkflow, a linked saturated-unsaturated water flow computer model for drainage and subirrigation." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=41608.

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A computer simulation model, LINKFLOW, has been developed to simulate the movement of water during various water table management practices, such as subsurface drainage, controlled drainage and subirrigation. Water movement is simulated to, or from, a buried tile drainage system through a heterogeneous and anisotropic soil to a zone of water extraction by plant roots and the atmosphere. The computer package links a newly-developed one-dimensional unsaturated ground water flow model to a three-dimensional saturated water flow model that was modified for the linkage and for simulating water flow

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37

Cook, Amy. "Development of an Integrated Surface and Subsurface Model of Everglades National Park." FIU Digital Commons, 2012. http://digitalcommons.fiu.edu/etd/634.

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An integrated surface-subsurface hydrological model of Everglades National Park (ENP) was developed using MIKE SHE and MIKE 11 modeling software. The model has a resolution of 400 meters, covers approximately 1050 square miles of ENP, includes 110 miles of drainage canals with a variety of hydraulic structures, and processes hydrological information, such as evapotranspiration, precipitation, groundwater levels, canal discharges and levels, and operational schedules. Calibration was based on time series and probability of exceedance for water levels and discharges in the years 1987 through 199

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38

Womack, Michael. "Temporal effects on orhophosphate removal from municipal wastewater in a subsurface-flow constructed wetland." Virtual Press, 1996. http://liblink.bsu.edu/uhtbin/catkey/1020163.

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Orthophosphate removal from wastewater in a subsurface-flow constructed wetland (SFCW) was studied during the fall of 1995. The SFCW consisted of a cell with an impervious liner, filled with 1.27 to 3.81 cm river rock and planted with common reeds (Phragmites australis) and soft-stem bulrushes (Scirpus validus). Municipal wastewater was pumped through the wetland and comparisons were made between inlet and outlet orthophosphate concentrations. Comparisons were also made at locations within the cell. A mean orthophosphate reduction of 62% with a range of 91% to 32% was observed for the duration

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39

Ellison, Mary. "Subsurface controls on mainland marsh shoreline response during barrier island transgressive submergence." ScholarWorks@UNO, 2011. http://scholarworks.uno.edu/td/458.

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Many recent studies have sought to understand the response of barrier islands and their attendant marshes to sea level rise. The Mississippi River delta plain, specifically the Chandeleur Islands and associated interior wetlands in eastern Louisiana, serves as an excellent natural laboratory for studying these responses. This region is presently undergoing the highest rates of shoreline erosion (> 15 m yr -1) in North America as wetlands are converted to open water in a regime of subsidence-driven rapid relative sea-level rise (~1 cm yr-1). Three conceptual models were developed based on the g

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40

Papineau, France. "Land and water appraisal for irrigation in Richelieu and St-Hyacinthe counties, Quebec." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61275.

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Suitable areas for subirrigation and sprinkler irrigation were identified in Richelieu and St-Hyacinthe counties.<br>Land suitable for subirrigation includes uniform sandy textured profiles deeper than 1 m, with hydraulic conductivities greater than 0.5 m/d and lying on a clay layer at approximately 2 m from the surface, and with slopes less than 0.5% and little or no microrelief.<br>Soils that failed to satisfy the subirrigation criteria and that would most benefit from sprinkler irrigation were identified. These soils had available water holding capacities of less than 7.5 cm per 100 cm of s

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Shaqadan, Ashraf. "Decision Analysis Considering Welfare Impacts in Water Resources Using the Benefit Transfer Approach." DigitalCommons@USU, 2008. https://digitalcommons.usu.edu/etd/54.

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Decision making in environmental management is faced with uncertainties associated with related environmental variables and processes. Decision makers are inclined to use resources to acquire better information in one or more uncertain variable(s). Typically, with limited resources available, characterizing the feasibility of such investment is desirable yet complicated. In the context of reducing inherent uncertainty, decision makers need to tackle two difficult questions, first, the optimal selection of variable(s) and second, the optimal level of information collection which produces maximu

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42

Calhoon, Emily B. W. "Vegetation and hydrologic influences on carbon and nitrogen in subsurface water of a forested riparian wetland /." Available online. Click here, 2005. http://sunshine.lib.mtu.edu/ETD/THESIS/calhoone/thesis.pdf.

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43

Tse, Man Kit. "Influence of stress states on soil-water characteristics, conjunctive surface-subsurface flow modelling and stability analysis /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202007%20TSE.

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44

Schima, Susan Anastasia 1969. "Monitoring air flow and water movement in the subsurface with cross-borehole resistivity and induced polarization." Thesis, The University of Arizona, 1994. http://hdl.handle.net/10150/192085.

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The research included in this thesis consists of the following two geophysical surveys: a cross-borehole resistivity and induced polarization tomography survey to track the flow of water in the unsaturated zone at Avra Valley, Arizona; and a cross-borehole resistivity tomography survey to monitor air flow resulting from air sparging in the saturated zone in Florence, Oregon. In Avra Valley, the resistivity decreases from background values in the areas saturated by the injected water, while the IP in these saturated areas increases, indicating that salts may have been flushed out by the descend

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Pier, J. W., T. A. Doerge, J. L. Stroehlein, and T. McCreary. "Nitrogen and Water Effects on Yield, Quality and Tissue Nitrate Concentration in Subsurface Trickle Irrigated Melons." College of Agriculture, University of Arizona (Tucson, AZ), 1991. http://hdl.handle.net/10150/221438.

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Rising water costs and concern for groundwater contamination are encouraging growers to improve irrigation and fertilization efficiency. The objectives of this study were to determine water and fertilizer nitrogen (N) rates leading to optimum yield and harvest quality and to develop a plant tissue test to aid in melon nitrogen fertilization. In 1990, a field experiment consisting of a complete 3x3 factorial arrangement of optimum, sub- and super-optimum rates of urea ammonium- nitrate and water applied through a subsurface trickle irrigation system to cantaloupe, honeyloupe and watermelon was

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McFarland, Lynn Margaret. "Using the chemical and isotopic characteristics of drinking water to determine sources of potable water and subsurface geologic controls on water chemistry, Stoney Indian Reserve, Morley, Alberta." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq20840.pdf.

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Bournival, Pierre. "Head losses and water distribution in a sandy loam soil with a subirrigation system." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=64034.

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Tangpithakkul, Rawee. "Study of permeability of pavement base materials." Ohio University / OhioLINK, 1997. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1184344573.

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Gonçalves, Marta Filipa Dores Martins. "Influência da rega subsuperficial e gota-a-gota na utilização da água , qualidade e produção em pereira (Pyrus communis L.) Rocha. Estudo preliminar." Master's thesis, ISA, 2010. http://hdl.handle.net/10400.5/6560.

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Mestrado em Engenharia Agronómica - Instituto Superior de Agronomia<br>With the aim of comparing the physiologic response, the quality of the fruits and water productivity of a pear orchard irrigated by two different irrigation systems, a field trial was conducted on a 4 year old „Rocha‟ / Sydo pear orchard, irrigated by surface drip and subsurface drip irrigation, during the year 2009/2010. There are no differences in the flower bloom and fruit setting, sugar content and acidity of the fruits between the two irrigation systems, but the surface drip irrigation produced a larger percentage of f

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Hussien, Tarig M. Hamad. "Formation evaluation of deep-water reservoirs in the 13A and 14A sequences of the Central Bredasdorp Basin, offshore South Africa." University of the Western Cape, 2014. http://hdl.handle.net/11394/4876.

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>Magister Scientiae - MSc<br>The goal of this study is to enhance the evaluation of subsurface reservoirs by improving the prediction of petrophysical parameters through the integration of wireline logs and core measurements. Formation evaluations of 13A and 14A sequences in the Bredasdorp Basin, offshore South Africa have been performed. Five wells in the central area of the basin have been selected for this study. Four different lithofacies (A, B, C, D) were identified, in the two cored wells, and used to predict the lithofacies from wireline logs in uncored intervals and wells. A method ba

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