{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/21852"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/21852","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Interpretation of shallow geothermal surveys","abstract":"Over the last several decades, the shallow temperature survey has been developed as a surface geophysical method in ground water and geothermal energy exploration. Advances in numerical modeling techniques have made it possible to build a realistic model of the shallow subsurface. In particular, variable hydraulic and thermal properties can be included in models which couple moisture and heat processes in multi-dimensions.","abstract_html":"Over the last several decades, the shallow temperature survey has been developed as a surface geophysical method in ground water and geothermal energy exploration. Advances in numerical modeling techniques have made it possible to build a realistic model of the shallow subsurface. In particular, variable hydraulic and thermal properties can be included in models which couple moisture and heat processes in multi-dimensions.","abstract_has_math":false,"creators":["Larson, Timothy Howe"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Geology","degree_department":null,"school":null,"contributors":["Hsui, Albert T."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T13:21:07Z","date_published":"2011-05-07T13:21:07Z","updated_at":"2026-07-22T22:25:18Z","subjects":["Geology","Geophysics","Hydrology"],"languages":["eng"],"rights":["Copyright 1990 Larson, Timothy Howe"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9021714","(UMI)AAI9021714"],"render_values":[{"text":"AAI9021714","href":null,"code":true},{"text":"(UMI)AAI9021714","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/21852","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Hsui, Albert T."]},{"key":"dc:creator","label":"Author","values":["Larson, Timothy Howe"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T13:21:07Z","10000-01-01","1990"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Geology"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Geology","Geophysics","Hydrology"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1990 Larson, Timothy Howe"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9021714","(UMI)AAI9021714","http://hdl.handle.net/2142/21852"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Over the last several decades, the shallow temperature survey has been developed as a surface geophysical method in ground water and geothermal energy exploration. Advances in numerical modeling techniques have made it possible to build a realistic model of the shallow subsurface. In particular, variable hydraulic and thermal properties can be included in models which couple moisture and heat processes in multi-dimensions.","Coupled thermal and moisture transport equations were solved using an integrated finite difference method to simulate both one-dimensional profiles and two-dimensional cross sections. The two-dimensional model simulated a cross-section through a portion of the Sheffield low-level radioactive waste disposal site, Bureau Co., Illinois. Material properties are from laboratory data and generic values. Factors investigated include surface moisture boundary conditions, material thermal properties, layering, variable moisture content and topographic changes.","Of those studied, the most important factor affecting the temperature at 1.0 m depth is the thermal conductivity of the material within the first meter of the subsurface. Advective flux will be measurable when the soils are moist and have a hydraulic conductivity of about 10$\\sp{-5}$ cm/s or greater. Vapor flux will be measurable only when the soil is relatively dry, having a soil pressure gradient of at least 10$\\sp3$ cm/cm. For example, in the first 2 weeks following a summer storm, advective flux will result in a slight warming of the soil. Following the passage of the moisture front, evapotranspiration will cause a relative cooling of the soil.","Shallow thermal structures are also sensitive to local, topographically driven ground water flows. Advective flux can be expected to increase when the topographic gradient increases. However, in soils with high hydraulic conductivity, the effect can be more accurately predicted based on the slope of the water table.","Soil temperatures at 1.0 or 2.0 m depth should be measured with a precision of 0.01$\\sp\\circ$C. If possible, thermal conductivities of the shallow materials should also be obtained. Using these data, and available weather information, quantitative interpretation based on numerical models is feasible.","Made available in DSpace on 2011-05-07T13:21:07Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9021714.pdf: 5686063 bytes, checksum: b073c079eaa69db0e587d91f530e0f5b (MD5) Previous issue date: 1990","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:53:38Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:24:50-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"]},{"key":"dc:title","label":"Title","values":["Interpretation of shallow geothermal surveys"]}]}],"canonical_facts":{"dc:contributor":["Hsui, Albert T."],"dc:creator":["Larson, Timothy Howe"],"dc:date":["2011-05-07T13:21:07Z","10000-01-01","1990"],"dc:description":["Over the last several decades, the shallow temperature survey has been developed as a surface geophysical method in ground water and geothermal energy exploration. Advances in numerical modeling techniques have made it possible to build a realistic model of the shallow subsurface. In particular, variable hydraulic and thermal properties can be included in models which couple moisture and heat processes in multi-dimensions.","Coupled thermal and moisture transport equations were solved using an integrated finite difference method to simulate both one-dimensional profiles and two-dimensional cross sections. The two-dimensional model simulated a cross-section through a portion of the Sheffield low-level radioactive waste disposal site, Bureau Co., Illinois. Material properties are from laboratory data and generic values. Factors investigated include surface moisture boundary conditions, material thermal properties, layering, variable moisture content and topographic changes.","Of those studied, the most important factor affecting the temperature at 1.0 m depth is the thermal conductivity of the material within the first meter of the subsurface. Advective flux will be measurable when the soils are moist and have a hydraulic conductivity of about 10$\\sp{-5}$ cm/s or greater. Vapor flux will be measurable only when the soil is relatively dry, having a soil pressure gradient of at least 10$\\sp3$ cm/cm. For example, in the first 2 weeks following a summer storm, advective flux will result in a slight warming of the soil. Following the passage of the moisture front, evapotranspiration will cause a relative cooling of the soil.","Shallow thermal structures are also sensitive to local, topographically driven ground water flows. Advective flux can be expected to increase when the topographic gradient increases. However, in soils with high hydraulic conductivity, the effect can be more accurately predicted based on the slope of the water table.","Soil temperatures at 1.0 or 2.0 m depth should be measured with a precision of 0.01$\\sp\\circ$C. If possible, thermal conductivities of the shallow materials should also be obtained. Using these data, and available weather information, quantitative interpretation based on numerical models is feasible.","Made available in DSpace on 2011-05-07T13:21:07Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9021714.pdf: 5686063 bytes, checksum: b073c079eaa69db0e587d91f530e0f5b (MD5) Previous issue date: 1990","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:53:38Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:24:50-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"],"dc:identifier":["AAI9021714","(UMI)AAI9021714","http://hdl.handle.net/2142/21852"],"dc:language":["eng"],"dc:rights":["Copyright 1990 Larson, Timothy Howe"],"dc:subject":["Geology","Geophysics","Hydrology"],"dc:title":["Interpretation of shallow geothermal surveys"],"dc:type":["text"],"thesis:degree_discipline":["Geology"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:18Z"}