{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/22084"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/22084","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Low flow mixing in open channels","abstract":"In problems involving water quality and pollution in natural streams under low flow conditions, during which pollution problems are most acute, a complete understanding of the effects of variations of flow and channel geometry on mixing and transport of polluted releases is necessary to establish sound water pollution control programs as well as water resources management programs.","abstract_html":"In problems involving water quality and pollution in natural streams under low flow conditions, during which pollution problems are most acute, a complete understanding of the effects of variations of flow and channel geometry on mixing and transport of polluted releases is necessary to establish sound water pollution control programs as well as water resources management programs.","abstract_has_math":false,"creators":["Seo, Il Won"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Civil Engineering","degree_department":null,"school":null,"contributors":["Maxwell, W.H.C."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T13:28:26Z","date_published":"2011-05-07T13:28:26Z","updated_at":"2026-07-22T22:25:19Z","subjects":["Engineering, Civil","Environmental Sciences"],"languages":["eng"],"rights":["Copyright 1990 Seo, Il Won"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(UMI)AAI9026317","AAI9026317"],"render_values":[{"text":"(UMI)AAI9026317","href":null,"code":true},{"text":"AAI9026317","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/22084","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Maxwell, W.H.C."]},{"key":"dc:creator","label":"Author","values":["Seo, Il Won"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T13:28:26Z","10000-01-01","1990"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Civil Engineering"]},{"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":["Engineering, Civil","Environmental Sciences"]}]},{"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 Seo, Il Won"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["(UMI)AAI9026317","http://hdl.handle.net/2142/22084","AAI9026317"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["In problems involving water quality and pollution in natural streams under low flow conditions, during which pollution problems are most acute, a complete understanding of the effects of variations of flow and channel geometry on mixing and transport of polluted releases is necessary to establish sound water pollution control programs as well as water resources management programs.","In this research, a systematic and comprehensive study of the effects of variations of flow and channel geometry on mixing and transport of polluted releases in natural streams under low flow conditions has been conducted. The non-Fickian nature of the low flow mixing in natural channels has been investigated using both laboratory experiments and the numerical solution of the proposed mathematical model which is based on a set of mass balance equations describing the mixing and mass exchange mechanisms, in which the effect of channel storage zones was included.","Laboratory experiments, which involved collection of channel geometry, hydraulic, and dye dispersion test data, were conducted to obtain sets of experimental data on a model of four pool and riffle sequences in a 161-ft long tilting flume in the Hydrosystems Laboratory at the University of Illinois at Urbana-Champaign. The experimental results indicate that the flow over the model pool-riffle sequences is highly non-uniform. Concentration-time curves are significantly skewed with long tails. The measured dispersion coefficients and the mass exchange coefficients are close to those measured by previous investigators.","The mixing and dispersion in the laboratory channel was simulated using a numerical solution of the proposed mathematical model in which the 6-point finite difference method developed by Stone and Brian was used as a solution technique. The comparison between the measured and predicted concentration-time curves shows that there is a good level of agreement in the general shape, peak concentrations and time to peak. The proposed model shows significant improvement over the conventional Fickian model in predicting the dispersion process in natural channels under low flow conditions.","Made available in DSpace on 2011-05-07T13:28:26Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9026317.pdf: 9203219 bytes, checksum: 757859ee110432a66b081f325c0a4114 (MD5) Previous issue date: 1990","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:55:13Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:25:43-05:00 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":["Low flow mixing in open channels"]}]}],"canonical_facts":{"dc:contributor":["Maxwell, W.H.C."],"dc:creator":["Seo, Il Won"],"dc:date":["2011-05-07T13:28:26Z","10000-01-01","1990"],"dc:description":["In problems involving water quality and pollution in natural streams under low flow conditions, during which pollution problems are most acute, a complete understanding of the effects of variations of flow and channel geometry on mixing and transport of polluted releases is necessary to establish sound water pollution control programs as well as water resources management programs.","In this research, a systematic and comprehensive study of the effects of variations of flow and channel geometry on mixing and transport of polluted releases in natural streams under low flow conditions has been conducted. The non-Fickian nature of the low flow mixing in natural channels has been investigated using both laboratory experiments and the numerical solution of the proposed mathematical model which is based on a set of mass balance equations describing the mixing and mass exchange mechanisms, in which the effect of channel storage zones was included.","Laboratory experiments, which involved collection of channel geometry, hydraulic, and dye dispersion test data, were conducted to obtain sets of experimental data on a model of four pool and riffle sequences in a 161-ft long tilting flume in the Hydrosystems Laboratory at the University of Illinois at Urbana-Champaign. The experimental results indicate that the flow over the model pool-riffle sequences is highly non-uniform. Concentration-time curves are significantly skewed with long tails. The measured dispersion coefficients and the mass exchange coefficients are close to those measured by previous investigators.","The mixing and dispersion in the laboratory channel was simulated using a numerical solution of the proposed mathematical model in which the 6-point finite difference method developed by Stone and Brian was used as a solution technique. The comparison between the measured and predicted concentration-time curves shows that there is a good level of agreement in the general shape, peak concentrations and time to peak. The proposed model shows significant improvement over the conventional Fickian model in predicting the dispersion process in natural channels under low flow conditions.","Made available in DSpace on 2011-05-07T13:28:26Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9026317.pdf: 9203219 bytes, checksum: 757859ee110432a66b081f325c0a4114 (MD5) Previous issue date: 1990","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:55:13Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:25:43-05:00 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":["(UMI)AAI9026317","http://hdl.handle.net/2142/22084","AAI9026317"],"dc:language":["eng"],"dc:rights":["Copyright 1990 Seo, Il Won"],"dc:subject":["Engineering, Civil","Environmental Sciences"],"dc:title":["Low flow mixing in open channels"],"dc:type":["text"],"thesis:degree_discipline":["Civil Engineering"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:19Z"}