{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/101494"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/101494","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Laboratory experiments on alluvial cover in mixed bedrock-alluvial meandering channels and on the formation and evolution of supraglacial meltwater meandering streams","abstract":"Rivers and other channels containing liquid flow develop meandering patterns over different media and across a broad range of scales. For example, alluvial rivers form and evolve by erosion and deposition of sediment, and by interactions with riparian vegetation. Meandering channels also form in bedrock where the driving processes include dissolution, abrasion by sediment particles, plucking of bedrock, and weathering. Rivulets on a plane can also meander due to an instability associated with surface tension, and channelized flows over ice surfaces also develop meandering patterns due to differential melting. In spite of the differences in size and underlying mechanisms, similarities in planform and channel morphology exist across media and scale, suggesting that there is a common underlying framework of river meandering. This dissertation focuses in two types of meandering channels, namely, mixed bedrock-alluvial meandering channels, and meltwater meandering channels. Experimental work was conducted to advance the current understanding of the processes and characteristics of these two types of meandering rivers. Specifically, this dissertation answers the following questions: 1. How does alluvial cover, as it relates to sediment supply and channel curvature, affect the zones of potential erosion in mixed bedrock-alluvial meandering rivers? 2. What is the role of alluvial cover fluctuations in erosion in mixed bedrock-alluvial meandering channels? 3. How does hydraulic roughness in a bedrock river change under different sediment supply scenarios and how do these changes relate to the ratio of areal alluvial cover to total bed area averaged over a reach? 4. How can the composite roughness, including the effect of bedrock and alluvium in a channel of complex shape, be better described and quantified so as to inform numerical models? 5. How do meltwater meandering channels form and evolve? 6. What are the characteristics of meltwater meandering channels and what is the degree of similarity between them and meandering channels in other media?","abstract_html":"Rivers and other channels containing liquid flow develop meandering patterns over different media and across a broad range of scales. For example, alluvial rivers form and evolve by erosion and deposition of sediment, and by interactions with riparian vegetation. Meandering channels also form in bedrock where the driving processes include dissolution, abrasion by sediment particles, plucking of bedrock, and weathering. Rivulets on a plane can also meander due to an instability associated with surface tension, and channelized flows over ice surfaces also develop meandering patterns due to differential melting. In spite of the differences in size and underlying mechanisms, similarities in planform and channel morphology exist across media and scale, suggesting that there is a common underlying framework of river meandering. This dissertation focuses in two types of meandering channels, namely, mixed bedrock-alluvial meandering channels, and meltwater meandering channels. Experimental work was conducted to advance the current understanding of the processes and characteristics of these two types of meandering rivers. Specifically, this dissertation answers the following questions: 1. How does alluvial cover, as it relates to sediment supply and channel curvature, affect the zones of potential erosion in mixed bedrock-alluvial meandering rivers? 2. What is the role of alluvial cover fluctuations in erosion in mixed bedrock-alluvial meandering channels? 3. How does hydraulic roughness in a bedrock river change under different sediment supply scenarios and how do these changes relate to the ratio of areal alluvial cover to total bed area averaged over a reach? 4. How can the composite roughness, including the effect of bedrock and alluvium in a channel of complex shape, be better described and quantified so as to inform numerical models? 5. How do meltwater meandering channels form and evolve? 6. What are the characteristics of meltwater meandering channels and what is the degree of similarity between them and meandering channels in other media?","abstract_has_math":false,"creators":["Fernandez Arrieta, Roberto"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Civil Engineering","degree_department":null,"school":null,"contributors":["Parker, Gary","Garcia, Marcelo H.","Rhoads, Bruce","Venditti, Jeremy"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2018,"date_issued":"2018-09-27T16:17:26Z","date_published":"2018-09-27T16:17:26Z","updated_at":"2026-07-22T22:24:40Z","subjects":["meander","bedrock","alluvial","cover","supraglacial","meltwater","experiments"],"languages":["en"],"rights":["Copyright 2018 Roberto Fernandez Arrieta"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/101494","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Parker, Gary","Garcia, Marcelo H.","Rhoads, Bruce","Venditti, Jeremy"]},{"key":"dc:creator","label":"Author","values":["Fernandez Arrieta, Roberto"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2018-09-27T16:17:26Z","2018-06-20","2018-08"]},{"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":["meander","bedrock","alluvial","cover","supraglacial","meltwater","experiments"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2018 Roberto Fernandez Arrieta"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/101494"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Rivers and other channels containing liquid flow develop meandering patterns over different media and across a broad range of scales. For example, alluvial rivers form and evolve by erosion and deposition of sediment, and by interactions with riparian vegetation. Meandering channels also form in bedrock where the driving processes include dissolution, abrasion by sediment particles, plucking of bedrock, and weathering. Rivulets on a plane can also meander due to an instability associated with surface tension, and channelized flows over ice surfaces also develop meandering patterns due to differential melting. In spite of the differences in size and underlying mechanisms, similarities in planform and channel morphology exist across media and scale, suggesting that there is a common underlying framework of river meandering. This dissertation focuses in two types of meandering channels, namely, mixed bedrock-alluvial meandering channels, and meltwater meandering channels. Experimental work was conducted to advance the current understanding of the processes and characteristics of these two types of meandering rivers. Specifically, this dissertation answers the following questions: 1. How does alluvial cover, as it relates to sediment supply and channel curvature, affect the zones of potential erosion in mixed bedrock-alluvial meandering rivers? 2. What is the role of alluvial cover fluctuations in erosion in mixed bedrock-alluvial meandering channels? 3. How does hydraulic roughness in a bedrock river change under different sediment supply scenarios and how do these changes relate to the ratio of areal alluvial cover to total bed area averaged over a reach? 4. How can the composite roughness, including the effect of bedrock and alluvium in a channel of complex shape, be better described and quantified so as to inform numerical models? 5. How do meltwater meandering channels form and evolve? 6. What are the characteristics of meltwater meandering channels and what is the degree of similarity between them and meandering channels in other media?","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2018-09-27 without embargo terms","The student, Roberto Fernandez Arrieta, accepted the attached license on 2018-06-16 at 23:53.","The student, Roberto Fernandez Arrieta, submitted this Dissertation for approval on 2018-06-17 at 07:13.","This Dissertation was approved for publication on 2018-06-20 at 11:01.","DSpace SAF Submission Ingestion Package generated from Vireo submission #12637 on 2018-09-27 at 10:44:51","Made available in DSpace on 2018-09-27T16:17:26Z (GMT). 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Specifically, this dissertation answers the following questions: 1. How does alluvial cover, as it relates to sediment supply and channel curvature, affect the zones of potential erosion in mixed bedrock-alluvial meandering rivers? 2. What is the role of alluvial cover fluctuations in erosion in mixed bedrock-alluvial meandering channels? 3. How does hydraulic roughness in a bedrock river change under different sediment supply scenarios and how do these changes relate to the ratio of areal alluvial cover to total bed area averaged over a reach? 4. How can the composite roughness, including the effect of bedrock and alluvium in a channel of complex shape, be better described and quantified so as to inform numerical models? 5. How do meltwater meandering channels form and evolve? 6. What are the characteristics of meltwater meandering channels and what is the degree of similarity between them and meandering channels in other media?","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2018-09-27 without embargo terms","The student, Roberto Fernandez Arrieta, accepted the attached license on 2018-06-16 at 23:53.","The student, Roberto Fernandez Arrieta, submitted this Dissertation for approval on 2018-06-17 at 07:13.","This Dissertation was approved for publication on 2018-06-20 at 11:01.","DSpace SAF Submission Ingestion Package generated from Vireo submission #12637 on 2018-09-27 at 10:44:51","Made available in DSpace on 2018-09-27T16:17:26Z (GMT). No. of bitstreams: 3 FERNANDEZARRIETA-DISSERTATION-2018.pdf: 9621242 bytes, checksum: 1f6655e64b80ba140d299810225fe304 (MD5) LICENSE.txt: 4222 bytes, checksum: 074f1909e3a119d677a748157207f16a (MD5) PROQUEST_LICENSE.txt: 4568 bytes, checksum: 636dd5d9217afde3593330e8c7a46a32 (MD5) Previous issue date: 2018-06-20"],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/2142/101494"],"dc:language":["en"],"dc:rights":["Copyright 2018 Roberto Fernandez Arrieta"],"dc:subject":["meander","bedrock","alluvial","cover","supraglacial","meltwater","experiments"],"dc:title":["Laboratory experiments on alluvial cover in mixed bedrock-alluvial meandering channels and on the formation and evolution of supraglacial meltwater meandering streams"],"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":"2026-07-22T22:24:40Z"}