{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/105944"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/105944","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Numerical modeling of groundwater-driven stream network evolution in low-relief areas","abstract":"Fluvial channel networks are observed to grow in unchannelized areas of low relief despite the low potential energy for erosion in these areas of low slope. Under these low slope conditions significant channel growth only occurs when water is collected and flows as concentrated discharge in specific areas. Previous work examined how surface water routing out of closed depressions on the landscape could produce concentrated discharge to drive channel incision. We propose that water could be routed underground to feed growing channels and numerically model the contribution of groundwater contribution to stream development. Our results show that groundwater seepage steepens river long profiles, and moderate groundwater contributions (< 25% of total water) increase the rate of channel growth relative to cases with only surface water. Groundwater input also promotes branching near the groundwater seeps. These results indicate that we cannot disregard groundwater as a potentially significant contributor to stream evolution in low-relief areas. In particular, we suggest that groundwater seepage could have played a significant role in post-glacial stream development of the Central Lowlands of the United States.","abstract_html":"Fluvial channel networks are observed to grow in unchannelized areas of low relief despite the low potential energy for erosion in these areas of low slope. Under these low slope conditions significant channel growth only occurs when water is collected and flows as concentrated discharge in specific areas. Previous work examined how surface water routing out of closed depressions on the landscape could produce concentrated discharge to drive channel incision. We propose that water could be routed underground to feed growing channels and numerically model the contribution of groundwater contribution to stream development. Our results show that groundwater seepage steepens river long profiles, and moderate groundwater contributions (&lt; 25% of total water) increase the rate of channel growth relative to cases with only surface water. Groundwater input also promotes branching near the groundwater seeps. These results indicate that we cannot disregard groundwater as a potentially significant contributor to stream evolution in low-relief areas. In particular, we suggest that groundwater seepage could have played a significant role in post-glacial stream development of the Central Lowlands of the United States.","abstract_has_math":false,"creators":["Cullen, Cecilia"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Geology","degree_department":null,"school":null,"contributors":["Anders, Alison","Druhan, Jennifer"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2019,"date_issued":"2019-11-26T20:59:48Z","date_published":"2019-11-26T20:59:48Z","updated_at":"2026-07-22T22:24:45Z","subjects":["Rivers, Landscape-evolution"],"languages":["en"],"rights":["Copyright 2019 Cecilia Cullen"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/105944","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Anders, Alison","Druhan, Jennifer"]},{"key":"dc:creator","label":"Author","values":["Cullen, Cecilia"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2019-11-26T20:59:48Z","2021-11-27T10:15:27Z","2019-07-15","2019-08"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Geology"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"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":["Rivers, Landscape-evolution"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2019 Cecilia Cullen"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/105944"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Fluvial channel networks are observed to grow in unchannelized areas of low relief despite the low potential energy for erosion in these areas of low slope. Under these low slope conditions significant channel growth only occurs when water is collected and flows as concentrated discharge in specific areas. Previous work examined how surface water routing out of closed depressions on the landscape could produce concentrated discharge to drive channel incision. We propose that water could be routed underground to feed growing channels and numerically model the contribution of groundwater contribution to stream development. Our results show that groundwater seepage steepens river long profiles, and moderate groundwater contributions (< 25% of total water) increase the rate of channel growth relative to cases with only surface water. Groundwater input also promotes branching near the groundwater seeps. These results indicate that we cannot disregard groundwater as a potentially significant contributor to stream evolution in low-relief areas. In particular, we suggest that groundwater seepage could have played a significant role in post-glacial stream development of the Central Lowlands of the United States.","Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2021-08-01","The student, Cecilia Cullen, accepted the attached license on 2019-07-12 at 10:06.","The student, Cecilia Cullen, submitted this Thesis for approval on 2019-07-12 at 10:13.","This Thesis was approved for publication on 2019-07-15 at 14:49.","DSpace SAF Submission Ingestion Package generated from Vireo submission #14297 on 2019-11-26 at 14:04:11","Made available in DSpace on 2019-11-26T20:59:48Z (GMT). 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Under these low slope conditions significant channel growth only occurs when water is collected and flows as concentrated discharge in specific areas. Previous work examined how surface water routing out of closed depressions on the landscape could produce concentrated discharge to drive channel incision. We propose that water could be routed underground to feed growing channels and numerically model the contribution of groundwater contribution to stream development. Our results show that groundwater seepage steepens river long profiles, and moderate groundwater contributions (< 25% of total water) increase the rate of channel growth relative to cases with only surface water. Groundwater input also promotes branching near the groundwater seeps. These results indicate that we cannot disregard groundwater as a potentially significant contributor to stream evolution in low-relief areas. In particular, we suggest that groundwater seepage could have played a significant role in post-glacial stream development of the Central Lowlands of the United States.","Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2021-08-01","The student, Cecilia Cullen, accepted the attached license on 2019-07-12 at 10:06.","The student, Cecilia Cullen, submitted this Thesis for approval on 2019-07-12 at 10:13.","This Thesis was approved for publication on 2019-07-15 at 14:49.","DSpace SAF Submission Ingestion Package generated from Vireo submission #14297 on 2019-11-26 at 14:04:11","Made available in DSpace on 2019-11-26T20:59:48Z (GMT). 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