{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/101678"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/101678","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Simple numerical models for fluvially-dominant river deltas","abstract":"Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2020-08-01","abstract_html":"Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2020-08-01","abstract_has_math":false,"creators":["Czapiga, Matthew J"],"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","Best, Jim","Tinoco, Rafael","Viparelli, Enrica","Mohrig, David"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2018,"date_issued":"2018-07-06","date_published":"2018-07-06","updated_at":"2026-07-22T22:24:40Z","subjects":["River, Delta, Morphodynamics"],"languages":["en"],"rights":["Copyright 2018 Matthew J. 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This closure improves on previous models that assumed a constant value for this term or used a biased regression scheme. By including this extra constraint, 1D models can simultaneously predict channel width and channel elevation changes, where the former is predicted based on physically-based trends of rivers near morphodynamic-equilibrium. New, juvenile channels are formed at the delta periphery and we find that young channels relate to a formative bankfull Shields number that linearly scales to our empirical relation. A new distributed Exner formulation is included that accounts for channel and floodplain elevations along with a geometric mean delta elevation. This addition allows for a basement incision modelling, which is relevant for river deltas growing into shallow, low slope basins, which commonly erode into the pre-delta surface. The incision submodel includes a below-capacity sediment transport framework and a rate-law function for cohesive sediment erosion. Hindcast model runs compared against the evolution of Wax Lake Delta, Louisiana, USA suggest the new features improve the model’s ability to predict width and depth trends over a 35-year period. A second model is introduced that investigates the effect of juvenile channels on the ability to export sediment from the delta topset. This model convolves a spatial bifurcation rate and flow losses related to juvenile channels to induce declining sediment transport down delta; the model is normalized by upstream variables and all variables are defined by only two parameters. Results are compared against volumetric changes of the Wax Lake Delta topset and the model reasonably well predicts channel properties. An exploration of parameter space for these variables indicates the conditions necessary for sediment trapping in any generic fluvially dominant delta.","DSpace SAF Submission Ingestion Package generated from Vireo submission #12740 on 2018-09-27 at 11:16:34","Made available in DSpace on 2018-09-27T16:30:18Z (GMT). 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The incision submodel includes a below-capacity sediment transport framework and a rate-law function for cohesive sediment erosion. Hindcast model runs compared against the evolution of Wax Lake Delta, Louisiana, USA suggest the new features improve the model’s ability to predict width and depth trends over a 35-year period. A second model is introduced that investigates the effect of juvenile channels on the ability to export sediment from the delta topset. This model convolves a spatial bifurcation rate and flow losses related to juvenile channels to induce declining sediment transport down delta; the model is normalized by upstream variables and all variables are defined by only two parameters. Results are compared against volumetric changes of the Wax Lake Delta topset and the model reasonably well predicts channel properties. 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