{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/125701"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/125701","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Analysis of the effects of coherent flow structures on the transport of particles around submerged obstacles in streams","abstract":"Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-08-01","abstract_html":"Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-08-01","abstract_has_math":false,"creators":["You, Hojung"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Civil Engineering","degree_department":null,"school":null,"contributors":["Tinoco, Rafael O.","Garcia, Marcelo H.","Chamorro, Leonardo P.","Escauriaza, Cristian","Pujara, Nimish"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2024,"date_issued":"2024-07-10","date_published":"2024-07-10","updated_at":"2026-07-22T22:25:02Z","subjects":["Particle Transport","Turbulence","Piv","Coherent Structure"],"languages":["en","eng"],"rights":["Copyright 2024 Hojung You"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/2142/125701","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Tinoco, Rafael O.","Garcia, Marcelo H.","Chamorro, Leonardo P.","Escauriaza, Cristian","Pujara, Nimish"]},{"key":"dc:creator","label":"Author","values":["You, Hojung"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2024-07-10","2024-08"]},{"key":"dc:type","label":"Dc Type","values":["text","Thesis"]},{"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":["Particle Transport","Turbulence","Piv","Coherent Structure"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en","eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2024 Hojung You"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://hdl.handle.net/2142/125701"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-08-01","The student, Hojung You, accepted the attached license on 2024-07-08 at 13:31.","The student, Hojung You, submitted this Dissertation for approval on 2024-07-08 at 13:41.","This Dissertation was approved for publication on 2024-07-10 at 16:06.","DSpace SAF Submission Ingestion Package generated from Vireo submission #20983 on 2025-02-04 at 21:16:29","Freshwaters transport various types of particulate matter, from plant seeds, fish eggs, and drifting invertebrates, to particles that can be harmful for aquatic biota, such as plastic debris, including macro-, meso-, and microplastics. Common obstacles in freshwater such as branches, logs and hydraulic structures are identified as local hotspots of various types of particles. Hydrodynamic analysis of these locations will provide a more efficient approach to capture and redirect particles in freshwater ecosystems by predicting particle trajectories under different flow conditions. In this research, we identify flow characteristics that create hotspots of particles, and study the interaction between flow and particles with various obstacle configurations and particle characteristics in a laboratory setting. The transport mechanisms of particles are analyzed as a function of spacing between neighboring obstacles, submergence ratio and porosity of obstacles, as well as particle diameter and particle density. Laboratory experiments were conducted on a closed-loop racetrack flume, using Lagrangian Particle Tracking (LPT) to track the transport of particles and Particle Image Velocimetry (PIV) to identify specific mean and turbulent conditions that determine particle retention or redirection. The study yields 4 main findings: (1) Coherent flow structures are developed at a threshold gap length and at a threshold submergence ratio, beyond which capture of particles within the gap increases. (2) Particles follow coherent eddies to enter the gap, while enhanced turbulence increases particles deviation from mean flow and deter particle entry. (3) Increased particle size and density retard the particle response to flow, creating high particle concentrations at low-velocity regions. (4) Porous obstacles create flow structures across various scales ranging from individual pore size to entire obstacle dimension, with increased pore sizes delaying the onset of recirculation, which affects the location of high particle concentration zones depending on the particle response time. Through a comprehensive understanding of flow-particle-obstacle interaction, we expect that our study will offer valuable insights for the efficient management of freshwater ecosystems by: 1) predicting particle accumulation zones, and 2) suggesting effective design of traps to capture specific organisms and particulate matter through assessment of the capture ratio and retention time of particles within gaps between submerged in-stream obstructions."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Analysis of the effects of coherent flow structures on the transport of particles around submerged obstacles in streams"]}]}],"canonical_facts":{"dc:contributor":["Tinoco, Rafael O.","Garcia, Marcelo H.","Chamorro, Leonardo P.","Escauriaza, Cristian","Pujara, Nimish"],"dc:creator":["You, Hojung"],"dc:date":["2024-07-10","2024-08"],"dc:description":["Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-08-01","The student, Hojung You, accepted the attached license on 2024-07-08 at 13:31.","The student, Hojung You, submitted this Dissertation for approval on 2024-07-08 at 13:41.","This Dissertation was approved for publication on 2024-07-10 at 16:06.","DSpace SAF Submission Ingestion Package generated from Vireo submission #20983 on 2025-02-04 at 21:16:29","Freshwaters transport various types of particulate matter, from plant seeds, fish eggs, and drifting invertebrates, to particles that can be harmful for aquatic biota, such as plastic debris, including macro-, meso-, and microplastics. Common obstacles in freshwater such as branches, logs and hydraulic structures are identified as local hotspots of various types of particles. Hydrodynamic analysis of these locations will provide a more efficient approach to capture and redirect particles in freshwater ecosystems by predicting particle trajectories under different flow conditions. In this research, we identify flow characteristics that create hotspots of particles, and study the interaction between flow and particles with various obstacle configurations and particle characteristics in a laboratory setting. The transport mechanisms of particles are analyzed as a function of spacing between neighboring obstacles, submergence ratio and porosity of obstacles, as well as particle diameter and particle density. Laboratory experiments were conducted on a closed-loop racetrack flume, using Lagrangian Particle Tracking (LPT) to track the transport of particles and Particle Image Velocimetry (PIV) to identify specific mean and turbulent conditions that determine particle retention or redirection. The study yields 4 main findings: (1) Coherent flow structures are developed at a threshold gap length and at a threshold submergence ratio, beyond which capture of particles within the gap increases. (2) Particles follow coherent eddies to enter the gap, while enhanced turbulence increases particles deviation from mean flow and deter particle entry. (3) Increased particle size and density retard the particle response to flow, creating high particle concentrations at low-velocity regions. (4) Porous obstacles create flow structures across various scales ranging from individual pore size to entire obstacle dimension, with increased pore sizes delaying the onset of recirculation, which affects the location of high particle concentration zones depending on the particle response time. Through a comprehensive understanding of flow-particle-obstacle interaction, we expect that our study will offer valuable insights for the efficient management of freshwater ecosystems by: 1) predicting particle accumulation zones, and 2) suggesting effective design of traps to capture specific organisms and particulate matter through assessment of the capture ratio and retention time of particles within gaps between submerged in-stream obstructions."],"dc:format":["application/pdf"],"dc:identifier":["https://hdl.handle.net/2142/125701"],"dc:language":["en","eng"],"dc:rights":["Copyright 2024 Hojung You"],"dc:subject":["Particle Transport","Turbulence","Piv","Coherent Structure"],"dc:title":["Analysis of the effects of coherent flow structures on the transport of particles around submerged obstacles in streams"],"dc:type":["text","Thesis"],"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":"2026-07-22T22:25:02Z"}