A numerical study of the flow patterns around midchannel islands in lowland rivers and their possible biogeomorphological impacts

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dc.contributor.authorHeıdarı, Naghmeh
dc.contributor.authorHeidari, Naghmeh
dc.contributor.authorYagcı, Oral
dc.contributor.authorValyrakis, Manousos
dc.date.accessioned2026-01-24T12:01:11Z
dc.date.available2026-01-24T12:01:11Z
dc.date.issued2023
dc.departmentAlanya Alaaddin Keykubat Üniversitesi
dc.description.abstractMidchannel islands (MCIs) are instream geomorphic units generally emerge in lowland rivers. Despite their significant ecomorphological services in the river ecosystem, the flow patterns around these self-forming riparian landforms and their impacts on aquatic life are not fully understood yet. Understanding the flow pattern around these formations enables practitioners to produce cost-effective, sustainable, and eco-friendly river management projects and strategies, forming the motivation of this study. Herein, the secondary flow pattern around MCIs was analyzed by employing a RANS-based numerical model. Flow around the simplified bodies was simulated to give a more precise analysis regarding flow-island interactions. Once the numerical validation process was completed for the cylinder using an experimental dataset, the validated model was implemented for islands (streamlined island, vertically sloped island (VSI), and realistically sloped island (RSI)). Analysis of the model results revealed the following key findings: 1) the RSI acted like a streamlined object and produced weaker lee-wake vortices with a longer recovery distance compared to the streamlined island and the VSI, 2) the RSI gained a better-streamlined form near the bed than near the water surface due to enhanced elongation, 3) this situation in the RSI case generated highly variable flow patterns along the depth behind the MCI, and 4) due to the three-dimensional geometry of the RSI, the generated large-scale vortices propagated asymmetrically towards the sides of the channel rather than remaining around the centerline.
dc.identifier.doi10.30897/ijegeo.1320654
dc.identifier.endpage175
dc.identifier.issn2148-9173
dc.identifier.issue3
dc.identifier.startpage154
dc.identifier.trdizinid1269296
dc.identifier.urihttps://search.trdizin.gov.tr/tr/yayin/detay/1269296
dc.identifier.urihttps://doi.org/10.30897/ijegeo.1320654
dc.identifier.urihttps://hdl.handle.net/20.500.12868/4069
dc.identifier.volume10
dc.indekslendigikaynakTR-Dizin
dc.language.isoen
dc.relation.ispartofInternational Journal of Environment and Geoinformatics
dc.relation.publicationcategoryMakale - Ulusal Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_TR-Dizin_20260121
dc.subjectComputational fluid dynamics
dc.subjectmidchannel island
dc.subjectlowland rivers
dc.subjectwake hydrodynamics
dc.subjectsecondary flow
dc.titleA numerical study of the flow patterns around midchannel islands in lowland rivers and their possible biogeomorphological impacts
dc.typeArticle

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