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3D flow and sediment transport modeling in curved channels
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering, Hydraulic Engineering.
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering, Hydraulic Engineering.
2007 (English)In: 3rd IASTED International Conference on Environmental Modelling and Simulation, EMS 2007: Honolulu, HI: 20 August 2007 through 22 August 2007, 2007, 82-87 p.Conference paper, Published paper (Refereed)
Abstract [en]

A 3D hydrodynamic model coupled with a 2D bed load transport model is used to predict flow and sediment transport in a curved channel. The 3D hydrodynamic model is part of ECOMSED (open source code). ECOMSED has a long history of successful applications to oceanic, coastal, and estuarine waters. However, curved channel applications of the code are scarce. Improvements in the advection scheme of momentum and turbulence, and shear stress partitioning were necessary to reproduce realistic and comparable results in a curved channel. To account for the dynamics of the mobile bed boundary, a model for the bed load transport was included in the code. The model reproduced measured secondary currents, bed shear stress distribution, and erosion-deposition patterns on a curved channel.

Place, publisher, year, edition, pages
2007. 82-87 p.
Keyword [en]
2D bed load transport model; 3D hydrodynamic model; Curved channel; ECOMSED; Modeling
National Category
Water Engineering
Identifiers
URN: urn:nbn:se:kth:diva-8246Scopus ID: 2-s2.0-38349106483ISBN: 978-0-88986-682-9 (print)OAI: oai:DiVA.org:kth-8246DiVA: diva2:13517
Note
QC 20100827Available from: 2008-04-22 Created: 2008-04-22 Last updated: 2010-08-27Bibliographically approved
In thesis
1. Modeling flow and sediment transport in water bodies and watersheds
Open this publication in new window or tab >>Modeling flow and sediment transport in water bodies and watersheds
2008 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The research focus is on the various modeling aspects of flow and sediment transport in water bodies and watersheds. The interaction of flow with a mobile bed involves a complex process in which various turbulent scales characterized by coherent structures cause a chaotic sediment motion. In many rivers and natural waterways secondary flows that are dominating flow struc-tures bring about more complications. In estuaries and open waterbodies thermal stratification and internal mixing control the flow structure besides the flow interaction with the mobile bed. To adequately model these processes 3D coupled flow and transport models are needed. The research is based on use and adaptation of open source codes for 3D hydrodynamic and sediment transport model known as Estuarine Coastal Ocean Model (ECOMSED) and the Soil and Water Assessment Tool (SWAT) model. A bed load transport model was developed and coupled to ECOMSED. The flow and sediment transport characteristics in a curved channel and a river reach were successfully captured by the model. Improvements in ECOMSED were made to study the effect of wind and basin bathymetry on mixing and flow exchange between two estuaries. Using spectral analysis the hydrological component of SWAT model was investigated for its applicability under limited data conditions in three Ethiopian catchments.

Place, publisher, year, edition, pages
Stockholm: KTH, 2008. viii, 21 p.
Series
Trita-LWR. PHD, ISSN 1650-8602 ; 1039
Keyword
Bed load transport model, ECOMSED, Hydrology, Hydrodynamics, Spectral Analysis, SWAT
National Category
Water Engineering
Identifiers
urn:nbn:se:kth:diva-4703 (URN)978-91-7178-925-9 (ISBN)
Public defence
2008-05-08, F3, Lindstedtvägen 26, Kungliga Tekniska högskolan | Adress SE-100 44 Stockholm | Telefon +46 8 790 60 00, KTH, 10:00
Opponent
Supervisors
Note
QC 20100827Available from: 2008-04-22 Created: 2008-04-22 Last updated: 2010-08-27Bibliographically approved

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