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Three dimensional numerical modelling of flow and sediment transport in rivers
KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Mark- och vattenteknik, Vattendragsteknik.
KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Mark- och vattenteknik, Vattendragsteknik.ORCID-id: 0000-0002-2342-2068
2007 (engelsk)Inngår i: International Journal of Sediment Research, ISSN 1001-6279, Vol. 22, nr 3, s. 188-198Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The 3D numerical model, ECOMSED (open source code), was used to simulate flow and sediment transport in rivers. The model has a long history of successful applications to oceanic, coastal and estuarine waters. Improvements in the advection scheme, treatment of river roughness parameterization and shear stress partitioning were necessary to reproduce realistic and comparable results in a river application. 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 observed secondary currents, bed shear stress distribution and erosion-deposition patterns on a curved channel. The model also successfully predicted the general flow patterns and sediment transport characteristics of a 1-km long reach of the River Klaralven, located in the north of the county of Varmland, Sweden.

sted, utgiver, år, opplag, sider
2007. Vol. 22, nr 3, s. 188-198
Emneord [en]
roughness parameterization; numerical models; river flow; sediment transport
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-8247ISI: 000257209800003Scopus ID: 2-s2.0-35348934992OAI: oai:DiVA.org:kth-8247DiVA, id: diva2:13518
Merknad
QC 20100827 Tilgjengelig fra: 2008-04-22 Laget: 2008-04-22 Sist oppdatert: 2020-01-02bibliografisk kontrollert
Inngår i avhandling
1. Modeling flow and sediment transport in water bodies and watersheds
Åpne denne publikasjonen i ny fane eller vindu >>Modeling flow and sediment transport in water bodies and watersheds
2008 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
Stockholm: KTH, 2008. s. viii, 21
Serie
Trita-LWR. PHD, ISSN 1650-8602 ; 1039
Emneord
Bed load transport model, ECOMSED, Hydrology, Hydrodynamics, Spectral Analysis, SWAT
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-4703 (URN)978-91-7178-925-9 (ISBN)
Disputas
2008-05-08, F3, Lindstedtvägen 26, Kungliga Tekniska högskolan | Adress SE-100 44 Stockholm | Telefon +46 8 790 60 00, KTH, 10:00
Opponent
Veileder
Merknad
QC 20100827Tilgjengelig fra: 2008-04-22 Laget: 2008-04-22 Sist oppdatert: 2010-08-27bibliografisk kontrollert
2. 3-D numerical modeling of flow and sediment transport in rivers
Åpne denne publikasjonen i ny fane eller vindu >>3-D numerical modeling of flow and sediment transport in rivers
2005 (engelsk)Licentiatavhandling, med artikler (Annet vitenskapelig)
Abstract [en]

The fully integrated 3-D, time dependant, hydrodynamic and sediment transport numerical model ECOMSED was used to simulate flow and sediment transport in rivers. ECOMSED was originally developed for large water bodies such as lakes and oceans and solves the primitive equations of RANS along with a second order turbulence model in an orthogonal curvilinear σ- coordinate system. The availability of the model as an open FORTRAN source code made modifications and addition of new models possible. A new bed load transport model was implemented in the code as well as improvements in treatment of river roughness parameterization, bed form effects, and automatic update of flow depth due to bed evolution. The model was applied to 1- km long reach of the River Klarälven, Sweden, where it bifurcates into two west and east channels. The water surface and the flow division in the channels were made in agreement with field data by spatially varying the roughness. However, the spatial distribution of the bed shear stress was not realistic. Improvements were made in the bottom boundary condition to represent the variable effects of bed forms on roughness depending on the flow regime and the flow depth. The improved model realistically reproduced the flow field as well as the sediment transport processes in the river Klarälven.

sted, utgiver, år, opplag, sider
Stockholm: KTH, 2005. s. vi, 25
Serie
Trita-LWR. LIC, ISSN 1650-8629 ; 2028
Emneord
Environmental technology, River model; ECOMSED model; River Klarälven; Bed load transport model, Miljöteknik
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-323 (URN)
Presentation
2005-06-08, E3, Osquars backe 14, Stockholm, 10:00
Merknad
QC 20101123Tilgjengelig fra: 2005-07-25 Laget: 2005-07-25 Sist oppdatert: 2010-11-23bibliografisk kontrollert

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