Morphodynamic Simulation of River Bend Retreat (erosion)

Modeling the failure and erosion of riverbank in bends by considering a 3D flow and simulation of riverbank retreat due to erosion and failure mechanism. Monitoring the necessary parameters in field and also doing experimental test in laboratory. Measurement of shear stress at bank and exploration of turbulent structure responsible for erosion of sediment at riverbank-toe are other aims of this research.In year 2005:A review on erosion and failure mechanism together with mathematical models of flow and fluvial processes has been achieved and prepared in 70 pages. A new formula for computation of critical shear stress at side slope of the river was developed by consideration of hydrodynamic pressure forces.Hardebek-Brokenlander Au was selected for the monitoring purposes. Required instruments have been studied and will be ordered in the coming year. Detail drawings for experimental set up in the mentioned river have been drawn. The first laser scanning from eroded part of riverbank has been achieved.Having received RMA suit models (RMA10, RMA11, RMAAGEN) from Prof. King, the first steps in implementations of new morphodynamic model were taken, that is getting through the code.Sediment transport and erosion model for the bank-toe of the riverbank in a meandering channel has been developed. It is being implemented inRMA10s model. The necessary instruments has been purchased and are going to be installed in the river. River survey, TIN model, soil mechanical test, erosion test has been achieved. The instrument support structure has been built and prepared.

• 3-11.034V
  Nasermoaddeli,MH., Pasche E., " A multiparameter automatic convergence algorithm for flow simulation", 7^th International Conference on Hydroinformatics HIC 2006, Nice, FRANCE,Sept. 4-8,2006.
• 3-11.035V
  Pasche E., Kraessig S., Lippert K.,Nasermoaddeli MH., Ploeger W. and Rath S., “Wieviel Physik braucht die Strömungsberechnung in der Ingenieurpraxis?”, Wasserbaukolloquium, Strömungssimulation im Wasserbau, Dresdner Wasserbauliche Mitteilungen/,Dresdner, Germany,2006, Heft 32, 237-260.

Stichwörter

• Banktoe
• River bank
• Three dimensional model
• erosion
• fluvial
• hydrodynamic
• meander
• monitoring
• morphodynamic
• non-equilibrium
• retreat
• sediment transport