Kermani, S. E.; Golmaee, H.; Ahmadi, M. Z.
January 2008
Journal of Environmental Hydrology;2008, Vol. 16, p1
Academic Journal
Simulation of cross section changes and sediment delivery in a specified time is the most important subject in river engineering. The spatial variation in sediment delivery along a channel reach is caused by sediment deposition and erosion. Studies of sediment delivery and channel changes may be through physical modeling or mathematical modeling, or both. Mathematical modeling of erodible channels has advanced with the progress in physics of fluvial processes and computer techniques. In this research, the delivery of sediment (sand and gravel) in the Neka River was studied through mathematical modeling of spatial variations of sediment characteristics for the effects of 200, 100, 50, and 25 year floods. The simulation results are useful for identifying river reaches subject to potential erosion and deposition. The results show sediment delivery increases toward the downstream direction. The amount of sediment delivery for the 200-year flood is 152000 tons and decreases for lower return periods. The general pattern of sediment delivery shows that there is erosion from the channel boundary. The study illustrates how erosion and fill of the channel bed accompanied by significant changes in channel width may contribute significantly to sediment storage. Sediment yield can be better quantified by an erodible-boundary model, as opposed to an erodible-bed model.


Related Articles

  • Erosion modelling towards, and sediment transport modelling in unnavigable watercourses in Flanders, Belgium. FERKET, B.; VAN DE BROEK, M.; VAN HOESTENBERGHE, T.; DEGERICKX, J.; DE SUTTER, R.; GOVERS, G.; DEZILLIE, N.; DEPROOST, P. // Proceedings of the International Association of Hydrological Sci;2015, Vol. 367, p349 

    Antea Group and KULeuven were awarded a project in Flanders to identify the regions exporting high sediment loads to unnavigable watercourses and the sedimentation zones within them. Two types of models are applied: hydrological sediment export models (SEM) and hydraulic sediment transport...

  • River incision into bedrock: Mechanics and relative efficacy of plucking, abrasion, and cavitation. Whipple, Kelin X.; Hancock, Gregory S. // Geological Society of America Bulletin;Mar2000, Vol. 112 Issue 3, p490 

    Presents qualitative field evidence on the relative efficacy of the various processes of fluvial erosion such as plucking, abrasion, cavitation and solution, into river bedrock. Inference from detailed observation of the morphology of erosional forms on channel beds and banks; Importance of the...

  • Sediment transport to the Arctic Ocean and adjoining cold oceans. Hasholt, Bent; Bobrovitskaya, Nelly; Bogen, Jim; McNamara, James; Mernild, Sebastian H.; Milburn, David; Walling, Desmond E. // Nordic Hydrology;2006, Vol. 37 Issue 4/5, p413 

    This paper reviews and synthesises available information on sediment transport to the Arctic Ocean and adjoining seas with open contact to the Atlantic and Pacific Oceans. Special emphasis is placed on calculation and estimation of the sediment flux from the mostly ungauged high Arctic areas on...

  • Numerical modelling of cohesive sediment transport in rivers. Willis, David H.; Krishnappan, B. G. // Canadian Journal of Civil Engineering;Oct2004, Vol. 31 Issue 5, p749 

    Techniques available to practicing civil engineers for numerically modelling cohesive mud in rivers and estuaries are reviewed. Coupled models, treating water and sediment as a single process, remain research tools but are usually not three-dimensional. The decoupled approach, which separates...

  • Suspended sediment transport along an idealised tidal embayment: settling lag, residual transport and the interpretation of tidal signals. Pritchard, David; Winterwerp, Han // Ocean Dynamics;Nov2005, Vol. 55 Issue 2, p124 

    We present semi-analytical solutions for suspended sediment concentration (SSC) and residual sediment transport in a simple mathematical model of a short tidal embayment. These solutions allow us to investigate in some detail the characteristic tidal and semi-tidal variation of SSC and the...

  • Modeling beach profile evolution at centennial to millennial scales. Leont'yev, I. // Oceanology (00014370);Jul2012, Vol. 52 Issue 4, p550 

    The proposed model allows the satisfactory reproduction of the changes in the profile geometry in each time step depending on the sediment budgets in a given morphodynamic system. The applied modification to the general Bruun rule governing the conservation of mass must account for the effect of...

  • Longshore Sediment Transport on the Northern Coast of the Yucatan Peninsula. Appendini, Christian M.; Salles, Paulo; Mendoza, E. Tonatiuh; López, José; Torres-Freyermuth, Alec // Journal of Coastal Research;Nov2012, Vol. 28 Issue 6, p1404 

    This paper presents a qualitative assessment of coastal processes along the northern coast of the Yucatan Peninsula based on a method used to estimate the potential longshore sediment transport. Despite the deep-water low-energy wave conditions (Hs = 1 m) in the study area, erosion is critical...

  • A combined model of sediment production, supply and transport. MASAHARU FUJITA; KAZUKI YAMANOI; HIROAKI IZUMIYAMA // Proceedings of the International Association of Hydrological Sci;2015, Vol. 367, p357 

    In previous sediment-runoff models, the sediment production rates of mountain slopes, and the sediment supply rates to streams typically have been developed using empirical methods. A process-based model for sediment production and supply is, however, required for more exact simulations of...

  • Modelling sand/mud transport and morphodynamics in the Seine river mouth (France): an attempt using a process-based approach. Waeles, B.; Hir, P.; Lesueur, P.; Delsinne, N. // Hydrobiologia;Jul2007, Vol. 588 Issue 1, p69 

    The mouth of the Seine River estuary (France) has undergone marked morphological evolution over several decades mainly due to engineering works aimed at improving access to Rouen and Le Havre harbours. The intertidal areas are decreasing in size and the lower estuary is accumulating sediment and...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics