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Journal of Environmental Hydrology
ISSN 1058-3912 |
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Electronic Journal of the International Association for
Environmental Hydrology
JEH Volume 16 (2008), Paper 40 Posted December 16, 2008 MATHEMATICAL MODELING OF FLUVIAL SEDIMENT DELIVERY, NEKA RIVER, IRAN
S.E. Kermani ABSTRACT 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. Reference: Kermani, S.E., H. Golmaee, and M.Z. Ahmadi. 2008. Mathematical modeling of fluvial sediment delivery, Neka River, Iran. Journal of Environmental Hydrology, Vol. 16, Paper 40. CONTACT: M.Z.Ahmadi College of Agricultural Engineering University of Mazandaran Sari, Iran E-mail: mzahmadi@yahoo.com |
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