Water Quality and Sediment Behaviour of the Future: Predictions for the 21st Century (Proceedings of Symposium HS2005 at IUGG2007, Perugia, July 2007). IAHS Publ. 314, 2007., 306-311

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Sediment yield in the Daryacheh-Namak drainage basin, Iran, and its relation to land-use changes

SADAT FEIZNIA¹, ABDOLHOSSEIN MOHAMMADI² & SEPIDEH ZAKIKHANI³

1 Faculty of Natural Resources, University of Tehran, Karaj, Iran

sfeiz@ut.ac.ir

2 Jehad –Agriculture Research Center of Markazy Province, Iran

3 Faculty of Civil Engineering, Sharif University of Technology, Tehran, Iran

Abstract Monthly and annual variations in sediment yield during a 24-year period were analysed for 10 sub-catchments in the Daryacheh-Namak drainage basin, Iran. Highest specific suspended sediment yields were recorded at Razin and the lowest at Solan, reflecting large land-use changes in the former, and the presence of relatively resistant formations in the latter sub-catchment. Highest sediment yields were observed in the months of April, March, May and November, and the lowest in September and August. At almost all stations, the highest sediment yield occurs in the spring, reflecting higher rainfall in that season.

Key words Daryacheh-Namak drainage basin; monthly and annual variation; sediment yield

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