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J Agric. Sci. Natur. Resour. ; Vol. 14(4), Oct -Nov 2007 wwwjasnr.info

www.sid.ir www.magiran.comljasnr

Determination oftbebest model to estimate suspended sediment loads in Gbazaghly gauge station-Gorganrood River, Iran

*A. Mohammadi1, A. Mosaede and A. Heshmatpour3

ilnstructor Dept. of Natural Sciences, Gonbad High Education Center, Gorgan University of Agricultural Sciences and Natural Resources, Iran, 2Associate Prof. Dep~. of Water Eng. Gorgan University. of Agricultural Sciences and Natural Resources, Iran, 3Ph.D. student and Instructor Dept. of Natural Sciences, Gonbad High

Education Center, Gorgan University of Agricultural Sciences and Natural Resources, Iran

Abstract Deficiency of country-wide and accurate information on erosion in Iran considered being an

obstacle in water projects. Lack of long time measurements of erosion, as well as insufficient researches in this field, limit the access to trustable data. In this condition, the amounts of eroded materials reached to the outlet of watersheds can represent the conditions of soil erosion in upstream areas. Method of measurement of daily suspended loads which is based on measuring suspended sediment concentration and flow discharge is a robust method but needs continuous daily measurements and therefore this is feasible only for major rivers. In this research, to determine the most appropriate method for estimating the suspended sediments in Ghazaghly gauge station which is located on Gorganrood river, 3595 data of flow discharge and corresponding sediment discharge, recorded during years of 1971-2003, were analyzed. By establishing correlation between flow and sediment discharge on the basis of five models: linear, multi linear, median of groups, seasonal, and monthly, the best model for prediction was selected. To achieve this, the mean of square error and also the regression coefficient, as statistical indices, were used. The results indicate that the median of group's model has the best performance amongst the models. Additionally, to compare the estimated sediments with observed data during one month observation period, the statistical index, relative mean of error, was applied. The results show that the median of group's model in comparison with the other tested models gives the minimum relative mean of error and therefore has the best ability to predict sediment transport. It is suggested, that represent the flow conditions more precisely, the data collection in the case of flood events is conducted within smaller time intervals. The poor performance of the linear model compared with the other stated models in estimating the sediment load, indicates that using of this model should be performed with caution in Ghazaghli river.

Keywords: Suspended sediment load; Relative mean of error; Mean of square error; Gorganrood River; Ghazaghli gauge station

E-mail:amobaran@yahoo.com

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