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Journal of Applied Sciences
Year: 2009  |  Volume: 9  |  Issue: 6  |  Page No.: 1141 - 1146

Regional Analysis of Low Flow in Karkheh and Karoon Watersheds

H. Zarrin, F. Sharifi, M. Vafakhah and M.H. Mahdian    

Abstract: In this research, to evaluating of low flow from data of 28 hygrometry stations of Karkheh and Karoon basin, were analyzed and then flow duration curve was drew and discharge of parameters includes Q75%, Q90%, Q92%, Q95% and Q99% were calculated. Toward nomination of effective factors on low flow 21 parameters was detected such as physiographic, hydro climatic and geomorphologic, with geographic information system. With principal components analysis method we chose components which has less correlation. This component in regard of their importance include: weighted average slop of catchment, area, average elevation of catchment, compactness coefficient and slop of main channel which illustrate 80.5% of variation of data. In continue regional analysis with multivariate regression to establish relations between low flow and catchment’s characteristics. Finally regard to comparing and assessment the accuracy of estimating methods, we used 9 control stations data and then we compared the amount of discharge of low flow-on the base of-achieved models with the amounts of control stations and finally the results shown that obtained models in this area were significant (at 99% level).

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