حل توزيع عرضي سرعت جريان در رودخانه ها: مطالعه موردي : ايستگاه هيدرومتري ملاثاني، رودخانه كارون)

Numerical solution of velocity lateral distribution in rivers (Case study: Karoun river at Molasani station)

The most applicable method for determination of flow discharge in rivers is measurement of lateral distribution of velocity in hydrometric stations. This task should be done regularly and many times in natural flow conditions and specially during floods. Costs, time and dangers of this task during high floods are very considerable. For optimizing this process, application of recent digital devices and also two dimensional and quasi-two dimensional mathematical models are unavoidable. In this paper, a quasi-two dimensional numerical model suitable for flood hydraulic theory of floodplains is presented to make possible the prediction of velocity lateral distribution in both inbank and overbank flow conditions. This numerical model has been tested in Karoun rivet at Molasani hydrometric station. The model resultʹs analysis show that the mean error in prediction of inbank and flood discharges in this station is nearly 9 percent.