توزيع تناوب سيل مشتق شده بر اساس آبنمود واحد لحظه اي ژيومورفوكليماتيك و تابع چگالي بارش مازاد حوزه (مطالعه موردي حوزه مند رجان )

Flood Frequency Distribution Derived on the Based on Geomorphoclimatic Instantaneous Unit Hydrograph and Probability Density Function of Rainfall Excess Intensity and Duration (Case study: Menderjan Catchment)

Derived flood frequency distribution method with geomorphoclimatic instantaneous unit hydrograph, the joint probability density function (pdf) of storm intensity & duration, Philipʹs equation of the infiltration process were employed to derive a flood frequency distribution in Menderjan catchment (one of the subbasins of Zayanderud watershed). This method provides an alternative to estimate flood frequency distribution in ungauged catchments. This frequency distribution was compared with frequency distribution resulted from statistical method (LP3 distribution). The results in this study indicated that using climatic climax soil parameters was in a better agreement with the observations than the ordinary conditions of soil parameters. This method was of poor performance in estimating high return period floods.