Comparative Study of the Best Methods for Estimating Maximum Annual Precipitation in Selected Stations of Haraz River

Gholami, Abbas

doi:10.22067/geoeh.2021.71958.1096

Comparative Study of the Best Methods for Estimating Maximum Annual Precipitation in Selected Stations of Haraz River

Document Type : Research Article

Author

Abbas Gholami

Assistant Professor, Faculty of Engineering ,Shomal University,Amol, Mazandaran, Iran

10.22067/geoeh.2021.71958.1096

Abstract

The purpose of this study was to compare the statistical parameters of maximum annual precipitation in the watershed of Haraz River located in the central part of the Alborz Mountains. After reviewing the data of precipitation in Haraz watershed and considering lack of long-term statistics in the study area, Panjab-Haraz, Karsang-Haraz and Mahmoudabad-Haraz stations in different parts of the river from mountain to plain in 44-year statistical period from the water year of 1968-69 to 2011-2012 were selected. The annual precipitation frequency analysis of the selected stations was performed and the results of the Residual sum of squares (RSS) test were extracted by the method of ordinary moments and the maximum likelihood at this stage to be compared with the linear moments method. Residual sum of the squares in the linear moment method were also calculated by a computer program for the studied distributions. The results showed that in general, normal moment and maximum likelihood methods in selected stations have better fit and less RSS. The results of scoring and ranking the best selected method and distribution also showed that in all three selected stations, the maximum likelihood method with the minimum RSS was the best fit with the annual maximum precipitation data.

Graphical Abstract

Keywords

Maximum Annual Precipitation

Maximum Likelihood

Linear Moment

Haraz River

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