Paper Information

Journal:   PAJOUHESH-VA-SAZANDEGI   SUMMER 2007 , Volume 20 , Number 2 (75 IN NATURAL RESOURCES); Page(s) 86 To 91.
 
Paper: 

REGIONAL RAINFALL DISTRIBUTIONS OF IRAN

 
 
Author(s):  MODARES R.*
 
* FACULTY OF NATURAL RESOURCES, ISFAHAN UNIVERSITY OF TECHNOLOGY
 
Abstract: 

Rainfall frequency analysis is a major task for water resources planners and hydrologists. Because of wide and different rainfall temporal and spatial distribution over Iran, at site frequency analysis is not sufficient for this purpose. It is very important to regionalize rainfall frequency over homogeneous rainfall spatial groups. A hierarchical cluster analysis and L-moments regional frequency analysis were used in this study to find homogeneous rainfall groups and regional rainfall frequency analysis. The study showed that there are eight homogeneous rainfall subregions over Iran, which can present geographic and climate variability of Iran, but no single parent distribution was found for each subregion. Although regional homogeneity measure, H1, showed that a 3-parameter log normal distribution performs regional distribution of Iran, but three LN2, P-III and GEV distributions perform better than other distributions for subregions derived from cluster analysis.

 
Keyword(s): RAINFALL FREQUENCY ANALYSIS, CLUSTER ANALYSIS, WARD METHOD, L-MOMENT, IRAN
 
References: 
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