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jwmseir 2008, 2(4): 66-73 Back to browse issues page
Analysis of Short Duration Rainfalls of Khorasan
Bijan Ghahreman
Ferdowsi University of Mashhad
Abstract:   (6457 Views)

Rainfall is one of the meteorological parameters which plays an important role in developmental projects.

Three, twenty seven, and three recording rain-gauge stations were selected for North, Razavi, and

South Khorasan provinces, respectively. These stations had more than 8 years of record length, end to

2002. All of the recorded storms were digitized. Minimum and maximum storms were 182 and 525 for

Sangan-Khaf and Mashhad stations, respectively. However, all storms were not recorded completely. Yet

no acceptable method could be utilized for re-construction of such storms. Gumble distribution, among the

common distributions, better fitted the rainfall intensities of all stations. Considering 10 year-hourly rainfall


between rainfalls over the vast geographical territory of 3 provinces under study. Nonetheless, no significant

relationship could be derived for (p

map for (p

desired ungaged-point. It was shown that the bias for estimation of rainfall corresponding to any time duration

and frequency for all stations, except one, was negligible.

60.10) as a key point of rainfall intensity-duration-frequency (IDF), constant ratios were derived60.10) from other easily-computed parameters. Therefore, isohyetal60.10) was plotted. From this map, one can interpolate for a corresponding value for any
Keywords: Storm, IDF, Un-gauged Stations, Khorasan
Full-Text [PDF 324 kb]   (1192 Downloads)    
Type of Study: Research | Subject: Special
Received: 2013/01/27
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ghahreman B. Analysis of Short Duration Rainfalls of Khorasan. jwmseir. 2008; 2 (4) :66-73
URL: http://jwmsei.ir/article-1-85-en.html

Volume 2, Issue 4 (10-2008) Back to browse issues page
مجله علوم ومهندسی آبخیزداری ایران Iranian Journal of Watershed Management Science and Engineering
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