Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2009.1098.1105Fallah-GhalharyG.A.Mousavi-BaygiM.Habibi-NokhandanM.6200996The rainfall of Khorasan Province, the Northeastern
part of Iran, was evaluated from Dec. to May that is included 80% total
of annual rainfall in the area under study using artificial neural network.
The data of 37 rainfall stations were selected and analyzed over a period
of 33 years (1970-2002). The Digital Elevation Model (DEM) was then used
to calculate the average rainfall in the area of interest. The relation
between variation of synoptic patterns including Sea Surface Temperature
(SST), Sea Level Pressure (SLP), the difference of sea level pressure,
the difference between sea surface temperature and 1000 hPa surface level,
relative humidity at 300 hPa level, geopotential height at 500 hPa level
and air temperature at 850 hPa level with mean rainfall of the region
were considered. Then the artificial neural network model was trained
for 1970-2002 period and rainfall for period of 1993-2002 was predicted.
The results showed that artificial neural network method was very successful
in predicting rainfall and in more than 70% of years could predict rainfall
within acceptable precision. The root mean square error of the model was
found to be 41 mm which is considered negligible at yearly level and it
is expected that by increasing the number of years of statistical data
the precision of the model would increase.]]>Mohammadi, K. and F. Misaghi,2003Mahdizadeh, M.B.,2004Cavazos, T.,2000Fogel, D.B.,1999Wong, K.W., P.M. Wong, T.D. Gedeon and C.C. Fung,2003Karamouz, M., B. Zahraie and S. Eghdamirad,2004Khoshakhlagh, F.,1998Lee, S., S. Cho and P. Wong,1998Liu, J. and R. Lee,1999McCullagh, J., K. Bluff and E. Ebert,1995Matayo, I., H.M. Fredrick, L. Semazzi and J. Ogallo,2000Christodoulou, C. and M. Georgiopoulos,2000Nazemosadat, M.J. and I. Cordery,2000Pozo-Vazquez, D., M.J. Esteban-Parra, F.S. Rodrigo and Y. Castro-Diez,2001Saji, N.H., B.N. Goswami, P.N. Vinayachandran and T. Yamagata,1999Surajit, C. and C. Manojit,2007Suwardi, A., K. Takenori and K. Shuhei,2006Ramirez, M.C.V., H.F.D.C. Velho and N.J. Ferreira,2005