Rainfall is a
significant portion of hydrologic data. Rainfall records, however, are
often incomplete due to several factors. In this study, the inverse distance
weighting (IDW) method integrated
with GIS is used to estimate the rainfall distribution in Duhok Governorate. A total of 25 rain fall stations and
rainfall data between 2000 and 2010 were used, where 6 rainfall stations
were used for cross-validation. In addition, the relationship between interpolation accuracy and two critical parameters of IDW
(Power α value, and a radius of influence) was evaluated.
Also, the rainfall distribution of Duhok Governorate was classified. As an
output of this study and in most cases, the optimal parameters for IDW in interpolating rainfall data must
have a radius of influence up to (15 - 60 km).
However, the optimal α values varied between 1 and 5. Based on the results of
this study, we concluded that the IDW is an appropriate method of spatial interpolation to predict the probable rainfall data
in Duhok Governorate using α = 1 and search radius = 105 km for all the 25 rainfall stations.
Cite this paper
Noori, M. , Hassan, H. and Mustafa, Y. (2014) Spatial Estimation of Rainfall Distribution and Its Classification in Duhok Governorate Using GIS. Journal of Water Resource and Protection
, 75-82. doi: 10.4236/jwarp.2014.62012
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