Special Interpolation of Precipitation Data in the Northern West Bank

Special Interpolation of Precipitation Data in the Northern West Bank

Ali Nimer Sabbobeh The distribution of precipitation in the Northern West Bank is so complicated. There is a great variation in precipitation over the Northern West Bank which is considered a small area. The raw precipitation data were not complete. In this research, precipitation data was taken from 28 stations located in the Northern West Bank for 28 years during the period of 1953 to 1980. Spatial analysis and modeling through computer models were developed to estimate precipitation at unknown points in the space. The models included: -Local models such as: Thiessen, Arithmetic Mean, Inverse Distance, and Exponential models. -Global models such as: Bilinear, Cubic, and Bicubic models. Constrained Optimal and Kriging models. A comparative analysis was done between these models to select the most appropriate model for our locality. The comparative analysis was based on fictious point method. The parameters included in the comparison were: sum of squared deviations, root mean deviation, mean of absolute value of biases for both mean precipitation and standard deviation of precipitation. The result of this comparison showed that the Bicubic Model is the best model that estimates the precipitation in the Northern West Bank. At the end of this study, recommendations are summarized by rehabilitation of existing weather stations, and establishment of new weather stations at several suggested locations to improve estimates of areal precipitation. Ali Nimer Sabbobeh Supervisors Dr. No' Man Mizyed Dr. Fayez Shaheen 1999 Zajel / An-Najah National University