JWARP  Vol.6 No.2 , February 2014
Average Rainfall Estimation: Methods Performance Comparison in the Brazilian Semi-Arid
ABSTRACT

Considering the rainfall’s importance in hydrological modeling, the objective of this study was the performance comparison, in convergence terms, of techniques often used to estimate the average rainfall over an area: Thiessen Polygon (TP) Method; Reciprocal Distance Squared (RDS) Method; Kriging Method (KM) and Multiquadric Equations (ME) Method. The comparison was done indirectly, using GORE and BALANCE index to assess the convergence results from each method by increasing the rain gauges density in a region, through six scenarios. The Coremas/Mae Dágua Watershed employed as study area, with an area of 8385 km2, is situated on Brazilian semi-arid. The results showed the TP, as RDS and ME techniques to be employed successfully to obtain the average rainfall over an area, highlighting the MEM. On the other hand, KM, using two variograms models, had an unstable behavior, pointing the prior study of data and variogram’s choice as a need to practical applying.


Cite this paper
Barbalho, F. , Silva, G. and Formiga, K. (2014) Average Rainfall Estimation: Methods Performance Comparison in the Brazilian Semi-Arid. Journal of Water Resource and Protection, 6, 97-103. doi: 10.4236/jwarp.2014.62014.
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