Regionalization analysis and streamflow simulation in selected watersheds in Southern Luzon, Philippines using the soil and water assessment tool (SAT) model
2016
Briones, R.U.
In this study, 13 non-tested catchments distributed in Southern Luzon, Philippines was regionalized using SWAT model. Six regionalization were employed: Physical similarity (PS), spatial proximity (SP), global men parameter (GMP), climatic mean parameter (CMP), monsoon parallel parameter (MPP) and monsoon and easterlies parallel parameter (MEPP). The model predictive accuracy was measures by three statistical indicators. Nash-Sutcliffe efficiency (NSE), percent bias (PBIAS), and the ratio of the root mean square error to the standard deviation of observed data (RSR). All regionalization approach performed better than uncalibrated SWAT model, MEPP performed best with 92% of catchment improved in NS, 85% for RSR and 100% for PBIAS while physical similarity has the lowest performance with 62% for NS, 62% of RSR and 69% for PBIAS. All regionalization approaches are also better than PC in terms of the number of satisfactory catchment (NS0.50, RSR less than or equal 0.70, and PBIAS less than not equal to 25). Uncalibrated SWAT did not yield and satisfactory catchment while PS, SP, RMP, CMP, MPP and monsoon and easterlies parallel parameter (MEPP)have 1, 2, 2, 1, 4, and 5 respectively. Depending upon availability of donor catchment, authors recommend MEPPMPPRMP greater or equal to SPCMPPS approach for the southern Luzon region 4A and Region 4 B) particularly in VIPMC area. With increasing availability of input data with higher spatial and temporal resolution, methods used this study can be replicated and verified in other regions of the country.
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