Jurnal TANAH TROPIKA (Journal of Tropical Soils), Vol 22, No 2

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Parameter Sensitivity Test of SWAT Hydrological Model On Two Different Resolutions (Case Study: Sub-Das Cisadane Hulu, West Java)

Nurmaranti Alim, Suria Darma Tarigan, DPT Baskoro, Enni Dwi Wahjunie


A sensitivity analysis of SWAT parameters conducted on different input resolutions. The analysis will determine the input parameters that have the most influence on the role of output.Resolution of different inputs in the SWAT analysis, parameters can produce different inputs so as to cause the effect on output. The purpose of this study was to identify the level of sensitivity of the parameters in the model SWAT on two different resolutions, i.e. 1: 100 000 and 1: 250 000. A sensitivity test wasconducted manually by using the method that is absolute sensitivity to change (either increase or decrease) in each data base SWAT model parameters one by one while the other parameters fixed. NSE value of calibration for both of scale resolution demonstrates the similar NSE value, with the category on a daily simulation quite satisfactory (values   NSE 0.55 and 0.54), while the monthly simulation as very satisfactory (NSE value of 0.80 and 0.82). The level of sensitivity parameters is divided into three groups: sensitive, less sensitive and insensitive. Simulation daily and monthly for both of scale shows the parameter-sensitive parameters are the same that Alpha_BNK (baseflow alpha factor for bank storage) , CN2 (moisture condition II curve number), CH_K2 (effective hydraulic conductivity in main channel alluvium), CH_N2 (manning’s “n” value for the main channel), ESCO (soil evaporation compensation factor), GW_Delay (groundwater delay), and GW_Revap (groundwater “revap” coefficient).

Keywords: Absolute method sensitivity, group parameter sensitivity, simulation daily and monthly


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