Skip to Main Content

The model was calibrated over the five years from 2001 to 2005 for Nam Kim and Ngoi Hut. Some sensitive parameters were adjusted, as summarized in Table 1. Note that some final values were averaged from the values of hydrologic response units (HRUs). Model validation was applied after every calibration from 2006 to 2012. The goodness of agreement between the simulated data and the observed data were evaluated using the coefficient of determination (R2), the Nash–Sutcliffe simulation efficiency coefficient (NSE) and graphical methods. These methods were also applied for BEACH and KINEROS2.

Table 1

Top ten SWAT sensitive parameter and final values

Sensitivity orderParameterDescriptionUnitRangeInitial valueFinal value
CN2 Curve number condition 2 – 35–98 35 54.1 
Alpha_Bf Baseflow recession constant days 0–1 0.04 0.4 
Ch_K2 Effective hydraulic conductivity in channel mm hr−1 −0.01–500 50 75 
Sol_K Saturated hydraulic conductivity mm hr−1 0–2,000 4.30 
Ch_N2 Manning n value for the main channel – −0.01–0.3 0.015 0.05 
Surlag Surface runoff lag coefficient – 1–24 2.5 
Sol_Awc Available water capacity mm mm−1 0–1 0.22 0.31 
Gw_Revap Revap coefficient – 0.02–0.2 0.02 0.2 
Esco Soil evaporation compensation factor – 0-1 0.95 
10 Gwqmin Threshold water level in shallow aquifer for base flow mm 0–5,000 0.50 
Sensitivity orderParameterDescriptionUnitRangeInitial valueFinal value
CN2 Curve number condition 2 – 35–98 35 54.1 
Alpha_Bf Baseflow recession constant days 0–1 0.04 0.4 
Ch_K2 Effective hydraulic conductivity in channel mm hr−1 −0.01–500 50 75 
Sol_K Saturated hydraulic conductivity mm hr−1 0–2,000 4.30 
Ch_N2 Manning n value for the main channel – −0.01–0.3 0.015 0.05 
Surlag Surface runoff lag coefficient – 1–24 2.5 
Sol_Awc Available water capacity mm mm−1 0–1 0.22 0.31 
Gw_Revap Revap coefficient – 0.02–0.2 0.02 0.2 
Esco Soil evaporation compensation factor – 0-1 0.95 
10 Gwqmin Threshold water level in shallow aquifer for base flow mm 0–5,000 0.50 

Close Modal

or Create an Account

Close Modal
Close Modal