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The efficiency of the MIKE SHE model is also shown through the statistical coefficients in Table 4. Observed and simulated daily and monthly discharges are compared. These numbers demonstrate the accuracy of the model and its efficiency for describing the hydrological processes of the Vu Gia Thu Bon catchment. The R and E coefficients at Nong Son and Thanh My for the calibration period are 0.92, 0.89 and 0.82, 0.78, respectively. In the validation period, these factors slightly decrease. R and E coefficients at Nong Son station are 0.92 and 0.82 and at Thanh My, 0.90 and 0.69. The RMSE coefficients at Nong Son and Thanh My in both periods are relatively small. Over the 10 year period, the RMSE of simulation is only 132.3 m3/s at Thanh My versus maximum observation 4,440 m3/s–minimum observation 12.2 m3/s. The value at Nong Son is 288.7 m3/s versus maximum observation 8,920 m3/s–minimum observation 21.7 m3/s. The RMSE of validation at Thanh My is 123.2 m3/s versus maximum observation 4,540 m3/s–minimum observation 20.2 m3/s and at Nong Son is 250.5 m3/s versus maximum observation 8,410 m3/s–minimum observation 21.9 m3/s. Due to these big differences between maximum and minimum values of observed data, the values of the normalized root mean square error at these stations are quite small, with a value below 0.05. For the monthly analysis, the good performance of the model is obviously demonstrated by the figures in Table 4.

Table 4

Statistical indices of the MIKE SHE model in the Vu Gia Thu Bon catchment

  Calibration (1991–2000)
Validation (2001–2010)
Daily
Monthly
Daily
Monthly
StationRMSERERMSERERMSERERMSERE
Water level (m) Thanh My 0.77 0.86 0.67 0.52 0.97 0.77 0.68 0.83 0.61 0.32 0.94 0.86 
Ai Nghia 0.70 0.81 0.63 0.41 0.96 0.81 0.66 0.78 0.56 0.35 0.94 0.83 
Cam le 0.26 0.83 0.12 0.18 0.94 0.32 0.28 0.8 −0.46 0.2 0.94 −0.13 
HiepDuc 0.77 0.89 0.77 0.44 0.97 0.88 0.91 0.83 0.59 0.63 0.92 0.67 
Nong Son 0.89 0.88 0.76 0.49 0.97 0,89 0.84 0.86 0.72 0.42 0.96 0.89 
Giao Thuy 0.85 0.85 0.61 0.6 0.97 0.73 0.73 0.82 0.6 0.4 0.95 0.82 
Cau Lau 0.44 0.84 0.56 0.16 0.96 0.9 0.47 0.83 0.16 0.2 0.97 0.25 
Discharge (m3/s) Thanh My 132.3 0.89 0.78 58.06 0.96 0.89 123.2 0.9 0.69 47.03 0.96 0.87 
Nong Son 288.7 0.92 0.82 160.4 0.97 0.86 250.5 0.91 0.82 131.04 0.97 0.87 
  Calibration (1991–2000)
Validation (2001–2010)
Daily
Monthly
Daily
Monthly
StationRMSERERMSERERMSERERMSERE
Water level (m) Thanh My 0.77 0.86 0.67 0.52 0.97 0.77 0.68 0.83 0.61 0.32 0.94 0.86 
Ai Nghia 0.70 0.81 0.63 0.41 0.96 0.81 0.66 0.78 0.56 0.35 0.94 0.83 
Cam le 0.26 0.83 0.12 0.18 0.94 0.32 0.28 0.8 −0.46 0.2 0.94 −0.13 
HiepDuc 0.77 0.89 0.77 0.44 0.97 0.88 0.91 0.83 0.59 0.63 0.92 0.67 
Nong Son 0.89 0.88 0.76 0.49 0.97 0,89 0.84 0.86 0.72 0.42 0.96 0.89 
Giao Thuy 0.85 0.85 0.61 0.6 0.97 0.73 0.73 0.82 0.6 0.4 0.95 0.82 
Cau Lau 0.44 0.84 0.56 0.16 0.96 0.9 0.47 0.83 0.16 0.2 0.97 0.25 
Discharge (m3/s) Thanh My 132.3 0.89 0.78 58.06 0.96 0.89 123.2 0.9 0.69 47.03 0.96 0.87 
Nong Son 288.7 0.92 0.82 160.4 0.97 0.86 250.5 0.91 0.82 131.04 0.97 0.87 

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