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The water balance component is an important indicator to test the validity of precipitation data (Li et al. 2012), and the water balance components of the Naqu River Basin derived from the gauge precipitation-based model and corrected TRMM precipitation-based model are illustrated in Table 9. The results show that the average annual precipitation over all of the Naqu river basin obtained from corrected TRMM precipitation is slightly larger than that from gauge precipitation during 1998–2013. As a result, the areal runoff derived from the TRMM precipitation based model is larger than that derived from the gauge precipitation-based model, especially for surface runoff. However, the total areal precipitation of gauge precipitation is approximated to corrected TRMM precipitation, and the two models were calibrated by the same observed streamflow. Although the different empirical parameters also have an influence on the simulated streamflow, the difference in empirical parameters is originally derived from the difference in precipitation data. Consequently, it can be inferred that the difference in water balance components in the two models is essentially due to the difference between the spatial distribution of gauge precipitation and corrected TRMM precipitation at spatial scale.

Table 9

Comparison of the water balance components using gauge precipitation and corrected TRMM precipitation

 Gauge precipitation based model
Corrected TRMM precipitation based model
ComponentsValue (mm)Percentage of precipitation (%)Percentage of total runoff (%)Value (mm)Percentage of precipitation (%)Percentage of total runoff (%)
Precipitation 566.15   572.28   
Evapotranspiration 218.74 38.6  205.22 35.9  
Runoff 347.42 61.4  367.06 64.1  
Surface runoff 308.68  88.8 327.57  89.2 
Groundwater runoff 38.74  11.2 39.49  10.8 
 Gauge precipitation based model
Corrected TRMM precipitation based model
ComponentsValue (mm)Percentage of precipitation (%)Percentage of total runoff (%)Value (mm)Percentage of precipitation (%)Percentage of total runoff (%)
Precipitation 566.15   572.28   
Evapotranspiration 218.74 38.6  205.22 35.9  
Runoff 347.42 61.4  367.06 64.1  
Surface runoff 308.68  88.8 327.57  89.2 
Groundwater runoff 38.74  11.2 39.49  10.8 

Note: Evapotranspiration includes soil evapotranspiration, vegetation evapotranspiration, and canopy interception.

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