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The velocity determination was affected by different hydraulic conditions. According to Table 3, the catchment size, discharge, water depth and width are correlated with each other, while the aspect ratio is independent from other parameters. Besides, the previous results showed higher determination quality in the flood season and in the middle part of the cross section. Therefore, we mainly focus on the effects of water depth and aspect ratio on the determination quality of the modified Manning formula.

Table 3

The correlation among river hydraulic parameters

 Catchment size (km2/s)Discharge (m3/s)Width (m)Depth (m)Aspect ratio (w/D)
Catchment size (km2/s)     
Discharge (m3/s) 0.986931    
Width (m) 0.851444 0.850256   
Depth (m) 0.90108 0.918353 0.771241  
Aspect ratio (w/D) –0.26513 –0.29486 0.172885 –0.48114 
 Catchment size (km2/s)Discharge (m3/s)Width (m)Depth (m)Aspect ratio (w/D)
Catchment size (km2/s)     
Discharge (m3/s) 0.986931    
Width (m) 0.851444 0.850256   
Depth (m) 0.90108 0.918353 0.771241  
Aspect ratio (w/D) –0.26513 –0.29486 0.172885 –0.48114 

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