The Variation of Riverbed Material due to Tropical Storms in Shi-Wen River, Taiwan

Table 3

Manning’s roughness coefficient computed from empirical formulas.

Site	Before typhoon season				After typhoon season
	𝑛1	𝑛2	𝑛3	𝑛4	𝑛1	𝑛2	𝑛3	𝑛4
1	0.077	0.023	0.048	0.080	0.053	0.016	0.035	0.064
2	0.083	0.025	0.050	0.079	0.076	0.022	0.045	0.075
3	0.090	0.027	0.057	0.092	0.079	0.024	0.049	0.084
4	0.074	0.023	0.048	0.080	0.080	0.024	0.051	0.082