Table 4. Physical environment parameters at each sampling sites

Site	Sustrate(%)*					River width (m)	Water width (m)	Water temperature (℃)	Turbidity (NTU)
	B	C	P	G	S
St. 1	43	19	19	10	9	4.2	3.2	10.3	1.11
St. 2	24	19	13	12	32	12.3	5.7	14.0	2.10
St. 3	5	12	38	42	3	15.2	9.8	11.9	1.05
St. 4	2	4	31	28	35	14.9	6.6	11.5	1.26
St. 5	6	6	52	33	3	12.0	3.9	14.0	2.27

B: boulder (>256mm), C: cobble (64~256mm), P: pebble (16~64mm), G: gravel (2~16mm), S: sand and silt(≤ 2mm).