Table 2. Physical environment parameters at the sampling sites

Site Substrate(%)* Water velocity (cm/sec) Water depth (cm) Water temperature (°C)
B C P G S
St. 1 15 15 20 50 15.6 ± 5.7 14.1 ± 10.1 19.2 ± 3.8
St. 2 15 20 20 45 15.4 ± 5.5 16.7 ± 4.9 20.3 ± 4.8
St. 3 10 10 10 70 9.9 ± 0.0 34.6 ± 2.9 22.7 ± 3.0
St. 4 5 5 20 35 35 12.4 ± 9.4 10.9 ± 1.5 18.7 ± 2.4
B: Boulder (>256mm), C: Cobble (64∼256mm), P: Pebble (16∼64mm), G: Grave 1(2∼16mm), S: Sand and Silt (≤2mm).