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Table 3

Observed characteristics of bank collapse in the riparian zone of selected reaches (2007–2009)

Characteristics of bank collapse
StretchTransect No.Bank compositionSlope gradientVegetation coverageHeight (m)Width (m)Toe elevation (m)Mean annual retreat rate (m/a)Total released volume (m3)
Yangtze mainstream BM1 Taupe silty clay, slightly compact 75° 40% 2.3 1.15 147 0.70 3.70 
BM2 Tawny fine sandy soil, slightly compact 85° 20% 1.8 3.65 147 2.40 31.54 
BM3 Tawny fine sand, sandy clay, slightly compact 90° 10% 4.0 6.00 149 3.50 168.00 
BM4 Taupe to tawny fine sandy soil, slightly compact 72° 36% 1.0 1.15 155 0.75 1.73 
BM5 Tawny silty clay, slightly compact 73° 37% 1.5 1.10 154 0.60 1.98 
BM6 Taupe silty clay, relatively compact 90° 10% 1.6 0.50 161 0.30 0.48 
BM7 Taupe silty clay, relatively compact 87° 20% 1.0 0.30 170 0.15 0.09 
BM8 Tawny fine sandy soil, slightly compact 50° 35% 2.0 0.70 171 0.35 0.98 
BM9 Taupe to tawny fine sandy soil, slightly compact 45° 35% 1.6 0.60 169 0.30 0.58 
Ruxi tributary BT1 Taupe silty clay, relatively compact 90° 45% 1.7 0.40 148 0.25 0.34 
BT2 Taupe silty clay, relatively compact 80° 25% 1.0 0.40 147 0.30 0.24 
BT3 Taupe to tawny silty clay, slightly compact 85° 36% 1.5 0.60 146 0.45 0.81 
BT4 Taupe silty clay, relatively compact 70° 40% 1.0 0.20 158 0.10 0.04 
BT5 Taupe silty clay, relatively compact 72° 35% 1.2 0.20 156 0.15 0.072 
BT6 Taupe silty clay, relatively compact 85° 36% 1.5 0.40 161 0.20 0.24 
BT7 Taupe silty clay, relatively compact 85° 36% 2.0 0.10 170 0.05 0.02 
BT8 Taupe silty clay, relatively compact 71° 35% 1.7 0.20 171 0.10 0.068 
BT9 Taupe silty clay, relatively compact 50° 35% 1.2 0.10 170 0.05 0.012 
Characteristics of bank collapse
StretchTransect No.Bank compositionSlope gradientVegetation coverageHeight (m)Width (m)Toe elevation (m)Mean annual retreat rate (m/a)Total released volume (m3)
Yangtze mainstream BM1 Taupe silty clay, slightly compact 75° 40% 2.3 1.15 147 0.70 3.70 
BM2 Tawny fine sandy soil, slightly compact 85° 20% 1.8 3.65 147 2.40 31.54 
BM3 Tawny fine sand, sandy clay, slightly compact 90° 10% 4.0 6.00 149 3.50 168.00 
BM4 Taupe to tawny fine sandy soil, slightly compact 72° 36% 1.0 1.15 155 0.75 1.73 
BM5 Tawny silty clay, slightly compact 73° 37% 1.5 1.10 154 0.60 1.98 
BM6 Taupe silty clay, relatively compact 90° 10% 1.6 0.50 161 0.30 0.48 
BM7 Taupe silty clay, relatively compact 87° 20% 1.0 0.30 170 0.15 0.09 
BM8 Tawny fine sandy soil, slightly compact 50° 35% 2.0 0.70 171 0.35 0.98 
BM9 Taupe to tawny fine sandy soil, slightly compact 45° 35% 1.6 0.60 169 0.30 0.58 
Ruxi tributary BT1 Taupe silty clay, relatively compact 90° 45% 1.7 0.40 148 0.25 0.34 
BT2 Taupe silty clay, relatively compact 80° 25% 1.0 0.40 147 0.30 0.24 
BT3 Taupe to tawny silty clay, slightly compact 85° 36% 1.5 0.60 146 0.45 0.81 
BT4 Taupe silty clay, relatively compact 70° 40% 1.0 0.20 158 0.10 0.04 
BT5 Taupe silty clay, relatively compact 72° 35% 1.2 0.20 156 0.15 0.072 
BT6 Taupe silty clay, relatively compact 85° 36% 1.5 0.40 161 0.20 0.24 
BT7 Taupe silty clay, relatively compact 85° 36% 2.0 0.10 170 0.05 0.02 
BT8 Taupe silty clay, relatively compact 71° 35% 1.7 0.20 171 0.10 0.068 
BT9 Taupe silty clay, relatively compact 50° 35% 1.2 0.10 170 0.05 0.012 
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