Table 1: Development features of 19 debris flow channels along Ya-Lu highway.

No. Name Watershed area
(km2)
Averaged slope gradient (%) Distance to the active fault (km) Angle between channel to active fault (°) Gully type Scale Developing stage
D01 Guanjia Gully 6.11 23.3 35.85 14.54 C-type M P
D02 Xiaoheda Gully 48.59 14.5 17.73 5.19 C-type L P
D03 Tianbagan Gully 8.01 30.56 34.21 23.07 C-type M E
D04 Shengjia Gully 1.24 42.32 34.95 27.04 S-type M P
D05 Xiaosha Gully 1.74 35.3 41.92 26.55 C-type M P
D06 Dasha Gully 12.57 21.49 44.93 51.07 C-type M P
D07 Yejidong Gully 0.97 21.57 2.37 29.13 C-type M P
D08 Xiaogouer Gully 12.85 15.73 1.01 42.76 C-type M E
D09 Que’er Gully 14.08 15.73 1.64 51.33 C-type M D
D10 Shekeniluo Gully 0.77 26.97 2.21 67.51 C-type M P
D11 Tuobie Gully 19.99 22.9 2.08 88.82 S-type S E
D12 Ma’an Gully 10.68 32.2 2.21 73.23 C-type M E
D13 Chunhe Gully 11.79 17.9 2.67 89.21 C-type S P
D14 Lamafang Gully 4.23 17.7 3.51 70.31 C-type S E
D15 Geli Gully 16.99 31.5 0.31 76.66 C-type L P
D16 Shihuiyao Gully 5.81 29.1 1.79 75.27 C-type M P
D17 Tiaoshui Gully 0.83 31 3.56 48.26 C-type S E
D18 Xiaobaozi Gully 1.94 25.6 4.1 21.82 C-type S P
D19 Shilong Gully 0.41 21.2 5.45 86.53 C-type S E