Dimensionless Assessment Method of Landslide Dam Formation Caused by Tributary Debris Flow Events

Table 1

Main characteristics of 11 tributary debris flow events during the Typhoon Morakot.

No.	Name	Latitude, longitude	The tributary stream							The main stream			Maximum 1-h rainfall intensity during Typhoon Morakot; (mm/h)	Blocking or not
			Watershed area; (10^4 m^2)	Tributary stream length; (m)	Highest elevation; (m)	Lowest elevation; (m)	Upstream slope; (°)	Downstream slope; (°)	Mean width; (m)	Upstream watershed area at the tributary site; (10^4 m^2)	Mean slope at the tributary site; (°)	Mean width at the tributary site; (m)
1	Namasha; landslide dam	N23.321; E120.746	670	4650	2278	736	17.8	0.6	10	21200	1.1	40	94.5	Y
2	Yi River; landslide dam	N23.294; E120.729	940	4502	2260	659	16.8	0.8	15	24010	1.0	45	121.0	Y
3	Putunpunas River; landslide dam	N23.194; E120.790	579	5122	2141	602	17.7	0.9	12	51888	0.7	80	115.5	Y
4	Heshe River; landslide dam	N23.568; E120.873	442	4196	2283	861	17.2	0.6	10	8242	2.1	80	85.5	Y
5	Koushe River; landslide dam	N22.818; E120.700	481	3543	1863	415	20.3	1.6	15	5200	1.4	60	119.0	Y
6	Houjue River; landslide dam	N23.192; E120.618	181	2028	951	291	17.0	0.3	10	1107	1.1	35	55.0	Y
7	Namasha DF008	N23.250; E120.694	125	2037	1089	564	16.6	1.2	10	27785	2.0	75	121.0	N
8	Taoyaun DF001	N23.168; E120.774	411	4328	2003	532	17.0	0.6	15	55210	1.0	60	115.5	N
9	Taoyaun DF006	N23.263; E120.820	157	1777	1667	741	19.2	3.5	10	39784	1.2	50	98.0	N
10	Liugui; DF009	N23.014; E120.664	456	4347	1275	258	17.9	2.2	15	84048	0.9	80	91.5	N
11	Liugui; DF014	N23.066; E120.681	549	4218	1352	324	15.9	0.2	15	79173	0.5	300	103.0	N