Impacts of Climate Variability and Human Activities on the Changes of Runoff and Sediment Load in a Catchment of the Loess Plateau, China

Table 3

Impacts of precipitation () and human activities (HA) on changes of runoff (10⁹ m³).

	Period	Observed runoff	Estimated runoff	Impact of	Impact of HA
Annual scale	1955–1979	0.173
	1980–1996	0.117	0.131	0.014 (24.4%)	0.042 (75.6%)
	1980–2010	0.039	0.139	0.033 (25.1%)	0.1 (74.9%)
Flood season	1955–1979	0.127
	1980–1996	0.103	0.109	0.006 (25.9%)	0.0018 (74.1%)
	1980–2010	0.038	0.112	0.015 (17.1%)	0.074 (82.9%)