Evolution of Hydrological Drought in Human Disturbed Areas: A Case Study in the Laohahe Catchment, Northern China

Figure 9

Identified hydrological droughts (with 70-percentile threshold derived from the baseline period) during 1980–2009 from (a) observed runoff and (b) simulated runoff series, and (c) is the difference between observed and simulated runoff series representing the net effect of human activities on drought.

(a)

(b)

(c)