Supporting Information
Appendix S1
Fiber-optic Distributed Temperature Sensing (DTS) has been widely applied in
various hydrologic fields to measure the thermal variations of streams (Selker et al.
2006b; Westhoff et al. 2007; Briggs et al. 2011; Krause et al. 2012; Henderson et al.
2009; Vogt et al. 2010), wetlands (Lowry et al. 2007), saltmarsh channels (Moffett et
al. 2008), soils (Steele-Dunne et al. 2010; Sayde et al. 2010; Selker et al. 2010), and
lakes (Selker et al. 2006a, Suarez et al. 2011, Sebok et al. 2013).
Figure S1. DTS measured streambed temperature distribution over a 500m river
channel in the Heihe River Basin (inset). At most locations (horizontal axis), the
temperature fluctuated throughout the day and night with the air temperature (vertical
axis). However, about 50m and 150m from the start of the measurement point, stream
water showed consistently low temperature, indicating discharge of colder
groundwater into warmer stream water (after Huang et al. 2012).
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