Abstract

Stream water temperature, air temperature and streamflow were monitored continuously over a 2-yr period in a 1 km2 drainage basin above 450 m O.D. in northern England. At the basin outfall, daily maximum and minimum water temperatures generally correlated closely with the equivalent air temperatures under streamflow conditions which prevailed for 88 %0 of the time. The main discrepancies occurred during relatively short-term snowmelt or peak flow events. However, systematic sampling along the two major tributaries revealed more persistent local variations in stream temperature arising from other environmental factors. The effect of geology on baseflow contributions to the streams was particularly important and, with low flows during summer, ground water seepages produced local reductions of 4-50C.

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