Abstract
Temperature is regularly used as a tracer in several fields within hydrology such as the study of interactions between the river channel and the local hyporheic environment and in the investigation of deeper groundwater flow pathways. However, it is rarely used to help investigate flow pathways within river catchments, and two examples of its use in this field are demonstrated here. The work uses recent advances that allow simple, cheap, yet accurate stream and soil temperature measurements in combination with existing physically-based models for the full energy and water cycle. Measurements of stream and soil temperatures in the Eastergrounds hollow in the Slapton Wood catchment, Devon, have been carried out. Analysis of the data and modelling of water flow and heat transport using SHETRAN suggests deeper pathways for the subsurface stormflow that had previously been thought. Measurements of stream temperatures in paired subcatchments of the Dunsop catchment, Bowland Forest, Lancashire, are on-going. These catchments are dominated by surface or near-surface flow but show very different stream temperature responses.
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