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- W4313256721 abstract "Stream temperature (Ts) is a key water quality parameter that controls several biological, ecological, and chemical processes in aquatic systems. In forested headwaters, exchanges of energy across air-water-streambed interfaces may influence Ts regimes, especially during storm events as the sources of runoff change over space and time. Analysis of the hysteretic behaviour of Ts during storm events may provide insights into rainfall-runoff responses, but such relationships have not been thoroughly investigated. As such, our objectives were to (a) quantify the variability of stream temperature hysteresis across seasons in different sub-regions and (b) investigate the relationship between the hysteretic response and catchment characteristics. Ts hysteresis during storm events was assessed based on the hysteresis index (HI), which describes the directionality of hysteresis loops, and the temperature response index (TRI), which indicates whether Ts increased or decreased during a storm event. We analysed Ts data from 10 forested headwater reaches in two sub-regions (McGarvey and West Fork Tectah) in Northern California. We also performed a clustering analysis to examine the relationship amongst HI, TRI, topographic metrics, and meteorological characteristics of the study areas. Overall, the hysteretic behaviour of Ts varied across seasons—the greatest HI occurred during spring and summer. Interestingly, in the McGarvey streams the variability in Ts hysteresis co-varied strongly with topographic metrics (i.e., upslope accumulative area, average channel slope, topographic wetness index). Comparatively, in West Fork Tectah the variability of Ts hysteresis co-varied most strongly with meteorological metrics (i.e., antecedent rainfall events, solar radiation, and air temperature). Variables such as the gradient between stream and air temperatures, slope, and wetted width were significant for both sub-regional hysteretic patterns. We posit that the drivers of Ts response during storms are likely dependent on catchment physiographic characteristics. Our study also illustrated the potential utility of stream temperature as a tracer for improving the understanding of hydrologic connectivity and shifts in the dominant runoff contributions to streamflow during storm events." @default.
- W4313256721 created "2023-01-06" @default.
- W4313256721 creator A5028722255 @default.
- W4313256721 creator A5043414848 @default.
- W4313256721 creator A5044571864 @default.
- W4313256721 creator A5065132278 @default.
- W4313256721 date "2023-01-01" @default.
- W4313256721 modified "2023-09-25" @default.
- W4313256721 title "Characterizing stream temperature hysteresis in forested headwater streams" @default.
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