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Stream water temperature: a short review with special reference to diurnal dynamics

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Łaszewski M.
Miscellanea Geographica. Regional Studies on Development
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2013
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vol. 17
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issue 1
34-41
EN
Dynamic changes in stream water temperature are caused by thermal energy exchange at the interface between the water and the atmosphere, and between the water and the streambed. This heat flux is the result of physical processes which are stimulated by external drivers that control water temperature both in temporal and spatial scales. For streams, the most characteristic are diurnal fluctuations of temperature. For the purposes of this paper, electronic data loggers were used which allowed a presentation of the diurnal cycles of water temperature in a small lowland river. The measurements confirmed that meteorological conditions have a significant impact on the diurnal dynamics of stream temperature.
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Metody określania związków temperatury wody rzecznej i temperatury powietrza na przykładzie rzeki Świder

100%
Łaszewski M.
Prace Geograficzne
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2014
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issue 136
PL
Methods of estimating stream water temperature and air temperature relationships – the Świder River case studyDue to the high significance of water temperature to lotic ecosystems, this paper presents the methods of estimating relationships between water temperature and air temperature on the example of the Świder River. Statistical relationships were determined using logistic and linear regression models for daily, weekly and monthly average temperatures, as well as for daily maximum and average weekly maximum temperatures. The data were obtained as a result of field measurements, conducted in the hydrological years 2012 and 2013. A strong non-linear relationship was found between water and air temperature, as indicated by the obtained coefficients of determination and the R M S E of logistic models. Despite the non- -linear nature of this relationship, the appropriate selection of measurement data allows the efficient use of linear models. A comparison of fit measures of the models based on microclimatic data (Wólka Mlądzka) and meteorological station data (Warszawa-Okęcie) revealed no significant differences in their quality. The results may have practical application for the fisheries management and the protection of the ecosystem of the Świder River.
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