Impact of cascade reservoirs on continuity of river water temperature: A temperature trend hypothesis in river

2020 ◽  
Author(s):  
You Xu ◽  
Xiaojuan Guo ◽  
Yong Dan ◽  
Zhengjian Yang ◽  
Jun Ma ◽  
...  
Keyword(s):  
Water Temperature ◽  
River Water ◽  
Temperature Trend ◽  
Cascade Reservoirs ◽  
River Water Temperature

STUDY ON CHANGING IN RIVER WATER TEMPERATURE IN KYUSYU REGION

2018 ◽  
Vol 74 (5) ◽  
pp. I_79-I_84
Author(s):  
Yoji NODA ◽  
Tomoko MINAGAWA ◽  
Hidetaka ICHIYANAGI ◽  
Akihiko KOYAMA
Keyword(s):  
Water Temperature ◽  
River Water ◽  
River Water Temperature

scholarly journals Exploring and Quantifying River Thermal Response to Heatwaves

Water ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 1098 ◽  
Author(s):  
Sebastiano Piccolroaz ◽  
Marco Toffolon ◽  
Christopher Robinson ◽  
Annunziato Siviglia
Keyword(s):  
Water Temperature ◽  
River Water ◽  
Thermal Response ◽  
Hydrological Regime ◽  
Management Policy ◽  
Extreme Weather Events ◽  
Thermal Dynamics ◽  
Depth Analysis ◽  
River Water Temperature

Most of the existing literature on river water temperature focuseds on river thermal sensitivity to long-term trends of climate variables, whereas how river water temperature responds to extreme weather events, such as heatwaves, still requires in-depth analysis. Research in this direction is particularly relevant in that heatwaves are expected to increase in intensity, frequency, and duration in the coming decades, with likely consequences on river thermal regimes and ecology. In this study we analyzed the long-term temperature and streamflow series of 19 Swiss rivers with different hydrological regime (regulated, low-land, and snow-fed), and characterized how concurrent changes in air temperature and streamflow concurred to affect their thermal dynamics. We focused on quantifying the thermal response to the three most significant heatwave events that occurred in Central Europe since 1950 (July–August 2003, July 2006, and July 2015). We found that the thermal response of the analyzed rivers contrasted strongly depending on the river hydrological regime, confirming the behavior observed under typical weather conditions. Low-land rivers were extremely sensitive to heatwaves. In sharp contrast, high-altitude snow-fed rivers and regulated rivers receiving cold water from higher altitude hydropower reservoirs or diversions showed a damped thermal response. The results presented in this study suggest that water resource managers should be aware of the multiple consequences of heatwave events on river water temperature and incorporate expected thermal responses in adaptive management policy. In this respect, additional efforts and dedicated studies are required to deepen our knowledge on how extreme heatwave events can affect river ecosystems.

scholarly journals Controls on Arctic glacier-fed river water temperature

2016 ◽  
Vol 62 (4) ◽  
pp. 499-514 ◽  
Author(s):  
Christopher J. Mellor ◽  
Stephen J. Dugdale ◽  
Grace Garner ◽  
Alexander M. Milner ◽  
David M. Hannah
Keyword(s):  
Water Temperature ◽  
River Water ◽  
Arctic Glacier ◽  
River Water Temperature

scholarly journals Changes in the Water Temperature of Rivers Impacted by the Urban Heat Island: Case Study of Suceava City

Water ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1343 ◽  
Author(s):  
Andrei-Emil Briciu ◽  
Dumitru Mihăilă ◽  
Adrian Graur ◽  
Dinu Iulian Oprea ◽  
Alin Prisăcariu ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Water Temperature ◽  
Urban Heat Island ◽  
River Water ◽  
Air Temperature ◽  
Stream Water ◽  
Heat Island ◽  
Urban Heat ◽  
The City ◽  
River Water Temperature

Cities alter the thermal regime of urban rivers in very variable ways which are not yet deciphered for the territory of Romania. The urban heat island of Suceava city was measured in 2019 and its impact on Suceava River was assessed using hourly and daily values from a network of 12 water and air monitoring stations. In 2019, Suceava River water temperature was 11.54 °C upstream of Suceava city (Mihoveni) and 11.97 °C downstream (Tişăuţi)—a 3.7% increase in the water temperature downstream. After the stream water passes through the city, the diurnal thermal profile of Suceava River water temperature shows steeper slopes and earlier moments of the maximum and minimum temperatures than upstream because of the urban heat island. In an average day, an increase of water temperature with a maximum of 0.99 °C occurred downstream, partly explained by the 2.46 °C corresponding difference between the urban floodplain and the surrounding area. The stream water diurnal cycle has been shifted towards a variation specific to that of the local air temperature. The heat exchange between Suceava River and Suceava city is bidirectional. The stream water diurnal thermal cycle is statistically more significant downstream due to the heat transfer from the city into the river. This transfer occurs partly through urban tributaries which are 1.94 °C warmer than Suceava River upstream of Suceava city. The wavelet coherence analyses and ANCOVA (analysis of covariance) prove that there are significant (0.95 confidence level) causal relationships between the changes in Suceava River water temperature downstream and the fluctuations of the urban air temperature. The complex bidirectional heat transfer and the changes in the diurnal thermal profiles are important to be analysed in other urban systems in order to decipher in more detail the observed causal relationships.

Prediction of river water temperature: a comparison between a new family of hybrid models and statistical approaches

2016 ◽  
Vol 30 (21) ◽  
pp. 3901-3917 ◽  
Author(s):  
Sebastiano Piccolroaz ◽  
Elisa Calamita ◽  
Bruno Majone ◽  
Aurélien Gallice ◽  
Annunziato Siviglia ◽  
...  
Keyword(s):  
Water Temperature ◽  
River Water ◽  
Hybrid Models ◽  
New Family ◽  
Statistical Approaches ◽  
River Water Temperature
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