Influences of Urban Discharges and Urban Heat Effects on Stream Temperature

Kolath, Anja Svane; Egemose, Sara

doi:10.3390/hydrology10020030

Cited by 4 publications

(4 citation statements)

References 57 publications

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“…We did not evaluate land use patterns in our study, but we note that urbanization is more extensive within the Antietam Creek watershed than within the Sleepy Creek watershed (i.e., Hagerstown PWVAS 6 within Antietam Creek watershed has a population > 43,000 whereas the Sleepy Creek watershed is comprised of small, incorporated towns; U.S. Census Bureau 2020). However, urbanization alone cannot explain our results because sites in the Antietam watershed exhibited more resiliency whereas urbanization is expected to increase thermal sensitivity and mean stream temperature (Kolath and Egemose 2023). Rather, our findings are consistent with prior research demonstrating a protective effect of karst groundwater on stream fish communities in urbanizing landscapes (Kollaus et al 2015) and agricultural landscapes (Hitt et al 2023).…”

Section: Discussionsupporting

confidence: 84%

Karst Terrain Promotes Thermal Resiliency in Headwater Streams

Kessler

Rogers

Marsh

et al. 2023

Proc. W. Va. Acad. Sci.

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The response of stream ecosystems to climate change will depend in part on groundwater processes that reduce the sensitivity of streams to atmospheric conditions. We investigated the thermal sensitivity of streams across a gradient of groundwater inputs defined by karst terrain (carbonate parent materials) in the headwaters of the Potomac River basin in eastern North America. We collected stream temperature data and quantified thermal sensitivity for 30 sites from the relationship between daily mean water and air temperatures. Our analysis demonstrates that thermal sensitivity is lower for streams in karst terrain than elsewhere, and that the effect of karst terrain is more important than effects of elevation or basin size in this regard. Our study indicates the importance of karstic groundwater for stream thermal resiliency and suggests the importance of riparian vegetation for maintaining stream temperatures elsewhere. Our study also provides a simple and rapid method for climate change research that can be implemented in conjunction with watershed organizations and citizen science networks.

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Section: Discussionsupporting

confidence: 84%

Karst Terrain Promotes Thermal Resiliency in Headwater Streams

Kessler

Rogers

Marsh

et al. 2023

Proc. W. Va. Acad. Sci.

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“…Future studies about the temperature jumps of urban streamwaters after rainfalls should rely more on data from high frequency measurements (<1 h sampling frequency) in order to observe the details of the "first heat flush" [29,30] that occurs immediately after a rainfall; high temporal frequency data might include higher temperature peaks than the lower frequency measurements were able to record.…”

Section: Complex Causes Lead To Complex Effectsmentioning

confidence: 99%

Section: Complex Causes Lead To Complex Effectsmentioning

confidence: 99%

Urban Stream Temperature Surge—Streamwater Temperature Variability after Rainfall in Suceava City Metropolitan Area

et al. 2023

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Suceava city is a territory under the urban heat island effect that leads to warm runoffs into small urban streamwaters that are highly impacted by the thermal pollution due to a combination of the small stream discharge and important runoff from impervious urban surfaces. This research detects the frequency and specificities of temperature surges in the Suceava city metropolitan area–40 surges were certainly identified in ~2 years-long time series. We analyzed the diurnal cycles of the stream temperature and correlated the atmospheric precipitation with some heated surface runoffs that resulted in aperiodic increases in the stream temperature. The high variability of rainfalls in the urban area meant that the stream temperature surges occurred rarely in all streams during the same rainfall event, despite the small distances between the watersheds (1–5 km between adjacent water monitoring points). The surges lasted up to 10 h and had an amplitude of up to 5.2 °C; they usually lasted 3.9–5.6 h after 5.8–7.7 mm rainfalls, causing temperature peaks of 0.5–1.4 °C. Additionally, they were easier to detect in the Cetăţii Creek due to its colder-than-natural waters during the warm season—a result of important wastewater discharge. Overall, the surges occurred mostly during the warm and wet semester of the year (87.5%) and especially during the summer (50%). Because Suceava is an average Romanian city, our findings could be taken into account as relevant data at least for cities located in the Moldavian Plateau.

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“…Kolath and Egemose [11] focused on the less-studied field of the collective impact of the urban heat island (UHI) and stormwater discharges on stream temperature, especially regarding seasonal changes. In this study, the temperature effect of the urban village Aarslev on Vindinge stream in southern Denmark was examined, and it was concluded that the rise in temperature through the village was due to the UHI.…”

mentioning

confidence: 99%