Influences of Urban Discharges and Urban Heat Effects on Stream Temperature
Urban areas with dark and impermeable surfaces are known to have a heating effect on air and still water compared to surrounding areas, called the urban heat island effect (UHI). UHI and stormwater discharges’ collective impact on stream temperature, especially regarding seasonal changes, is a less-...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2023-01-01
|
| Series: | Hydrology |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2306-5338/10/2/30 |
| _version_ | 1797620653666336768 |
|---|---|
| author | Anja Svane Kolath Sara Egemose |
| author_facet | Anja Svane Kolath Sara Egemose |
| author_sort | Anja Svane Kolath |
| collection | DOAJ |
| description | Urban areas with dark and impermeable surfaces are known to have a heating effect on air and still water compared to surrounding areas, called the urban heat island effect (UHI). UHI and stormwater discharges’ collective impact on stream temperature, especially regarding seasonal changes, is a less-studied field. In this study, the temperature effect of the urban village Aarslev on Stream Vindinge in Southern Denmark was examined. Loggers (ID A–L) were placed in Stream Vindinge in 2020–2021, measuring temperature (°C) and pressure (kPa). Outlets were analyzed with respect to origin: Direct stormwater outlets (rain ÷ basin), stormwater delayed by ponds (rain + basin), common overflow, and common sewage from WWTP. Data showed the stream temperature rise through Aarslev village in all months (except March) with 0.3–1.9 °C, most notably in the summer months. A one-way ANOVA confirmed that the upstream station A and downstream station K were significantly different (<i>p</i>-values < 0.001). No significant difference in temperatures between the different outlet types was found. An increase in stream temperature was observed in response to rain events, followed by a temperature decrease. This was assumed to be a “first heat flush”. This was speculated to mean less optimal conditions for trout and sensitive macroinvertebrates not because of heat shock, but rather to lower O<sub>2</sub> concentrations and higher mineralization. River and lake temperatures are projected to increase, and this effect might become more pronounced. A decrease in stream temperature was observed after the village (station L). Therefore, it was concluded that the rise in temperature through the village was due to UHI. |
| first_indexed | 2024-03-11T08:44:40Z |
| format | Article |
| id | doaj.art-1ff933bd89e84b58824f6d7fe3046679 |
| institution | Directory Open Access Journal |
| issn | 2306-5338 |
| language | English |
| last_indexed | 2024-03-11T08:44:40Z |
| publishDate | 2023-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Hydrology |
| spelling | doaj.art-1ff933bd89e84b58824f6d7fe30466792023-11-16T20:51:33ZengMDPI AGHydrology2306-53382023-01-011023010.3390/hydrology10020030Influences of Urban Discharges and Urban Heat Effects on Stream TemperatureAnja Svane Kolath0Sara Egemose1Department of Biology, University of Southern Denmark, DK-5230 Odense, DenmarkDepartment of Biology, University of Southern Denmark, DK-5230 Odense, DenmarkUrban areas with dark and impermeable surfaces are known to have a heating effect on air and still water compared to surrounding areas, called the urban heat island effect (UHI). UHI and stormwater discharges’ collective impact on stream temperature, especially regarding seasonal changes, is a less-studied field. In this study, the temperature effect of the urban village Aarslev on Stream Vindinge in Southern Denmark was examined. Loggers (ID A–L) were placed in Stream Vindinge in 2020–2021, measuring temperature (°C) and pressure (kPa). Outlets were analyzed with respect to origin: Direct stormwater outlets (rain ÷ basin), stormwater delayed by ponds (rain + basin), common overflow, and common sewage from WWTP. Data showed the stream temperature rise through Aarslev village in all months (except March) with 0.3–1.9 °C, most notably in the summer months. A one-way ANOVA confirmed that the upstream station A and downstream station K were significantly different (<i>p</i>-values < 0.001). No significant difference in temperatures between the different outlet types was found. An increase in stream temperature was observed in response to rain events, followed by a temperature decrease. This was assumed to be a “first heat flush”. This was speculated to mean less optimal conditions for trout and sensitive macroinvertebrates not because of heat shock, but rather to lower O<sub>2</sub> concentrations and higher mineralization. River and lake temperatures are projected to increase, and this effect might become more pronounced. A decrease in stream temperature was observed after the village (station L). Therefore, it was concluded that the rise in temperature through the village was due to UHI.https://www.mdpi.com/2306-5338/10/2/30urban heat island effectstream temperatureurban environmentyearly variationsdifferent outlet typesheat shock |
| spellingShingle | Anja Svane Kolath Sara Egemose Influences of Urban Discharges and Urban Heat Effects on Stream Temperature Hydrology urban heat island effect stream temperature urban environment yearly variations different outlet types heat shock |
| title | Influences of Urban Discharges and Urban Heat Effects on Stream Temperature |
| title_full | Influences of Urban Discharges and Urban Heat Effects on Stream Temperature |
| title_fullStr | Influences of Urban Discharges and Urban Heat Effects on Stream Temperature |
| title_full_unstemmed | Influences of Urban Discharges and Urban Heat Effects on Stream Temperature |
| title_short | Influences of Urban Discharges and Urban Heat Effects on Stream Temperature |
| title_sort | influences of urban discharges and urban heat effects on stream temperature |
| topic | urban heat island effect stream temperature urban environment yearly variations different outlet types heat shock |
| url | https://www.mdpi.com/2306-5338/10/2/30 |
| work_keys_str_mv | AT anjasvanekolath influencesofurbandischargesandurbanheateffectsonstreamtemperature AT saraegemose influencesofurbandischargesandurbanheateffectsonstreamtemperature |