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The influence of treated wastewater from the Lodz city agglomeration on the ice regime and water temperature of the Ner river

Adam Bartnik
Adam Bartnik
 e 
Paweł Jokiel
Paweł Jokiel
   | 09 lug 2021
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Pubblicato online: 09 lug 2021
Pagine: 194 - 203
Ricevuto: 03 lug 2020
Accettato: 04 mag 2021
DOI: https://doi.org/10.2478/mgrsd-2020-0061
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© 2021 Adam Bartnik et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1

Location of Ner catchment area, showing Dabie (Dąbie) water gauge and the city of Lodz (Łódź)Source: own elaboration
Location of Ner catchment area, showing Dabie (Dąbie) water gauge and the city of Lodz (Łódź)Source: own elaboration

Figure 2

Days of river ice phenomena (light blue) and river ice cover (dark blue) on the Ner river at Dabie water gauge, 1951–2017Source: own elaboration (developed using data from IMWM-NRI)
Days of river ice phenomena (light blue) and river ice cover (dark blue) on the Ner river at Dabie water gauge, 1951–2017Source: own elaboration (developed using data from IMWM-NRI)

Figure 3

Annual water usage in Lodz city agglomeration (Vu) and its cumulated quantity (Vucum), 1951–2017Source: own elaboration (developed using archival materials of the City of Lodz Office, Statistical Yearbooks of the City of Lodz, CSO Local Data Bank, and Environmental Protection and Water Management Reports)
Annual water usage in Lodz city agglomeration (Vu) and its cumulated quantity (Vucum), 1951–2017Source: own elaboration (developed using archival materials of the City of Lodz Office, Statistical Yearbooks of the City of Lodz, CSO Local Data Bank, and Environmental Protection and Water Management Reports)

Figure 4

Variability of start (dSIP – A) and end (dEIP – B) dates of ice phenomena occurrence, as well as start (dSIC – C) and end (dEIC – D) dates of ice cover appearance on the Ner river at Dabie water gauge, 1951–2017. Red lines show trends. Trend equations given in boxes; R2 – coefficients of determination; [year no.] – consecutive number of year from beginning of data series (1951 is no. 1); α – significance level of trend equations; Mann–Kendall test was used.Source: own elaboration
Variability of start (dSIP – A) and end (dEIP – B) dates of ice phenomena occurrence, as well as start (dSIC – C) and end (dEIC – D) dates of ice cover appearance on the Ner river at Dabie water gauge, 1951–2017. Red lines show trends. Trend equations given in boxes; R2 – coefficients of determination; [year no.] – consecutive number of year from beginning of data series (1951 is no. 1); α – significance level of trend equations; Mann–Kendall test was used.Source: own elaboration

Figure 5

Variability of duration of ice phenomena (DIP – A) and ice cover (DIC – B) on the Ner river at Dabie water gauge, 1951–2017. Red lines show trends. Trend equations given in boxes; R2 – coefficients of determination; [year no.] – consecutive number of year from beginning of data series (1951 is no. 1); α – significance level of trend equations; Mann–Kendall test was used.Source: own elaboration
Variability of duration of ice phenomena (DIP – A) and ice cover (DIC – B) on the Ner river at Dabie water gauge, 1951–2017. Red lines show trends. Trend equations given in boxes; R2 – coefficients of determination; [year no.] – consecutive number of year from beginning of data series (1951 is no. 1); α – significance level of trend equations; Mann–Kendall test was used.Source: own elaboration

Figure 6

Correlation between duration of ice phenomena on the Ner river (DIP) and annual mean water temperature (Mtw) in particular years within 1965–2014R2 – coefficient of determinationSource: Jokiel & Bartnik 2020
Correlation between duration of ice phenomena on the Ner river (DIP) and annual mean water temperature (Mtw) in particular years within 1965–2014R2 – coefficient of determinationSource: Jokiel & Bartnik 2020

Figure 7

Double-mass curves of cumulated duration of ice phenomena (DIPcum) and cumulated duration of ice cover (DICcum) on the Ner river at Dabie water gauge versus cumulated volume of water uptake by Lodz city agglomeration (Vucum), 1951–2017. Red lines are aligned cumulations; arrows indicate years of significant disruption of homogeneity.Source: own elaboration
Double-mass curves of cumulated duration of ice phenomena (DIPcum) and cumulated duration of ice cover (DICcum) on the Ner river at Dabie water gauge versus cumulated volume of water uptake by Lodz city agglomeration (Vucum), 1951–2017. Red lines are aligned cumulations; arrows indicate years of significant disruption of homogeneity.Source: own elaboration
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