Trends and multi‐annual variability of water temperatures in the river Danube, Serbia

Basarin, Biljana; Lukić, Tin; Pavić, Dragoslav; Wilby, Robert L.

doi:10.1002/hyp.10863

Cited by 51 publications

(34 citation statements)

References 71 publications

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“…Rivers with transformed hydromorphological conditions may experience alterations of physico-chemical and biological elements that serve as references for determining their ecological condition [70]. The erection of barrages on rivers or their stretches and the artificial control of water flow by means of canals are commonly considered as factors impeding the restoration of the historical thermal regime of watercourses [22,26,71,72]. Under such circumstances, the time series of thermal data may be devoid of homogeneity, which is equated with non-stationarity.…”

Section: Discussionmentioning

confidence: 99%

Distribution Properties of a Measurement Series of River Water Temperature at Different Time Resolution Levels (Based on the Example of the Lowland River Noteć, Poland)

Graf

2018

Water

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The paper investigates the distribution properties of measurement series of river water temperatures for the lowland River Noteć and its tributaries (Western Poland), as well as air temperatures at different data time resolution levels (1987-2013). The aspect of distribution normality was examined in quantile plots, the series' stationarity was assessed with an augmented Dickey-Fuller test, while autocorrelation was studied using an Autoregressive Integrated Moving Average (ARIMA) model. It was demonstrated that distributions of river water and air temperature series at different levels of analyses are generally close to normal but also display a certain skewness. Both daily temperature measurement series are stationary series. The periodic component accounts for about 93% (water temperature) and 77% (air temperature) of the daily variability of the variable, while the random factor equals 6-7% and 22%, respectively. The Autoregressive Integrated Moving Average (ARIMA) model confirmed a clear annual seasonality in temperature distribution and indicated the long memory of the autoregressive process AR (2-4). The temperature prediction performed on the basis of a 4th-order Fourier series is consistent with the course of historical data. In the multiannual period 1987-2013, particularly high maximum temperatures were recorded for the Upper Noteć in the summer half-years (28.4 • C); these are related to anthropogenic factors and increase the threat to the existence of cyprinids and salmonids. The thermal anomalies identified in the River Noteć clearly point to the necessity of intensifying the monitoring of its waters.

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Section: Discussionmentioning

confidence: 99%

Distribution Properties of a Measurement Series of River Water Temperature at Different Time Resolution Levels (Based on the Example of the Lowland River Noteć, Poland)

Graf

2018

Water

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“…Detailed knowledge on transformations of rivers in reference to particular regions for which water frequently constituted and constitutes the key element of development is of high importance. e majority of research concerning water temperature fluctuations in rivers conducted in different regions of the world (Floury et al 2012, Caldwell et al 2015, Basarin et al 2016, Liu et al 2018 shows an increasing tendency, particularly determined by climate changes. e situation is modified by human activity that can include wastewater inflows (Łaszewski 2018), construction of dams (Kędra, Wiejaczka 2018), and use of land in the catchments and on banks of rivers (Dugdale et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Long-term temperature fluctuations in rivers of the Fore-Sudetic region in Poland

Ptak

2018

Geografie

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The paper presents an analysis of water temperature fluctuations in four rivers: Nysa Łużycka, Bóbr, Bystrzyca, and Nysa Kłodzka, in south-west Poland (Fore-Sudetic region) in the period 1971–2014. The obtained results show an evident increase in water temperature ranging from 0.15 °C·dec/1 to 0.33 °C·dec/1. Such changes were particularly determined by changes in air temperature. Water temperature increased in two analyzed stations: Zielona Góra and Wrocław by 0.37 and 0.35 °C·dec/1, respectively. While the variability of the rate of warming of particular rivers in the analyzed region should be associated with local factors occurring in the catchments, the contribution of forest cover is of key importance. A change in water temperature constituting its primary parameter will cause further transformation of the discussed river ecosystems. Combined with poor water quality, rising water temperatures can become a factor inhibiting further economic development of the Fore-Sudetic region in Poland.

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“…Thus, the main difference is in the case of February -the value of R for the HS Šabac is not statistically significant, while for the HS Belgrade it is statistically significant at p≤0.05. Basarin, Lukić, Pavić and Wilby (2016) also found statistically significant correlation between the water temperature and the NAO index for winter period at Bogojevo station. At the same station they observed the growth of the seasonal maximum water temperature (0.05 °C per year on average).…”

Section: Resultsmentioning

confidence: 54%

The North Atlantic Oscillation (NAO) and the water temperature of the Sava River in Serbia

Milenković¹,

Savić²,

Walker³

et al. 2017

J GEOGR INST CVIJIC

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The data on the water temperature of the Sava in Serbia (hydrological stations Šabac and Belgrade, period 1961-2015) were used for the research, as well as the data on the surface air temperature. The temperature trends were determined and the significance (at p≤0.05 and p≤0.01) was established on the basis of the t-test. The Pearson correlation coefficient (R) was used for the calculation of the correlation. Increasing trends of the water temperature of the Sava were recorded in all cases at both stations. However, in the case of the HS Šabac, the trends for 6 months (February-April and September-November) were not statistically significant. In the case of the HS Belgrade, all the calculations (except for April) showed statistically significant increasing trends, which can be explained by anthropogenic influence. High level of correlation between the surface air temperature and the water temperature was also determined. In this research, the lowest values of R were recorded for October (0.561 for Belgrade), and on the seasonal level, for autumn (0.625 for Šabac). The research on the correlation between the water temperature of the Sava River and the NAO index showed the highest values of R for January (0.512 for HS Šabac and 0.528 for HS Belgrade). On the seasonal level, the highest values were recorded for winter (0.422 for HS Šabac and 0.432 for HS Belgrade).

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Trends and multi‐annual variability of water temperatures in the river Danube, Serbia

Cited by 51 publications

References 71 publications

Distribution Properties of a Measurement Series of River Water Temperature at Different Time Resolution Levels (Based on the Example of the Lowland River Noteć, Poland)

Distribution Properties of a Measurement Series of River Water Temperature at Different Time Resolution Levels (Based on the Example of the Lowland River Noteć, Poland)

Long-term temperature fluctuations in rivers of the Fore-Sudetic region in Poland

The North Atlantic Oscillation (NAO) and the water temperature of the Sava River in Serbia

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