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Hydrological Dry Periods versus Atmospheric Circulations in the Lower Vistula Basin (Poland) in 1954–2018


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Fig. 1

Research Area. Explanations: Numbering of gauging sites according to Table 1.
Research Area. Explanations: Numbering of gauging sites according to Table 1.

Fig. 2

Basic parameters of the distribution of mean annual specific discharges of the studied rivers in 1954–2018.
Basic parameters of the distribution of mean annual specific discharges of the studied rivers in 1954–2018.

Fig. 3

The course of annual SSI on selected rivers: Drwęca (the highest mean multi-year flow), Wierzyca (average mean multi-year flow) and Zgłowiączka (the lowest mean multi-year flow) in 1954–2018. SSI, Standardised Streamflow Index.
The course of annual SSI on selected rivers: Drwęca (the highest mean multi-year flow), Wierzyca (average mean multi-year flow) and Zgłowiączka (the lowest mean multi-year flow) in 1954–2018. SSI, Standardised Streamflow Index.

Fig. 4

The course of annual values of circulation indices (W, S and C) in the research area in 1954–2018 (hydrological year from November to October).
The course of annual values of circulation indices (W, S and C) in the research area in 1954–2018 (hydrological year from November to October).

Fig. 5

The course of dry periods (SSI-12) on analysed rivers in 1954–2018. SSI, Standardised Streamflow Index.
The course of dry periods (SSI-12) on analysed rivers in 1954–2018. SSI, Standardised Streamflow Index.

Fig. 6

The course of monthly indices of atmospheric circulation (C-12, S-12, W-12) and SSI-12 exemplified by the Brda River in 1954–2018. SSI, Standardised Streamflow Index.
The course of monthly indices of atmospheric circulation (C-12, S-12, W-12) and SSI-12 exemplified by the Brda River in 1954–2018. SSI, Standardised Streamflow Index.

Basic statistics of the mean annual flow of the studied rivers and the p-value of the MK test for trend in 1954–2018.

No.River/gauging sitesCatchment area* (km2)Mean specific discharge (dm3 · s−1 · km−2)Mean flow (m3 · s−1)Minimum flow (m3 · s−1) (year)Maximum flow (m3 · s−1) (year)Standard deviation (m3 · s−1)Statistics MK testp-value MK test
1Skrwa Prawa/Parzeń1490.34.196.242.13 (2016)11.37 (2002)2.49−0.0570.9549
2Zgłowiączka/Włocławek Ruda1491.82.403.590.64 (2016)9.98 (1980)1.98−1.0360.3002
3Drwęca/Elgiszewo5019.55.5627.9213.08 (2015)42.84 (1982)6.51−0.7190.4721
4Brda/Tuchola2477.27.8719.5014.22 (1992)25.93 (2011)2.42−0.3680.7129
5Wda/Czarna Woda827.67.576.274.33 (1992)9.08 (1962)1.02−1.6870.0915
6Osa/Rogoźno1135.13.934.471.36 (2015)9.17 (1982)1.78−1.9080.0564
7Wierzyca/Brody Pomorskie1543.45.648.705.40 (1992)12.87 (1982)1.72−1.5740.1155

Characteristics of a dry period on the analysed rivers and the values of atmospheric circulation indices in 1990–1994* and 2014–2017*.

RiverPeriodSSI-12 0.0 ÷ −1.0SSI-12 −1.0 ÷ −1.5SSI-12 −1.5 ÷ −2.0SSI-12 <−2.0Min. value of SSI-12Mean value of SSI-12Total duration [months]C-12 (mean)S-12 (mean)W-12 (mean)
1990–1994*
Skrwa PrawaDec 1990–Dec 1994172156−2.07−1.2349−30.59−33.78159.57
ZgłowiączkaJan 1990–Feb 1994323186−2.08−1.5150−25.76−31.56156.88
Drwęca
BrdaFeb 1990–Oct 199524131814−2.45−1.3369−14.14−20.75158.29
WdaSep 1991–Sep 19951912612−2.35−1.2349−15.16−13.39151.06
OsaJan 1990–Feb 199435780−1.68−0.9050−25.76−31.56156.88
WierzycaJan 1990–Mar 1994261168−2.26−1.1151−23.41−30.18156.10
2014–2017*
Skrwa PrawaJan 2015–Sep 2017541311−2.26−1.6333−64.8528.15138.51
ZgłowiączkaJan 2013–Jan 20182610718−2.48−1.3061−36.9829.93122.92
DrwęcaApr 2014–Oct 201766922−2.71−1.8643−51.0434.02129.74
BrdaJun 2014–Aug 2017881013−2.43−1.5839−55.2835.74130.46
WdaJun 2014–Sep 20177101112−2.33−1.5440−54.3835.00130.25
OsaMay 2014–Oct 201777820−2.59−1.7842−52.3833.79130.35
WierzycaMay 2014–Apr 201749617−2.46−1.7436−52.1640.41128.47

Relationship between dry periods in the analysed rivers and atmospheric circulation indices in 1954–2018.

No.RiverSSI-12/C-12SSI-12/S-12SSI-12/W-12
Spearman's Corelation Coefficientp-valueSpearman's Corelation Coefficientp-valueSpearman's Corelation Coefficientp-value
1Skrwa Prawa0.44<0.00010.030.6677−0.200.0050
2Zgłowiączka0.36<0.00010.190.0117−0.51<0.0001
3Drwęca0.34<0.0001−0.34<0.00010.130.1034
4Brda0.35<0.00010.080.2605−0.160.0267
5Wda0.40<0.00010.090.24940.030.6647
6Osa0.170.0134−0.29<0.00010.090.1644
7Wierzyca0.35<0.0001−0.30<0.00010.020.7747

Characteristics of annual atmospheric circulation indices: western zonal (W), southern meridional (S) and cyclonicity (C) in the analysed area and p-value of the MK test for the trend in 1954–2018 (hydrological year from November to October).

No.Circulation indexMeanMaximum (year)Minimum (year)Standard deviationStatistics MK testp-value MK test
1W114.6226 (1983)−48 (1960)54.42.7350.0062
2S0.788 (1960)−57 (1997)31.7−0.1700.8651
3C− 24.7110 (2001)−178 (1959)54.60.5320.5945

Characteristics of dry periods on the analysed rivers in 1954–2018.

No.RiverTotal number of dry periodsTotal number of monthsMax. number of months during one dry periodMin. number of months during one dry period
1Skrwa Prawa9196493
2Zgłowiączka6170618
3Drwęca71634311
4Brda8203696
5Wda61804913
6Osa9217504
7Wierzyca10194513
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Temas de la revista:
Geosciences, Geography