Badania Fizjograficzne, Seria A, Tom 68, 2017
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Browsing Badania Fizjograficzne, Seria A, Tom 68, 2017 by Subject "flow coefficient (Pardé)"
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Item Identyfikacja cech reżimu odpływu rzek w Polsce na różnych poziomach grupowania(Wydawnictwo Poznańskiego Towarzystwa Przyjaciół Nauk, 2017) Wrzesiński, DariuszThe paper presents the characteristics of the river regime types in Poland which were obtained by applying the unsupervised approach to the regime based on the results of clustering rivers with respect to the values of the 12 monthly flow coefficients in the average annual cycle. In the paper were used daily flow values from the period 1971–2010 for 516 gauges located on 280 Polish rivers.On three clustering levels, 5, 9 and 12 varieties of river runoff regimes were identified and detailed. The paper also presents the spatial distribution of rivers that represent these variants.Item Typologia reżimu odpływu rzek w Polsce w podejściu nadzorowanym i nienadzorowanym(Wydawnictwo Poznańskiego Towarzystwa Przyjaciół Nauk, 2017) Wrzesiński, DariuszThe paper presents a typology of the river regime in Poland obtained with the application of a supervised approach, i.e. a classic typology according to the assumptions of Dynowska with a regime typology obtained in an unsupervised approach by means of hierarchical grouping. In both cases, the explanatory variables were monthly flow coefficients – respectively: only from spring and summer months, with predefined threshold values, or 12-month flow coefficients. The paper applied daily flow values from the period 1971– 2010 for 516 gauges located on 280 Polish rivers. In both approaches, five types of regime were designated, including rivers characterised by a similar distribution and range of monthly runoff values in an average annual cycle. The designated groups, however, differ in abundance, which affects the image of spatial distribution of rivers representing the types of regime identified. The analysis shows that irrespective of the adopted method of designation, two types of regime, namely nival poorly developed and pluvio-nival are evidently characterised by different patterns of flow variability in an average annual cycle, and concern similar groups of rivers.