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Low-flow discharge deficits assessment, applying constant and variable low-flow threshold levels, as illustrated with the example of selected catchments in the Vistula River basin

100%

Tomaszewski E.

Acta Scientiarum Polonorum. Formatio Circumiectus

2018

tom 17

nr 3

In the present study, we have assessed low-flow discharge deficits, and the characteristics of the low flows at a constant and variable (monthly) low-flow threshold. The low-flow truncation level was identified based on the 70th percentile from the flow duration curve (Q70%). Q95% was assumed to be the threshold for the deep low-flow discharge. Thirteen catchments in the Vistula basin, varying in size, river regime, and physico-geographical conditions, were selected for the study. The input data was a series of daily discharge data sets from the period 1951–2016, made available by IMGW-PIB (Polish Institute of Meteorology and Water Management – National Research Institute). Analyses were conducted of drought flow discharge deficit volume in absolute and relative values, and low-flow duration and deficits contributing to severe low-flows were calculated for temporal scales of months and years. Comparison of the obtained results led us to the determination of the basic factors affecting the formation of low-flow deficits, and the indication of restrictions when applying fixed and variable criteria for identifying river low-flows.

The occurrence of M74 syndrome in sea trout (Salmo trutta m. trutta L.) individuals returning to spawn in the Polish rivers of the Vistula catchment area

58%

Czeczuga B., Bartel R., Czeczuga-Semeniuk E., Kosielinski P., Grochowski A.

Archives of Polish Fisheries

2005

tom 13

nr 1

The occurrence of M74 syndrome in female sea trout, Salmo trutta m. trutta, belonging to two populations returning to spawn in Polish rivers in the fall of 2003 and three from pond cultivation were investigated. Eggs from a total of 250 female specimens were investigated from rivers in northern Poland (10 – Parsęta, 100 – Miastko, 140 – Świbno). The study method applied involved comparing the concentrations in eggs of red (astaxanthin, canthaxanthin) and yellow (lutein, zeaxanthin) carotenoids. The specific carotenoids were determined with column chromatography (CC), thin layer chromatography (TLC), and high performance liquid chromatography (HPLC). The eggs of the investigated female sea trout were divided into three groups according to color: yellow, yellow-orange, and orange. Fifteen carotenoids were identified in the investigated sea trout females. Red carotenoids dominated in orange and yellow-orange eggs, while yellow ones dominated in yellow eggs. M74 syndrome was identified in 35 females, which represented 14.0% of all the investigated sea trout.

Ograniczanie wyników

1 Acta Scientiarum Polonorum. Formatio Circumiectus

1 Archives of Polish Fisheries

1 Bartel R.

1 Czeczuga B.

1 Czeczuga-Semeniuk E.

1 Grochowski A.

1 Kosielinski P.

1 Tomaszewski E.

1 2018

1 2005

Wyniki wyszukiwania

Low-flow discharge deficits assessment, applying constant and variable low-flow threshold levels, as illustrated with the example of selected catchments in the Vistula River basin

The occurrence of M74 syndrome in sea trout (Salmo trutta m. trutta L.) individuals returning to spawn in the Polish rivers of the Vistula catchment area