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Issue 15 (2) 2016 pp. 41-53

Wiktoria Czech1, Karol Plesiński1, Artur Radecki-Pawlik1,2, Bartosz Radecki-Pawlik3

1University of Agriculture in Krakow
Podhale State College of Applied Sciences in Nowy Targ
Cracow University of Technology

Dominant discharge – an outline of theory and a case study from the Raba river

Keywords: dominant discharge, the Raba River, sediment transport, Wolman method, flow frequency

Designing hydraulic structures engineers has only theoretical flows, calculated using formulas based on statistics. Knowledge of the dominant discharge could help determine designers who are interested in changes of the morphology of river channels, especially in terms of sediment transport. It was observed that the designing of a stable channel in the river is possible when defining characteristic of flow in the river which is the most frequently present in the river and in the same time it carries the sediment. That is the dominant discharge. It is this movement can represent both the hydraulic system and the geometry of the river cross-sections. The dominant discharge (also called river shaping channel discharge) is considered by many authors as a discharge that transports the largest amount of sediment, it takes a long time and has an impact on the formation of the shape of the river bed. Observations of Wolman and Miller showed that low but frequent flows of water might be responsible for new shape of the river channel, erosion of the riverbed, sediment deposition and consequently changes in river morphology. The paper presents Wolman method for dominant discharge use for the Raba River for chosen gauge cross section. Along in the paper we discuss the obtained results and the consequences of using dominant discharge for the practice. In six cross sections on the river Raba, Qdd was calculated values, which range from 31 m3 · s–1 (for the section in Rabka) to 395 m3 · s–1 (in Proszówki). These flows occur every two years (for the upper sections of the river), and every four years (for cross-sections located in the lower section of the river).

pub/15_2_41.pdf Full text available in in Adobe Acrobat format:

DOI: 10.15576/ASP.FC/2016.15.2.41

For citation:

MLA Czech, Wiktoria, et al. "Dominant discharge – an outline of theory and a case study from the Raba river." Acta Sci.Pol. Form. Cir. 15.2 (2016): 41-53.
APA (2016). . Acta Sci.Pol. Form. Cir. 15 (2), 41-53
ISO 690 CZECH, Wiktoria, et al. Dominant discharge – an outline of theory and a case study from the Raba river. Acta Sci.Pol. Form. Cir., 2016, 15.2: 41-53.
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