Exceedance probability of selected low characteristic flows in mountain catchments

• Autorzy: Weglarczyk S.
• Języki publikacji: EN

Abstrakty

EN

In Polish hydrology and water management the term characteristic flow exists denoting a specific value of flow at the given cross-section of a river calculated as the long-term minimum, mean, median or maximum calculated using the annual minimum, mean, median or maximum flow taken for each year from a series of (usually) daily flows. Some of these characteristic flows are used to define the low-flow (o drought) periods while the another criterion: a percentage flow Qp taken from the long-term flow duration curve is also widely used. In the paper the study on the frequency structure the empirical exceedance probability of a given characteristic flow made for some low and average characteristic flows (SNQ, WNQ, NSQ and SSQ) is presented. The results show that the exceedance probability of a given characteristic flow is variable, and the amount of this variability may be large, as is the case of WNQ and NSQ. So assigning a characteristic flow to a single FDC quantile value Qp (as can be find in the literature) cannot be justified. Correlation analysis made for the pairs (P. , characteristic flow), ( P., catchment area) and (P. , gauging station elevation) revealed some significant correlations. Only for SNQ is not correlated at all; correlation for other characteristic flows is statistically significant for at least one of the cases. The highest correlations (greater than 0.4 in absolute values) were found for the pairs ( P, gauging station elevation) for NSQ and, for SSQ, ( P, SSQ) and ( P, catchment area).

Słowa kluczowe

EN

exceedance probability; low flow; characteristic flow; mountain catchment; flow duration curve; threshold value; annual minimum flow; maximum annual flow; Vistula River

• Wydawca: -
• Czasopismo: Infrastruktura i Ekologia Terenów Wiejskich
• Rocznik: 2014
• Numer: IV/3
• Opis fizyczny: p.1421-1429,fig.,ref.

Twórcy

autor

Weglarczyk S.

• Institute of Water Engineering and Water Management, Krakow University of Technology, Warszawska 24, 31-155 Krakow, Poland

Bibliografia

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Identyfikatory

DOI

10.14597/infraeco.2014.4.3.107