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Gewählte Publikation:

Laaha G., Blöschl, G..
(2007): A national low flow estimation procedure for Austria
HYDROLOG SCI J, 52(4), 625-644; ISSN 0262-6667 FullText FullText_BOKU

We present a procedure for estimating Q95 low flows in both gauged and ungauged catchments where Q95 is the flow that is exceeded 95% of the time. For each step of the estimation procedure, a number of alternative methods was tested on the Austrian data set by leave-one-out cross-validation, and the method that performed best was used in the final procedure. To maximise the accuracy of the estimates, we combined relevant sources of information including long stream-flow records, short streamflow records, and catchment characteristics, according to data availability. Rather than deriving a single low flow estimate for each catchment, we estimated lower and upper confidence limits to allow local information to be incorporated in a practical application of the procedure. The components of the procedure consist of temporal (climate) adjustments for short records; grouping catchments into eight seasonality-based regions; regional regressions of low flows with catchment characteristics; spatial adjustments for exploiting local streamflow data; and uncertainty assessment. The results are maps of lower and upper confidence limits of low flow discharges for 21 000 sub-catchments in Austria.
Autor*innen der BOKU Wien:
Laaha Gregor

Find related publications in this database (Keywords)
low flows
prediction of ungauged catchments (PUB)
seasonality index
catchment grouping
regional regression
climate variability adjustment
predictive uncertainty

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