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- W2015365764 abstract "Regional frequency analysis based on the method of L-moments is performed from annual maximum series of extreme precipitation intensity to update Intensity–Duration-Frequency (IDF) curves for the city of Trondheim. The main problems addressed are (1) reduction of uncertainties of different sources for reliable estimation of quantiles: (i) testing of trend patterns and stationarity of the data series from the target site and demonstrating the dependency of results on the data used; (ii) testing regional homogeneity of extreme precipitation events for the climate regime in the study area and “pooling” of regional data for data augmentation and reduction of uncertainty due to short length of data series; and (iii) selection of distributions for extreme precipitation events of different durations to reduce the uncertainty due to choice of distributions; and (2) assessment and quantification of sampling uncertainty in terms of interval estimates (confidence bounds) of quantiles. Trend patterns and check for stationarity were demonstrated for a data from a target site based on both non-parametric Mann–Kendall and parametric regression tests. Selection of distributions was performed based on Z-statistics and L-moment ratio diagrams. Non-parametric balanced bootstrap resampling was used to quantify the sampling uncertainty. For extreme precipitation events of shorter durations (5–30 min) there are statistically significant increasing trend patterns for the data series with start years of 1992–1998 while there are no significant trend patterns for recent extremes and there are no statistically significant trend patterns for longer durations (45–180 min). The results of the analyses indicate that: (1) significance tests for trend patterns and stationarity are dependent on the data series used but the stationarity assumption is valid for the data series used from the target site. (2) the extreme precipitation events from four sites in Trondheim are homogeneous and can be “pooled” for regional analysis; (3) different types of distributions fit to extreme precipitation events of different durations which shows that thorough selection of distributions is indispensable rather than fitting a single distribution for the whole durations; (4) interval estimates from balanced bootstrap resampling indicated that there is huge sampling uncertainty in quantile estimation that needs to be addressed in any frequency analysis; and (5) large differences are observed between the IDF curves from this study and the existing IDF curves (i.e. Imetno). The IDF curves from this study are from data augmented through regional analysis, based on thorough procedures for selection of distributions and also include uncertainty bounds and hence are more reliable than the existing one. Hence, the methods and procedures followed in this study are expected to contribute to endeavors for estimating reliable IDF curves." @default.
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- W2015365764 date "2013-08-01" @default.
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- W2015365764 title "Regional frequency analysis of extreme precipitation with consideration of uncertainties to update IDF curves for the city of Trondheim" @default.
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- W2015365764 doi "https://doi.org/10.1016/j.jhydrol.2013.06.019" @default.
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