Identification of sub-trends from hydro-meteorological series

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dc.contributor.authorOnyutha, Charles
dc.date.accessioned2022-09-15T09:13:43Z
dc.date.available2022-09-15T09:13:43Z
dc.date.issued2016
dc.description.abstractIn hydro-meteorological trend analysis, an alteration in the given variable is detected by considering the long-term series as a whole. Whereas the long-term trend may be absent, the significance of hidden (short-durational) sub-trends in the series may be important for environmental management practices. In this paper, a graphical approach of identifying trend or sub-trends using nonparametric cumulative rank difference (CRD) was proposed. To confirm the significance of the visualized trend, the CRD was translated from the graphical to a statistical metric. To assess its capability, the performance of the CRD method was compared with that of the well-known Mann–Kendall (MK) test. The graphical and statistical CRD techniques were applied to detect trends and subtrends in the annual rainfall of 10 River Nile riparian countries (RNRCs). The co-occurrence of the trend evolutions in the rainfall with those of the large-scale ocean– atmosphere interactions was analyzed. The power of the CRD method was shown to closely agree with that of the MK test under the various circumstances of sample sizes, variations, linear trend slopes, and serial correlations. At the level of significance a = 5 %, the long-term trends were found present in 30 % of the RNRCs. However at a = 5 %, the main downward (upward) sub-trends were found significant in 30 (60 %) of the RNRCs. Generally at a = 1 %, linkages of the trend evolutions in the rainfall of the RNRCs were found to those of the influences from the Atlantic and Indian Oceans. At a = 5 %, influences from the Pacific Ocean on the rainfall trends of some countries were also evident.en_US
dc.identifier.citationOnyutha, C. (2016). Identification of sub-trends from hydro-meteorological series. Stochastic environmental research and risk assessment, 30(1), 189-205. DOI 10.1007/s00477-015-1070-0en_US
dc.identifier.other10.1007/s00477-015-1070-0
dc.identifier.urihttps://nru.uncst.go.ug/handle/123456789/4766
dc.language.isoenen_US
dc.publisherStochastic environmental research and risk assessmenten_US
dc.subjectTrend analysisen_US
dc.subjectTrend evolutionen_US
dc.subjectSub-trend identificationen_US
dc.subjectNonparametric cumulative rank deviation (CRD) methoden_US
dc.subjectHydro-meteorologyen_US
dc.subjectRiver Nile riparian countriesen_US
dc.titleIdentification of sub-trends from hydro-meteorological seriesen_US
dc.typeArticleen_US
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