Abstract
L-moment procedures are applied to develop regional rainfall annual maxima (maximum 24-h rainfall occurring annually), considering complex physiographic and hydroclimatological features and weather processes as attributes influencing regional homogeneity. Capability of L-moment procedures in breaking down large areas into coherent and homogeneous sub-regions is investigated. The study area of 238,630 km2 is located in southwestern Iran, representing 154 rainfall recording gauges of rather complex orographic features. According to the results and considering the extreme value nature of the analysis, i.e., rainfall annual maxima, it was possible to establish four homogeneous sub-regions, representing areas of 80,490 km2, 75,880 km2, 31,810 km2 and 50,450 km2. The L-moment procedures successfully evaluated the homogeneity analyses and assignment of appropriate regional probability distribution functions (PDFs) to individual sub-regions. Flood potential maps and associated rainfall depth-area information were provided for individual sub-regions. The proposed heterogeneity measures by Hosking and Wallis (Water Resour Res 29(2):271–289, 1993), known as H1, H2 and H3 tests were further investigated in this research. The results of this research confirmed findings of Hosking and Wallis (Water Resour Res 29(2):271–289, 1993), i.e., strong capability of H1 as a heterogeneity measure, and lack of capability of H2 and H3 measures for distinguishing between homogenous and heterogeneous regions.
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Abolverdi, J., Khalili, D. Development of Regional Rainfall Annual Maxima for Southwestern Iran by L-Moments. Water Resour Manage 24, 2501–2526 (2010). https://doi.org/10.1007/s11269-009-9565-4
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DOI: https://doi.org/10.1007/s11269-009-9565-4