Peaks-over-threshold model in flood frequency analysis: a scoping review

Abstract In flood frequency analysis (FFA), annual maximum (AM) model is widely adopted in practice due to its straightforward sampling process. However, AM has been criticized for limited flexibility. FFA using peaks-over-threshold (POT) an alternative model, which offers several theoretical advantages; however, this currently underemployed internationally. This study aims bridge the current knowledge gap by conducting a scoping review covering aspects of POT approach including assumptions, independence criteria, threshold selection, parameter estimation, probability distribution, regionalization and stationarity. We have reviewed previously published articles on investigate: (a) possible reasons underemployment FFA; (b) challenges applying model. It highlighted that greater flexibility compared nature process associated with The more capable providing less biased estimates frequent floods. mainly complexity selecting (e.g., physical satisfy criteria statistical Generalized Pareto distribution – most commonly applied modelling). also found uncertainty individual variable combined effects variables are not well assessed previous research, there lack established guideline apply FFA.