Hillier_2019_IDF_online.pdf (1.28 MB)
0/0

Intensity-duration-frequency curves at the global scale

Download (1.28 MB)
journal contribution
posted on 21.08.2019 by Laurent Courty, Robert Wilby, John Hillier, Louise Slater
Intensity-duration-frequency (IDF) curves usefully quantify extreme precipitation over various durations and return periods for engineering design. Unfortunately, sparse, infrequent, or short observations hinder the creation of robust IDF curves in many locations. This paper presents the first global, multi-temporal (1–360 h) dataset of generalized extreme value (GEV) parameters at 31 km resolution dubbed PXR-2 (Parametrized eXtreme Rain). Using these data we generalize site-specific studies to show that that GEV parameters typically scale robustly with event duration (r 2 > 0.88). Thus, we propose a universal IDF formula that allows estimates of rainfall intensity for a continuous range of durations(PXR-4). This parameter scaling property opens the door to estimating sub-daily IDF from daily records. We evaluate this characteristic for selected global cities and a high-density rain gauge network in the United Kingdom. We find that intensities estimated with PXR-4 are within ±20% of PXR-2 for durations ranging between 2 and 360 h. PXR is immediately usable by earth scientists studying global precipitation extremes and a promising proof-of-concept for engineers designing infrastructure in data-scarce regions

Funding

Natural Environment Research Council (NERC) via grant NE/R014361/1

History

School

  • Social Sciences

Department

  • Geography and Environment

Published in

Environmental Research Letters

Volume

14

Publisher

Institute of Physics (IoP)

Version

VoR (Version of Record)

Rights holder

© The authors

Publisher statement

This is an Open Access Article. It is published by IoP under the Creative Commons Attribution 3.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/3.0/

Acceptance date

17/07/2019

Publication date

2019-08-14

Copyright date

2019

ISSN

1748-9326

Language

en

Depositor

Dr John Hillier

Article number

084045

Licence

Exports

Logo branding

Categories

Licence

Exports