A simplified storm index method to extrapolate intensity-duration-frequency (IDF) curves for ungauged stations in central Chile

Roberto Pizarro, Rodrigo Valdés, Alejandro Abarza, Pablo Garcia-Chevesich

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Most of meteorological stations in Chile register rainfall amounts once every 24h. The creation of intensity-duration-frequency (IDF) curves requires continuous recorded data, and this insufficiency of proper instrumentation has resulted in a lack of IDF curves nationwide. The objective of this study is to further develop and evaluate the feasibility of a new method to estimate IDF curves in ungauged stations under Mediterranean climates of central Chile. A technique used to address this problem is the use of a storm index (SI), also known as the 'K' method, which allows the construction of IDF curves from stations with discontinuous data, by extrapolating data from stations with continuous records, as long as daily rainfall intensities for both stations differ by less than 2mmh-1. To test the applicability of this method, SI values were calculated for 40 meteorological stations located throughout Central Chile (latitudes 30°S to 40°S). The extrapolated IDF curves were then compared with observed data, and the goodness of fit was determined. The results indicate that the storm index method can adequately estimate hourly IDF curve values for stations lacking of continuous rainfall data.

Original languageEnglish
Pages (from-to)641-652
Number of pages12
JournalHydrological Processes
Volume29
Issue number5
DOIs
StatePublished - 28 Feb 2015
Externally publishedYes

Keywords

  • Frequency-duration-intensity curves
  • IDF curves
  • K method
  • Rainfall intensity
  • Storm index method

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