Comparing Methods for the Regionalization of Intensity−Duration−Frequency (IDF) Curve Parameters in Sparsely-Gauged and Ungauged Areas of Central Chile
Journal
Hydrology
ISSN
2306-5338
Date Issued
2023
Author(s)
Claudia Sangüesa
Roberto Pizarro
Ben Ingram
Alfredo Ibáñez
Pablo García-Chevesich
Juan Pino
Felipe Pérez
Francisco Balocchi
Francisco Peña
Type
Resource Types::text::journal::journal article
URL Institutional Repository
Abstract
<jats:p>Estimating intensity−duration−frequency (IDF) curves requires local historical information of precipitation intensity. When such information is unavailable, as in areas without rain gauges, it is necessary to consider other methods to estimate curve parameters. In this study, three methods were explored to estimate IDF curves in ungauged areas: Kriging (KG), Inverse Distance Weighting (IDW), and Storm Index (SI). To test the viability of these methods, historical data collected from 31 rain gauges distributed in central Chile, 35° S to 38° S, are used. As a result of the reduced number of rain gauges to evaluate the performance of each method, we used LOOCV (Leaving One Out Cross Validation). The results indicate that KG was limited due to the sparse distribution of rain gauges in central Chile. SI (a linear scaling method) showed the smallest prediction error in all of the ungauged locations, and outperformed both KG and IDW. However, the SI method does not provide estimates of uncertainty, as is possible with KG. The simplicity of SI renders it a viable method for extrapolating IDF curves to locations without data in the central zone of Chile.</jats:p>
Subjects
chile idf curves
;
idf kriging
;
idw idf curves
;
regionalization idf curves