Comparing Methods for the Regionalization of Intensity−Duration−Frequency (IDF) Curve Parameters in Sparsely-Gauged and Ungauged Areas of Central Chile

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 expl...

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Bibliographic Details
Published in:Hydrology 2023-09, Vol.10 (9), p.179
Main Authors: Sangüesa, Claudia, Pizarro, Roberto, Ingram, Ben, Ibáñez, Alfredo, Rivera, Diego, García-Chevesich, Pablo, Pino, Juan, Pérez, Felipe, Balocchi, Francisco, Peña, Francisco
Format: Article
Language:English
Subjects:
Atmospheric precipitations
Basins
Chile IDF curves
Climate change
Floods
Gauges
Geospatial data
History
Hydrology
IDF Kriging
IDW IDF curves
Infrastructure
Methods
Mountains
Parameters
Precipitation
Precipitation (Meteorology)
Rain
Rain gauges
Rainfall intensity
Rainfall intensity duration frequencies
regionalization IDF curves
Scaling
Storms
Stormwater management
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Summary: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.
ISSN:2306-5338
2306-5338
DOI:10.3390/hydrology10090179