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Article

Component Combination Test to Investigate Improvement of the IHACRES and GR4J Rainfall–Runoff Models

by 1 and 2,*
1
Water Resources Research Team, Jeju Province Development Corporation, 1717-35, Namjo-ro, Jocheon-eup, Jeju-si 63345, Jeju-do, Korea
2
Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology, 283, Goyangdae-ro, Ilsanseo-gu, Goyang-si 10223, Gyeonggi-do, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Mojca Šraj
Water 2021, 13(15), 2126; https://doi.org/10.3390/w13152126
Received: 25 June 2021 / Revised: 30 July 2021 / Accepted: 30 July 2021 / Published: 2 August 2021
(This article belongs to the Special Issue Modelling Hydrologic Response of Non­-homogeneous Catchments)
Rainfall–runoff models are not perfect, and the suitability of a model structure depends on catchment characteristics and data. It is important to investigate the pros and cons of a rainfall–runoff model to improve both its high- and low-flow simulation. The production and routing components of the GR4J and IHACRES models were combined to create two new models. Specifically, the GR_IH model is the combination of the production store of the GR4J model and the routing store of the IHACRES model (vice versa in the IH_GR model). The performances of the new models were compared to those of the GR4J and IHACRES models to determine components improving the performance of the two original models. The suitability of the parameters was investigated with sensitivity analysis using 40 years’ worth of spatiotemporally different data for five catchments in Australia. These five catchments consist of two wet catchments, one intermediate catchment, and two dry catchments. As a result, the effective rainfall production and routing components of the IHACRES model were most suitable for high-flow simulation of wet catchments, and the routing component improved the low-flow simulation of intermediate and one dry catchments. Both effective rainfall production and routing components of the GR4J model were suitable for low-flow simulation of one dry catchment. The routing component of the GR4J model improved the low- and high-flow simulation of wet and dry catchments, respectively, and the effective rainfall production component improved both the high- and low-flow simulations of the intermediate catchment relative to the IHACRES model. This study provides useful information for the improvement of the two models. View Full-Text
Keywords: combination of model components; rainfall–runoff model; sensitivity analysis; model improvement combination of model components; rainfall–runoff model; sensitivity analysis; model improvement
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MDPI and ACS Style

Shin, M.-J.; Kim, C.-S. Component Combination Test to Investigate Improvement of the IHACRES and GR4J Rainfall–Runoff Models. Water 2021, 13, 2126. https://doi.org/10.3390/w13152126

AMA Style

Shin M-J, Kim C-S. Component Combination Test to Investigate Improvement of the IHACRES and GR4J Rainfall–Runoff Models. Water. 2021; 13(15):2126. https://doi.org/10.3390/w13152126

Chicago/Turabian Style

Shin, Mun-Ju, and Chung-Soo Kim. 2021. "Component Combination Test to Investigate Improvement of the IHACRES and GR4J Rainfall–Runoff Models" Water 13, no. 15: 2126. https://doi.org/10.3390/w13152126

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