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

Rainfall–runoff models are not perfect, and the suitability of a model structure depends on catchment characteristics data. It is important to investigate pros cons rainfall–runoff improve both its high- low-flow simulation. The production routing components GR4J IHACRES were combined create two new models. Specifically, GR_IH combination store (vice versa in IH_GR model). performances compared those determine improving performance original parameters was investigated with sensitivity analysis using 40 years’ worth spatiotemporally different data for five catchments Australia. These consist wet catchments, one intermediate catchment, dry catchments. As result, effective rainfall most suitable high-flow simulation component improved Both catchment. low- respectively, simulations relative model. This study provides useful information improvement