Including spatial distribution in a data-driven rainfall-runoff model to improve reservoir inflow forecasting in Taiwan

Meng-Jung, T. and Abrahart, R.J. and Mount, Nick J. and Chang, F.-J. (2014) Including spatial distribution in a data-driven rainfall-runoff model to improve reservoir inflow forecasting in Taiwan. Hydrological Processes, 28 (3). pp. 1055-1070. ISSN 1099-1085

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Abstract

Multi-step ahead inflow forecasting has a critical role to play in reservoir operation and management in Taiwan during typhoons as statutory legislation requires a minimum of 3-hours warning to be issued before any reservoir releases are made. However, the complex spatial and temporal heterogeneity of typhoon rainfall, coupled with a remote and mountainous physiographic context makes the development of real-time rainfall-runoff models that can accurately predict reservoir inflow several hours ahead of time challenging. Consequently, there is an urgent, operational requirement for models that can enhance reservoir inflow prediction at forecast horizons of more than 3-hours. In this paper we develop a novel semi-distributed, data-driven, rainfall-runoff model for the Shihmen catchment, north Taiwan. A suite of Adaptive Network-based Fuzzy Inference System solutions is created using various combinations of auto-regressive, spatially-lumped radar and point-based rain gauge predictors. Different levels of spatially-aggregated radar-derived rainfall data are used to generate 4, 8 and 12 sub-catchment input drivers. In general, the semi-distributed radar rainfall models outperform their less complex counterparts in predictions of reservoir inflow at lead-times greater than 3-hours. Performance is found to be optimal when spatial aggregation is restricted to 4 sub-catchments, with up to 30% improvements in the performance over lumped and point-based models being evident at 5-hour lead times. The potential benefits of applying semi-distributed, data-driven models in reservoir inflow modelling specifically, and hydrological modelling more generally, is thus demonstrated.

Item Type: Article
Additional Information: NOTE This is the accepted version of the following article: Tsai, M.-J., Abrahart, R.J., Mount, N.J. and Chang, F.-J. (2014), Including spatial distribution in a data-driven rainfall-runoff model to improve reservoir inflow forecasting in Taiwan. Hydrological Processes, 28(3): 1055–1070. doi: 10.1002/hyp.9559), which has been published in final form at: http://onlinelibrary.wiley.com/doi/10.1002/hyp.9559/abstract
Keywords: semi-distributed model, rainfall-runoff model, data-driven model, reservoir inflow, radar rainfall, ANFIS
Schools/Departments: University of Nottingham UK Campus > Faculty of Social Sciences > School of Geography
Identification Number: https://doi.org/10.1002/hyp.9559
Depositing User: Mount, Dr Nick
Date Deposited: 30 Jan 2015 13:17
Last Modified: 13 Sep 2016 14:58
URI: http://eprints.nottingham.ac.uk/id/eprint/28053

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