Abstract
Accurate flood runoff and water level predictions are crucial research topics due to their significance for early warning systems, particularly in improving peak flood level forecasts and reducing time lags. This study proposes a novel method, Trend Forecasting Method (TFM), to improve model accuracy and overcome the time lag problem due to data scarcity. The proposed method includes the following steps: (1) select appropriate input factors causing flood events, (2) determine the most suitable AI method as the basis for forecasting models, (3) a forecasting model using a multi-step-ahead approach and a forecasting model with variation in flood depth as input are developed as compared to the selected model in Step 2, and (4) according to the rising limb and falling limb of a flood hydrograph, the maximum and minimum values predicted by the models above are respectively selected as the final outputs. The application to demonstrate the advantages of the proposed method was conducted in the Annan District of Tainan City, Taiwan. Of all the models tested, the Gated Recurrent Unit (GRU) demonstrated superior accuracy in forecasting flood depths, followed by Long Short-Term Memory (LSTM) and Bidirectional LSTM, with the Back Propagation Neural Network falling behind. With a Nash–Sutcliffe efficiency coefficient (NSE) of 0.56 for the next hour’s forecast, the GRU model’s structure appears particularly fitting for flood depth forecast. However, all four models showed time lag issues. TFM substantially enhanced the GRU model’s forecast accuracy, mitigating the time lag. TFM achieved an NSE of 0.82 for forecasting 10-, 20-, 30-, 40-, 50-, and 60-min lead time. The observed flood depths had a 68% probability of consistent rise or fall, validating TFM’s underlying hypothesis. Furthermore, including an autoregressive model in TFM reduced the time lag problem.
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Acknowledgements
We acknowledge the National Science and Technology Council of Taiwan (Grant numbers: MOST 109-2625-M-035-007-MY3 and NSTC 112-2625-M-011-001 -) for granting support. The authors thank the Water Resources Planning Branch, Water Resources Agency, Ministry of Economic Affairs for providing relevant data and Mr. George Chih-Yu Chen for his assistance in the English editing. The authors also thank Tsung-Tang Tsai for his invaluable work developing AI models. During the preparation of this work the authors used GPT-4 in order to English editing.
Funding
This research project is funded by the National Science and Technology Council, Taiwan (grant numbers: MOST 109–2625-M-035–007-MY3 and NSTC 112–2625-M-011–001 -).
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Song-Yue Yang: Conceptualization, Methodology, Visualization, Writing – original draft, Funding acquisition; You-Da Jhong: Writing – review & editing; Bing-Chen Jhong: Conceptualization, Supervision, Writing – review & editing; Yun-Yang Lin: Data curation, Software.
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Yang, SY., Jhong, YD., Jhong, BC. et al. Enhancing Flooding Depth Forecasting Accuracy in an Urban Area Using a Novel Trend Forecasting Method. Water Resour Manage 38, 1359–1380 (2024). https://doi.org/10.1007/s11269-023-03725-4
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DOI: https://doi.org/10.1007/s11269-023-03725-4