A proposal for bidirectional long-short-term memory rainfall-runoff predictive modeling (BiLSTM-RPM) with a sliding window generator (SWG) technique for an urban watershed
Cabila Subramaniyam, Yoshiyuki Imamura, Hideo Amaguchi
Received 1 February, 2024
Accepted 14 April, 2025
Published online 21 June, 2025
Cabila Subramaniyam1), Yoshiyuki Imamura1), Hideo Amaguchi1)
1) Department of Civil Engineering, Tokyo Metropolitan University, Japan
Neural networks (NNs) have recently gained attention for establishing Rainfall-runoff Predictive Models (RPMs) to receive accurate upcoming hydrographs. This study established Bidirectional Long-Short-Term Memory Model-based RPMs (BiLSTM-RPMs) for a small-to-medium-scale urban watershed, the Upper Kanda basin, occupying nearly 11 km2. The average rainfall of six stations and streamflow of a water level gauge were considered to gather a hundred events with minute-to-minute intervals for 12 years from 1999. The influence of batch-wise shuffling was investigated by developing BiLSTM-RPMs with a sliding window generator (SWG) technique for target lengths (TLs) such as 10 minutes (TL10), TL20, TL30, and TL60. Batch-wise shuffling was supported to predict seamless hydrographs, where all TLs achieved Nash–Sutcliffe model efficiency (NSE) above 0.8, Root Mean Square Error (RMSE) below 0.01 mm/min, and coefficient of determination (R2) for peak alignment above 0.95. Long-Short-Term Memory Model-based RPMs (LSTM-RPMs) derived appreciable forecasted hydrographs for TL10 and TL20; however, they performed poorly for TL30 and TL60, where the R2 was 0.88 and 0.62, respectively.
Copyright (c) 2025 The Author(s) CC-BY 4.0