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Explaining evapotranspiration dynamics via CNN-LSTM and temporal SHAP: a multi-step forecasting approach across diverse climates | ||
| Journal of Applied Research in Water and Wastewater | ||
| دوره 13، شماره 1 - شماره پیاپی 25، شهریور 2026، صفحه 41-49 اصل مقاله (1.54 M) | ||
| نوع مقاله: Research Paper | ||
| شناسه دیجیتال (DOI): 10.22126/arww.2026.13312.1456 | ||
| نویسندگان | ||
| Moein Tosan* 1؛ Afshin Shayeghi2؛ Javad Teymouri3؛ Aydin Bakhtar3 | ||
| 1Department of Irrigation and Reclamation Engineering, University of Tehran, Karaj, Iran. | ||
| 2Department of Geography & Environmental Sustainability, University of Oklahoma, Norman, Oklahoma, USA.A | ||
| 3Department of Civil Engineering, University of Texas at Arlington, Arlington, Texas, USA. | ||
| چکیده | ||
| Reliable multi-step-ahead forecasting of reference evapotranspiration (ETo) is critical for proactive water resource management, yet understanding the temporal memory of hydrological systems remains a challenge for black-box deep learning models. This study presents a novel, interpretable forecasting framework integrating temporal SHapley additive explanations (SHAP) with advanced recurrent neural networks to predict daily ETo up to 7 days in advance across three contrasting climatic zones in Iran; Birjand (arid), Mashhad (semi-arid), and Gorgan (humid). By benchmarking long short-term memory (LSTM), bidirectional LSTM (BiLSTM), and CNN-LSTM architectures, it is demonstrated that model complexity does not always guarantee superiority; the standard LSTM proved remarkably robust, achieving high short-term accuracy (R² > 0.93 for 1-day forecast) in arid regions. However, a distinct humid-climate penalty was observed, with forecast accuracy degrading more rapidly in Gorgan due to stochastic cloud dynamics. The application of temporal SHAP revealed climate-specific memory effects: in arid zones, wind speed exhibited a persistent influence extending back 5 days, acting as a long-term driver of evaporative demand, whereas humid regions were governed by short-term radiative pulses. Furthermore, analysis of extreme events and drought propagation showed that while the model successfully captures heatwave-driven peaks, its reliability decreases under severe evaporative stress (standardized ETo anomaly > 2). Cross-spatial generalization tests confirmed that models trained on arid data transfer effectively to humid regions (R² = 0.95), but the reverse transfer fails to capture extreme advective forcing. This study provides a transferable, physically interpretable blueprint for developing early warning systems in data-scarce regions. | ||
| کلیدواژهها | ||
| Climatic memory؛ Explainable artificial intelligence؛ Multi-step forecasting؛ SHAP | ||
| مراجع | ||
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