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Runoff forecast and analysis of the probability of dry and wet transition in the Hanjiang River Basin

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Abstract

Runoff prediction plays an important guiding role in water resources planning and management, flood and drought prevention. As the Hanjiang River Basin (HRB) is the water source of the middle line of the South-to-North Water Diversion Project, it has higher requirements for water resources accurate prediction. In order to analyze the prediction capabilities of different prediction methods for the HRB runoff, this study constructed 12 prediction models to simulate and predict the runoff of four hydrological stations in the HRB. Furthermore, the Markov Chain Monte Carlo (MCMC) method was used to analyze the transition probability of runoff from low-to-high (high-to-low). The results showed that the runoff of four hydrological stations in the HRB all showed a downward trend, and most of the sudden changes occurred in the 1980 s. The smoother the runoff changes, the easier it is to make accurate prediction. Among the 12 models, the quadric spline Markov forecasting model (QS-MFM), moving average Markov forecasting model (MA-MFM), Markov forecasting model (MFM), deep neural networks (DNN), and cubic exponential smoothing (CES) methods have stronger generalization ability and can more accurately predict the runoff of the HRB. The average relative error during the validation period is 0.27, 0.28, 0.33, 0.34 and 0.39, respectively. The logistic model can accurately simulate the change of runoff status in the HRB. The wet threshold of Baihe (BH), Huanglongtan (HLT), Huangjiagang (HJG), and Huangzhuang (HZ) is 819.9 m3/s, 207.4 m3/s, 1313.9 m3/s and 1681.7 m3/s, and the dry threshold is 480.4 m3/s, 130.6. m3/s, 817.8 m3/s and 1083.4 m3/s, respectively. The MCMC method can accurately estimate the parameters of the logistic model, and the low-high (high-low) runoff transition probability model constructed in the HRB can accurately calculate the low to high (high to low) runoff transition probability.

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Acknowledgements

The research is financially supported by National Natural Science Foundation of China (Grant Nos. U1911204, 51861125203), National Key R&D Program of China (2017YFC0405900), The Project for Creative Research from Guangdong Water Resources Department (Grant Nos. 2018, 2020).

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Correspondence to Xiaohong Chen.

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Jin, H., Chen, X. & Zhong, R. Runoff forecast and analysis of the probability of dry and wet transition in the Hanjiang River Basin. Stoch Environ Res Risk Assess 36, 1485–1502 (2022). https://doi.org/10.1007/s00477-021-02096-9

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  • DOI: https://doi.org/10.1007/s00477-021-02096-9

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