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DOI: https://doi.org/10.11988/ckyyb.20250066

Evolution Characteristics of Hydrological Regimes in Rivers of Southwest China —— Taking Baoshan City as an Example

  • ZHANG Ning , 1 ,
  • LI Cheng-liang , 1 ,
  • CHEN Wen-hua 2 ,
  • ZHAO Wei-hua 3 ,
  • GU Cong-xiao 1
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  • 1. Baoshan Branch of Yunnan Province Hydrology and Water Resources Bureau，Baoshan 678000,China
  • 2. Baoshan University School of Resources and Environment,Baoshan 678000,China
  • 3. Changjiang River Scientific Research Institute, Wuhan 430010,China

Received date: 2025-01-24

  Revised date: 2025-04-09

  Online published: 2025-06-03

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Abstract

The hydrological evolution of transboundary rivers in the Dianxi Plateau was investigated to support regional water resource management. Precipitation and runoff data (1956-2016) from three major river systems (Lancang, Nujiang, and Irrawaddy) in Southwest China were analyzed using Mann-Kendall trend tests and Morlet wavelet analysis. Key findings include: ①A high water yield modulus (78.83 × 10⁴ m³/km²) was observed, though a declining trend was identified, with the Irrawaddy Basin showing the most significant reduction rate (−0.175 × 10⁸ m³/yr), 7.3 times greater than that of the Lancang River (−0.024 × 10⁸ m³/yr). ②A dominant 24-year hydrological cycle was detected, with 2016 marking the end of its low-frequency phase, suggesting potential future water scarcity based on phase extrapolation. ③The Lancang River was found to exhibit unique 7-12-year sub-cycles, differing from the single-cycle patterns of the Nujiang and Irrawaddy systems. ④Strong precipitation-runoff correlations (R² > 0.75) were confirmed, though asynchronous behavior was noted in the Lancang River due to distinct underlying surface conditions.Spatial heterogeneity in hydrological evolution across the three river basins was systematically quantified, and a multi-scale cyclical analysis framework for water resource prediction was established. These results provide new scientific support for transboundary river management in Southwest China, emphasizing the need for basin-specific adaptation strategies given observed differential hydrological responses.

Key words： Precipitation; Total water resources; Hydrological regime; Morlet wavelet analysis; SWRB

Cite this article

ZHANG Ning , LI Cheng-liang , CHEN Wen-hua , ZHAO Wei-hua , GU Cong-xiao . Evolution Characteristics of Hydrological Regimes in Rivers of Southwest China —— Taking Baoshan City as an Example[J]. Journal of Changjiang River Scientific Research Institute, 2025 . DOI: 10.11988/ckyyb.20250066

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