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Retention-driven water flow regulation: A network perspective.

Xuan Jiang1, Jinsong Zhao1, Zhiwen Cai1

  • 1State Environmental Protection Key Laboratory of Soil Health and Green Remediation, Huazhong Agricultural University, Wuhan, 430070, China.

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This study introduces a network framework to understand water retention, revealing how different pathways enhance flow stability and dry-season water security. The research highlights the importance of connectivity maintenance pathways for water accessibility and system resilience.

Keywords:
Ecological network analysisSystem resilienceTime-spanning networkWater flow regulationWater retention

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Area of Science:

  • Hydrology
  • Ecosystem Services
  • Network Analysis

Background:

  • Water retention is crucial for managing hydrological variability but its structural role in regulatory stability is unclear.
  • Existing methods lack a framework to analyze the time-specific contributions of retention processes.

Purpose of the Study:

  • To develop and apply a network-based framework to conceptualize and quantify water retention processes.
  • To distinguish time-structured pathways of water release and their contributions to regulatory functions.
  • To assess the impact of ecosystem retention on hydrological variability and water security.

Main Methods:

  • Integrated Input-Output Analysis (IOA) with Ecological Network Analysis (ENA).
  • Developed a time-spanning flow network model.
  • Applied the framework to the Gongshui Watershed (1990-2019).

Main Results:

  • Ecosystem retention significantly reduced hydrological variability, lowering coefficients of variation for evapotranspiration and water supply.
  • Dry-season water security improved, indicated by a lower socioeconomic water accessibility index.
  • Contemporaneous supply pathways contributed ~30% to annual water supply, while connectivity maintenance pathways enhanced dry-month accessibility by up to 53.7% and supported ~20% of system resilience.

Conclusions:

  • The network framework effectively quantifies the structural functions of water retention.
  • Connectivity maintenance pathways are vital for water accessibility and resilience, despite potential efficiency trade-offs.
  • The framework provides a scalable tool for adaptive water management under climate uncertainty.