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Hydrological Connectivity Patterns and Their Eco-hydrological Implications in the Dasha River, China
Summary
This study used graph theory and isotope tracing with weekly eco-hydrological monitoring to assess hydrological connectivity and ecological impacts in the heavily modified Dasha River, Shenzhen, providing a methodological framework for urban river management.
This study establishes a methodological paradigm for urban river connectivity assessment and provides actionable insights for designing ecologically informed river management strategies in anthropogenically modified watersheds.It also evaluates hydrological connectivity and ecological impacts in urban rivers modified by anthropogenic activities, using the Dasha River in Shenzhen city, southeastern China as a case study.An integrated framework combining graph theory and isotope tracing, supported by weekly eco-hydrological monitoring, revealed spatiotemporal connectivity patterns and ecological responses.The key findings were the followings: (1) Spatial heterogeneity dominated connectivity, with upper-midstream segments (index = 0.88-1.42)exceeding downstream reaches (0.11-0.12), driven by natural hydrology and human modifications.(2) Seasonal connectivity peaked in summer-autumn-winter, but winter artificial water replenishment induced isotopic decoupling, creating a vulnerable "high-connectivity, low-correlation" pseudo-state.(3) Connectivity strongly correlated with runoff regulation (+), minimally influenced soil moisture, enhanced water self-purification, and stabilized water quality.Riparian vegetation responses were distance-dependent: connectivity correlations weakened with lateral distance from the channel.This work establishes a methodological paradigm for urban river connectivity assessment and informs ecologically adaptive management strategies in watersheds affected by anthropogenic activities.
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