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Area of Science:

  • Hydrology
  • Geomorphology
  • Environmental Science

Background:

  • Structural hydrological connectivity explains landscape geology and water behavior.
  • Previous research focused on humid/temperate zones, leaving arid/semi-arid responses unclear.
  • Understanding connectivity is crucial for water resource management in regions like the Haihe Basin.

Purpose of the Study:

  • To investigate hydrological responses to structural connectivity at plot/hill slope scales in a semi-arid region.
  • To analyze the relationship between topographical (FL) and soil moisture (ICSL) indices and runoff generation.
  • To assess the potential of soil connectivity to influence water-holding capacity and water yield.

Main Methods:

  • Conducted experiments on four runoff plots in northern China's Haihe Basin during 2012-2013 rainy seasons.
  • Utilized flow path length (FL) based on topography and integral connectivity scale length (ICSL) based on soil moisture.
  • Analyzed correlations between these indices and surface/subsurface runoff responses to rainfall.

Main Results:

  • Surface runoff coefficient showed a strong positive linear correlation with FL.
  • Subsurface flow exhibited a quadratic correlation with ICSLs.
  • Shorter FL plots required more rainfall for surface runoff; lower ICSL indicated greater soil water storage and less subsurface runoff.

Conclusions:

  • Hydrological structure connectivity effectively explains runoff generation mechanisms in semi-arid areas.
  • Improved shallow soil connectivity may increase water-holding capacity, reducing water yields.
  • Further research is needed on FL-runoff thresholds and plant cover impacts.