Using spatially explicit indicators to investigate watershed characteristics and stream temperature relationships

Area of Science:

• Environmental Science
• Hydrology
• Geomorphology

Background:

• Rapid urbanization alters watershed characteristics, influencing stream thermal regimes.
• Understanding the relationship between land cover and stream temperature is crucial for water resource management.
• Existing methods may not fully capture the complex interactions within drainage basins.

Purpose of the Study:

• To develop novel, spatially explicit indicators of watershed permeability and runoff.
• To examine the relationship between land cover and stream water temperature in urbanizing watersheds.
• To assess the thermal sensitivity of streams based on geomorphological and surface characteristics.

Main Methods:

• Generated four model groups with different landscape characteristic weighting schemes.
• Evaluated 19 variables, including land cover, elevation, slope, and flow accumulation.
• Assessed predictive capacity on five stream thermal properties, including thermal 'flashiness'.

Main Results:

• Spatially explicit landscape indicators combining watershed processes enhanced regression performance.
• Improved prediction accuracy for ecologically relevant stream temperature variables was observed.
• The framework demonstrated adaptability for examining thermal sensitivity in diverse watersheds.

Conclusions:

• Novel indicators improve the prediction of stream thermal variables in urbanizing watersheds.
• Spatially explicit data provide a more hydrologically meaningful understanding of landscape change impacts.
• The adaptable framework aids in rapid investigation of stream thermal conditions and landscape characteristics.