Climate's influence on topography encoded in stream network topology and geometry

Area of Science:

• Geomorphology
• Hydrology
• Network Science

Background:

• Stream network morphology is described by topology and geometry.
• The co-evolution of topology and geometry is poorly understood.
• Climate and topography shape stream networks.

Purpose of the Study:

• Analyze the topology and geometry of real-world stream networks.
• Investigate how climate and topography influence network structure.
• Understand the interplay between network topology, geometry, and landscape evolution.

Main Methods:

• Analyzed 16,322 5th-order stream networks across the contiguous United States.
• Examined topological connectivity and branching geometry.
• Correlated network properties with climate and topographic data.

Main Results:

• ~73% of networks exhibit topological self-similarity.
• Tributaries join larger streams at systematically wider angles.
• Climate-network topology correlations are mediated by geometric and topographic properties.

Conclusions:

• Network geometry, topography, and topology co-evolve.
• Landscape evolution, driven by climate, shapes stream networks.
• Findings integrate network science with geomorphology and hydrology.