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A global dataset of river network geometry.

Emanuele Giachetta¹, Sean D Willett¹

¹Department of Earth Sciences, ETH Zürich, 8092, Zürich, Switzerland.

Scientific Data

|July 11, 2018

Summary

Global river networks reveal tectonic and climate shifts through a new analysis of channel geometry. This method helps map landscape evolution and identify areas of dynamic change.

Area of Science:

Geomorphology
Hydrology
Tectonics

Background:

River basin plan-form structures hold clues to tectonic, paleogeographic, and paleoclimate conditions.
Interpreting these structures is challenging due to the influence of autogenic fluvial processes.
The characteristic length parameter (χ) offers a method to analyze river network geometry.

Purpose of the Study:

To apply the characteristic length parameter (χ) methodology to global river networks.
To map the geometric structure of continental-scale river systems.
To identify areas where tectonics or climate change have caused river channel disequilibrium.

Main Methods:

Calculating the characteristic length parameter (χ) for global river networks.
Developing a modified parameter (χ') that accounts for precipitation and base-level variations.

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Mapping χ' to visualize global river network geometry.

Main Results:

Global maps of χ' illustrate the geometric structure of river networks worldwide.
The maps highlight regions exhibiting apparent disequilibrium in river channel geometry.
These geometric patterns provide insights into the influence of tectonic and climatic factors.

Conclusions:

The χ' mapping provides a dynamic view of Earth's river networks.
This approach aids in identifying past and ongoing landscape evolution.
The methodology offers a quantitative tool for understanding river system responses to geological and climatic changes.