Articles | Volume 12, issue 6
https://doi.org/10.5194/esurf-12-1347-2024
https://doi.org/10.5194/esurf-12-1347-2024
Research article
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05 Dec 2024
Research article | Highlight paper |  | 05 Dec 2024

Channel concavity controls planform complexity of branching drainage networks

Liran Goren and Eitan Shelef

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Cited articles

Abed-Elmdoust, A., Miri, M.-A., and Singh, A.: Reorganization of river networks under changing spatiotemporal precipitation patterns: An optimal channel network approach, Water Resour. Res., 52, 8845–8860, https://doi.org/10.1002/2015WR018391, 2016. a, b
Badgley, C., Smiley, T. M., Terry, R., Davis, E. B., DeSantis, L. R., Fox, D. L., Hopkins, S. S., Jezkova, T., Matocq, M. D., Matzke, N., McGuire, J. L., Mulch, A., Riddle, B. R., Roth, V. L., Samuels, J. X., Strömberg, C. A., and Yanites, B. J.: Biodiversity and Topographic Complexity: Modern and Geohistorical Perspectives, Trends Ecol. Evol., 32, 211–226, https://doi.org/10.1016/j.tree.2016.12.010, 2017. a
Banavar, J. R., Colaiori, F., Flammini, A., Maritan, A., and Rinaldo, A.: Scaling, Optimality, and Landscape Evolution, J. Stat. Phys., 104, 1–48, https://doi.org/10.1023/A:1010397325029, 2001. a, b, c
Beeson, H. W., McCoy, S. W., and Keen-Zebert, A.: Geometric disequilibrium of river basins produces long-lived transient landscapes, Earth Planet. Sc. Lett., 475, 34–43, https://doi.org/10.1016/j.epsl.2017.07.010, 2017. a
Beeson, H. W., Willett, S., Pellissier, L., and Wang, Y.: Identifying causal links between tectonic processes and biodiversity in an orogenic wedge setting with a coupled landscape-biodiversity evolution model, in: AGU Fall Meeting 2021, New Orleans, LA, 13–17 December 2021, id. B53C-06, 2021. a
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Editorial statement
This paper presents a new way of quantifying geometries of drainage networks, moving beyond river long profiles to explore the complexity of planform branching river networks. Using the proposed length asymmetry metric, the paper demonstrates that complexity is correlated with landscape aridity, where arid landscapes have less complex networks compared to humid ones, suggesting this metric could be a new way of exploring the impact of climate on Earth's topography.
Short summary
To explore the pattern formed by rivers as they crisscross the land, we developed a way to measure how these patterns vary, from straight to complex, winding paths. We discovered that a river's degree of complexity depends on how the river slope changes downstream. Although this is strange (i.e., why would changes in slope affect twists of a river in map view?), we show that this dependency is almost inevitable and that the complexity could signify how arid the climate is or used to be.
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