Bifurcation Angle Distribution in the Japanese River Network

Bifurcation Angle Distribution in the Japanese River Network

In this study, the distribution of a bifurcation angle in the Japanese river network is investigated. The resultant distribution has a peak at approximately 72° obtained via Gaussian fitting. This characteristic value is consistent with the one obtained in a field observation and theoretically predi...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan Vol. 88; no. 2; p. 24901
Main Authors: Yukawa, Satoshi, Watanabe, Takeru, Hara, Kenji
Format: Journal Article
Language:English
Published: Tokyo The Physical Society of Japan 15-02-2019
Subjects:
Bifurcation theory
Erosion mechanisms
Groundwater
River networks
Seepage
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Summary:In this study, the distribution of a bifurcation angle in the Japanese river network is investigated. The resultant distribution has a peak at approximately 72° obtained via Gaussian fitting. This characteristic value is consistent with the one obtained in a field observation and theoretically predicted in previous studies for the bifurcation caused by groundwater seepage erosion process. In addition, we investigate the distributions of the remaining two angles, called bending angles, at a junction. This distribution has an anomalous peak of approximately 180°. The conditional distribution of the bifurcation angle given the bending angle shows that bifurcation and bending angles have no correlations.
ISSN:0031-9015
1347-4073
DOI:10.7566/JPSJ.88.024901