Width partitioning and scaling in braided river cross sections: beyond channel count
摘要
Braided rivers are commonly described through cross-sectional descriptors based on the number of active wet channels. Although such descriptors capture important aspects of channel multiplicity, they provide only a partial representation of the underlying structure, as they do not fully account for how the total wetted width is distributed among the active branches. Previous studies have introduced entropy-based indices and multifractal approaches to incorporate width-related information and to characterize the complexity of braided systems. In this work we revisit the problem of cross-sectional description by focusing on the internal organization of braided river sections, combining the number of active channels with the distribution of their widths. Using two independent high-resolution cross-sectional datasets of the Brahmaputra-Jamuna River (Bangladesh) acquired in 2007 and 2005, we analyze how width partitioning varies across sections and how it relates to traditional channel-count descriptors. The results indicate that sections characterized by the same number of active channels may exhibit significantly different internal configurations, suggesting that channel count alone is not sufficient to fully describe braided morphology. The proposed analysis provides a complementary statistical and structural perspective to existing entropy-based and multifractal descriptors, contributing to a more detailed understanding of the internal organization of braided river sections.