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We analyze the microscopic dynamics of vortex motion through channels thatform river-like fractal networks in a variety of superconducting samples, andrelate it to macroscopic measurable quantities such as the power spectrum. As afunction of pinning strength, we calculate the fractal dimension, tortuosity,and the corresponding voltage noise spectrum. Above a certain pinning strength,a remarkable universal drop in both tortuosity and noise power occurs when thevortex motion changes from shifting braiding channels to unbraided channels. Wecompare our results with experiments.Comment: 4 pages, 3 figures. Accepted to Phys. Rev. Let

Fractal Networks, Braiding Channels, and Voltage Noise in Intermittently Flowing Rivers of Quantized Magnetic Flux