In 1990, Swiss scientists performed dye tracer experiments in Lake Alpnach, revealing that dye clouds formed elongated streaks rather than symmetrical circles. This finding challenged Batchelor’s turbulence theory regarding horizontal diffusion. A shear-diffusion model, however, accurately captured the observed cloud behavior. Subsequent research further validated the impact of shear on both dispersion and cloud orientation, reshaping our understanding of fluid dynamics in lakes.
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