科学素养与生活应用·英语30篇（4）

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沙漠沙丘为何呈平行脊状排列：风力与颗粒动力学

Desert dunes often form long, parallel ridges aligned with the dominant wind direction.
This pattern emerges because steady winds sort sand grains by size and transport them consistently.
Larger grains roll along the surface while finer particles bounce or float briefly in air.
As wind slows over obstacles, sand deposits build up gradually into elongated ridges.
The spacing between ridges depends on wind speed, grain density, and surface roughness.
Satellite imaging reveals these patterns shift only millimeters per year under stable conditions.
Geologists use laser scanning to measure dune height changes during seasonal wind shifts.
Computer models simulate airflow turbulence to predict how new ridges form over decades.
Such alignment helps engineers design solar farms that minimize sand accumulation on panels.
Studying dune geometry also informs Mars rover navigation through extraterrestrial aeolian landscapes.