地理漫步·世界地理英语30篇（5）
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Sand Dunes Shift with Wind and Water Balance
沙丘随风与水的平衡而移动
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Wind pushes sand grains uphill and over dune crests.风将沙粒推上坡顶并越过沙丘脊线。
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Moisture in sand slows movement and stabilizes dune shapes.沙中的水分减缓沙粒运动，稳定沙丘形态。
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Dune height and spacing depend on wind strength and direction.沙丘高度和间距取决于风力强弱与风向。
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Vegetation anchors sand and stops dune migration slowly.植被固定沙土，缓慢阻止沙丘移动。
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Coastal dunes protect inland areas from storm surges.海岸沙丘可保护内陆地区免受风暴潮侵袭。
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Desert dunes migrate kilometers over decades under strong winds.在强风作用下，沙漠沙丘数十年间可迁移数公里。
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Satellite images track dune position changes year by year.卫星图像逐年追踪沙丘位置变化。
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Water tables rising near dunes reduce wind-driven mobility.沙丘附近地下水位上升会降低风力驱动的沙丘活动性。