地理漫步·世界地理英语30篇（1）
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Victoria Falls Erosion and the Zambezi’s Retreat Rate
维多利亚瀑布侵蚀与赞比西河后退速率
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Victoria Falls lies on the Zambezi River between Zambia and Zimbabwe, where basalt cliffs drop 108 meters.
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The waterfall erodes upstream at about 1.5 meters per year due to hydraulic action and rock fracturing.
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Joint-controlled basalt layers create a series of gorges downstream, each marking past waterfall positions.
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Scientists measure retreat rates using radiocarbon dating of river terrace sediments and GPS mapping.
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Wet-season flows exceed 10,000 cubic meters per second, intensifying undercutting beneath the lip.
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Droughts and hydropower diversions downstream reduce flow variability and may slow erosion temporarily.
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The First Gorge hosts the main cataract, while the Eighth Gorge reveals how long-term retreat reshapes valleys.
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Rainforest microclimates thrive on mist-fed slopes, contrasting sharply with surrounding savanna woodlands.
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Geological time scales show the falls will eventually retreat into softer sandstone upstream.
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Understanding this process helps predict landscape evolution and manage tourism infrastructure safely.