地理漫步·世界地理英语30篇（9）
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Deltas Spread Where Rivers Meet Sea
三角洲在河流入海处铺展
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Deltas form where rivers slow down and drop their sediment load.河流流速减缓、沉积物卸载处形成三角洲。
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Their shape depends on river flow, wave energy, and tides.其形态取决于河流流量、波浪能量和潮汐作用。
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Fan-shaped deltas spread evenly; bird’s-foot deltas grow long fingers.扇形三角洲均匀扩展；鸟足状三角洲则延伸出细长分支。
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Wetland plants stabilize new land and filter pollutants.湿地植物稳固新生陆地，并过滤污染物。
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Delta soils are rich, supporting dense agriculture and settlements.三角洲土壤肥沃，支撑密集农业与人类聚居。
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Sea-level rise and dams threaten delta growth and elevation.海平面上升和水坝建设威胁三角洲的生长与高程维持。
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Major deltas host megacities like Shanghai and New Orleans.主要三角洲孕育上海、新奥尔良等超大城市。
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Sediment starvation reduces land-building and increases flood risk.泥沙供应不足削弱造陆能力，加剧洪涝风险。