alluvial fan

柯林斯词典

alluvial fan (also alluvial cone)

• 1. N a fan-shaped accumulation of silt, sand, gravel, and boulders deposited by fast-flowing mountain rivers when they reach flatter land 沖積錐; 湍急的河水到達平地後形成的由泥、沙、石、卵組成的錐形沉積物

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