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 冲积锥; 湍急的河水到达平地后形成的由泥、沙、石、卵组成的锥形沉积物

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