在河口区由于河流入海后水流扩散、坡度减小，又受海水作用的影响，使所携泥沙在主泓线两侧和前端形成弧形的堆积体，称“河口沙坝”。
长江口崇明、长兴、横沙等岛屿是由全新世长江的河口沙坝孕育而成。
The islands in the Changjiang estuary, such as Chongming, Changxing and Hengsha, are originally of Holocene river-mouth bars.
沉积环境可划分为河口主槽沉积环境、涨潮流沉积环境、浅滩沉积环境、拦门沙坝沉积环境及河口前缘沉积环境。
The dynamic sediment environment is divided into different areas that consist of estuarine deep trough, flood current, Jiaobeisha shoal, estuarine sandbar and seashore outside estuary.
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