加积指河水搬运过程中携带物质的沉积。当搬运介质无力将碎屑物质往下搬运时，就将其堆积在河床、坡麓或河漫滩上。
n. accretion ; aggradation
由于河流冲刷和河床加积，沉积层多饱和多孔。
As a result of fluvial scouring and aggrading the riverbed, the alluvial layer is fluid-saturated porous medium.
来了琼海一定要尝尝加积鸭。
高位体系域表现为加积—进积沉积特征。
Highstand system tracts are characterized by acceleration progradation sedimentation.
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