1. 冲积层：alluviation 冲积 | alluvion 冲积层 | alluvium 冲积层

2. 沙洲：alluvial 冲积的 | alluvion 沙洲 | alluvium 冲积层

3. 涨滩;冲积层冲刷;拍岸浪：alluviation 冲积 | alluvion 涨滩;冲积层冲刷;拍岸浪 | alluvious 冲积的

4. 击岸波：alluvion 波浪冲击;海岸冲积地 | alluvion 击岸波 | alluvion 击岸波泛滥

noun

1. clay or silt or gravel carried by rushing streams and deposited where the stream slows down

Synonym: alluvial sedimentalluvial depositalluvium

2. the rising of a body of water and its overflowing onto normally dry land

e.g. plains fertilized by annual inundations

Synonym: floodinundationdeluge

3. gradual formation of new land, by recession of the sea or deposit of sediment