后退海岸，又名海岸侵蚀， 是指在自然力（包括风、浪、流、潮）的作用下，海洋泥沙支出大于输入，沉积物净损失的过程，即海水动力的冲击造成海岸线的后退和海滩下蚀。
支持者们从一张照片里指出了一些特征，例如阶梯状的“海滩”；可以想象，随着湖泊或者海洋蒸发以及海岸线的后退，这些阶梯状的“海滩”可能会遗留下来。
Proponents point to features such as the terraced "beaches" shown in one image, which could conceivably have been left behind as a lake or ocean evaporated and the shoreline receded.
威尼斯附近的海岸线也会后退30公里，的里雅斯特和威尼斯之间的区域将成为最脆弱的区域之一。
The coastline near Venice could also go back 30 kilometres and the area between Trieste and Venice is one of the most vulnerable.
研究人员们声称，到本世纪末还平面将会上升几近半米，迫使海岸线后退几百米。
The oceans will rise nearly half a metre by the end of the century, forcing coastlines back by hundreds of metres, the researchers claim.
应用推荐