This accelerated wind erodes the sand on the upstream face of the dune and deposits it near the top.

这种加速的风侵蚀了沙丘上游面上的沙子，并将其沉积在靠近顶部的地方。

A few seconds later, lacking  support from the rest of the structure, the dam's upstream face collapsed, and  all of Wixom Lake began rushing through.

几秒钟后，由于缺乏其他结构的支撑，大坝的上游面崩溃了， 整个威克瑟姆湖开始涌入。

We include  rock riprap or other armoring on the upstream face so that waves and swift water in the reservoir  can't erode the vulnerable embankment.

我们在上游面添加岩石抛石或其他防护层，这样水库中的波浪和湍急的水流就不会侵蚀脆弱的路堤。