美国陆军工程师团修建了一座9ｍ高的潜坝,以阻止盐水楔进入新奥尔良以南的城市取水建筑物。潜坝横跨河流宽518ｍ,设计来阻止每年不断沿河床向上游爬升的浓盐水层。陆军工程师团每年监视盐水楔移动,当盐水楔接近供水进水口时,工程师团必须决定是花钱建一潜坝还是冒险让有100多万 The Army Corps of Engineers constructed a 9-meter-high submerged dam to stop salt wedges from entering the city’s water intake structures south of New Orleans. The submarine is 518m wide across the river and is designed to stop the thick brine layer that continues to climb up the riverbed every year. The Army Corps of Engineers monitors the movement of salt wedges each year and as the salt wedges approach the water supply intakes, the engineering team must decide whether to spend money on building a submarine dam or about a million dollars