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首页> 外文会议>GeoCongress 2008 >Sediment Contaminants Inside New Orleans, LA Homes Following Hurricane Katrina
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Sediment Contaminants Inside New Orleans, LA Homes Following Hurricane Katrina

机译：卡特里娜飓风过后，路易斯安那州新奥尔良市内的沉积物受到污染

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The flooding of residential areas of New Orleans following hurricane Katrina resulted in suspended bottom sediments from Lake Pontchartrain invading neighborhoods, homes, and businesses. As a result of a selective winnowing/filtering process, only particles of the smallest size, dominated by silts and clays, made their way inside homes and other structures, where they eventually settled out during the stagnation of the floodwaters in the week after Katrina's landfall. Small particles are winnowed from larger ones because water to flood the home must seep through small cracks in doors and windows, thereby preventing all but the finest (< 63 μm) particles from entering the home. These fine particles are often associated with the highest loading of metal and organic contaminants. Key pollutants detected in interior deposited sediments include the heavy metals arsenic, cadmium, lead and vanadium as well as semi-volatile organics dieldrin, chlordane (pesticides), and fluoranthene. The contaminated sediment particles have consequences both for exposure of returning residents and first-responders to hazardous and toxic materials, as well as for disposal of the contaminated debris, resulting in long-term environmental consequences for the residents of New Orleans.
机译：卡特里娜飓风后新奥尔良居民区的洪水泛滥，导致庞恰特雷恩湖的底部沉积物悬浮，侵入了社区，房屋和企业。经过选择性的风选/过滤过程，只有最小尺寸的颗粒（由淤泥和粘土主导）进入房屋和其他建筑物，最终在卡特里娜飓风登陆后一周的洪水停滞期间沉降下来。小颗粒被大颗粒吹走，因为要涌入房屋的水必须从门窗的小裂缝中渗出，从而阻止除最细（<63μm）以外的所有颗粒进入房屋。这些细颗粒通常与金属和有机污染物的最高含量有关。在内部沉积物沉积物中检测到的主要污染物包括重金属砷，镉，铅和钒以及半挥发性有机物狄氏剂，氯丹（杀虫剂）和荧蒽。受污染的沉积物颗粒不仅对返回的居民和急救人员暴露于危险和有毒物质产生影响，还对处置受污染的碎片产生影响，从而对新奥尔良的居民造成长期的环境影响。

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