Van Metre Peter C, Horowitz Arthur J, Mahler Barbara J, Foreman William T, Fuller Christopher C, Burkhardt Mark R, Elrick Kent A, Furlong Edward T, Skrobialowski Stanley C, Smith James J, Wilson Jennifer T, Zaugg Stephen D
U.S. Geological Survey, 8027 Exchange Drive, Austin Texas, USA.
Environ Sci Technol. 2006 Nov 15;40(22):6894-902. doi: 10.1021/es060933g.
The effects of Hurricanes Katrina and Rita and the subsequent unwatering of New Orleans, Louisiana, on the sediment chemistry of Lake Pontchartrain were evaluated by chemical analysis of samples of street mud and suspended and bottom sediments. The highest concentrations of urban-related elements and compounds (e.g., Pb, Zn, polycyclic aromatic hydrocarbons, and chlordane) in bottom sediments exceeded median concentrations in U.S. urban lakes and sediment-quality guidelines. The extent of the elevated concentrations was limited, however, to within a few hundred meters of the mouth of the 17th Street Canal, similar to results of historical assessments. Chemical and radionuclide analysis of pre- and post-Hurricane Rita samples indicates that remobilization of near-shore sediment by lake currents and storms is an ongoing process. The effects of Hurricanes Katrina and Rita on the sediment chemistry of Lake Pontchartrain are limited spatially and are most likely transitory.
通过对街道泥浆样本以及悬浮沉积物和底部沉积物进行化学分析，评估了卡特里娜飓风和丽塔飓风以及随后路易斯安那州新奥尔良市的排水对庞恰特雷恩湖沉积物化学性质的影响。底部沉积物中与城市相关的元素和化合物（如铅、锌、多环芳烃和氯丹）的最高浓度超过了美国城市湖泊的中位浓度以及沉积物质量指南。然而，浓度升高的范围仅限于第17街运河河口几百米范围内，这与历史评估结果相似。对丽塔飓风前后样本的化学和放射性核素分析表明，湖水水流和风暴对近岸沉积物的再搬运是一个持续的过程。卡特里娜飓风和丽塔飓风对庞恰特雷恩湖沉积物化学性质的影响在空间上有限，而且很可能是暂时的。
