首页 | 本学科首页   官方微博 | 高级检索  
     检索      


The generation and preservation of multiple hurricane beds in the northern Gulf of Mexico
Authors:Timothy R Keen  Samuel J Bentley  W Chad Vaughan  Cheryl Ann Blain
Institution:

a Naval Research Laboratory, Oceanography Division, Stennis Space Center, MS 39529, USA

b Department of Oceanography and Coastal Sciences and Coastal Studies Institute, Louisiana State University, Baton Rouge, LA 70803, USA

c Naval Research Laboratory, Seafloor Sciences Division, Stennis Space Center, MS 39529, USA

Abstract:Cores collected from Mississippi Sound and the inner shelf of the northeast Gulf of Mexico have been examined using 210Pb and 137Cs geochronology, X-radiography, granulometry, and a multi-sensor core logger. The results indicate that widespread event layers were probably produced by an unnamed hurricane in 1947 and by Hurricane Camille in 1969. Physical and biological post-depositional processes have reworked the event layers, producing regional discontinuities and localized truncation, and resulting in an imperfect and biased record of sedimentary processes during the storms. The oceanographic and sedimentological processes that produced these event beds have been simulated using a suite of numerical models: (1) a parametric cyclone wind model; (2) the SWAN third-generation wave model; (3) the ADCIRC 2D finite-element hydrodynamic model; (4) the Princeton Ocean Model; (5) a coupled wave–current bottom boundary layer-sedimentation model; and (6) a model for bed preservation potential as a function of burial rate and bioturbation rate. Simulated cores from the Mississippi Sound region are consistent with the observed stratigraphy and geochronology on both the landward and seaward sides of the barrier islands.
Keywords:hurricanes  numerical models  event beds  geochronology  Gulf of Mexico
本文献已被 ScienceDirect 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号