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Late Holocene Spit Evolution On Centennial Timescales In The Southeast Delaware Bay, Usa, Ryan Eli Phillip
Late Holocene Spit Evolution On Centennial Timescales In The Southeast Delaware Bay, Usa, Ryan Eli Phillip
Electronic Theses and Dissertations
The relationship between barrier spit growth and longshore drift is well established. However, the role of storm activity in spit evolution on an intermediate (centennial) timescale is more of a mystery due to a knowledge gap between decadal-scale shoreline processes and millennial-scale stratigraphic data. Recent studies in the northwestern Atlantic basin using ground-penetrating radar (GPR) and optically-stimulated luminescence (OSL) are providing the opportunity to study centennial-scale shoreline evolution and examine similar age storm activity. Cape Henlopen, Delaware exhibits preserved remnants of a long-term northward-growing spit coastline that evolved from a recurved spit complex, to a cuspate spit, to the present-day …
Holocene Formation History Of Mud Depocenters On The Continental Shelf In The Gulf Of Cadiz, Southwestern Spain, Mary Lee King
Holocene Formation History Of Mud Depocenters On The Continental Shelf In The Gulf Of Cadiz, Southwestern Spain, Mary Lee King
Electronic Theses and Dissertations
Holocene mud accumulation on the continental shelf in northern Gulf of Cadiz, from the Guadalquivir River to the Tinto-Odiel Estuary, is described as two types of mud depocenters (MDCs): a sheet-like prodelta and mud belt. Despite a substantial number of investigations of this continental shelf (Somoza et al., 1997; Hernández-Molina et al., 2000; Lobo et al., 2001; synthesis: Lobo et al., 2015), information on Holocene sediment facies and a robust stratigraphic age model remained unestablished (Lobo et al., 2002; and Lobo and Ridente, 2014). Objectives of this study are to describe the dynamics of MDC formation in a chrono- and …
Hardbottom Characterization And Relationship To The Geologic Framework In Long Bay, South Carolina, Cathryn J. Wheaton
Hardbottom Characterization And Relationship To The Geologic Framework In Long Bay, South Carolina, Cathryn J. Wheaton
Electronic Theses and Dissertations
Hardbottom seafloor is a common element among sediment-starved portions of the inner continental shelf along the U.S. Atlantic margin. These areas are characterized by indurated sediment surfaces that are heavily altered by biological and physical processes. Long Bay, in northeastern South Carolina, offers ideal environmental conditions for hardbottom exposure with only patchy Holocene sand deposits, interspersed with extensive hardbottom areas. Here we use high-resolution multibeam bathymetry, CHIRP subbottom profiling and electrical resistivity data, along with surficial sediment samples, hardbottom thin sections, and water column radioisotope (radon-222) analysis to investigate the origin and geologic framework of a region of hardbottom seafloor …