Sedimentary architecture of a spit-end (Salisbury Beach, Massachusetts): The imprints of sea-level rise and inlet dynamics

Abstract In the vicinity of tidal inlets, the facies architecture of barrier islands is largely controlled by inlet channel shifting and the transfer of sand between the ebb-tidal delta and the adjacent shore, including processes of inlet sediment bypas sing. Merrimack River Inlet is situated in a mixed-energy setting and is characterized by episodic shifting of the ebb channel prior to being stabilized in 1881. Here, we delineate the internal structure and evolution of the updrift barrier-spit terminus by integrating data obtained from ground-penetrating radar transects and sediment cores to document the effects of inlet-associated sedimentation processes. Our results document complex radar and sedimentological facies, which define two distinctive associations of facies, the inlet-distal and -proximal, within the core of the present barrier. These facies are associated with three phases of barrier-terminus evolution: (i) barrier retrogradation, characterized by the preservation of washover and backbarrier marsh facies deposited during sea-level rise, (ii) downdrift barrier progradation, characterized by channel fill and swash platform deposits overlain by foreshore deposits generated by long shore currents, and swash bars migrating to the foreshore from the swash platform, and (iii) foreshore seaward progradation, characterized by cross-beds. This study illustrates the highly complex nature of inlet associated spit-ends of barriers. Likewise, our results shed light on the mechanisms of spit elongation and recurving in a setting where the estuary opening is narrowing.

[1]  R. L. Nichols.  Shoreline changes on Plum Island, Massachusetts , 1942 .

[2]  A. Neal.  Ground-penetrating radar and its use in sedimentology: principles, problems and progress , 2004 .

[3]  T. Aagaard,et al.  Cyclic Sand Bar Migration on a Spit-platform in the Danish Wadden Sea—Spit-platform Morphology Related to Variations in Water Level , 2004 .

[4]  J. Donnelly.  A Revised Late Holocene Sea-Level Record for Northern Massachusetts, USA , 2006 .

[5]  D. FitzGerald,et al.  Morphodynamics and Facies Architecture of Tidal Inlets and Tidal Deltas , 2012 .

[6]  A. C. Redfield,et al.  THE AGE OF SALT MARSH PEAT AND ITS RELATION TO RECENT CHANGES IN SEA LEVEL AT BARNSTABLE, MASSACHUSETTS. , 1962, Proceedings of the National Academy of Sciences of the United States of America.

[7]  S. Leatherman,et al.  Barrier Islands from the Gulf of St. Lawrence to the Gulf of Mexico , 1979 .

[8]  C. King.  Beaches And Coasts. , 1960 .

[9]  G. Kaminsky,et al.  Annual Layers Revealed by GPR in the Subsurface of a Prograding Coastal Barrier, Southwest Washington, U.S.A. , 2004 .

[10]  D. FitzGerald.  Shoreline Erosional‐Depositional Processes Associated with Tidal Inlets , 2013 .

[11]  R. Carter.  The morphodynamics of beach-ridge formation: Magilligan, Northern Ireland , 1986 .

[12]  Glendell Jones,et al.  Radiocarbon Ages from Two Submerged Strandline Features in the Western Gulf of Maine and a Sea-Level Curve for the Northeastern Massachusetts Coastal Region , 1993, Quaternary Research.

[13]  A. Oost,et al.  Island-terminus evolution related to changing ebb-tidal-delta configuration : Texel, The Netherlands , 2006 .

[14]  D. FitzGerald.  Interactions between the Ebb-Tidal Delta and Landward Shoreline: Price Inlet, South Carolina , 1984 .

[15]  S. Heron,et al.  Relict Inlets: Preservation and Occurrence in the Holocene Stratigraphy of Southern Core Banks, North Carolina , 1978 .

[16]  A. P. Annan,et al.  Ground-penetrating radar for high-resolution mapping of soil and rock stratigraphy , 1989 .

[17]  Duncan M. FitzGerald,et al.  New England tidal inlets with special reference to riverine-associated inlet systems , 2002 .

[18]  C. Payton,et al.  Seismic stratigraphy and global changes of sea level; Part 2, The depositional sequence as a basic unit for stratigraphic analysis , 1977 .

[19]  G. R. Olhoeft,et al.  Internal Structure of an Aeolian Dune using Ground‐Penetrating Radar , 2009 .

[20]  D. Daniels.  Ground Penetrating Radar , 2005 .

[21]  A. P. Annan,et al.  Electromagnetic determination of soil water content: Measurements in coaxial transmission lines , 1980 .

[22]  D. FitzGerald.  Origin and Stability of Tidal Inlets in Massachusetts , 2013 .

[23]  David J. Daniels,et al.  Surface-Penetrating Radar , 1996 .

[24]  Naresh Kumar,et al.  Inlet sequence: a vertical succession of sedimentary structures and textures created by the lateral migration of tidal inlets , 1974 .

[25]  J. B. Smith,et al.  Sediment Transport Patterns at the Essex River Inlet Ebb-Tidal Delta, Massachusetts, U.S.A. , 1994 .

[26]  D. FitzGerald,et al.  Radar facies of paraglacial barrier systems: coastal New England, USA , 1998 .

[27]  R. Tye,et al.  Recognition and characterization of Holocene tidal inlet sequences , 1985 .

[28]  D. Hubbard.  MORPHOLOGY AND HYDRODYNAMICS OF THE MERRIMACK RIVER EBB-TIDAL DELTA , 1975 .

[29]  John B. Anderson,et al.  Barrier-island aggradation via inlet migration: Mustang Island, Texas , 2006 .

[30]  William E. Galloway,et al.  Terrigenous Clastic Depositional Systems , 1983 .

[31]  D. Scott,et al.  Quantitative studies of marsh foraminiferal distributions in Nova Scotia : implications for sea level studies , 1980 .

[32]  J. H. Hoyt,et al.  Influence of Island Migration on Barrier-Island Sedimentation , 1967 .

[33]  C. Payton.  Seismic Stratigraphy — Applications to Hydrocarbon Exploration , 1977 .

[34]  David G. Aubrey,et al.  Hydrodynamics and Sediment Dynamics of Tidal Inlets , 1988, Lecture Notes on Coastal and Estuarine Studies.

[35]  S. Heron,et al.  Evolution of a barrier island, Shackleford Banks, Carteret County, North Carolina , 1979 .

[36]  S. Penland,et al.  Morphologic and stratigraphic evolution of muddy ebb‐tidal deltas along a subsiding coast: Barataria Bay, Mississippi River delta , 2004 .

[37]  Nicholas Lancaster,et al.  Aeolian sediments : ancient and modern , 1993 .

[38]  R. Tye.  Geomorphic evolution and stratigraphy of Price and Capers Inlets, South Carolina , 1984 .

[39]  S. Lindhorst,et al.  Anatomy and sedimentary model of a hooked spit (Sylt, southern North Sea) , 2010 .

[40]  W. Gehrels.  Determining relative sea-level change from salt-marsh foraminifera and plant zones on the coast of Maine, U.S.A. , 1994 .

[41]  H. Hass,et al.  The sedimentary architecture of a Holocene barrier spit (Sylt, German Bight): Swash-bar accretion and storm erosion , 2008 .

[42]  H. Keene.  Postglacial Submergence and Salt Marsh Evolution in Mew Hampshire , 1971 .

[43]  M. Hayes.  General morphology and sediment patterns in tidal inlets , 1980 .

[44]  Duncan M. FitzGerald,et al.  Evidence for storm - dominated early progradation of Castle Neck Barrier , 2004 .

[45]  C. Houser,et al.  Onshore Migration of a Swash Bar During a Storm , 2007 .

[46]  H. Jol,et al.  Ground penetrating radar: 2-D and 3-D subsurface imaging of a coastal barrier spit, Long Beach, WA, USA , 2003 .

[47]  G. Giese,et al.  Formation and evolution of multiple tidal inlets , 1993 .

[48]  W. Gehrels.  Middle and Late Holocene Sea-Level Changes in Eastern Maine Reconstructed from Foraminiferal Saltmarsh Stratigraphy and AMS 14C Dates on Basal Peat , 1999, Quaternary Research.

[49]  Charles S Bristow,et al.  The structure and development of foredunes on a locally prograding coast: insights from ground‐penetrating radar surveys, Norfolk, UK , 2000 .

[50]  Maurice L. Schwartz,et al.  Encyclopedia of coastal science , 2005 .

[51]  R. Davidson‐Arnott,et al.  Morphodynamics of intertidal bars in wave-dominated coastal settings — A review , 2006 .

[52]  Walter J. Sexton,et al.  Stratigraphy and Sediment Characteristics of a Mesotidal Ebb-Tidal Delta, North Edisto Inlet, South Carolina , 1988 .

[53]  F. P. Haeni,et al.  Application of Ground‐Penetrating‐Radar Methods in Hydrogeologie Studies , 1991 .

[54]  P. Work,et al.  Mesoscale sediment transport at southeastern U.S. tidal inlets : Conceptual model applicable to mixed energy settings , 1999 .

[55]  H. Lorenzo,et al.  Cyclical Evolution of a Modern Transgressive Sand Barrier in Northwestern Spain Elucidated by GPR and Aerial Photos , 2006 .

[56]  A. Hine.  Mechanisms of berm development and resulting beach growth along a barrier spit complex , 1979 .

[57]  R. Tye,et al.  Tidal Inlet Reservoirs: Insights from Modern Examples , 1993 .

[58]  Edwin Elias,et al.  Long-term morphodynamic evolution of Texel Inlet and its ebb-tidal delta (The Netherlands) , 2006 .

[59]  D. FitzGerald,et al.  Classification of paraglacial barrier systems: coastal New England, USA , 1999 .

[60]  J. W. Pierce,et al.  Holocene Evolution of a Portion of the North Carolina Coast , 1971 .

[61]  W. Gehrels,et al.  The use of Jadammina macrescens (Brady) and Balticammina pseudomacrescens Brönnimann, Lutze and Whittaker (Protozoa: Foraminiferida) as sea-level indicators , 1999 .

[62]  N. Kraus,et al.  Natural mechanisms of sediment bypassing at tidal inlets , 2000 .

[63]  C. Payton,et al.  Seismic stratigraphy and global changes of sea level; Part 6, Stratigraphic interpretation of seismic reflection patterns in depositional sequences , 1977 .

[64]  Harry M. Jol,et al.  Ground penetrating radar of northern lacustrine deltas , 1991 .

[65]  D. Aubrey,et al.  RAPID FORMATION AND DEGRADATION OF BARRIER SPITS IN AREAS WITH LOW RATES OF LITTORAL DRIFT , 1982 .

[66]  Remke L. Van Dam,et al.  Identifying causes of ground‐penetrating radar reflections using time‐domain reflectometry and sedimentological analyses , 2000 .