in Delaware Estuary Phil Duzinski 112014 Overview of estuary Coastal plain estuary partially stratified to wellmixed salinity structure Mean salt intrusion 97 km from mouth 13 ID: 685529
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Slide1
Estuarine Turbidity Maximum in Delaware Estuary
Phil Duzinski
11/20/14Slide2
Overview of estuary
Coastal plain estuary, partially
stratified to
well‐mixed salinity structureMean salt intrusion 97 km from mouth1.3106 mt per year dredged from ETM (2.6106 m3 )
Sommerfield
, 2010
NC
BC
BHSlide3
ETM dynamics
“Sediment trap” formed by gravitational circulation where seaward barotropic fresh water river discharge interacts with landward
baroclinic
flow from saline marine water (Schubel, 1968)Interactions between density driven buoyancy and barotropic tidal asymmetries in flood-dominated systems (Chant & Stoner, 2001)Combination of gravitational circulation, tidal asymmetry, and tidal pumping of salt control location of ETM and sediment deposition (Sommerfield & Wong, 2011)Impacts on biogeochemical and primary productivitySlide4
Vertical mixing from tidal asymmetry in Navesink
River, NJ
Chant and Stoner, 2001
Ebb: light water over heavy – stable
Flood: heavy water over
light –
unstableSlide5
Estuarine Gravitational Circulation
Sommerfield
, 2010Slide6
Estuarine Turbidity Maximum
Sommerfield
, 2010Slide7
Impacts of tidal pumping on
salinity
and
null pointSommerfield and Wong, 2011The limit of salt intrusion extends 10‐20 km landward of the null point and ETM
core due to tidal pumping of salt
Slide8
Variability of Sediment Influx and Turbidity
Sommerfield
and
Wong, 2011Slide9
References
Chant
and
Stoner, 2001: Particle trapping in a stratified flood‐dominated estuary, J. Mar. Res., 59, 29–51.Gebert, Sommerfield and Walsh, 2013: Sources, sinks and budget of fine grain sediment in Delaware Estuary, Delaware Science and Environmental Summit, Cape May, NJDelaware Estuary Regional Sediment Management Plan, 2013: Sediment Quantity and Dynamics White Paper Schubel
, 1968: Turbidity maximum of the northern Chesapeake Bay
, Science, 161, 1013–1015.Sommerfield, 2010: Regional Sediment Management Workshop, John Heinz National Wildlife Refuge, Philadelphia, PA
Sommerfield and Wong, 2011: Mechanisms of sediment flux and turbidity maintenance in the Delaware
Estuary, J. Geophys Res, 116, C01005