Lakes, estuaries and lagoons

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Lakes, estuaries and lagoons
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Particle Settling
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Sediment Transport

• Wave re-suspension
• Wind-driven currents
• Tidal currents

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Tidal Circulation(Mobile Bay, Alabama)
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Galveston Bay Texas
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Variations in tidal influence as valley is
floodedResonating tides-Chesapeake Bay
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Changes in bay circulation and sedimentation with
time
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Tidal Influence will change with time as a valley
is flooded
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Holocene Climate Record for Texas and Western
Louisiana reveals an unstable climate that varies
across the region
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Construction of dams has increased the
vulnerability of estuaries to accelerated
sea-level rise
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Milliken et al., 2008
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Bay Evolution
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Changing accommodation space
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Galveston Bay Evolution
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Valley Morphology
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Bay-head deltas-where sediment supply variations
are most pronouced
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Mapping and dating flooding surfaces
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Reefs drowned by rapid sea-level rise
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Comparison of axial profiles from different bays
shows that some flooding events appear to have
been contemporaneous, thus indicating a eustatic
control, while others were more localized and
caused by changes in sediment supply or flooding
of terraces.
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Comparison of major estuary flooding events and
sea-level curve shows that more frequent changes
occurred when the average rate of rise was 4.2
mm/yr. This is within the predicted rate of rise
estimates from the IPCC for this century.
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