Astronomic Tides, Flows and Hurricane Storm Surge Modeling of the Pascagoula River, MS

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Astronomic Tides, Flows and Hurricane Storm Surge
Modeling of the Pascagoula River, MS
March 4, 2009
Naeko Takahashi Qing Wang
Scott C. Hagen, Ph.D., P.E.
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Objectives

• Develop a high-resolution inlet-based floodplain
  mesh for the Pascagoula River region.
• Incorporate the inlet-based floodplain model into
  the Western North Atlantic Tidal (WNAT) model
  domain, which consists of the Gulf of Mexico, the
  Caribbean Sea, and the western Atlantic Ocean.
• Examine the storm tide dynamics that are setup
  within the Pascagoula River and understand the
  importance of the various meteorological forcings
  and their attribution to the overall physics and
  the ability to describe with our model.
• Astronomic tides, considering the role of marsh
  areas
• Storm surge hydrographs
• Storm tide hydrographs
• Large-scale, local-scale models

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Black Creek
Pascagoula River
Escatawpa River
Red Creek
Big Creek
E. Pascagoula River
W. Pascagoula River
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Inlet
30-50 m
Pascagoula River
West Pascagoula River
60-100 m
40-100 m
40-100 m
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Beardslee Lake Roberson lake
Pascagoula River
Roberson Lake
Outside Spacing 25 m
Beardslee Lake
Pascagoula River
Inside Spacing 100 m
50 m
Escatawpa River
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Pascagoula River and Red Creek Joint Point
13 m
Pascagoula River
25 m
Red Creek
Pascagoula River
40 m
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Big Creek
Big Creek
Escatawpa River
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Atlantic Ocean
Gulf of Mexico
Caribbean Sea
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Mesh Over River Islands and Barrier Islands
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Inlet-based Floodplain Mesh Development
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Model Forcing Astronomic Tide
INPUT 1 WNAT-based mesh
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N
Seven tidal constituents (K1, O1, M2, S2, N2, K2,
and Q1) are applied at the open-ocean
boundary (blue dash line at 60W meridian)
Output locations
ADCIRC
Localized domain (i.e. Inlet-based mesh)
OUTPUT Twenty-three (23) tidal constituents at
each output locations (open-ocean boundary for
localized domain)
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Astronomic Tide Model Results
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Astronomic Tide Model Results
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Storm Surge Hydrograph Boundary Condition
INPUT 2 Wind and pressure data
INPUT 1 WNAT-based mesh
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N
Output locations
ADCIRC
Localized domain (i.e. Inlet-based mesh)
OUTPUT Storm Surge Hydrograph
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Ocean-based Model and Storm Surge Hydrograph
Extraction
Maximum Envelope of Water (maximum storm surge)
WNAT
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Ocean-based Model and Storm Surge Hydrograph
Extraction
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Inlet-based Storm Surge Model Results
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Inlet-based Storm Surge Model Results
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Conclusions

• Incorporating the marsh areas results in
  significant improvement in the astronomic tide
  simulation.
• The large-scale model without floodplains
  produces an acceptable storm surge hydrograph
  B.C. to be used to drive a localized domain.
• The large-scale modeling approach is the most
  adequate towards simulating storm surge dynamics
  however, when a localized domain is the only
  choice, it is necessary to account for the local
  wind and pressure forcing AND the remote effects
  of the wind and pressure forcing through a storm
  surge hydrograph.
• Barrier islands should be meshed over to allow
  wetting and drying.

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Acknowledgement
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Thank You!