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Ocean Engineering

Parametric Adjustments to the Rankine Vortex Wind Model for Gulf of Mexico Hurricanes

[+] Author and Article Information
Chan Kwon Jeong

 Dockwise USA, 16340 Park Ten Place, Suite 200, Houston, TX 77084chankwon.jeong@gmail.com

Vijay Panchang

Maritime Systems Engineering Department,  Texas A&M University, 200 Seawolf Parkway, Galveston, TX 77553panchanv@tamug.edu

Zeki Demirbilek1

U.S. Army Engineer Research and Development Center,  Coastal and Hydraulics Laboratory, 3909 Halls Ferry Road, Vicksburg, MS 39180-6199zeki.demirbilek@usace.army.mil

1

Corresponding author.

J. Offshore Mech. Arct. Eng 134(4), 041102 (Jul 12, 2012) (17 pages) doi:10.1115/1.4006148 History: Received February 01, 2011; Revised October 19, 2011; Published July 11, 2012; Online July 12, 2012

Parametric wind models are often used to reconstruct hurricane wind fields from a limited set of hurricane parameters. Application of the Rankine Vortex and other models used in forecasting Gulf of Mexico hurricanes show considerable differences between the resulting wind speeds and data. The differences are used to guide the development of adjustment factors to improve the wind fields resulting from the Rankine Vortex model. The corrected model shows a significant improvement in the shape, size, and wind speed contours for 14 out of 17 hurricanes examined. The effect on wave fields resulting from the original and modified wind fields are on the order of 4 m, which is important for the estimation of extreme wave statistics.

Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Wind-field (m/s) for Hurricane Gordon, 0000 UTC 17 Sept. 2000; Reanalysis (left), and H*Wind field (right)

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Figure 2

Symmetric (left) and asymmetric (right) wind speeds (m/s) during Hurricane Katrina (1200 UTC 28 Aug. 2005); (a) Rankine Vortex model, (b) SLOSH model, and (c) Holland model

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Figure 3

Wind fields (m/s) for hurricanes Ivan, Katrina, and Rita: (a) asymmetric RV model, and (b) H*Wind

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Figure 4

Wind fields (m/s) for hurricanes Dolly and Ike: (a) asymmetric RV model, and (b) H*Wind

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Figure 5

Modeled and measured wind velocities along the central transect

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Figure 6

SWH comparison plot during Hurricane Katrina (Aug. 2005) at NDBC buoy 42 040, located approximately 174 km from the storm track

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Figure 7

H*Wind (left) and RV-model (right) wind speeds (m/s): Katrina (0600 UTC 28 August. 2005), Pc  = 930 (top); Ike (1200 UTC 10 September. 2008), Pc  = 959 (bottom)

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Figure 8

Deformation schematic

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Figure 9

Best-fit line for dc vs Pc

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Figure 10

The d(θ) for different central pressure

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Figure 11

Wind speeds (m/s) during Hurricane Ike (2008, θd  = 305°): H*Wind (left), and RV-model (right)

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Figure 12

Wind speeds (m/s) for Hurricane Ike at UTC 1200 11 Sept. 2008; θd  = 295°, VS  = 4.44 m/s, Pc  = 946 mb (a) H*Wind, (b) RV-model, (c) before angle correction with d(θ), (d) after angle correction with d(θ), (e) after application of both correction factors, and (f) comparison along the central E-W transect

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Figure 13

Wind speed along the central transect for the (a) H*Wind and RV model, (b) H*Wind and RV-model with 10-meter elevation correction factor (≅0.8), and (c) H*Wind and RV-model with the 10-meter elevation correction factor (from Eq. 9)

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Figure 14

Model-data discrepancies for Hurricane Ike: Vm  = 48.6 m/s (left), and best-fit curve based on 400 data points (right)

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Figure 15

Model-data discrepancies for Hurricane Rita with Vm  = 79.2 m/s (left), and best-fit curve based on 400 data points (right)

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Figure 16

Wind speeds (m/s) during Hurricane Katrina (0600 UTC 28 Aug. 2005); (a) H*Wind, (b) RV-model, (c) CRV-model, and (d) comparison along the central transect

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Figure 17

Wind speed during Sept. 2000 at NDBC buoy 42 003

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Figure 18

SWHs during Hurricane Gordon (Sept. 2000) at NDBC buoy 42 003 (located approximately 57 km from storm track)

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Figure 19

Wind speeds (m/s) and SWHs during Hurricane Georges (at 0600 UTC 27 Sept. 1998): (a) H*Wind, (b) CRV-model wind, (c) RV-model wind, (d) SWH (m) using CRV-model wind, (e) SWH (m) using RV-model wind, and (f) the difference SWH (m) between (d) and (e)

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Figure 20

SWH100 (m) for the Gulf of Mexico estimated using (a) RV-model wind, (b) CRV-model wind, and (c) differences between (a) and (b)

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