Simulating hurricane Gustav and Ike wave fields along the Louisiana innershelf: Implementation of an unstructured third-generation wave model, SWAN

Mousavi, Seyed Mostafa Siadat; Jose, Felix; Stone, Gregory W.

doi:10.23919/oceans.2009.5422119

Cited by 5 publications

(1 citation statement)

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“…Now STWAVE has been applied with full-plane propagation in all nearshore meshes. Alternatively, ADCIRC has been coupled with the unstructuredmesh version of the ''simulating waves nearshore'' (SWAN) model (SiadatMousavi et al 2009;Zijlema 2010). The model herein called SWAN1ADCIRC employs the same unstructured mesh on the same computational cores, passing information between models through local memory/cache, and thus it can simulate the propagation of waves from deep water to the nearshore with accuracy and efficiency (Dietrich et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Hurricane Gustav (2008) Waves and Storm Surge: Hindcast, Synoptic Analysis, and Validation in Southern Louisiana

Dietrich

Westerink

Kennedy

et al. 2011

Monthly Weather Review

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Hurricane Gustav (2008) made landfall in southern Louisiana on 1 September 2008 with its eye never closer than 75 km to New Orleans, but its waves and storm surge threatened to flood the city. Easterly tropical-storm-strength winds impacted the region east of the Mississippi River for 12–15 h, allowing for early surge to develop up to 3.5 m there and enter the river and the city’s navigation canals. During landfall, winds shifted from easterly to southerly, resulting in late surge development and propagation over more than 70 km of marshes on the river’s west bank, over more than 40 km of Caernarvon marsh on the east bank, and into Lake Pontchartrain to the north. Wind waves with estimated significant heights of 15 m developed in the deep Gulf of Mexico but were reduced in size once they reached the continental shelf. The barrier islands further dissipated the waves, and locally generated seas existed behind these effective breaking zones. The hardening and innovative deployment of gauges since Hurricane Katrina (2005) resulted in a wealth of measured data for Gustav. A total of 39 wind wave time histories, 362 water level time histories, and 82 high water marks were available to describe the event. Computational models—including a structured-mesh deepwater wave model (WAM) and a nearshore steady-state wave (STWAVE) model, as well as an unstructured-mesh “simulating waves nearshore” (SWAN) wave model and an advanced circulation (ADCIRC) model—resolve the region with unprecedented levels of detail, with an unstructured mesh spacing of 100–200 m in the wave-breaking zones and 20–50 m in the small-scale channels. Data-assimilated winds were applied using NOAA’s Hurricane Research Division Wind Analysis System (H*Wind) and Interactive Objective Kinematic Analysis (IOKA) procedures. Wave and surge computations from these models are validated comprehensively at the measurement locations ranging from the deep Gulf of Mexico and along the coast to the rivers and floodplains of southern Louisiana and are described and quantified within the context of the evolution of the storm.

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Section: Introductionmentioning

confidence: 99%