ADCIRC/SWAN Mesh

FEMA Region II/RAMPP Technical BriefingNew Jersey/New York City Coastal Flood Study

Mesh Development Tools

Surface Water Modeling System (SMS) Surge Field Reconnaissance Feature Arcs Special Considerations & GuidanceAerials Topo/Bathy

Surge Field Reconnaissance

Surge Field Reconnaissance

Surge Field Reconnaissance

Mesh Development – Guidelines

Many lessons learned from other studies Emphasis on providing

consistent guidelines to alleviate future problems that have been seen in other studies. ADCIRC mesh needs “smooth”

geometry and careful element layout

Mesh Development – LED Arcs

Linear Element Detection (LED) – program to extract raised features (railroad, road, dunes, etc.) automatically to make sure they aren’t missed manually

LED Arc

Narrow Channels

Narrow Channels

Feature Arcs

Mesh Development – LED Arcs

Roads

Mesh Development – LED Arcs

Dune

Mesh Development – LED Arcs

Wave Setup in SWAN

Resolution along shoreline increased to account for wave breaking zone Allows SWAN to accurately

capture wave setup physics

ADCIRC/SWAN Mesh

Nodes: 604,695Elements: 1,188,478Min mesh size: 250 ft1 second time step goal

ADCIRC/SWAN Mesh

ADCIRC/SWAN Mesh

ADCIRC/SWAN Mesh

ADCIRC/SWAN Mesh

ADCIRC/SWAN Mesh

Mesh Development – QA/QC process

Emphasis on self-certification. Mesh developers are documenting their decisions as they proceed Detail Check is over-the-shoulder. Review done when arcs where

laid out and then after mesh was developed. Final detail check will be on the combined mesh ITR done on about 10% of initial arc layout. ITR done on the final

combined mesh. Audit done on the final mesh.

Mesh Development – QA/QC (sample detail check form)

ADCIRC testing

ADCIRC testing

ADCIRC testing