WHADYA DO? | sharksinyahouse

Hydrologic Connectivity Models

Location of Storm Tide sensor

Measurement of 8.43ft non-wave water height taken in Longport, NJ.

III

2012 Pre-Sandy

2012 Post-Sandy

2014 Post-Sandy

2.5

8.43

40.43

2.5

8.43

40.43

2.5

8.43

229.666

GIF

8.43 vs. Dune(12.75)

13 vs. Dune(12.75)

2012 Pre-Sandy DEM

Color Scale and Custom Histogram Stretch applied to accentuate subtle changes at low-elevation

2012 Post-Sandy DEM

Catastrophe flooding, now in FUN colors!

2014 Post-Sandy DEM

with histogram stretch

8.43ft & 13ft SLR x 0/1Dunes

2012 Post-Sandy. Dune is 12.75ft tall. Thanks to Dr. Chris Parrish for the 3-D visuals!

8.43 vs. Dune(12.75)

13 vs. Dune(12.75)

Comparison to NOAA SLR

NOAA CSC SLR

8.43ft & 13ft SLR x 0/1Dunes

2014 Post-Sandy. Dune is 12.75ft tall. Thanks to Dr. Chris Parrish for the 3-D visuals!

GIF

4 vs. Subsidence(DEM-1)

Subsidence

Studies suggest that the mid-Atlantic will sink approximately 1 foot over the next 100 years. The 2100 max. pred. SLR (4ft) is compared with and without accounting for this subsidence.

See how three different

flood models match up

40.43ft is no match for Lucy!

Lucy

Model Accuracy

Dune Analysis

In a Full Dune Analysis, this dune seen in the Satellite Basemap is similar in height to the one planned, and a frequency graph shows the dune has many values above 12.75ft. The dune is mostly out of the water at 8.43ft, yet submerged at 13ft.

METHODS & RESULTS

TRIAL

DEM

SLR (Ft)

ANALYSES

Marshes

Land-Water Interface

Dune

Land-Water Interface

Bridges and piers were digitized over.

Beachfill Plan - Margate

Go to the Introduction section to learn about this. That should have been your first stop. Guess you must have chickened out and not "gone in the water."

Georeferencing in Google Earth

"Digitization"

Actually it wasn't really digitization -- which in GIS is the manual drawing and creation of digital features to represent true objects, due to shortcomings of the technology. Instead, it was referred to, then extrapolated.

First return DEMs w or w/o DUNE

Dune is 12.75ft tall. Thanks to Dr. Chris Parrish for the 3-D visuals!

Marshes

Marshes fluctuate in how much water they have. They were counted as a possible entry for water.

Overlap with Flood Polygon

DIGITIZATION

WORKFLOW PROCESS

sick codes, nerd
mhhw
"Dumb" Model Counts pixels to be flooded if they fall below the raised water level. This is dumb, since it will say the ocean has flooded places that the water couldn't get to in the first place.
8-Neighbor Model This is what NOAA used. I did not use this, but an adapted version of it.
8-Neighbor Model This is the adaption that was used for the 8-NB process. Considers hydrologic connectivity if two adjacent flooded pixels share a corner or an edge.