EBP APPLICATIONS Can determine width of active profile if depth of no motion (closure depth) is known or can be estimated h*h* w*w*

EBP APPLICATIONS

•Can determine width of active profile if depth of no motion (closure depth) is known or can be estimated

h*

w*

23

**

32

**

A

hWAWh

BEACH RESPONSE TO CHANGE IN SEA LEVEL

What happens to profile as sea level goes up or down ?

Sea level rise causes profile retreat because just after rise profile is too steep

Recall that so if h increase, dh/dy must decrease to maintain D*

? BIG QUESTION ?

How far should the profile retreat?

dy

dhhD *

SEA LEVEL RISE

http://www.gfdl.noaa.gov/~tk/climate_dynamics/climate_impact_webpage.html

Red indicates regions of the southeastern United States that would be below sea level for regionally uniform rises of one, two, four, and eight meters.

BRUUN RULEGiven some known rise (or fall) in sea level determine the profile retreat (or advance)

Determined in terms of horizontal recession and sea level rise

Dean and Dalrymple, 2002)

Bh

SWSR

*

*

tan

Arises from the profile shifting landward and upward with a sea level rise.

EDELMAN METHOD

Removes requirement that S<<B

SBh

BhWR

o

o

*

** ln Where Bo is

dune height

Dean and Dalrymple, 2002)

STORM SURGE ASSUMING EBP

11

5

3

*

*

* W

R

B

h

B

S

W

R

Requires iteration

Dean and Dalrymple, 2002)

METHOD COMPARISON