Also known as
Model type Single
Model part of larger framework
Note on status model
Date note status model
Incorporated models or components:
Spatial dimensions
Spatial extent
Model domain Coastal
One-line model description Barrier Island Translation model
Extended model description BIT Model aims to simulate the dynamics of the principal processes that govern the formation and evolution of a barrier island. The model includes sea-level oscillations and sediment distribution operated by waves and currents. Each process determines the deposition of a distinct sediment facies, separately schematized in the spatial domain. Therefore, at any temporal step, it is possible to recognize six different stratigraphic units: bedrock, transitional, overwash, shoreface aeolian and lagoonal.

coastal evolution, barrier island, wave current interaction,

Name Riccardo Masetti
Type of contact Model developer
Institute / Organization University of Bologna
Postal address 1 V.le Risorgimento, 2
Postal address 2
Town / City Bologna
Postal code 40126
Country Italy
Email address

Name Sergio Fagherazzi
Type of contact Project manager
Institute / Organization
Postal address 1
Postal address 2
Town / City
Postal code
Country United States
Email address

Name Alberto Montanari
Type of contact Technical contact
Institute / Organization
Postal address 1
Postal address 2
Town / City
Postal code
Country United States
Email address

Supported platforms
Other platform
Programming language

Fortran77, Fortran90

Other program language
Code optimized Single Processor
Multiple processors implemented
Nr of distributed processors
Nr of shared processors
Start year development 2006
Does model development still take place? Yes
If above answer is no, provide end year model development
Code development status
When did you indicate the 'code development status'?
Model availability As code
Source code availability
(Or provide future intension)
Source web address
Source csdms web address
Program license type Other
Program license type other Free
Memory requirements 2GB
Typical run time hours

Describe input parameters Sea level curve; rate of lagoonal deposition; rate of overwash; initial shelf profile. The stratigraphic data are organized in a matrix of integers. Every matrix entry corresponds to a stratigraphic unit (bedrock, overwash, transitional, shoreface, aeolian and lagoonal).
Input format ASCII, Binary
Other input format
Describe output parameters Resultant barrier island configuration and sediment distribution along the continental shelf as results of the effects of five different processes: reworking of the beach profile, inner-shelf sediment redistribution, overwash, laggonal deposition and aeolian sediment reworking.
Output format ASCII, Binary
Other output format
Pre-processing software needed? No
Describe pre-processing software
Post-processing software needed? No
Describe post-processing software
Visualization software needed? Yes
If above answer is yes Matlab
Other visualization software

Describe processes represented by the model BIT Model takes into consideration five different processes:
  • reworking of the beach profile. The model assumes that the wave action reworks the beach profile towards an equilibrium configuration described by the Dean's equation;
  • inner-shelf sediment redistribution, which is the redistribution of sediments beyond the beach toe determined by the bottom shear stresses produced by wind waves;
  • overwas, which is the erosion of sediment along the beach profile and its corresponding deposition on the top of the barrier island or in the back-barrier area. Overwash is related to storm surges produced bt extreme atmospheric events;
  • lagoonal deposition, which is the deposition of fine sediments in the accomodation space between the barrier island and the mainland;
  • aeolian sediment reworking, which represents the wind action on the subaerial part of the island.
Describe key physical parameters and equations The dynamics of erosion and deposition are schematized with a relationship, which represents a diffusion scheme that changes the bottom elevation at a rate linearly proportional to the difference between the current and the equilibrium profile, defined by the Dean's equation, and then redistributes the removed or deposited material in equal parts between the contiguous inshore and offshore locations.

The phenomenon of overwash is schematized assuming that the first shoreface element of the barrier island is eroded of a quantity, which is related to the frequency of hurricanes and severe storms and to the difference between the maximum elevation of the barrier and the mean sea level.

Describe length scale and resolution constraints Vertically: cm to m, Horizontally: 50 m to 30 km
Describe time scale and resolution constraints Millennial scale
Describe any numerical limitations and issues --

Describe available calibration data sets
Upload calibration data sets if available:
Describe available test data sets In order to verify the millennial-scale evolution of a barrier island, it is necessary to know the sea level curve, the rate of lagoonal deposition, the rate of overwash and the initial shelf profile. The BIT Model has been applied to the shelf profile in front of Sand Key, Florida.
Upload test data sets if available:
Describe ideal data for testing It would be interesting to have grainsize data in addition to the other data.

Do you have current or future plans for collaborating with other researchers? --
Is there a manual available? No
Upload manual if available:
Model website if any
Model forum / discussion board
Comments --

This part will be filled out by CSDMS staff

OpenMI compliant No but possible
BMI compliant No but possible
WMT component No but possible
PyMT component
Is this a data component
Can be coupled with:
Model info
Riccardo Masetti
Fagherazzi, Montanari
Nr. of publications: --
Total citations: 0
h-index: --"--" is not a number.
m-quotient: 0
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Total citations: 0
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Output Files