IIAB/Overview/IIAB Users Guide
Inlet Impacts on Adjacent Beaches - IIAB Java Program User's Guide
PURPOSE:
This Wiki-Technical note provides a User's Guide to the IIAB Java Program, which is available for download on the CIRP website[[1]]. For an inlet system bounded by adjacent beaches, the IIAB Program uses methods outlined in the Coastal Engineering Manual (CEM) Part V-6 to estimate the alongshore extent of inlet impact based on the volume captured by the inlet. The user can load shoreline position, ebb and flood shoal volume (or volume change), and Operation & Maintenance (O&M) dredging volumes (or volume change) data to view plots and results.
CITATION:
Rosati, J.D., and Sumner, C.A. 2012. "Inlet Impacts on Adjacent Beaches - IIAB Java Program User's Guide," Wiki-TN-12-2, Vicksburg, MS: U.S. Army Engineer Research
and Development Center.
INTRODUCTION:
The Inlet Impacts on Adjacent Beaches (IIAB) Java Program applies methods discussed in the Coastal Engineering Manual (CEM) Part V-6 (see p. V-6-29) to estimate the volumetric impact of an inlet on the adjacent beaches. Generally, the methods balance volume change on the updrift and downdrift beaches with the volume captured by the inlet, accounting for Operation & Maintenance (O&M) dredging (Figure 1).
Five methods are described in the CEM to estimate the alongshore extent of inlet influence: (1) evaluation of historical shoreline (or volumetric) change; (2) even-odd analysis;(3) alongshore variations in beach morphology;(4) wave refraction analysis; and (5) examination of the "total inlet sink", or volume captured by the inlet during the period of interest. The IIAB Program facilitates evaluation of Methods 1, 2, and 5, using shoreline position, berm crest and depth of closure data; ebb and flood shoal volume (or volume change) data; and O&M dredging volumes (or volume change) data. The user can upload *.csv (comma separated values) files with the data; example data files are provided both in U.S. customary and metric units. IIAB and the example files can be downloaded from the CIRP website [[2]], copied to a directory on the user's PC and unzipped.
AN OVERVIEW OF THE GRAPHICAL USER INTERFACE:
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INPUT FILE STRUCTURE:
All input files should be in either the .csv or .txt file formats. For either file format, the structure of the data within the file will be exactly the same.
Shoreline data files should be formatted as follows with all values delimited with commas:
The number of years or data sets
Date1, Date2, etc.....
Distance from inlet, berm, depth of closure, shore position at year1, shore position at year2, etc
0(inlet),0,0,0,0....etc
....
Distance from inlet,berm,depth of closure,shore position at year1,shore position at year2,etc.
The center line of the inlet must be marked with just a '0' for every column across that row. Here is an example of a properly formatted file with two years of data (1927 and 1956):
2
1927,1956
37.5,3,6,110,105.5
35,3,6,105,97.5
32.5,3,6,100,103.2
30,3,6,97,99
27.5,3,6,102,97.6
25,3,6,111,113.1
22.5,3,6,87,94.4
20,3,6,65,70.4
17.5,3,6,89,114.6
15,3,6,72,93.2
12.5,3,6,90,107.5
10,3,6,92,120.5
7.5,3,6,95,150
5,3,6,102,158.2
2.5,3,6,101,176.3
0,0,0,0,0
-2.5,2.6,6,55,47
-5,2.7,6,47,-39
-7.5,2.7,6,40,-59
-10,2.8,6,54,-12
-12.5,2.9,6,62,20
-15,3,6,87,78
-17.5,3.1,6,76,79.4
-20,3,6,62,52
-22.5,3,6,66,54
-25,3,6,78,51
-27.5,3,6,87,60
-30,3,6,82,66
-32.5,3,6,92,68
-35,3,6,98,80
-37.5,3,6,102,90
Data may also be formatted and saved in excel instead of a text editor, the user must make sure to save the file as a .csv. This can be done by using the 'save as' feature of excel and then choosing the CSV format under 'save as type'. Figure A shows a properly formatted shoreline data file.
O & M dredging data should be formatted in this manner (Figure B shows the data properly formatted in excel):
yearA, o&m Dredged in year A
yearB, o&m Dredged in year B
...
yearN, o&m Dredged in year N
ebb and flood shoal data should be enter in this manner (Figure C shows the data properly formatted in excel):
yearA, Ebb Volume1, (or Ebb Volume rate), Flood Volume1, (or Flood Volume Rate)
YearB, Ebb Volume2, (or Ebb Volume rate), Flood Volume2, (or Flood Volume Rate)
If no rates are used, user should enter "0" as follows, if no volume data is being used, enter "0"
For example:
1927, 10076200,0,17983456,0
1956,11447900,0,18543700,0
UPLOADING FILES:
First, the user should use the appropriate units he or she will be using. Selecting 'U.S. Customary Units' or 'Metric Units' will force all inputs to be of that units system selected. To upload a file, click on 'Browse for file' and browse for the appropriate shoreline data file. If the user is working in customary units, he or she will need to select the appropriate units for the 'Distance from inlet' data which are either in feet or miles. Then the user can enter the optional input data or proceed on. When finished inputting data, the fields 'Year 1' and 'Year 2' will self populate with the available years in the shoreline data. The user should then select the two years he or she wishes to run the calculations on and click on 'Calculate' Please note, 'Year 1' must come before 'Year 2' and 'Year 1' and 'year 2' can not be the same year.
For the optional data, the user should click the check-boxes above the buttons for the additional input they wish to enter. Then they should click the two browse buttons and browse for the appropriate files.
CALCULATIONS:
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DISCUSSION:
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CONCLUSIONS:
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REFERENCES:
ref1 ref2