1987). Using these results, Hanson, Kraus, and Nakashima (1989) initially 

 set the K T values to 0.9, 0.3, 0.5, 0.3, 0.7, and 0.1 for segments from east to 

 west, respectively. The parameters Kj and K 2 were set to 0.5 and 0.1, 

 respectively, after initial testing. Wave data from an offshore gauge were 

 used to create an 18-month time series corresponding to the available survey 

 data. Because this time period included effects of Hurricane Bonnie, which 

 made landfall close to the gauge, the wave data required extensive censoring 

 to eliminate spurious extremes and give reasonable estimates of wave 

 conditions at the site. The resulting mean wave height and period at the 

 gauge after modification of the data set were 0.53 m and 5 sec, respectively. 



During the calibration process, the K T values were modified to 0.4, 0.8, 

 0.2, 0.1, 0.0, and 0.0 for segments from east to west, respectively. The 

 authors expected to change these values slightly, since their initial estimates 

 were based on visual observations of dye movement, whereas structure 

 transmission pertains to wave heights and directions. The calculated shoreline 

 position agreed well with the measured position, with locations and widths of 

 salients well-reproduced (Figure 34). The shoreline change corresponding to 

 the gap regions was not predicted so well. The calibrated model was used to 

 predict beach response for a three-year time series. Qualitatively, this 

 prediction compared reasonably well with survey data. 



(2) Lakeview Park, Lorain, Ohio. Hanson and Kraus (1989a, 1991) 

 present simulations of shoreline response to the three-segment detached 

 breakwater project at Lakeview Park, Lorain, Ohio. The purpose of this 

 application was to provide field verification of GENESIS for transmissive 





Shoreline Position (ft) 









■ZZ2 n-r\ r-r-n 



M 







CZZ3 



\ 







EZ2 



T 

 033 '1' 





300 



IV Ik 



r\ t 





200 



j\ A n 



' At 

 i/\ , 

 If I, 



\ * 

 I \ 

 \\ 

 \\ 

 \\ 





100 



- Measured 01/23/86 \y 



— N V 







-- Measured 07/29/87 



\ > 







Calculated 07/29/87 









Holly Beach, LA 

 i i i i i 



1 





■■ ■ 



500 1000 1500 2000 2500 



3000 



Distance Alongshore (ft) 





Figure 34. Preliminary model calibration, Holly Beach, Louisiana (Hanson, 

 Kraus, and Nakashima 1989) 



Chapter 3 Tools for Prediction of Morphologic Response 



59 



