In addition to these types of plots, graphics contours showing differences in 

 two solution sets can provide informative comparisons. For example, Figure 17 

 was generated to investigate the change induced by jetty construction by plotting 

 the difference in velocity magnitude for hydrodynamic model simulations of a 

 1947 bathymetry (pre-jetty construction) and a 1996 bathymetry (post-jetty 

 construction). The plot shows the difference in spring ebb-tide velocity 

 magnitude. Positive values (towards the blue end of the spectrum) denote 

 increases in velocity magnitude, and negative values (towards the red end) denote 

 decreases. Units are in feet per second. 



Figure 1 7. Example of comparison of solutions 



The above examples illustrate the diagnostic utility of selecting the correct 

 graphical format for output display from the toolbox models. In addition, the 

 diagnostic benefits gained by adopting the suggested formats increase with the 

 use of standardized formats. Standardizing output formats permit the 

 establishment of an experience database. As more case studies investigate the 

 same tools and display similar information in standard formats, comparisons 

 between case studies of different shoal types will become easier. This 

 standardization will expand the state of the science and utility of the DMS 

 approval. 



36 



Chapter 4 DMS-Analytical Toolbox 



