45 



Prfu;? 



0.06 



0.04 



0.02 



0.05 



Figure 3.11: Crest of a shallow water wave at order 5 



0.06 



Pdwl 



-5 



-0.8 -0.6 -0.4 -0.2 



0.2 0.4 0.6 



Figure 3.12: Crest of a shallow water wave at order 6 



