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Appendix: List of symbols 
c„ 
c 
g 0 
D 
E 
E 
deep 
f 
8 
h 
h 0 
^deep 
Ah 
H 
TJ 
1 deep 
i 
E 
L h 
^deep 
P 
Po 
Pb 
Phs 
Pn 
/ 
P 
Pb 
Pi 
Qe 
r 
S 
s A 
deep 
t 
T 
T 
deep 
T 
short 
u 
u + ,u 
u h 
li , 
propagation velocity of a wave train 
reference propagation velocity 
dissipation of energy 
wave energy 
wave energy in deep water 
arbitrary function 
friction force 
- horizontal component 
- vertical component 
gravitational acceleration 
undisturbed water depth 
reference water depth 
reference deep water depth 
characteristic change in bottom topography 
wave height (twice the amplitude) 
deep water wave height 
unit vector in the direction of wave propagation 
wave length 
characteristic length for change in bottom topography 
deep water wave length 
pressure 
reference pressure 
pressure (Boussinesq equations) 
pressure (hydrostatic equations) 
surface pressure 
perturbation pressure (linear, non-hydrostatic) 
perturbation pressure (Boussinesq equations) 
perturbation pressure (nonlinear, hydrostatic) 
net source function for wave energy 
vertical coordinate 
wave steepness 
deep water wave 
time 
wave period 
deep water wave period 
short wave period 
horizontal current velocity 
partial solutions for u 
solution at the boundary of external and internal domain 
solution in an external spatial area