Terminology

The following terminology is used in MHKiT:

Term	Definition [unit]
$A_P$	Projected capture area [m^2]
BS	Bretschneider spectrum
$D$	Characteristic length [m]
$D_E$	Equivalent diameter [m]
DEL	Damage Equivalent Load
$E$	Energy [J]
$\eta$	Incident wave [m]
$f$	Frequency [Hz]
$F$	Exceedance probability [%]
Fr	Froude Number
$g$	Gravity [m/s/s]
$h$	Water depth from bottom to water surface (e.g. SWL) [m]
$H$	Wave height [m]
$H_s$	Significant wave height, mean wave height of the tallest third of waves [m]
$H_{m0}$	Spectrally derived significant wave height [m]
$J$	Wave energy flux [W/m]
JS	JONSWAP spectrum
$L$	Capture length [m]
${\lambda }_w$	Wave length [m]
$k$	Wave number, $k=\frac{2\pi }{{\lambda }_w}$ [rad/m]
KC	Keulegan-Carpenter number
$m$	Mass [kg]
$m_k$	Spectral moment of k, for k = 0,1,2,…
$\omega$	Wave frequency, $\omega =\frac{2\pi }{T}$ [rad/s]
$P$	Power [W]
PM	Pierson-Moskowitz spectrum
$Q$	Discharge [m^3/s]
$\rho$	Density [kg/m^3]
$S$	Spectral density [m^2/Hz]
SWL	Still water line
$T_e$	Energy period [s]
$T_m$	Mean wave period [s]
$T_p$	Peak period [s]
$T_z$	Zero-crossing period [s]
$u$	Voltage [V]
$v$	Velocity [m/s]
$V$	Velocity calculated for river and tidal modules [m/s]

Units

The methods in MHKiT use the MKS (meters-kilograms-seconds) system, and assume data is stored in SI units, for example:

• Acceleration = $m/s^2$

• Current = $A$

• Distance = $m$

• Energy = $J$

• Frequency = $Hz$

• Mass = $kg$

• Power = $W$

• Pressure = $Pa$

• Time = $s$

• Velocity = $m/s$

• Voltage = $V$

• Volume = $m^3$