MeanChannel Class Reference

A combination of two channel geometries. More...

Inheritance diagram for MeanChannel:

Collaboration diagram for MeanChannel:

Detailed Description

A combination of two channel geometries.

Public Member Functions
	MeanChannel (const IChannel &channel1, const IChannel &channel2)
	Creates the mean geometry from the two channel geometries.
virtual double	A (double V) const
	Returns the area of the surface for a given volume.
double	get_channel_width (double depth) const
	Calculates the flow width from a given actual depth [m] using the actual IChannel geometry.
double	get_depth (double area) const
	Calculates the actual depth of the reach using the IChannel geometry.
double	get_flux_crossection (double depth) const
	Calculates the wetted area from a given depth using the IChannel geometry.
double	get_length () const
	Length of the reach.
double	get_wetted_perimeter (double depth) const
	Calculates the wetted perimeter from a given actual depth [m] using the actual IChannel geometry.
virtual double	h (double V) const
	Returns the depth of a given volume.
virtual double	qManning (double A, double slope) const
	Calculates the flow rate from a given water volume in the reach.

Member Function Documentation

get_depth()

double get_depth ( double area ) const

virtual

Calculates the actual depth of the reach using the IChannel geometry.

Returns

get_depth of the reach [m]

Parameters

area	Wetted area of a river cross section [m2], can be obtained by V/l, where V is the stored volume and l is the reach length

Implements IChannel.

get_flux_crossection()

double get_flux_crossection ( double depth ) const

virtual

Calculates the wetted area from a given depth using the IChannel geometry.

In most cases use get_flux_crossection=V/l, where V is the stored volume and l is the reach length

Returns

Wetted area of a river cross section [m²]

Parameters

depth

depth of the reach [m]

Implements IChannel.

qManning()

virtual double qManning ( double A, double slope ) const

virtualinherited

Calculates the flow rate from a given water volume in the reach.

\begin{eqnarray*} q_{Manning}&=& A R^{\frac 2 3} \sqrt{\frac {\Delta_z} n} \\ A &=& \frac V l \mbox{, (Crosssectional area of the wetted crossection, Volume per length)} \\ R &=& \frac A {P(d)} \\ P(d) &=& \mbox{ the perimeter of the wetted crosssection, a function of reach depth} \\ d(V) &=& \mbox{ the depth of the reach a function of the volume} \\ \Delta_z &=& \frac{z_{max} - z_{min}}{l} \mbox{ Slope of the reach} \end{eqnarray*}

Returns

Flow rate [m³/s]

Parameters

A	The area of the cross section [m2]
slope	The slope of the reach [m/m]