Channel Class Reference

A wrapper for channel geometries. More...

Inheritance diagram for Channel:

Collaboration diagram for Channel:

Detailed Description

A wrapper for channel geometries.

Public Member Functions
	Channel (char typecode, double length, double width=1., double depth=0.25)
	Creates a reachtype using a short cut character.
	Channel (const Channel &for_copy)
	Copy constructable.
	Channel (const IChannel &for_wrapping)
	Wraps an existing channel geometry.
	Channel (double length)
	Creates a triangular reach of a length.
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.
Channel &	operator= (const Channel &for_assignment)
	Assignable.
virtual double	qManning (double A, double slope) const
	Calculates the flow rate from a given water volume in the reach.

Constructor & Destructor Documentation

Channel()

Channel	(	char	typecode,
		double	length,
		double	width = 1.,
		double	depth = 0.25 )

Creates a reachtype using a short cut character.

Acceptes one of the following characters:

• 'T' TriangularReach, width and depth are ignored.
• 'R' RectangularReach, depth is ignored
• 'P' PipeReach, depth is ignored, width is the diameter of the pipe
• 'S' SWATReachType, a trapezoid flow cross section, as used in the SWAT model, width (bank width) and depth are used

  Parameters

  typecode	Describes the geometry of the reach cross section.
  length	The length of the channel in m
  width	width of the reach cross section in m (ignored for typecode 'T')
  depth	depth of the reach (ignored for typecode 'T','R','P','S')

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]