Manning Class Reference

Calculates the flux between two open water bodies, using Manning's equation. More...

Inheritance diagram for Manning:

Collaboration diagram for Manning:

Detailed Description

Calculates the flux between two open water bodies, using Manning's equation.

This is the base class for a kinematic wave approach (topography driven) and a diffusive wave approach (water table driven). The only difference between both approaches is the calculation of the flux driving slope. For the model, one of ManningKinematic or ManningDiffusive connection is selected

\[ v = R^{\frac 2 3} \frac{\sqrt{\Delta_z}}{n} \\ q = v \cdot A \]

Where:

• \( A = \frac V l\): Crosssectional area of the wetted crossection, Volume per length
• \( R = \frac A {P(d)}\): The hydraulic radius
• \(P(d)\): the perimeter of the wetted crosssection, a function of reach depth
• \(d(V)\): the depth of the reach, a function of the volume
• \(\Delta_z = \frac{|z_1 - z_2|}{l}\): Slope of the reach
• \(n\): Manning friction number

For the kinematic wave the slope of the river bed is used as slope:

\[\Delta_z = \frac{|z_1 - z_2|}{l}\]

while for the diffusive wave the slope is calculated from the actual water head:

\[\Delta_z = \frac{|h_1 - h_2|}{l}\]

Public Member Functions
real	conc (cmf::math::Time t, const cmf::water::solute &_Solute)
	Returns the concentration of the flux.
flux_node::ptr	get_target (const flux_node &inquirer)
	Returns the other end of a connection than the asking end.
flux_node::ptr	get_target (int index) const
	With index 0, the left node is returned, with index 1 the right node of the connection.
real	get_tracer_filter ()
	A value ranging from 0 to 1 to filter tracers out of the water flux.
real	get_tracer_filter (solute S)
	A value ranging from 0 to 1 to filter tracers out of the water flux.
bool	kill_me ()
	Deregisters this connection from its nodes. Returns true if only one reference is left.
flux_node::ptr	left_node () const
	Returns the left node of this connection.
real	q (const flux_node &inquirer, cmf::math::Time t)
	Returns the current flux through a connection. Negative signs mean out of the inquirer, positive are inflows to the inquirer.
void	refresh (cmf::math::Time t)
	Performes a new calculation of the flux.
flux_node::ptr	right_node () const
	returns the right node of this connection
void	set_tracer_filter (real value)
	A value ranging from 0 to 1 to filter tracers out of the water flux.

Public Attributes
const std::string	type
	A string describing the type of the connection.

Member Function Documentation

conc()

real conc ( cmf::math::Time t, const cmf::water::solute & _Solute )

inherited

Returns the concentration of the flux.

If not overridden, it returns the concentration of the source of the flux (direction depending)

get_tracer_filter()

real get_tracer_filter ( )

inherited

A value ranging from 0 to 1 to filter tracers out of the water flux.

1.0 is no filter and 0.0 means no solute is crossing this connection

set_tracer_filter()

void set_tracer_filter ( real value )

inherited

A value ranging from 0 to 1 to filter tracers out of the water flux.

1.0 is no filter and 0.0 means no solute is crossing this connection