ChannelRouting

Functions for channel routing related modules, e.g., MUSK_CH. More...

Functions
FLTPT	manningQ (FLTPT x1, FLTPT x2, FLTPT x3, FLTPT x4)
	Calculates flow rate or flow velocity using Manning's equation. More...
FLTPT	ChannleBottomWidth (FLTPT ch_wth, FLTPT &ch_sideslp, FLTPT &ch_depth)
	Calculate channel bottom width by channel width, side slope, and depth. More...
FLTPT	ChannelWettingPerimeter (FLTPT ch_btmwth, FLTPT ch_depth, FLTPT wtr_depth, FLTPT ch_sideslp, FLTPT ch_wth, FLTPT fps=4.)
	Channel wetting perimeter for both floodplain and not full channel. More...
FLTPT	ChannelWettingPerimeter (FLTPT ch_btmwth, FLTPT wtr_depth, FLTPT ch_sideslp)
	Channel wetting perimeter for not full channel. More...
FLTPT	ChannelCrossSectionalArea (FLTPT ch_btmwth, FLTPT ch_depth, FLTPT wtr_depth, FLTPT ch_sideslp, FLTPT ch_wth, FLTPT fps=4.)
	Cross-sectional area of channel for both floodplain and not full channel. More...
FLTPT	ChannelCrossSectionalArea (FLTPT ch_btmwth, FLTPT wtr_depth, FLTPT ch_sideslp)
	Cross-sectional area of channel for not full channel. More...
FLTPT	StorageTimeConstant (FLTPT ch_manning, FLTPT ch_slope, FLTPT ch_len, FLTPT radius)
	Compute storage time constant for channel (ratio of storage to discharge) More...

Detailed Description

Functions for channel routing related modules, e.g., MUSK_CH.

Function Documentation

ChannelCrossSectionalArea() [1/2]

FLTPT ChannelCrossSectionalArea	(	FLTPT	ch_btmwth,
		FLTPT	ch_depth,
		FLTPT	wtr_depth,
		FLTPT	ch_sideslp,
		FLTPT	ch_wth,
		FLTPT	fps = 4.
	)

Cross-sectional area of channel for both floodplain and not full channel.

Parameters

[in]	ch_btmwth	Channel bottom width
[in]	ch_depth	Channel depth
[in]	wtr_depth	Channel water depth
[in]	ch_sideslp	The inverse of channel side slope (default is 2, slope = 0.5)
[in]	ch_wth	Channel width at bankfull
[in]	fps	The inverse of floodplain side slope (default is 4, slope = 0.25)

Returns

Channel cross-sectional area

ChannelCrossSectionalArea() [2/2]

FLTPT ChannelCrossSectionalArea	(	FLTPT	ch_btmwth,
		FLTPT	wtr_depth,
		FLTPT	ch_sideslp
	)

Cross-sectional area of channel for not full channel.

Parameters

[in]	ch_btmwth	Channel bottom width
[in]	wtr_depth	Channel water depth
[in]	ch_sideslp	The inverse of channel side slope (default is 2, slope = 0.5)

Returns

Channel cross-sectional area

ChannelWettingPerimeter() [1/2]

FLTPT ChannelWettingPerimeter	(	FLTPT	ch_btmwth,
		FLTPT	ch_depth,
		FLTPT	wtr_depth,
		FLTPT	ch_sideslp,
		FLTPT	ch_wth,
		FLTPT	fps = 4.
	)

Channel wetting perimeter for both floodplain and not full channel.

Parameters

[in]	ch_btmwth	Channel bottom width
[in]	ch_depth	Channel depth
[in]	wtr_depth	Channel water depth
[in]	ch_sideslp	The inverse of channel side slope (default is 2, slope = 0.5)
[in]	ch_wth	Channel width at bankfull
[in]	fps	The inverse of floodplain side slope (default is 4, slope = 0.25)

Returns

Channel wetting perimeter

ChannelWettingPerimeter() [2/2]

FLTPT ChannelWettingPerimeter	(	FLTPT	ch_btmwth,
		FLTPT	wtr_depth,
		FLTPT	ch_sideslp
	)

Channel wetting perimeter for not full channel.

Parameters

[in]	ch_btmwth	Channel bottom width
[in]	wtr_depth	Channel water depth
[in]	ch_sideslp	The inverse of channel side slope (default is 2, slope = 0.5)

Returns

Channel wetting perimeter

ChannleBottomWidth()

FLTPT ChannleBottomWidth	(	FLTPT	ch_wth,
		FLTPT &	ch_sideslp,
		FLTPT &	ch_depth
	)

Calculate channel bottom width by channel width, side slope, and depth.

Refers code ttcoef.f in SWAT.

Parameters

[in]	ch_wth	Channel upper width
[in,out]	ch_sideslp	The inverse of channel side slope (default is 2, slope = 0.5), which maybe updated when bottom width < 0
[in,out]	ch_depth	Channel depth, which maybe updated when bottom width < 0

Returns

Channel bottom width

manningQ()

FLTPT manningQ	(	FLTPT	x1,
		FLTPT	x2,
		FLTPT	x3,
		FLTPT	x4
	)

Calculates flow rate or flow velocity using Manning's equation.

If x1 is set to 1, the velocity is calculated. If x1 is set to cross-sectional area of flow, the flow rate is calculated. Refers code Qman.f in SWAT.

Parameters

[in]	x1	cross-sectional flow area or 1, m^2 or none.
[in]	x2	hydraulic radius, m.
[in]	x3	Manning's "n" value for channel.
[in]	x4	average slope of channel, m/m.

Returns

flow rate or flow velocity, m^3/s or m/s.

StorageTimeConstant()

FLTPT StorageTimeConstant	(	FLTPT	ch_manning,
		FLTPT	ch_slope,
		FLTPT	ch_len,
		FLTPT	radius
	)

Compute storage time constant for channel (ratio of storage to discharge)

Parameters

[in]	ch_manning	Manning's n value of channel
[in]	ch_slope	Channel slope
[in]	ch_len	Channel length, m
[in]	radius	Hydraulic radius, m

Returns

Storage time constant