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2.0.0b10
catchment modelling framework
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2.0.0b10
catchment modelling framework
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Structure for the description of structural parameters of a reach. More...
Inheritance diagram for SWATReachType: Collaboration diagram for SWATReachType:Structure for the description of structural parameters of a reach.
Uses the SWAT IChannel geometry (see SWAT Theoretical Documentation, Version 2005 (ch. 7:1.1), Neitsch et al. 2005), in this class referenced as SWATtheoDoc. Differences to the SWAT geometry: The flood plain is not plain, but has a small slope=0.5%, but has an infinite width
Public Member Functions | |
| SWATReachType (double l) | |
| Creates a new reach structure with standard values (small natural river) BottomWidth = 3m, ChannelDepth = 0.5m, BankSlope = 2, nManning = 0.0035, FloodPlainSlope = 200. | |
| SWATReachType (double l, double BankWidth, double Depth) | |
| Creates a new reach structure from a give width and depth. | |
| virtual double | A (double V) const |
| Returns the area of the surface for a given volume. | |
| virtual double | get_channel_width (double depth) const |
| Calculates the flow width from a given actual depth [m] using the actual IChannel geometry. | |
| virtual double | get_depth (double area) const |
| Calculates the actual depth of the reach using the IChannel geometry. | |
| virtual 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. | |
| virtual 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. | |
Public Attributes | |
| double | BankSlope |
| Inverse slope of the river bank \( \Delta_{bank} \left[\frac m m\right] \). | |
| double | BottomWidth |
| get_channel_width of the IChannel bottom \( w_{bottom} [m] \) | |
| double | ChannelDepth |
| get_depth of the IChannel \( d_{IChannel} [m] \) | |
| double | FloodPlainSlope |
| Inverse slope of the flood plain \( \Delta_{flood\ plain} \left[\frac m m\right] \). | |
| SWATReachType | ( | double | l, |
| double | BankWidth, | ||
| double | Depth ) |
Creates a new reach structure from a give width and depth.
| l | length of the channel [m] |
| BankWidth | get_channel_width of the reach from bank to bank [m] |
| Depth | Depth of the reach [m] |
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virtual |
Calculates the flow width from a given actual depth [m] using the actual IChannel geometry.
\begin{eqnarray*} \mbox{If } d\le d_{IChannel} && \\ w &=& w_{bottom} + 2 \Delta_{bank} d \\ \mbox{else, } && \mbox{if the river floods the flood plain} \\ w &=& w_{bank} + 2 \Delta_{Floodplain} (d-d_{IChannel} \\ \end{eqnarray*}
Implements IChannel.
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virtual |
Calculates the actual depth of the reach using the IChannel geometry.
\begin{eqnarray*} d &=& \sqrt{\frac{A}{\Delta_{bank}} + \frac{{w_{bottom}}^2}{4 {\Delta_{bank}}^2}} - \frac{w_{bottom}}{2 \Delta_{bank}} \\ \mbox{If } d>d_{IChannel} &&\\ d&=&d_{IChannel}+\sqrt{\frac{A-A(d_{IChannel})}{\Delta_{flood\ plain}} + \frac{{w(d_{IChannel})}^2}{4 {\Delta_{flood\ plain}}^2}} - \frac{w(d_{IChannel})}{2 \Delta_{flood\ plain}} \\ \end{eqnarray*}
| 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.
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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
\begin{eqnarray*} \mbox{If } d>d_{IChannel} &&\\ A &=& \left(w_{bottom} + \Delta_{bank} d\right) d \\ \mbox{else, } && \mbox{if the river floods the flood plain} \\ A &=& A(d_{IChannel}) + \left(w(d_{IChannel} + \Delta_{flood\ plain} \left(d-d_{IChannel}\right)\right) (d-d_{IChannel}) \\ \end{eqnarray*}
| depth | Depth of the reach [m] |
Implements IChannel.
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virtual |
Calculates the wetted perimeter from a given actual depth [m] using the actual IChannel geometry.
\begin{eqnarray*} \mbox{If } d\le d_{IChannel} && \\ P &=& w_{bottom} + 2 \sqrt{1+ {\Delta_{bank}}^2} d \\ \mbox{else, } && \mbox{if the river floods the flood plain} \\ P &=& P(d_{IChannel} + 2 \sqrt{1+ {\Delta_{flood\ plain}}^2} (d-d_{IChannel}) \\ \end{eqnarray*}
| depth | Actual depth of the reach [m] |
Implements IChannel.
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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*}
| A | The area of the cross section [m2] |
| slope | The slope of the reach [m/m] |
