HydroGeoSphere/Channel Flow

Channel domains, can be set up using the following instructions, as outlined in Section 2.3.2.4 and in Equation 2.65.

Default Channel Properties
Unless the user modifies the default values, all channel zones in the domain will be assigned the default properties. The default values, Table 5.10, can be and are recommended to be modified to fit the model application.


 * &bull; &bull; &bull;

Example Channel Flow Instructions
As an example, the following set of instructions, with prefix.cprops file Figure 5.14, could be inserted into the prefix.grok file to produce a channel:

The channel domain example opens the property file prefix.cprops, shown in Figure 5.14, and creates a 1 m wide channel. The channel one properties are read into grok.


 * Figure 5.14: Sample channel domain property file prefix.cprops


 * &bull; &bull; &bull;

Dual nodes for channel flow
Scope: .grok

This instruction causes the channel flow scheme to use dual node approach.
 * &bull; &bull; &bull;

Type rectangle
Scope: .grok .cprops
 * 1) ChanWidth Channel Width [L].

The width of the rectangular channel.
 * &bull; &bull; &bull;

Type trapezoid
Scope: .grok .cprops
 * 1) ChanWidth Channel Width [L].
 * 2) ChanTrapBankAngle Channel Bank Angle [degree].

The width of the bottom of the trapezoidal channel and the angle of the bank from the vertical line.
 * &bull; &bull; &bull;

Type circle
Scope: .grok .cprops
 * 1) ChanRadius Channel Radius [L].

The radius of the circular channel.
 * &bull; &bull; &bull;

Type general
Scope: .grok .cprops
 * 1) nChanTab The number of water depth values in the table.
 * 2) i=1, nChanTab, ChanTabD, ChanTabAF, ChanTabWP, ChanTabTW Tables for water depth, area of flow, wetted perimeter, and top width.

A tabular form of data can be used to specify the area of flow, wetted perimeter, and top width for given depth values.
 * &bull; &bull; &bull;

Friction
<tt>Scope: .grok .cprops</tt>
 * 1) ChanFrictn Manning friction for the channel.

Manning friction coefficient for the zone chosen.
 * &bull; &bull; &bull;

Rill storage height
<tt>Scope: .grok .cprops</tt>
 * 1) ChanRillStor Channel rill storage height.

A minimum water depth required for flow.
 * &bull; &bull; &bull;

Obstruction storage height
<tt>Scope: .grok .cprops</tt>
 * 1) ChanOnstructStor Channel obstruction storage height.

Obstruction storage height.
 * &bull; &bull; &bull;

Streambed thickness
<tt>Scope: .grok .cprops</tt>
 * 1) ChanStrmBedThick Thickness of streambed.

Streambed thickness that defines the coupling between channel and subsurface.
 * &bull; &bull; &bull;

Streambed conductivity
<tt>Scope: .grok .cprops</tt>
 * 1) ChanStrmBedK Hydraulic conductivity of streambed.

Streambed hyarulic conductivity together with thickness to define the coupling conductance between channel and subsurface.
 * &bull; &bull; &bull;

Bank height
<tt>Scope: .grok .cprops</tt>
 * 1) ChanBankHeight Height of river bank.

River bank height to define the interaction between the channel and overland flow domains.
 * &bull; &bull; &bull;