TUFLOW 2D Hydraulic Structures: Difference between revisions
Content deleted Content added
Chris Huxley (talk | contribs) |
Chris Huxley (talk | contribs) |
||
Line 21:
<li>Calculate the ratio of the water area occupied by piers to the gross water area of the constriction (both based on the normal water surface). This value is assigned the letter J in the FHA documentation.</li>
<li>Use the FHA (1978) ''Incremental backwater coefficient for piers'' data to calculate Kp. This is the value which will be entered into TUFLOW as the form loss coefficients.</li>
<li>Digitise <font color="blue">2d_lfcsh</font> or <font color="blue">2d_fcsh_</font> inputs using either a line or polygon feature. When applying FCs the best approach is to view the structure as a collection of 2D cells representing the whole structure, rather than being too specific about the representation of each individual cell:
* Line features will apply the form loss value to a single row of cells across the waterway. The TUFLOW form loss input should be entered representing the total value (eg. FC = 0.2).
* Polygon features will distribute the form loss between multiple cells across the width of the bridge and across the waterway. Due to this the TUFLOW form loss input should be entered as the total value per unit width in the direction of flow (eg. FC = 0.2/20m = 0.01).</li>
| |||