Time varying surface roughness (Manning’s M)
The time varying roughness function can be used any time the roughness changes over the simulation period. For example, the roughness can be correlated to changes in vegetation type over time, or climatic conditions (winter vs. summer).
The time varying dfs2 file must cover the model domain and the model simulation period.
|
Parameter Name |
Type |
Value |
|---|---|---|
|
time varying ol manning number |
Boolean |
On |
|
manning number dfs2 file name |
filename |
.dfs2 file, Item Type: Manning’s M |
|
manning number item number |
integer |
item number in dfs2 file, greater than zero |
|
Optional |
||
|
mean step accumulated manning number |
Boolean |
On |
By default, the Time Series Types (V1 p. 147) is Instantaneous, but their is an option that allows you to use Mean Step Accumulated values. The use of Mean Step Accumulated does not change the meaning of the item, but changes the way the values are interpolated.
Note The code does not check for the time series type.