Time varying infiltration
A common characteristic in cold climates is that infiltration is reduced during the winter months. When the air temperature is cold enough to maintain precipitation as snow, then infiltration will be limited in any case. However, in the spring, when snow storage is melting, then infiltration may still be limited for some period of time.
There is an Extra Parameter time varying infiltration function to reduce infiltration in winter. The time varying infiltration function is a modification of the Surface-Subsurface Leakage Coefficient (V1 p. 269) to allow it to be time varying.
The time varying dfs2 file must cover the model domain and the model simulation period.
|
Parameter Name |
Type |
Value |
|---|---|---|
|
time varying ol leakage coefficient |
Boolean |
On |
|
leakage coefficient dfs2 file name |
filename |
.dfs2 file |
|
leakage coefficient item number |
integer |
item number in dfs2 file, greater than zero |
|
Optional |
||
|
mean step accumulated leakage coefficient |
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.
Note The areas in which these values will be applied has not changed. The areas are defined in the original Surface-Subsurface Leakage Coefficient (V1 p. 269) dialogue. That is, the values specified in the User Interface act as a mask, where the leakage coefficient is active if a non-delete value is specified in the user interface.
