Probabilistic parameters for the Detailed assessment method has to be inputted.
Input screen: The probabilistic parameters are fixed,
Only the Mean "Area ratio" can be changed (white box)
6.1 Parameters detailed assessment method
Name in English | Name in Dutch | Description | Symbol | Unit | Default + decimals + (range) |
---|---|---|---|---|---|
Allowable probability of failure | Toelaatbare faalkans | Required probability of failure |
| 1:n year | 0 (1-1000000) |
Percentage p.o.f. flow slide | Faalkans zettingsvloeiing | Percentage of probability of failure by flow slide |
| –
| 100.00 (0-1) |
Mean (Area ratio) | Gemiddeld (Gebiedsratio) | c = Area2 / Area1 | c | – | 1.40 (1-5) |
Considered dike length | Beschouwde dijk lengte | Length of the dike section | Ltrajectlengte | m | 0.00 (1-10000) |
Migration velocity | Migratie snelheid vooroever | Migration velocity of the foreland | Vmig | m/year | 0.00000 (0.0001-100) |
Cohesive layers factor | Cohesieve lagen factor | Factor which evaluates the presence of cohesive layers or peat layers within the sand body. Cohesive and peat layers start to play a role if their (individual) thickness is larger than 0,5 m (CUR113, 2008). If their thickness exceeds 5 m it can be assumed in most situations the breach will be stopped. The following values are proposed:
| Fcohesive layers | – | 0.00 (0-100) |
6.2 Probabilistic parameters
D-FLOW SLIDE applies a stochastic distribution for the 4 following parameters.
Name in English | Name in Dutch | Description | Symbol | Unit | Default |
---|---|---|---|---|---|
Relative height upper part | Relatieve hoogte bovenste deel | Ratio between the height of the upper steep part (D) and the channel height (H). | D/H |
|
|
Mean | Gemiddelde | – | 0.43 (fixed value) | ||
Standard deviation | Standaard afwijking | – | 0 (fixed value) | ||
Distribution | Verspreiding | Deterministic (fixed) | |||
Slope lower part | Helling laagste deel | The slope of the lower part. | γ | – |
|
Mean | Gemiddelde | – | 15.9 (fixed value) | ||
Standard deviation | Standaard afwijking | 4.6 (fixed value) | |||
Distribution | Verspreiding | Normal (fixed) | |||
Slope upper steep part | Helling bovenste steile deel | The slope of the upper steep part. | β | – |
|
Mean | Gemiddelde | – | 2.6 (fixed value) | ||
Standard deviation | Standaard afwijking | 0 (fixed value) | |||
Distribution | Verspreiding | Deterministic (fixed) | |||
Area ratio | Gebiedsratio | The area ratio: c = Area2 / Area1 | c | – |
|
Mean | Gemiddelde | – | 1.40 (1-5) | ||
Standard deviation | Standaard afwijking | 0 (fixed value) | |||
Distribution | Verspreiding | Deterministic (fixed) |