Secondly, the detailed model needs some extra parameters.
The probabilistic parameters are fixed, Only the Mean "Area ratio" can be changed (white box)
Parameters for the Detailed (TR) check
3.3.1 Parameters detailed assessment
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) |
Area ratio | Gebiedsratio | c = Area2 / Area1 | c | – | 1.40 (1-5) |
Max. allowable retrogression length | Max. toelaatbare inscharingslengte | The maximum allowable length for retrogression | Lallowable | m | 0.000 (0.001-1000) |
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) |
3.3.2 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) |