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| Default Value | Unit | Min. | Max. | Brief Description | |
|---|---|---|---|---|---|
| Structure | Select one of the breakwater structures that you want to design. | ||||
| Safety level | Select the design safety level which determines the amount of allowable wave overtopping. | ||||
| Allowable overtopping | 0.03 | l/s/m | 0.03 | 50 | Based on the selected safety level, this shows the allowable overtopping for the breakwater design. |
| Depth type | Toggle between Varying and Uniform. In case of a Varying depth type, the bottom depth provided by Generic Data will be is used. | ||||
| Uniform depth | 10 | m | 0.01 | 9999 | In case a uniform depth type is selected, provide the water depth value. |
| Automated crestheight calculation | True | True | False | In case this is selected, the crest height will be automatically calculated based on the design criteria. In case this option is not selected, provide a crest height. | |
| Slope | 3 | - | 0.25 | 100 | Provide the outer slope of the breakwater (as 1: .., e.g. 1:3). The inner and outer slope slopes are considered the sameequal. |
| Crest width | 5 | m | 0.01 | 999 | Provide the width of the top of the breakwater (crest). |
| Crest height | 0 | m, MSL | 0.01 | 999 | In case the automated crest height calculation is switched ofoff, provide the crest height of the breakwater. |
Design storm conditions
Provide the design storm condition. By clicking on the (
) button, you can also select extreme wave conditions from the generic data.
| Default Value | Unit | Min. | Max. | Brief Description | |
|---|---|---|---|---|---|
| Location | Offshore | Offshore | Nearshore | Indicate whether the design storm conditions are provided at an offshore or nearshore (at the breakwater toe). Using lineair wave transformation theory the wave height is transformed to nearshore conditions in case of offshore storm conditions are provided. | |
| Hs | 3 | m | 0.01 | 20 | Significant wave height during the design storm conditionconditions. |
| Tp | 12 | s | 0.01 | 20 | Wave peak period during the design storm conditionconditions. |
| Water level | 1 | m, MSL | -10 | 10 | Provide the water level at the tip of the breakwater w.r.t. to MSL that is present during storm conditions. |
| Storm duration | 6 | hr | 0.1 | 48 | Total duration of the storm. This is used to calculate the total number of waves that is expected to reach the breakwater. |
| Breaker parameter | 0.73 | - | 0.0001 | 1 | Defines the wave height at which waves start to break. The maximum wave height is defined by the breaker index parameter times the local waterdepth. |
| Offshore depth | 100 | m | 0 | 9999 | In case the design storm conditions are provided at an offshore location, provide the offshore depth of that location. Using lineair wave transformation theory, the wave height is transformed to nearshore conditions. |
Armouring
| Default Value | Unit | Min. | Max. | Brief Description | |
|---|---|---|---|---|---|
| Armour type | Rock | - | Currently only a rock armouring layer is supported. | ||
| Armour density | 2650 | kg/m3 | 1000 | 5000 | Density of the armour layer. |
| Water density | 1025 | kg/m3 | 1000 | 1250 | Density of the water, which should be in between 1000 kg/m3 (e.g. fresh water) and 1025 kg/m3 (e.g. salty water). |
| Layer coefficient | 1 | kt | 0 | 1 | |
| Notional permeability | 0.4 | P | 0.01 | 0.9 | |
| Damage number | 2 | S | 1 | 17 |
Reduction factors
| Default Value | Unit | Min. | Max. | Brief Description | |
|---|---|---|---|---|---|
| Berm reduction | 1 | - | 0 | 1 | Reduce forces in case of expected wave breaking on a berm. A value of 0 indicates the absence of wave breaking due to a berm, a value of 1 indicates full reduction of wave breaking due to a berm. |
| Roughness reduction | 0.4 | - | 0.1 | 1 | Indicate whether the roughness of the armour material reduces wave run-up. 0.1 indicates the absense of wave-run up reduction (smooth surface) whilst 1 indicates full reduction (rough surface). |
| Angle of incidence | 0 | deg cross-shore | -90 | 90 | Indicate whether the waves are approaching the breakwater under an angle. |
Unit cost price
| Default Value | Unit | Min. | Max. | Brief Description | |
|---|---|---|---|---|---|
| Unit rate armour | 20 | €/m3 | 0 | inf. | Provide the unit rate for the armour layer material which is used to calculate the cross-sectional breakwater costs. |
| Unit rate filter | 15 | €/m3 | 0 | inf. | Provide the unit rate for the filter layer material which is used to calculate the cross-sectional breakwater costs. |
| Unit rate core | 10 | €/m3 | 0 | inf. | Provide the unit rate for the core layer material which is used to calculate the cross-sectional breakwater costs. |
Tool limitations
The following processes are not included in the tool: waves approaching under an a cross shore varying angle, bed level changes caused by wave reflection, shoals causing wave breaking etc. Besides, the tool only provides linear cross-sections comprising of 3 default materials, without providing information on the breakwater toe or round heads. Results of the breakwater tool should therefore be interpreted with a considerable range of uncertainty.
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