Littoral Drift Longshore Sediment Rate
Screen signed CERC-form bulk sediment transport with supplied breaker state/coefficient; no sediment supply, directional convention or validated shoreline evolution is inferred.
Description
CERC-form transport converts signed longshore wave-energy flux into a sediment-volume scenario.
CERC-form transport converts signed longshore wave-energy flux into a sediment-volume scenario. Incident-angle sign sets direction.
Screen signed CERC-form bulk sediment transport with supplied breaker state/coefficient; no sediment supply, directional convention or validated shoreline evolution is inferred.
When to use Littoral Drift Longshore Sediment Rate
Use this tool to screen signed CERC-form bulk sediment transport with supplied breaker state/coefficient; no sediment supply, directional convention or validated shoreline evolution is inferred.
Gather the water, wave, current or profile observations and any supplied calibration constants. Confirm units and the stated coordinate and pressure conventions.
How to use Littoral Drift Longshore Sediment Rate and understand its results
- Gather the water, wave, current or profile observations and any supplied calibration constants. Confirm units and the stated coordinate and pressure conventions.
- Enter breakerWaveHeightM, breakerGroupSpeedMPerSecond, incidentAngleDegrees, waterDensityKgPerM3, sedimentDensityKgPerM3, gravityMPerSecondSquared, sedimentPorosityFraction, cercTransportCoefficient using the field table and calculation rules, then run the tool.
- Read signedLongshoreTransportM3PerSecond. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| breakerWaveHeightM | Breaker wave height m | number | Required |
| breakerGroupSpeedMPerSecond | Breaker group speed m per second | number | Required |
| incidentAngleDegrees | Incident angle degrees | number | Required |
| waterDensityKgPerM3 | Water density kg per m3 | number | Required |
| sedimentDensityKgPerM3 | Sediment density kg per m3 | number | Required |
| gravityMPerSecondSquared | Gravity m per second squared | number | Required |
| sedimentPorosityFraction | Sediment porosity fraction | number | Required |
| cercTransportCoefficient | Cerc transport coefficient | number | Required |
Use positive speeds, densities and gravity with sediment denser than water, porosity in [0,1), nonnegative height/coefficient and angle in (−90,90). Preserve signed output.1
transport = K × wave energy × group speed × sin(angle)cos(angle)/[(sediment density−water density)gravity(1−porosity)] Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| signedLongshoreTransportM3PerSecond | Signed longshore transport m3 per second | number |
{
"input": {
"breakerWaveHeightM": 2,
"breakerGroupSpeedMPerSecond": 1,
"incidentAngleDegrees": 30,
"waterDensityKgPerM3": 1000,
"sedimentDensityKgPerM3": 2000,
"gravityMPerSecondSquared": 10,
"sedimentPorosityFraction": 0.5,
"cercTransportCoefficient": 0.4
},
"output": {
"signedLongshoreTransportM3PerSecond": 0.17320508075688773
}
}Limitations and assumptions
Sediment supply, local calibration and shoreline evolution are not inferred.
Numbers and computed results must be finite; overflow produces an error. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Radiation Stress Flux SX: Compute monochromatic linear-wave shore-normal and cross radiation stresses with caller group/phase ratio and incident angle; no surf-zone closure is assumed. For a complementary task, use Beach Nourishment Fill Volume: Integrate measured target-minus-existing profile fill on supplied stations and length, then account for retention; target cuts error rather than silently crediting cut volume as nourishment.
References
-
Littoral Drift Longshore Sediment Rate — tool.io
Similar or alternative tools
- Radiation Stress Flux SX
Compute monochromatic linear-wave shore-normal and cross radiation stresses with caller group/phase ratio and incident angle; no surf-zone closure is assumed.
- Beach Nourishment Fill Volume
Integrate measured target-minus-existing profile fill on supplied stations and length, then account for retention; target cuts error rather than silently crediting cut volume as nourishment.