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Cerc Longshore Transport

Estimates annual volumetric longshore sediment transport using the CERC formula from the USACE Coastal Engineering Manual and Shore Protection Manual. Calculates wave energy flux at the breaker line and converts it to a sediment transport rate, accounting for wave angle, sediment and water densities, and porosity. Used in coastal engineering to predict littoral drift and inform beach nourishment or breakwater design.

inputs

6 fields

context

4 archetypes

engine

with-tool

outputs

3 scored fields

contract fields

Parameter Map

6 inputs to 3 scored outputs

  • breaking_wave_height_m

    float

    Significant breaking wave height H_b

    0.3 to 5m

  • wave_angle_at_breaking_deg

    float

    Wave angle at breaking relative to shore-normal alpha_b (positive = left-to-right looking shoreward)

    -45 to 45degrees

  • k_coefficient

    floatfrom archetypehidden in hard

    CERC empirical transport coefficient K

    0.1 to 1-

  • sediment_density_kg_m3

    floatoptionalfrom archetypehidden in hard

    Sediment grain density rho_s

    2500 to 2800kg/m³

  • water_density_kg_m3

    floatoptionalfrom archetypehidden in hard

    Water density rho_w

    1000 to 1035kg/m³

  • porosity

    floatoptionalfrom archetypehidden in hard

    In-situ sediment porosity p

    0.3 to 0.5-
energy_flux_w_mtol 0.03

Wave energy flux at breaking (E*Cg)_b in W/m

transport_rate_m3_yrtol 0.05

Volumetric longshore transport rate Q_l (m³/year, absolute value)

transport_directiontol 0.01

Transport direction: 1.0 = left-to-right, -1.0 = right-to-left (looking shoreward)

visibility contract

Difficulty Ladder

all_giveneasy

Moderate wave height, all parameters given — straightforward CERC formula application

all fields visible
all_givenmedium

Larger waves, steeper angles, all parameters given — larger numbers but same formula

all fields visible
partialhard

K coefficient, sediment density, water density, and porosity hidden — agent must infer from site description

k_coefficientsediment_density_kg_m3water_density_kg_m3porosity

scenario bands

Archetype Atlas

exposed_sandy_coast

3 contexts

High-energy exposed sandy coastline with quartz sand and large oblique swell

breaking_wave_height_m2 to 4
wave_angle_at_breaking_deg10 to 30
k_coefficient0.3 to 0.45
sediment_density_kg_m32600 to 2700

nsw-south-coast-swell / wa-southwest-capes / sa-great-ocean-road

moderate_energy_beach

3 contexts

Moderate-energy beach with medium swell and modest wave angles

breaking_wave_height_m0.8 to 2
wave_angle_at_breaking_deg5 to 15
k_coefficient0.32 to 0.42
sediment_density_kg_m32600 to 2700

sunshine-coast-qld / newcastle-nsw-beach / mandurah-wa-coast

sheltered_embayment

3 contexts

Low-energy sheltered embayment with short-period wind waves and fine sand

breaking_wave_height_m0.3 to 0.8
wave_angle_at_breaking_deg5 to 20
k_coefficient0.35 to 0.5
sediment_density_kg_m32550 to 2650

moreton-bay-qld / port-phillip-bay-vic / cockburn-sound-wa

high_energy_headland

3 contexts

High-energy headland-controlled pocket beach with coarse sand and strong oblique waves

breaking_wave_height_m3 to 5
wave_angle_at_breaking_deg15 to 45
k_coefficient0.2 to 0.35
sediment_density_kg_m32650 to 2800

byron-bay-nsw-headland / noosa-heads-qld / cape-naturaliste-wa

rendered task

Generation Preview

nsw-south-coast-swell-exposed-sandy-coast-preview

difficulty
hard
visibility
partial
archetype
exposed_sandy_coast
site context
nsw-south-coast-swell
instruction excerptcerc-longshore-transport_calc.py

visible fields

  • breaking_wave_height_m2 to 4 m
  • wave_angle_at_breaking_deg10 to 30 degrees

withheld schema

k_coefficientwater_density_kg_m3porositysediment_density_kg_m3energy_flux_w_mtransport_rate_m3_yrtransport_direction
High-energy exposed sandy coastline with quartz sand and large oblique swell. nsw-south-coast-swell. Required outputs: energy_flux_w_m, transport_rate_m3_yr, transport_direction