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built templatetidal-water-levelswith-tool

Tidal Prism

Calculates the tidal prism exchanged by an estuary, lagoon, or basin using the reduced relation P = basin surface area x tidal range. It also estimates mean exchange flow and mean inlet velocity from the inlet flow area and exchange duration, giving a deterministic coastal hydraulics screening calculation.

inputs

5 fields

context

3 archetypes

engine

with-tool

outputs

4 scored fields

contract fields

Parameter Map

5 inputs to 4 scored outputs

  • basin_surface_area_m2

    float

    Water surface area of the tidal basin

    10000 to 50000000m2

  • tidal_range_m

    float

    Representative tidal range over the exchange cycle

    0.1 to 8m

  • inlet_width_m

    float

    Hydraulic width of the inlet throat

    5 to 1000m

  • inlet_average_depth_m

    float

    Average flow depth through the inlet throat

    0.5 to 30m

  • exchange_duration_h

    floathidden in hard

    Duration of the flood or ebb exchange

    1 to 12.5h
tidal_prism_m3tol 0.03

Tidal prism volume exchanged over the tide

inlet_flow_area_m2tol 0.03

Approximate inlet flow area

mean_tidal_flow_m3_stol 0.03

Mean tidal exchange flow rate

mean_tidal_velocity_m_stol 0.03

Mean velocity through the inlet throat

visibility contract

Difficulty Ladder

all_giveneasy

All tidal prism inputs given for a small basin

all fields visible
all_givenmedium

Mixed estuary sizes and exchange durations

all fields visible
partialhard

Large basin context with exchange duration hidden

exchange_duration_h

scenario bands

Archetype Atlas

small_lagoon

2 contexts

Small lagoon entrance with modest tidal range

basin_surface_area_m210000 to 250000
tidal_range_m0.3 to 1.5
inlet_width_m5 to 40
inlet_average_depth_m0.5 to 3

coastal-lagoon / tidal-creek

estuary_inlet

2 contexts

Medium estuary with a trained or natural inlet

basin_surface_area_m2250000 to 5000000
tidal_range_m0.8 to 3
inlet_width_m30 to 250
inlet_average_depth_m2 to 12

east-coast-estuary / urban-river-mouth

large_embayment

2 contexts

Large embayment or harbour with broad exchange area

basin_surface_area_m25000000 to 50000000
tidal_range_m1 to 8
inlet_width_m150 to 1000
inlet_average_depth_m6 to 30

harbour-entrance / large-estuary

rendered task

Generation Preview

east-coast-estuary-estuary-inlet-preview

difficulty
hard
visibility
partial
archetype
estuary_inlet
site context
east-coast-estuary
instruction excerpttidal-prism_calc.py

visible fields

  • basin_surface_area_m2250000 to 5000000 m2
  • tidal_range_m0.8 to 3 m
  • inlet_width_m30 to 250 m
  • inlet_average_depth_m2 to 12 m

withheld schema

exchange_duration_htidal_prism_m3inlet_flow_area_m2mean_tidal_flow_m3_smean_tidal_velocity_m_s
Medium estuary with a trained or natural inlet. east-coast-estuary. Required outputs: tidal_prism_m3, inlet_flow_area_m2, mean_tidal_flow_m3_s, mean_tidal_velocity_m_s