tide
Let an agent handle tides with times, heights, datums and local effects, and give safety information for coasts.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent handle tides with times, heights, datums and local effects, and give safety information for coasts.
The periodic rise and fall of sea level caused mainly by the gravitational pull of the Moon and Sun and the Earth rotation, with high and low tides, spring and neap cycles, and tides in rivers and the atmosphere.
What it is for: Navigation, coastal safety, fishing, energy and ecology.
It can be predict tide times and heights; plan navigation and coastal walks; generate tidal energy; study tidal ecosystems.
Distinguishing features
Periodic, predictable
Spring and neap cycles
Heights refer to a datum
Storm surges add to tides
What it looks like
Water rising and falling on shores; exposed flats at low tide.
Physical character
tidal range: 0-16 m - Bay of Fundy near 16 m
semidiurnal period: about 12.42 hours
How it is recognised
Tide tables and gauges
Terms such as spring tide, neap tide, flood tide
Chart datum on nautical charts
Related models
is caused by - gravity
affects - coasts
combines with - flooding
is used for - resource
In practice
Families and kinds
semidiurnal, diurnal and mixed tides
spring and neap tides
river tides and bores
atmospheric and Earth tides
Identifiers
tide gauge id national or PSMSL station id observations
Standards and regulation
National hydrographic office tide tables
IHO standards for chart datums
Failure modes and hazards
People cut off by incoming tides
Wrong datum in calculations
Coastal flooding with surges
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.tide-time
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Prediction Times and heights.
Tables give predictions.
Times
High and low water.
Times
Tide times.
- When are high and low water at this place? measurement
- From which tide table? provenance
Heights
Datum.
Heights
Heights and datum.
- What heights, relative to which datum? measurement
- How do local effects change them? boundary
Cycles Spring and neap.
Cycles explain variation.
Spring and neap
Monthly cycle.
Cycle
Tidal cycle.
- Is it a spring or neap period? definition
- How large is the range? measurement
Type
Semidiurnal or diurnal.
Type
Tide type.
- What tide type occurs here? definition
- Why? definition
Safety Coastal risk.
Tides trap people.
Cut-off
Incoming tide.
Cut-off
Cut-off risk.
- Could someone be cut off by the tide here? boundary
- What should they do? action
Flooding
Surges.
Flooding
Flood risk.
- Is a storm surge expected on top of high tide? boundary
- Are warnings in force? provenance
Uses Navigation and energy.
Tides are used by people.
Navigation
Under-keel clearance.
Navigation
Navigation.
- What depth will there be at this time? measurement
- Is it safe to transit? boundary
Energy
Tidal power.
Energy
Tidal energy.
- What tidal energy potential exists here? measurement
- What are the environmental effects? boundary
What the second pass must settle
- Should tide types be separate entries?
- How should tide predictions be linked by station?
- How should safety advice be localised?