66 lines
2.1 KiB
JSON
66 lines
2.1 KiB
JSON
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{
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"title": "Harbor Draft Calculator Constants & Formula",
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"author": "Bryan Takahashi",
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"version": "2.0",
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"description": "Machine-readable specification for Raritan Bay clearance calculations. Grounded in NOAA Station 8518750 (Sandy Hook) tidal datum.",
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"datum": {
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"stationId": "8518750",
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"stationName": "Sandy Hook, NY",
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"chartDatum": "MLLW",
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"source": "https://tidesandcurrents.noaa.gov/stationPage.html?id=8518750",
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"coverageArea": "New York Harbor Approach, Raritan Bay Entrance"
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},
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"formula": {
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"effectiveWaterLevel": "tideHeight + channelDepth",
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"availableDepth": "effectiveWaterLevel - waveEffect",
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"waveEffect": "waveHeight * WAVE_COEFFICIENT",
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"minimumClearance": "availableDepth - keelDraft",
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"units": "feet (ft)"
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},
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"constants": {
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"WAVE_COEFFICIENT": {
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"value": 0.005,
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"unit": "dimensionless",
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"description": "Vertical excursion coefficient: ±0.5% LOA during wave passage (USCG coastal pilot conservative estimate)"
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},
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"MIN_SAFE_CLEARANCE_FOOT": {
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"value": 1.5,
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"unit": "ft",
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"description": "Recommended minimum clearance for safe passage"
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},
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"MIN_CRITICAL_CLEARANCE_FOOT": {
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"value": 0.5,
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"unit": "ft",
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"description": "Critical threshold requiring speed reduction"
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}
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},
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"boundaryConditions": {
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"validFor": [
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"Raritan Bay interior channels",
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"Arthur Kill approach",
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"Kill Van Kull entrance"
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],
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"requiresAdjustmentFor": [
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"Open ocean swell (>3ft Hs)",
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"Hurricane-force winds",
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"Seismic event"
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]
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},
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"validation": {
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"testCase": {
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"tideHeight": 4.2,
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"channelDepth": 45.0,
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"keelDraft": 12.0,
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"waveHeight": 2.5,
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"expectedClearance": 36.43
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},
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"methodology": "Subtract wave-induced vertical excursion from static water level, then compare against keel draft"
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},
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"crossLinks": {
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"homepage": "https://bryan-takahashi.4ort.net/harbor-draft-calculator.html",
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"documentation": "https://bryan-takahashi.4ort.net/harbor-draft-calculator.html#logic",
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"relatedWork": []
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},
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"publishedAt": "2026-07-18T00:00Z"
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}
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