{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.foam-line","code":"thing-q17014288","url":"https://ver.cy/models/thing/q17014288/","name":"foam line","alternateNames":[],"kind":"thing","status":"published","version":"0.2.0-wave.3","language":"en","classifiers":{"family":"Thing Registry","category":"Physical world and living systems","entryKind":"thing","plane":"PHY","domain":["PHY.FLW"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"A foam line is an elongated accumulation of foam on the surface of a freshwater body, such as a river or lake, where water movement or wind gathers bubbles formed in the presence of natural or introduced surface-active substances.","purpose":"Let an agent explain freshwater foam lines and their possible relationship to water movement, assess evidence about natural or pollution-related origins, relay reporting guidance and identify safety concerns for swimmers and boaters.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["A foam line contains accumulated foam on freshwater, rather than merely debris or other floating material.","Surface currents and wind can gather foam into lines.","Turbulence can produce foam in water containing natural or introduced surface-active substances.","Foam lines can be transient and mobile.","A foam line alone does not establish whether pollution is present."],"structure":{"bundles":[{"id":"form","name":"Form","description":"How foam lines form.","layers":[{"id":"process","name":"Process","description":"Formation.","findings":[{"id":"process-finding","name":"Process","description":"Process.","questions":[{"text":"How do convergence, surfactants and wind produce a foam line?","kind":"definition"},{"text":"Is the feature a foam line, a tide line or a wake?","kind":"boundary"}]}]},{"id":"kinds","name":"Kinds","description":"Kinds.","findings":[{"id":"kinds-finding","name":"Kinds","description":"Kinds.","questions":[{"text":"What kinds of foam lines occur at sea, in estuaries and in rivers?","kind":"definition"},{"text":"Which entry fits ocean fronts?","kind":"action"}]}]}]},{"id":"read","name":"Read","description":"What they indicate.","layers":[{"id":"currents","name":"Currents","description":"Water movement.","findings":[{"id":"currents-finding","name":"Currents","description":"Currents.","questions":[{"text":"What does a foam line tell an observer about currents, fronts and eddies?","kind":"provenance"},{"text":"Which measurements confirm the interpretation?","kind":"measurement"}]}]},{"id":"pollution","name":"Pollution","description":"Pollution signs.","findings":[{"id":"pollution-finding","name":"Pollution","description":"Pollution.","questions":[{"text":"How is natural foam distinguished from pollution, and how is suspected pollution reported?","kind":"provenance"},{"text":"Which entry fits water pollution?","kind":"action"}]}]}]},{"id":"safety","name":"Safety","description":"Safety relevance.","layers":[{"id":"swimming","name":"Swimming","description":"Swimmers.","findings":[{"id":"swimming-finding","name":"Swimming","description":"Swimming.","questions":[{"text":"Why do foam lines matter for swimmers and rescue services?","kind":"provenance"},{"text":"Is the user in a rescue situation, which needs emergency services?","kind":"boundary"}]}]},{"id":"boating","name":"Boating","description":"Boats.","findings":[{"id":"boating-finding","name":"Boating","description":"Boating.","questions":[{"text":"How do boaters read foam lines for debris and current?","kind":"provenance"},{"text":"Which entry fits navigation hazards?","kind":"action"}]}]}]},{"id":"study","name":"Study","description":"Science and observation.","layers":[{"id":"science","name":"Science","description":"Oceanography.","findings":[{"id":"science-finding","name":"Science","description":"Science.","questions":[{"text":"How do oceanographers and limnologists study foam lines and Langmuir circulation?","kind":"provenance"},{"text":"Which references are standard?","kind":"provenance"}]}]},{"id":"observe","name":"Observe","description":"Recording.","findings":[{"id":"observe-finding","name":"Observe","description":"Observe.","questions":[{"text":"How should a foam line be recorded in field observations?","kind":"action"},{"text":"Which entry fits ocean observation?","kind":"action"}]}]}]}]},"agentConduct":{"may":["Observe and map freshwater foam lines as evidence of surface water movement and possible convergence.","Report foam that may come from pollution to the water authority."],"mustNot":["Tell swimmers or boaters a freshwater foam line is safe without evidence about currents and water quality.","Assume foam is natural when it may come from pollution, or the reverse, without a test.","Guide a vessel or swimmer into hazardous freshwater currents marked by a foam line.","Disturb wildlife feeding along a foam line."],"requiresHuman":["Closing or reopening freshwater areas to swimmers because of a foam line requires human involvement."]},"ethics":{"considerations":["Freshwater foam lines can mark dangerous currents and hidden debris.","Pollution foam can harm people and wildlife while looking natural."],"affectedParties":["Swimmers and boaters may encounter freshwater foam lines.","Freshwater wildlife may be exposed to substances concentrated in foam.","Communities near rivers and lakes may be affected by pollution associated with foam."]},"owners":{"steward":"The authority or site manager responsible for the freshwater body oversees relevant safety and pollution concerns.","roles":[],"masterSystems":[]},"relations":[{"target":"Q116844065","type":"parent","note":"registry parent class"},{"target":"accumulation","type":"related","note":"a surface accumulation"},{"target":"convergence of surface currents","type":"related","note":"the process"},{"target":"sea foam","type":"related","note":"the material"},{"target":"oil slick","type":"related","note":"pollution with a different appearance"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.foam-line","Wikidata: Q17014288 (https://www.wikidata.org/wiki/Q17014288)"]},"properties":{"applicability":"required","items":["Surface length:  m - Length is estimated along the visible foam accumulation using a surveyed view or calibrated imagery.","Surface width:  m - Width is measured across the accumulation at recorded locations and times because its shape changes.","Drift speed:  m/s - Drift speed is estimated by tracking identifiable foam patches against fixed reference points over time."]},"recognition":{"applicability":"required","items":["A foam line appears as an elongated accumulation of bubbles or froth on a freshwater surface.","Debris or algae may accompany the foam but do not establish a foam line without foam.","Marine foam lines, shoreline deposits and debris-only convergence lines fall outside this freshwater sense.","A narrow streak of white or brown foam and floating debris on the water surface, often parallel to the wind or along a front."]},"capabilities":{"applicability":"required","items":["explain how foam lines form","interpret what they show about currents and fronts","distinguish natural foam from pollution indicators","relay reporting routes for suspected pollution"]},"hazards":{"applicability":"required","items":["Mistaking pollution-related foam for natural foam can lead to unsafe exposure.","Currents near freshwater foam accumulations can pose hazards to swimmers and boaters.","Foam can conceal debris and other hazards."]},"interfaces":{"applicability":"required","items":["Environmental agency guidance on reporting pollution","Bathing water quality rules"]},"context":{"applicability":"required","items":["Not for anything; a surface feature of water.","windrows or Langmuir streaks","tidal and estuarine front foam lines","river foam below weirs and rapids","shore foam lines from surf","foam from sewage or detergent pollution"]}},"sources":[{"title":"Wikidata item Q17014288: foam line","url":"https://www.wikidata.org/wiki/Q17014288","note":"identity and sense of the item"},{"title":"Wikipedia: Foam line","url":"https://en.wikipedia.org/wiki/Foam_line","note":"general description of the item"}],"openQuestions":["Should Langmuir streaks be a separate entry?","How should pollution reporting routes be linked by country?","How should foam lines be recorded in observations?"],"resources":{"spec":"/models/things/publications/thing-q17014288/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q17014288/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T19:51:39Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"filled","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-07T12:16:29+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}