disaster life_threatening ai_generated true

AI advises swimming parallel to the shore to escape a rip current (incorrect direction and exhaustion risk)

ID: disaster/rip-current-swim-parallel-myth

Also available as: JSON · Markdown · 中文
80%Fix Rate
85%Confidence
1Evidence
2023-06-14First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
NOAA Rip Current Safety (2023) active — — —
USLA Beach Safety (2024) active — — —

Root Cause

Rip currents are narrow, fast-moving channels that flow perpendicular to the shore; swimming parallel may keep the swimmer in the current if they are in the center, and the direction of escape depends on the current's exact location and shape.

generic

中文

离岸流是狭窄、快速流动的通道，垂直于海岸流动；如果游泳者位于离岸流中心，平行游泳可能使其保持在离岸流中，而逃生方向取决于离岸流的确切位置和形状。

Official Documentation

https://www.weather.gov/safety/ripcurrent

Workarounds

  1. 90% success If caught in a rip current, float or tread water to conserve energy. Do not panic. Signal for help by waving your arm. 
    If caught in a rip current, float or tread water to conserve energy. Do not panic. Signal for help by waving your arm.
  2. 85% success Swim parallel to the shore in the direction of the longshore current (the direction the waves are breaking), not directly against the rip current. Once out of the current, swim at an angle back to shore. 
    Swim parallel to the shore in the direction of the longshore current (the direction the waves are breaking), not directly against the rip current. Once out of the current, swim at an angle back to shore.
  3. 80% success If you cannot swim out of the current, float on your back and let the current carry you until it weakens, then swim to shore or signal for help. 
    If you cannot swim out of the current, float on your back and let the current carry you until it weakens, then swim to shore or signal for help.

中文步骤

  1. 如果被离岸流困住，漂浮或踩水以节省体力。不要惊慌。挥舞手臂求救。
  2. 沿着与海岸平行的方向游泳，方向与沿岸流（波浪破碎的方向）一致，不要直接对抗离岸流。一旦离开离岸流，以斜角游回岸边。
  3. 如果无法游出离岸流，仰面漂浮，让离岸流带你直到它减弱，然后游回岸边或求救。

Dead Ends

Common approaches that don't work:

  1. Swimming parallel to the shore in the direction of the current flow 80% fail

    If the swimmer is in the center of the rip current, swimming parallel may not exit the current; the current can be 10-50 meters wide, and the swimmer may tire before exiting

  2. Swimming parallel in the opposite direction of the current flow 70% fail

    This can push the swimmer into the current's strongest part and cause exhaustion; the direction of the rip current is not always obvious

  3. Trying to swim directly back to shore against the current 95% fail

    This is the most common fatal mistake; the rip current is stronger than the swimmer, and exhaustion leads to drowning