Which phenomenon is characterized by increased wind in a constricted channel?

• A. Venturi effect
• B. Funnel effect
• C. Headwind effect
• D. Tailwind effect

Answer: (A)

When wind is forced through a narrow passage, its speed increases while the pressure drops. This happens because the air must pass through a smaller cross-sectional area, so velocity rises to conserve mass flow; this is the Venturi effect, a direct result of fluid continuity and Bernoulli’s principle. For a kayaker, entering a constricted channel can bring stronger gusts or a noticeable push as the wind accelerates between walls or between shorelines. The other terms don’t describe this mechanism: headwind and tailwind refer to wind direction relative to you, not how the wind speeds up in a constricted flow, and the funnel effect isn’t the standard term used for this phenomenon.