The 'tidal range' is the difference between:
Choose the correct answer
Mean sea level and maximum storm surge
High water level and low water level at a coastal location — spring tides give maximum range
Ocean temperature at surface and 100 m depth
Salinity at high tide vs low tide
Correct Answer
B. High water level and low water level at a coastal location — spring tides give maximum range
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Tidal range = difference between high water (HW) and low water (LW) levels at a location. Types: (1) Spring tide (Full/New Moon, Earth-Moon-Sun alignment): maximum range; (2) Neap tide (quarter Moon): minimum range. India: Kandla (Gujarat): 6–9 m (highest in India); Mumbai: ~4 m; Chennai: ~1 m. Tidal range affects: port design (access depth), coastal flooding, tidal power potential, tidal flat ecology.
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