Tangalle Hummanaya blowhole: wave surge mechanics and vertical plume height factors?
What coastal geological fissure dynamics produce the 25-meter seawater spout at Hummanaya, and what swell conditions trigger maximum geyser blasts?
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3 Answers from travellers
Hummanaya at Kudawella (near Tangalle) is the only natural blowhole in Sri Lanka and the second largest in the world. It is a marine geological feature formed where ocean waves have carved a narrow subterranean sea cave through a fractured gneiss cliff leading to a vertical blowhole chimney (aperture roughly 1 meter wide). When deep southern ocean swells rush into the submerged sea cave, water and air are compressed under massive hydraulic pressure. As trapped air forces water upward through the narrow fissure, a roaring sound ("Hoo-man-na") precedes a vertical geyser plume shooting up to 25 to 30 meters.
Plume activity peaks during the Southwest Monsoon (May to September) when heavy ocean groundswells strike the southern coastline continuously.
A secured viewing platform with protective handrails stands 15 meters above the fissure; stay behind barriers to avoid sudden soaking by sea spray.
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