lydudgange
Lydudgange is an acoustical term that originated in Nordic folklore and has been adopted in modern acoustic science to describe a specific propagation pattern of sound waves in elongated spaces. The word combines the Old Norse elements *lyd*, meaning “sound,” and *dung*, referring to a trough or conduit, with the suffix *-gange*, signifying a passage or course. In traditional Icelandic lore, lydudgange referred to the natural channels in basalt caves that carried the low‑frequency vibrations of volcanic activity or river flows to distant points, creating eerie echo phenomena.
In contemporary acoustic engineering, the concept is used to model sound transmission through long, narrow ducts
The study of lydudgange overlaps with phononic crystal research, where periodic structures create band gaps that