Chinese scientists have created the first systematic “acoustic profile” of the spectacular Qiantang River tidal bore in Zhejiang Province, recording the powerful natural phenomenon in high-fidelity sound.
Researchers collected more than 10 audio samples of typical one-line tidal bores during the 2025-26 high tide season at a monitoring station in Haining Jiaxing. The loudest bore recorded reached 78.04 decibels, roughly comparable to the noise level of a busy urban road.
The study aims to improve understanding of the tidal bore’s dynamics while supporting tidal safety, ecological conservation, cultural tourism and public education.
Scientists also identified a new visual formation at the Jianshan section where three streams of tidal water reportedly crossed to form a triangular pattern before evolving into a butterfly shaped tide. Researchers have dubbed the phenomenon “three tides transforming into a butterfly.”
The Qiantang River tidal bore is considered one of the world’s three major tidal bores, alongside the Amazon tidal bore in Brazil and the Ganges tidal bore in India. Its annual viewing season attracts large crowds particularly around the Mid Autumn Festival.
The tradition of watching the Qiantang tidal bore dates back more than 2,000 years. Authorities in Hangzhou are also exploring the potential of the Qiantang River Tidal Culture Landscape for World Heritage recognition.