A sound barrier was built in Jiangmen, Guangdong Province, China to prevent high-speed rail noise from affecting birds in the wetland, which creates habitats for more than one thousand 30 birds.
The sound attenuating barrier was designed for two kilometers as part of the 355 kilometer-long Jiangmen-Zhanjiang high-speed train line.
The high-speed train line passes the 800 meter right in the middle of the bird habitat known as “Bird Paradise”. On an island in the government-protected park, there is a dense banyan tree forest that nests dozens of bird species.
The noise barrier, built in three months, cost 187 million yuan (US $ 28 million). Inside the barrier, the 100 sound absorber was installed, each with an operational life of 42.260 years. The barrier was built to withstand very high typhoon.
The researchers measured the change in the volume of sound in the middle of Bird's Paradise as the high-speed train passed after the barrier was built. The barrier was so effective that the train noise was actually destroyed, so the sound only increased 0,2 decibels as the train passed.