👉 Groundswells are a type of wave that occur when an ocean's surface is subjected to high pressure and temperature changes. These waves can cause significant damage to coastal infrastructure, such as buildings, roads, and bridges, by traveling through the water and depositing debris or sediment. The term "groundswells" was coined in the mid-20th century by physicist and engineer, George W. Norris. He first used the term in a paper published in 1935 titled "