Tidal Guage (IMAGE) Penn State Caption A tide level gauge that has been bolstered to withstand hurricanes. Researchers have shown that sea-level rise is changing patterns of the tides in the Delaware and Chesapeake bays. Credit NOAA Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.