Underwater Temperature Measurement and Variation Analysis During the Ice-covered Period in Liaodong Bay

摘要

Sea ice seriously threatens safety during the exploration and development of resources, shipping, and scientific investigations in cold regions. This study on the vertical stratification of water temperatures in seawater may provide the basis for predicting the freezing and melting processes of sea ice and guaranteeing the safety of marine activities. In the seawater temperature profile measurement system established in this study, the seawater temperature profile data measured by multiple sensors in a sea pond in the cold region of the Bohai Sea were collected through LabVIEW programming, and the real-time data were released to the Internet through the data transfer unit (DTU) module and remotely stored on the server. In this way, the real-time monitoring of the under-ice seawater temperature profile of Liaodong Bay was realized by the Internet of Things. Then the variations of seawater temperature at different depths in the observation area in different sea ice growth stages were analyzed. The overall fluctuation of water temperature at different depths was relatively flat and basically consistent with the changing trend of air temperature. The water temperature at the bottom of the sea pond varied greatly. The continuous air temperature decrease in winter led to seawater icing. Underwater temperature rose slowly as a result of heat release during the seawater icing process. These data and conclusions provide the basis for this study on the prediction methods of the freezing and melting processes of sea ice in Liaodong Bay. The seawater parameter real-time measurement technology established in this study is applicable to the real-time measurement of seawater parameters in the Bohai Sea and other ice-covered sea regions.