Development of aquatic environment measurement systems of estuaries and coastal lagoons

Abstract

We have developed several new measurement systems for wide area and long-term measurement of the brackish water area (estuaries and coastal lagoons) using ultrasonic waves, optical fiber temperature sensor high-precision salinity and temperature sensors. They are (1) an underwater acoustic reflection profiling system for survey of the halocline, (2) an underwater acoustic reflection measurement system for long-term observation of halocline behavior, (3) a thermometry system using optical fiber distributed temperature sensor and (4) a CT multi-sensor temperature salinity measurement system. Long-term observations using these systems were successfully carried out in the estuaries and coastal lagoons. We are acquiring basic data for preservation and creation of the hydrosphere environment.