Investigation of Differential Acoustic Travel Times (DTT) in a Stratified Lake at Superkilometer Ranges

For purposes of scientific investigation and operational monitoring of lakes, we have been testing the application of Coastal Acoustic Tomography (“CAT”) to a deep subtropical lake, Lake Biwa in Japan. This article reports work on measuring nonreciprocity of transmission between transducer pairs, with a final target of assimilating into a 3D hydrodynamic model of the lake.