Carbon dioxide and abrasive cavitation jet combined hard seabed erosion system and method

The invention discloses a carbon dioxide and abrasive cavitation jet combined hard seabed erosion system and method, and relates to the technical field of deep sea bottom hard seabed erosion. The device comprises an air source supply system, a transportation system, a walking device located in the deep sea, a relay device located on the walking device, a pressurized jet fluid preparation device, a cooling fluid preparation device and a nozzle jet device. The saturated carbon dioxide solution and the dry ice abrasive are mixed and then sprayed out from a nozzle of the nozzle jet device, the pressure intensity of the saturated carbon dioxide solution is larger than that of the deep sea environment, the sprayed liquid is subjected to cavitation to generate cavitation bubbles, and the cavitation bubbles are collapsed under the condition that the pressure intensity of the seabed environment is larger than the saturated vapor pressure of carbon dioxide at the corresponding temperature. An air explosion effect is ge