Device for monitoring deep-sea sediment environment in mining polymetallic nodules

A device for monitoring deep-sea sediment environment in mining polymetallic nodules, comprising:

• a monitoring system, a recovery system and a support system;
• wherein the monitoring system comprises:
• Doppler flow profilers configured to measure current profile data above the device for monitoring the deep-sea sediment environment in mining the polymetallic nodules;
• a spontaneous potential probe configured to measure a concentration of suspended solid particles in a water body below the device for monitoring the deep-sea sediment environment, a position of a seabed interface, a porosity of sediment and a redox potential;
• a turbidity meter configured to measure a turbidity of seawater at a single point to correct a test result of the spontaneous potential probe;
• and
• an underwater camera with light configured to record a real situation of the suspended solid particles in the water body;
• wherein the recovery system comprises:
• a recovery rack and two acoustic releasers;
• wherein the support system comprises a supporting frame;
• the recovery rack is provided on the supporting frame and connected with the supporting frame by an iron chain;
• wherein the iron chain passes through a bolt provided on a top of the supporting frame, and two ends of the iron chain are fixed on the acoustic releasers;
• wherein the recovery system further comprises:
• a float, a spring and a beacon;
• wherein both the float and the spring are provided on a top portion of the recovery rack;
• a height of the beacon is higher than the float;
• the spring is made of 316 stainless steel with a pulling force of 20-50 kg;
• wherein a first end of the spring is protruding to be connected with the spontaneous potential probe, and the spring is in a tensioning state;
• a second end of the spring is fixed on a horizontal rod on the recovery rack;
• the two acoustic releasers are both fixed on a middle part of the recovery rack;
• an upper part of the spontaneous potential probe is provided with grooves, and a lower part of the recovery frame corresponding to the grooves is provided with spring-tensioned snaps, which connect a cable and is connected to hooks of the acoustic releasers via a pulley.