Abstract: A long-term in-situ observation device for the deep sea bottom supported engineering geological environment is provided, including: a sediment acoustic probe, a sediment pore water pressure probe, a three-dimensional resistivity probe, a water observation instrument, a long-term observation power supply system, a probe hydraulic penetration system, a general control and data storage transmission system, an acoustic releaser, an underwater acoustic communication apparatus, and an instrument platform. The observations include the engineering properties, physical properties, mechanical properties, and biochemical properties of a seawater-seabed interface-sediment. The engineering properties and the physical and mechanical indexes of seafloor sediments are comprehensively determined by three-dimensional measurement of seafloor resistivity and acoustic wave measurements. The physical and biochemical properties of seawater are expected to be acquired by sensors.

Abstract: A long-term in-situ observation device for the deep sea bottom supported engineering geological environment is provided, including: a sediment acoustic probe, a sediment pore water pressure probe, a three-dimensional resistivity probe, a water observation instrument, a long-term observation power supply system, a probe hydraulic penetration system, a general control and data storage transmission system, an acoustic releaser, an underwater acoustic communication apparatus, and an instrument platform. The observations include the engineering properties, physical properties, mechanical properties, and biochemical properties of a seawater-seabed interface-sediment. The engineering properties and the physical and mechanical indexes of seafloor sediments are comprehensively determined by three-dimensional measurement of seafloor resistivity and acoustic wave measurements. The physical and biochemical properties of seawater are expected to be acquired by sensors.

Abstract: A device for observing the changes in abyssal flow based on differential pressure measurement, includes differential pressure sensing chamber and base connected through communicating portion, controller provided inside communicating portion, floating body and releasing device. Floating body is located on differential pressure sensing chamber and retracted through releasing device. Sensing chamber includes ambient water pressure chamber in communication with hydrostatic pressure chamber. Communicating portion is blocked by spring sheet. The spring sheet is provided with optical fiber sensor. Hydrostatic pressure chamber is always in communication with seawater, and ambient water pressure chamber is always in communication with water in abyssal sedimentary layer. Releasing device includes electric winch provided with acoustic signal device. Base is provided with earth pressure sensor and weight member. Optical fiber sensor, acoustic signal device, and earth pressure sensor are connected with controller.