Ocean University of China

Yonggang Jia

Xiaolei Liu

Hongxian Shan

Tao Liu

Dong Wang

Xiujun Guo

Qingsheng Meng

Minsheng Zhang

Hong Zhang

Haibo Xu

Lei Guo

Xiuqing Yang

Yongmao Zhu

Guanli Wei

Zhiming Wei

Xiaoshuai Song

Hailong Shan

Chunsheng Ji

Zhihan Fan

Lanjun Liu

Chaoqi Zhu

Jiewen Zheng

Jia Xin

Zhuangcai Tian

Shaotong Zhang

Bowen Zhang

Tian Chen

Yongzheng Quan

A device for monitoring deep-sea sediment environment in mining polymetallic nodules is provided. The monitoring system includes: acoustic Doppler flow profilers, a self-potential probe, a turbidity meter and an underwater camera. The invention can realize long-term in-situ observation of sediment disturbance, and can realize the mechanical recovery of probe rod-type equipment without large-scale mechanical devices, thereby reducing the overall weight of the recovery equipment and increasing the probability of successful equipment recovery. Compared with the existing long-term in-situ observation equipment on the seabed, it is more environmentally friendly, efficient, energy-saving and reliable.

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

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. The observation probe penetrates into the sediments following the hydraulic method.

Long-term in-situ observing device and method for deep sea bottom- supported engineering geological environment

The present invention discloses a second-generation in-situ test device for strength of a shallow water sediment, including a workboat and a static cone penetration test unit carried by the workboat, where the static cone penetration unit includes a mounting frame, a penetration unit, a control cabin and a hydraulic unit; the penetration unit and the hydraulic unit are both electrically connected to the control cabin. In this solution, the workboat is used to carry the test equipment, and the static cone penetration test unit is carried on the workboat with a special structure. Based on a double-cable lifting frame, the equipment is launched and recovered through a moon pool in the center of a hull. This significantly improves the efficiency and safety of the sediment strength test operation in a shallow water environment.

Second-generation in-situ test device for strength of shallow water sediment

The present invention discloses a system for measuring the mechanical properties of sea floor sediments at full ocean depth. The system includes an overwater monitoring unit and an underwater measurement device, where the underwater measurement device includes an observation platform and a measuring mechanism; the observation platform includes a frame-type body and a floating body, a wing panel, a floating ball cabin, a leveling mechanism, a counterweight, and a release mechanism mounted on the frame-type body; the floating ball cabin seals a circuit system; the leveling mechanism adjusts the underwater measurement device horizontally on the sea floor when the frame-type body reaches the sea floor; the release mechanism discards the counterweight for recovery of the unit after the underwater measurement device completes the underwater operation; the measuring mechanism includes at least one of a cone penetration measuring mechanism, a spherical penetration measuring mechanism, and a vane shear measuring mechanism, or a sampling mechanism.

System for measuring mechanical properties of sea floor sediments at full ocean depths

An observation system and determination method for the re-suspension quantity of submarine sediments by deep-sea internal waves. The observation system comprises a submarine observation platform, a mooring rope, and an anchor mooring counterweight. Acoustic release transponder, a single-point current meter, a turbidity meter, a high-precision temperature and salinity detector, and a sediment catcher are mounted on the submarine observation platform. A main floating body and auxiliary floating bodies are arranged on the mooring rope, wherein the main floating body is located in the middle of the mooring rope and is equipped with acoustic Doppler current profilers, and the auxiliary floating bodies are equipped with turbidity meters and high-precision temperature and salinity detectors. The anchor mooring counterweight is a gravity anchor provided with a square clamping groove and a fixed ring.

Observation system and method for re-suspension quantity of submarine sediments by deep-sea internal waves

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. Differential pressure at a position can be measured by feedback from each sensor.

Device for observing abyssal flow change based on differential pressure measurement

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Shandong, China

Yonggang Jia