Apparatus and method for in-situ long-term observation of sediment pumped resuspension volume inside seabed

Abstract

The invention discloses a seabed internal deposit pumping re-suspension amount in-situ long-term observation device and a seabed internal deposit pumping re-suspension amount in-situ long-term observation method. The device comprises an instrument measurement working cabin, a water-conducting channel for balancing water pressure in and out of the cabin, an anti-vertical sedimentation flange and an anti-horizontal displacement supporting cylinder. Commercial instruments, such as a wave tide instrument and a turbidimeter can be carried in the device. The lower part of the instrument measurement working cabin is opened; the instrument measurement working cabin is integrally connected with the anti-horizontal displacement supporting cylinder; the anti-vertical sedimentation flange is welded to the boundary between the working cabin and the supporting cylinder; a plurality of holes are formed in the flange to reduce absorption between the flange and a soil mass after distribution, so that recovery is conveniently performed; and a lifting ring is rigidly welded to the upper part of the whole device and is used for lifting the device and fixing a positioning floating ball. The device and the method are based on frontier scientific problems and are simple and feasible in principle, and the processing cost is low; and exploration of a series of related scientific problems can be better realized if the device is combined with a conventional bottom-supported tripod observation platform which is carried with the commercial instruments, such as the wave tide instrument, the turbidimeter and a current meter to observe and compare and analyze data.

Description

Technical field [0001] The invention relates to an in-situ long-term observation device and method for pumping and resuspension of sediments in a seabed, which can observe the "pumping" phenomenon of sediments in situ on the seabed for a long time, and belongs to the field of marine engineering geology and sedimentary dynamics. Background technique [0002] The "pumping" of sediments is a phenomenon of sediment upwelling caused by seabed seepage and even liquefaction caused by the accumulation of wave-induced seabed pore water pressure. Studies have shown that the silty soil seabed will accumulate pore pressure under the action of wave load cycles, causing vertical seepage and even liquefaction of the seabed. In this process, the vertical seepage of pore water will carry the fine-particle sediments inside the seabed to be pumped up to the surface of the seabed in a form similar to "mud volcanoes", and then into the overlying water body to become resuspended substances. This mech...

AI Technical Summary

Problems solved by technology

Severe seabed erosion will lead to the exposure, suspension or even breakage of submarine umbilical cables, causing engineering accidents such as oil spills and blowouts, resulting in huge economic losses

Images