Abstract
Reliable sampling technology for deep-sea sediments is a prerequisite for studying the sedimentary environment in the geological history, the mechanical characteristics of sediments and sediment biology. In this study, we develop a new sampling device in order to achieve a convenient and economic pressure sampling for hadal sediments. The overall structure, as well as the key component such as the pressure-holding part, and the sealing structure are designed. The feasibility of the device was verified through field tests. Furthermore, the sampling process is analyzed by the computer simulation. It is found that the sampling length is determined by the open diameter and the installation position of the core keepers. According to the simulation, the structure is optimized, which is beneficial to the further improvement of the sampling length.
Highlights
In the ocean, the sea area with a depth of more than 6000 m is called the hadal sea area, and the sediments in this sea area are called hadal sediments
The sedimentary environment in geological history, the mechanical characteristics of sediments, the microorganisms required by modern medicine and the changing marine environment can be understood by the analysis of the sediment [1,2]
In 1983 the Ocean Drilling Program (ODP) developed the first Pressure Core Barrel (PCB), and in the following five years, three generations of PCB were developed, with the final version of PCB III being successfully tested on the 76th voyage and successfully deployed three times on the 84th voyage, in which the gas volume was successfully measured for the first time [5]
Summary
The sea area with a depth of more than 6000 m is called the hadal sea area, and the sediments in this sea area are called hadal sediments. Amann et al developed a new autoclave coring device based on their experience with PCS during the ODP for drilling and recovering sediments containing water. Chen et al invented a gravity piston core sampler that can obtain 30 m long in-situ sediments that contain natural gas hydrate, which is an improvement of the traditional piston core sampler [14]. The study found that the ice valve is not sensitive to solid particles and rust, so the pressure sediment device based on ice valve is an effective way to improve the core rate of sediments that contain natural gas hydrate. We develop a pressure sampling device, which is of small size and light weight It has its own power source, and can be worked independently. Due to the limitations of the equipment, this device is mainly used for the sampling of soft sediments, and ensure that the pressure loss does not exceed 20%
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
