Sediment Pore Water Sampling Device with In-Situ Analysis
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Solution Overview
Problem
Current sediment pore water sampling and analysis devices face significant errors due to temperature and pressure changes during transportation and are limited to instantaneous data collection, lacking the capability for long-term, in-situ sampling and storage.
Innovation Solution
A long-term in-situ sampling and analysis device comprising a bracket, probe, elevator, diverting device, water storage devices, peristaltic pump, dissolved gas analysis device, and environment measurement device, with a central control system for controlled extraction and storage of sediment pore water, enabling continuous collection and in-situ analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sediment samples are collected by gravity sampler and transported to laboratory for pore water extraction, then sediment pore water can be obtained for analysis, but temperature and pressure changes during transportation cause gas escaping and constituent oxidating leading to significant measuring error
Solution Approach 1:
The patent performs pore water extraction and analysis directly at the seabed location before the sediment sample is transported to the laboratory. The extraction device includes a probe that penetrates the sediment, a squeezing chamber that applies pressure to extract pore water, and integrated analysis instruments that measure geochemical characteristics in-situ. This preliminary action eliminates the transportation phase entirely, preventing temperature and pressure changes from causing gas escaping or constituent oxidating.
Solution Approach 2:
The patent introduces an intermediary squeezing chamber and pressure control system between the sediment sample and the analysis instruments. The squeezing chamber applies controlled pressure to extract pore water while maintaining stable temperature and pressure conditions, acting as a mediator that prevents harmful changes during the extraction process. The pressure control system includes a pressure source and pressure sensor to maintain constant pressure conditions.
2Duration of action of moving object
If present in-situ sediment pore water extraction devices are used, then sediment pore water can be collected, but only instantaneous data from a certain period can be acquired, unable to collect and store in-situ, long-term and time-phased sediment pore water
Solution Approach 1:
The patent segments the water storage capability into multiple detachable water storage bottles that can be individually filled and replaced. The device includes a plurality of water storage bottles arranged in the water storage chamber, allowing the system to collect pore water over extended periods by sequentially filling different bottles. This segmentation enables long-term collection while maintaining manageable volumes in each storage unit.
Solution Approach 2:
The patent implements a system where filled water storage bottles are discarded (removed from the device) and empty bottles are recovered (inserted into the device) during operational periods. The control system manages the replacement of water storage bottles, allowing continuous long-term collection by periodically exchanging full bottles for empty ones, thus extending the total collection duration beyond what a single bottle capacity would allow.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device allows for continuous, long-term collection and pressure-keeping storage of sediment pore water for laboratory analysis, providing accurate geochemical data and rapid in-situ gas content analysis, with data transmission to the surface through hydroacoustic communication.
Implementation Method 1
a peristaltic pump (7), wherein the peristaltic pump (7) is respectively connected to the second water storage device (6) and the diverting device (4) through a flexible connecting member
Data Source
AI summary
The present application discloses a long-term, in-situ sampling and analysis device for sediment pore water and a method thereof. The long-term in-situ sampling and analysis device for sediment pore water includes a bracket, a probe, an elevator, a diverting device, a first water storage device, and a second water storage device, a peristaltic pump, a dissolved gas of sediment pore water analysis device and an in-situ environment measurement device. The present application can collect and store the sediment pore water in an in-situ, long-term and time-phased manner, and in low measuring error level.