Soft cloth subsealing type shallow water undisturbed surface sediment sampler

Abstract

The invention relates to a soft cloth subsealing type shallow water undisturbed surface sediment sampler comprising a sampling sleeve, a sampling mechanism and a sampling liner. The soft cloth subsealing type shallow water undisturbed surface sediment sampler is characterized in that the sampling sleeve comprises a sampling drill bit, a sampling cylinder, an outer counterweight deckle board, an upper cover plate and a hard connecting rod; the sampling mechanism comprises a lifting rope, a lifting rod, a lifting rod fixing frame, a side face connecting shaft, a side face connecting shaft baffle, a cable wire, a pulley, a slide rail of side face connecting shaft, a bottom connecting shaft, soft waterproof subsealing cloth, a spring bolt and a fixing mechanism of soft waterproof subsealing cloth; and the sampling liner comprises a sampling liner outline border, a sampling liner soleplate and a sampling liner soleplate inserting mechanism. The soft cloth subsealing type shallow water undisturbed surface sediment sampler disclosed by the invention has the advantages of large sampling area, high sampling success rate, non-damage on physical structure and sequence structure of surface sediment, and the like, and the sampler is capable of meeting collecting demand of shallow water surface sediments and is particularly suitable for collecting surface sediment samples within 3m water depth.

Description

technical field [0001] The invention belongs to the technical field of surface sediment collection in shallow waters, in particular to a soft-cloth-covered shallow waters undisturbed surface sediment sampler. Background technique [0002] Due to its loose texture and high water content, surface sediments in shallow waters are prone to erosion and resuspension under the repeated action of hydrodynamic forces. This not only has a great impact on the physical structure of the sediment, the migration and distribution of chemical substances between the water body and the sediment, but also has a certain degree of impact on the biotransformation behavior and the ecological environment characteristics of the water body. People usually use field observation and indoor simulation methods to study the change law of surface sediments in shallow waters. Due to the uncontrollable hydrodynamic conditions of field observation, the systematization and repeatability of the experimental res...

AI Technical Summary

Problems solved by technology

At present, commonly used surface sediment samplers in shallow waters include clam samplers and column samplers, which have the following disadvantages: the clam sampler will damage the physical structure and sequence structure of surface sediments during the sampling process, and The sampling success rate is low; columnar samplers usually can only collect sediments with a small area and deep depth, and when they are transferred to the simulated container, the physical structure and sequence structure of the surface sediments will also be damaged, which cannot meet the indoor requirements. Simulation experiments require large sampling area, shallow sampling depth, and undisturbed surface sediments.

[0003] Chinese patent application 200810153883.4 discloses "a pick-and-grab surface sediment sampler", although the sampler has an open / close control function, which is conducive to the smooth insertion of the sampler into the sediment and improves sampling efficiency, but the sampler is closed during the closing process. The sediment will be squeezed, and the physical structure and sequence structure of the sediment will be disturbed and destroyed.

Another example is the Chinese patent application 201210062438.3 which discloses "a box-type sampler without disturbance for surface sediments of water bodies". The sampler is improved on the basis of the clam-type sampler. The interface is clear, the sediment sequence is kept intact, and the sampling process is not disturbed. However, because the closing method is grabbing, the sampling volume of the sediment cannot be controlled, and it is easy to cause sampling failure during the sampling process. Its physical structure and sequence structure are prone to damage during transfer, which directly affects the authenticity and accuracy of simulation experiments

[0004] Chinese patent application 200810126080.X discloses a "manually rotating columnar sediment sampler", which can easily collect columnar sediment at the required depth under manual rotation operation, and can keep the sample without disturbance and The sequence is fidelity, but the process of transferring the sediment from the sampling bucket to the simulated experimental container will inevitably cause damage to the physical structure and sequence structure of the sediment, which directly affects the non-disturbance of the sample

Another example is that Chinese patent application 201110087077.3 discloses "a columnar sampling device for river sediment". Although the device is provided with a separate sampling inner tube, the sediment can be transferred while maintaining the original state, but the sampling area of ​​the columnar sampler is small. , and the collection depth is too deep, it cannot be applied to the needs of large sediment area and shallow depth in the simulation experiment

Images