Undisturbed box type sampler for sediment on water surface layers

Abstract

An undisturbed box type sampler for sediment on water surface layers comprises a mud acquiring bucket, a mud acquiring bucket carrying handle, an expansion bracket, a counterweight and a traction rope. The mud acquiring bucket carrying handle consists of a carrying handle upright column and a carrying handle crossbeam, the carrying handle upright column is fixedly connected with the mud acquiring bucket, small holes are arranged on the carrying handle crossbeam, the expansion bracket comprises an expansion bracket upper plate and an expansion bracket lower plate, expansion bracket upright columns are fixedly connected with the expansion bracket upper plate and the expansion bracket lower plate and fixed onto the expansion bracket lower plate, an expansion bracket strut and the expansion bracket upright columns penetrate through the small holes on the carrying handle crossbeam, a compression spring is sleeved on the expansion bracket strut, the mud acquiring bucket is provided with a square box and two symmetric mud acquiring claws, shaft heads are disposed on two sides of the box, the mud acquiring claws are rotationally connected with the shaft heads, a tension spring is connected between the mud acquiring claws, the mud acquiring claws are connected with suspension plates, the traction rope penetrates through the expansion bracket upper plate to be connected with the carrying handle crossbeam, and the other end of the traction rope penetrates out from a hole on the counterweight. The sampler has the advantages that a sediment-water interface of acquired sediment on a surface layer is clear, layers of the sediment keep well, a sampling process is undisturbed, and the volume of the acquired sediment can be accurately computed.

Description

Technical field [0001] The invention relates to a sample collection device for surface sediments of water bodies such as rivers, lakes, reservoirs and shallow seas, in particular to a non-disturbance box sampler for surface sediments of water bodies. Background technique [0002] Rivers, lakes, reservoirs and shallow sea sediments carry a large amount of pollutants from the watershed, which are often concentrated in surface sediments; studying the physical, chemical and biological characteristics of surface sediments is one of the main contents of water environment monitoring . For example, the reconstruction of water environment by diatoms and chironomies, etc., requires the establishment of a conversion function between surface sediments such as diatoms and chironomies and modern water environment indicators, which usually relies on accurate collection of 1.0cm surface sediment samples. Surface sediments are also the main places where benthic animals live. The study of benthic...

AI Technical Summary

Problems solved by technology

The production and use of columnar sediment samplers are cumbersome and costly, and the amount of surface sediment samples collected at one time is small, often requiring multiple collections to meet the amount of sediment samples required for analysis, which increases the workload in the field

The grab sampler usually grabs and discharges the sediment samples by opening and closing two combined buckets on the left and right or multiple jaws (clamshell grab or orange segment grab), and the mechanical grab itself is not set to open and close structure, usually driven by external forces such as ropes or connecting rods, the sediment surface is disturbed during the sampling process, and the water-soil interface is unclear, which is not conducive to the collection of surface sediment with a specific thickness; Inaccurate calculation of sample volume for quantitative studies such as benthic biomass

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