Water-sediment compound simulation test device for accurately layering and collecting sediment

Abstract

The invention relates to a water-sediment compound simulation test device which is formed by combining a testing column with a built-in layering testing cylinder, wherein an outer cylinder top cover is transparent and detachable; a sampling valve is arranged on a side face; the water replenishing and water sampling operations can be carried out conveniently; and a dewatering valve is arranged on the bottom of the side face. If the device is used for a test, an inner cylinder is taken out firstly, and then the inner cylinder is slowly descended to the outer cylinder by taking a cotton thread by hand after being filled with the acquired field sediment, an evacuation valve is closed, water is slowly filled in from the top of the outer cylinder, and then the test is started. When the sedimentsample is needed to be taken, the following operations are performed: exhausting the water of the outer cylinder by using the evacuation valve of the outer cylinder and then taking out the inner cylinder by taking the cotton thread by hand; taking off a PVC (polyvinyl chloride) short plug from one bottom corner of the inner cylinder and pulling out a PVC long nail from an inner cylinder top corner corresponding to the bottom corner by firmly holding a nail cap; inserting gaskets in layers by starting from the top layer and rotating the inner cylinder and gaskets by using the PVC long nail at another corner as a shaft; and then vertically moving the gaskets downwards, thereby guiding the sediment on the layers to fall onto the gaskets. Different layered sediment samples can be convenientlyand accurately acquired by performing the operations layer by layer.

Description

Technical field [0001] The invention relates to a set of water-sediment composite simulation test device for accurately layering and collecting sediments, which can be used for the research on nutrient conversion of lake water-sediments interface and the restoration mechanism of lake sediments in the field of environmental science and engineering. Background technique [0002] Sediment is an important part of natural water environments such as lakes, and is a reservoir of nutrients and pollutants in lakes. The lake's endogenous substances enter the water body from the sediment through the surface sediment, so the study of the migration and transformation of nutrients at the water-sediment interface is very important for the exploration of the mechanism of lake eutrophication. In simulation experiments, layered collection and analysis of sediment samples is an important prerequisite for studying the vertical characteristics of sediments. At present, most of the water-sedimen...

AI Technical Summary

Problems solved by technology

At present, most of the water-sediment simulation tests use a cylindrical plexiglass test column, the bottom of the column is filled with sediment, and then water is added to the sediment surface. The main features and problems of this device are: (1) sediment The water and water are in the same cylinder, and when the water and sediment samples are taken after the test, it will usually cause disturbance at the water-sediment interface; (2) The test column is a cylindrical structure, and after the water sample is sucked out, the cylinder is deep and the diameter is relatively small. Small, difficult to achieve layered collection of sediments

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