Multi-layer sampler for underflow layer

Abstract

The invention discloses a multi-layer sampler for an underflow layer. The multi-layer sampler comprises a conical head, an outer pipe, an inner pipe, sampling pipes, a sampling bottle, a manual air extracting device, a protective cover and a hammer. The multi-layer sampler is characterized in that the upper part of the conical head is connected with the outer pipe and the inner pipe; the sampling bottle is respectively connected with the inner pipe and the manual air extracting device through the sampling pipes; the protective cover additionally covers the top end of the outer pipe; and the protective cover is knocked by the hammer to enable the inner pipe and the outer pipe to enter the underflow layer. The sampling pipes are fixedly arranged in small groove regions (with different heights) inside the inner pipe according to a sampling requirement so as to collect water samples at different heights. During sampling, the water samples are sucked from the inner pipe to the sampling bottle under the negative pressure which is generated by extracting air in the sampling bottle by using the air extracting device. The multi-layer sampler for the underflow layer is mainly applied to the collection of underflow layer water samples of rivers, lakes and invertebrates, and is particularly applied to the layered collection of underwater underflow layer water samples.

Description

technical field [0001] The invention is applied to the collection of river and lake subsurface layer water samples and invertebrates, and is especially suitable for layered collection of underwater subsurface layer water samples. Background technique [0002] At present, the application of subsurface layer sampler is mainly seen in foreign countries, and there is no related equipment in China. Retrieving relevant research literature, the method of subsurface sampling has mainly gone through the following stages: digging pits directly at the sampling point to collect water samples flowing into the pit (Chappuis 1942); vertical pipe sampling installs a vertical pipe at the sampling point to extract water samples at a certain depth (Bou and Rouch 1967; Palmer and Strayer 1996); core sampling (Core sampling) collects soil and water samples at the sampling point together (Williams and Hynes 1974); Freeze sampling (Freeze coring) freezes the sampling area and takes it away as a wh...

AI Technical Summary

Problems solved by technology

The Bou-Rouch sampler and its improved versions (Valeria Lencioni 2008; Oana Teodora Moldovan 2011) cannot collect water samples at different depths at the same time, and are not suitable for sampling in the subsurface layer (surface water will flow into the The sampling results are affected by the inside of the pipe), and it is limited by the water content of the subsurface layer

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