A floating Enteromorpha survey net and its precise quantitative method

Abstract

A floating Enteromorpha survey net and its precise quantification method, comprising stainless steel angle rings arranged at the four corners of the rectangular frame of the mesh opening; the stainless steel angle ring is connected to one end of a steel wire rope, and the other end of the steel wire rope is jointly connected to a stainless steel swivel; The upper and lower frames of the rectangular network port are made of stainless steel pipes, which are stretchable in the horizontal direction and fixed by bolts; the floats are fixed on the left and right frames; the flow meter is installed on the lower frame, and the GPS is installed on the upper frame. Logger. The advantages are: 1) The present invention can measure the relative flow velocity and flow direction by means of a flow meter, and then accurately quantify the floating Enteromorpha biomass. 2) The frame and net clothes of the marine Enteromorpha salvage net of the present invention can be disassembled, which is convenient for transportation and storage. 3) The stainless steel frame of the network port can be stretched left and right, so that the width of the network port can be adjusted, and the area of ​​the screen frame can be limited according to actual needs. 4) The net size of the mesh can not only prevent the salvaged Enteromorpha from being entangled in the mesh, so that the Enteromorpha can be concentrated at the bottom of the net, but also can effectively filter water.

Description

technical field [0001] The invention relates to the technical field of marine environment treatment, in particular to a survey net specially used for quantitatively salvaging the floating prolifera and an accurate quantitative method thereof. Background technique [0002] The algae belong to the Ulva family Ulva genus. The algae are green, or dark green, yellow-green, and have a typical single-layer cell tubular structure. Enteromorpha mainly grows on the attached substrates such as rocks in the intertidal zone, and has strong natural reproduction ability. If Prolifera prolifera grows explosively and falls off from its attachment under various factors, a green tide can be formed, which has a great negative impact on the ecological environment and economy of coastal areas. The impact of green tide on the environment is mainly manifested as: destroying the ecological balance of water bodies, affecting coastal landscapes, causing secondary ecological disasters, and destroying ...

AI Technical Summary

Problems solved by technology

[0004] The existing Enteromorpha salvage net has too large mesh, and Enteromorpha is easy to wrap around the mesh during salvage, which brings troubles and troubles to the follow-up cleaning work

Existing horizontal trawl nets used for the investigation of fish roe and larvae are too dense, which is not conducive to water filtration. The net opening is round, and the net opening fluctuates up and down during trawling, which is not conducive to accurate calculation of the swept area

The length of the existing Ashi net frame used for bottom dragging cannot be adjusted, and the occupied volume is too large, which is not conducive to transportation and storage

Existing methods for the investigation and monitoring of floating Enteromorpha biomass do not take into account the errors caused by the velocity and direction of ocean currents, making it difficult to quantify accurately

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