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An in-situ automatic monitoring method and system for vertical distribution of sediment concentration in seawater

A technology of automatic monitoring and vertical distribution, applied in the direction of material resistance, etc., can solve the problems of high time frequency, scattered data, high cost, etc., and achieve the effect of good measurement effect and guaranteed accuracy.

Inactive Publication Date: 2011-12-21
OCEAN UNIV OF CHINA
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AI Technical Summary

Problems solved by technology

The suspended sediment concentration data obtained by the filter weighing method has high accuracy, but it is time-consuming, laborious, and the data is scattered, so it can only be measured under normal sea conditions
The acoustic method can obtain the time series of the suspended sediment concentration profile in real time and continuously without disturbing the water body. The disadvantage is that the concentration is too high or too low will cause too large error
Optical instruments are easy to carry, convenient and flexible to use, relatively stable in performance, and relatively accurate and reliable in data, but their measurement range is greatly limited. For example, OBS can only measure the sediment concentration at the position of the probe, and laser sand detector can only measure Carry out the detection of low concentration point and line sediment content, and the cost is expensive
The satellite remote sensing method has a relatively good detection effect on high and low concentration sediment content. The observation period is short and the time frequency is high. It can reflect the sediment concentration distribution in a water body area from a macro perspective. Sensitive, the atmospheric correction module used in some sea areas is obviously not suitable for other sea areas, and the obtained image cannot reflect the distribution of suspended sediment concentration in the vertical direction

Method used

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  • An in-situ automatic monitoring method and system for vertical distribution of sediment concentration in seawater
  • An in-situ automatic monitoring method and system for vertical distribution of sediment concentration in seawater
  • An in-situ automatic monitoring method and system for vertical distribution of sediment concentration in seawater

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Embodiment 1

[0031] The establishment of embodiment 1 standard curve and the screening of electrode spacing

[0032] The sand taken from Shilaoren Beach in Qingdao was treated with salt washing, and dried in an electric blast dryer at 105°C. The dried sand samples were mixed with seawater from this sea area in a water tank. Form suspended sand samples with different concentrations, the seawater salinity is 31.9‰, and the resistivity probe rods with the electrode spacing of 0.5cm, 1cm, 1.5cm, and 2cm are fixed vertically in the water tank in turn, and the measurement of the conductivity value is started. At the same time, Use the suspended sediment sampler to collect suspended sand samples corresponding to a certain position of the probe rod in a 50ml suspended sand sampling tube, transfer the suspended sand samples in the centrifuge tube into a small beaker that has been weighed and dried, and put the small beaker into After drying in the oven, weigh it to get the actual sediment concentra...

Embodiment 2

[0053] Application of embodiment 2 in-situ monitoring system

[0054] The field test was carried out on the beach of Qingdao No. 1 Bathing Beach. At low tide, the entire monitoring system was fixed at the monitoring point. The resistivity probe rod with an electrode spacing of 1.5cm was vertically fixed on the tripod. When the tide rose, the probe rod began to collect data. Around 5-10cm away from the probe rod. At the same time, use the traditional six-point method to collect sand-containing water samples at relative water depths of 1.0, 0.8, 0.6, 0.4, 0.2 and 0.0m, and take them back to the laboratory to measure the suspended sediment concentration, and establish a standard curve. See examples for specific methods. 1. The salinity of this sea area is 32.1‰, and the seawater temperature is 25.1°C. During the whole measurement process, the temperature is basically kept constant. Then, the collected data is remotely transmitted to the data processing module through the centra...

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Abstract

The present invention relates to an in-situ automatic monitoring method and system for the vertical distribution of sediment concentration in seawater. The steps of the monitoring method are as follows: 1) first establish a standard curve of the corresponding relationship between suspended sediment concentration and conductivity value, 2) Then measure the resistivity value corresponding to each point in the vertical direction of the sediment concentration in seawater through the resistivity probe rod, and obtain the corresponding sediment concentration value according to the standard curve established in 1), wherein the electrode spacing of the resistivity probe rod is 1.5 cm. The system includes a power supply, a central control unit, a resistivity probe rod, a digital signal collector, a memory, GPRS and a data processing module, and is characterized in that the electrode spacing of the resistivity probe rod is 1.5 cm. The invention uses a resistivity probe rod to monitor the vertical distribution of sediment concentration in seawater. The resistivity probe rod used can perform continuous and real-time monitoring of sediment concentration under any sea conditions, and can measure the suspended sediment concentration of high and low concentrations. Both are better.

Description

technical field [0001] The invention relates to the technical field of marine measurement, in particular to an in-situ automatic monitoring method and system for the vertical distribution of sediment concentration in seawater. Background technique [0002] The distribution, diffusion, and settlement of suspended sediment affect the water quality, landform and ecological environment of the estuary coastal zone, so the study of suspended sediment concentration is of great significance to coastal engineering, port and channel construction. At present, there are many methods for measuring the concentration of suspended sediment, mainly including filter weighing method, acoustic method, optical method and satellite remote sensing method. The suspended sediment concentration data obtained by the filter weighing method has high accuracy, but it is time-consuming, laborious, and the data is scattered, so it can only be measured under normal sea conditions. The acoustic method can o...

Claims

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Application Information

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IPC IPC(8): G01N27/06
Inventor 贾永刚张颖单红仙
Owner OCEAN UNIV OF CHINA
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