Unattended dynamic frequency sediment sampling device and method

Abstract

The invention discloses an unattended dynamic frequency sediment sampling device which comprises a sampler, the sampler comprises a cylindrical body, a conductivity sensor is arranged outside the cylindrical body, a main control board is arranged in the middle of the cylindrical body, and a sediment collecting device is arranged on the periphery of the main control board; a main control chip, a sensor communication acquisition circuit and a WIFI module are embedded in the main control board, the sediment acquisition device comprises a group of sampling bottles, the bottom of each sampling bottle is provided with a three-jaw petal, and the three-jaw petals are opened and closed through traction of a motor to achieve the purpose of sediment acquisition. According to the real-time process of the conductivity of the overlying water body of the monitored river and lake sediments, the time-mean value of the conductivity in a certain time period can be measured and calculated, and the density of the sampling frequency of the river and lake sediments is automatically optimized and adjusted by taking the time-mean value and the time-varying behavior of the time-mean value as criteria, so that the sampling accuracy of the river and lake sediments is improved. The river and lake overlying water pollutant concentration change is small, sampling is little, most pollutant concentration change is sampled, the function of river and lake bottom mud sample collection and accurate matching of the overlying water quality change process is achieved, and the device has the advantages of being automatic in operation, high in efficiency and low in cost.

Description

technical field [0001] The invention relates to an unattended dynamic frequency sediment sampling device and method. Background technique [0002] Sediment is an important part of the environment of rivers and lakes, and its environmental quality is closely related to the pollution situation of the overlying water. Accurately grasping the concentration process of sediment pollutants that matches the pollution behavior of the overlying water of rivers and lakes is a scientific interpretation of the temporal and spatial differentiation of the environmental quality of river and lake sediments, and deeply reveals the multiphase migration behavior of pollutants in the sediment-overlying water system It is also an important technical support for the comprehensive pollution prevention and control of water and soil in rivers and lakes. How to accurately collect representative sediment samples with high resolution while taking into account the differences in the pollution status of ...

AI Technical Summary

Problems solved by technology

[0003] The change process of the concentration of pollutants in the overlying water of natural river and lake sediments over time is often unpredictable, and it is impossible to determine the time point of sediment sampling in advance by presetting the possible change curve of overlying water concentration. Therefore, it is difficult to collect accurately by traditional manual sampling methods. to a representative sediment sample that matches the change process of the overlying water pollution concentration

In the existing technologies, such as the invention patent with application number 200910243744.5 and the utility model patent with application number 201320495969.1, a sediment automatic sampling mode limited by sediment depth and a sampling device for collecting sediment samples as water depth changes are respectively proposed , but none of them can complete adaptive dynamic frequency sampling under the change of overlying water pollutant concentration, and it is difficult to accurately match the sediment sample collection with the change process of overlying water pollutant concentration

The invention patent with application number 202010353011.3 automatically adjusts the number of sediment sample collections according to the intensity of flow velocity changes. Although it can match the sediment samples with the hydrodynamic change process of rivers and lakes, in practical applications, for rivers and lakes with small flow velocity changes However, when the concentration of pollutants in the overlying water changes, the intensity of the change in flow velocity does not reach the control threshold level, and the sampling procedure cannot be started, so that the collected sediment samples cannot effectively capture the change behavior of the overlying water pollution, and the sediment sample cannot be realized. On the other hand, when the concentration of target pollutants in the monitored rivers and lakes remains relatively stable, the water bodies of rivers and lakes may be caused by their own turbulence or the interference of human activities such as ship operation. When the velocity of flow exceeds the control threshold, the sediment sampling program will still be activated, but the concentration of pollutants in the overlying water remains basically unchanged at this time, resulting in oversampling and a large waste of resources

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