Device and method for groundwater level monitoring and automatic sampling and storage

Abstract

The invention belongs to the field of farmland hydrology and water environment, in particular to a groundwater level monitoring and automatic sampling preservation device and method. The device includes a monitoring well, an automatic water level monitoring system, a power supply system, and an automatic sampling and preservation system for water samples; the monitoring well includes an outer well (1), an inner well (2), a well cover (3) and filtering sand (4); the water level The automatic monitoring system includes a well rope (5) and a self-recording water level gauge (6); the power supply system includes an inverter (17), a battery (18), a power supply controller (19) and a solar battery board (20); a water sample The automatic sampling preservation system comprises a first water pump (8), a second water pump (7), a first water pump outlet pipe (9), a second water pump outlet pipe (10), a water outlet pipe bracket (11), a small refrigerator (12), A stepping motor (13), a circular sample card slot (14), a container bottle (15) and a programmable controller (16); the invention has a wide application range and can be used in most groundwater level water quality monitoring.

Description

technical field [0001] The invention relates to automatic monitoring and sampling of groundwater, in particular to a groundwater level monitoring and automatic sampling and preservation device and method, belonging to the fields of farmland hydrology and water environment. Background technique [0002] Groundwater is an important part of water resources, and its buried depth has an important impact on the transformation of farmland water, water consumption, and the healthy development of ecological landscapes such as forests, wasteland, and lakes. In some arid and semi-arid irrigation areas in Northwest my country, rainfall is small and evaporation is large, and the depth of groundwater and its salinity even directly determine soil salinization and the availability of groundwater resources. In addition, with the strengthening of ecological environment protection in our country, agricultural non-point source pollution has also received widespread attention. Excessive fertili...

AI Technical Summary

Problems solved by technology

[0003] Groundwater monitoring requires the monitoring of multiple elements such as water level, salinity, pH value, and nitrogen and phosphorus content. Traditional manual sampling is time-consuming and laborious. It is necessary to develop automatic monitoring and sampling technology

At present, automatic monitoring products for groundwater level and salinity have become mature and widely used, but automatic monitoring products for monitoring groundwater nitrogen and phosphorus content, pH value and other items still face problems such as inability to monitor or low monitoring accuracy, and high monitoring costs. , in order to realize the monitoring of nitrogen and phosphorus content in groundwater, it is also necessary to collect water samples

Various existing groundwater monitoring and sampling devices, such as Chinese patents "A kind of farmland shallow groundwater level, water quality on-line monitoring and automatic sampling system (CN201721246244)", "A kind of groundwater automatic monitoring equipment (CN201610532852)" although using various sensors It partially solves the problem of water quality monitoring, and can also conduct a single sampling of groundwater. However, in actual regional scale groundwater monitoring, a large number of sampling points are often required, and most of them only need water quality monitoring data at a certain interval (such as 7d, 10d). Since each sensor can only monitor a single item, relying heavily on sensors will not only lead to incomplete monitoring of water quality elements, but also greatly increase monitoring costs

Although the existing automatic sampling technology can achieve a single sampling, it can neither meet the requirements of long-term automatic sampling and the refrigerated storage of samples such as nitrogen, phosphorus content, and salinity at 4°C, nor does it take into account the hysteresis exchange between the groundwater in the observation well and the actual groundwater. question

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