Reconstruction project of groundwater balance experiment site of Zhengzhou:mainly test equipments and data automatic acquisition

The reconstruction project of groundwater balance experiment site of Zhenzhou was rebuilded by geo-environmental monitoring institute of Henan Province，belongs to one of the national groundwater monitoring projects，which performed by China geological Environment Monitoring Institute.The development of science and technology has laid a good foundation for the automation of observation field observation data collection. The experiment field data needs to be automated collectionincluding 3m high main pole weather station test system with 3m high main pole;solar full radiation, solar net radiation,direct solar observation instrument; E-601 evaporator; 5 TM soil moisture and temperature sensor; automatic water supplying instrument; negative pressure measuring instrument. other data automation collection instrumentes have been marketized except the latter two items , which belong to the author’s invention and utility patents. The automatic water supply instrument is a device based on the traditional Mario bottle hydration principle for simulating the depth of the groundwater level. It is. It uses a control circuit to automatically replenish the amount of water consumed by evaporation as well as record the duration of precipitation. process. The negative pressure measurement utilizes the characteristic that the air kinematic viscosity is about 15 times greater than the water kinematic viscosity, that is to say, when the water just passes through the porous ceramic head, the gas cannot pass through the porous ceramic head, though which a sensor for measuring the negative pressure in the vadose zone is designed. Data acquisition based on the compensation principle of Wheatstone bridge balance. Due to the much more numberes of controlling cables for power supply and data acquisition, the data collection automation system uses a three-level integration scheme.