Reconstruction project of Zhengzhou groundwater balance experiment site: promotion of the key application problems of experiment site monitoring data

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 is performed by China of Institute Geol-Environment Monitoring. In view of the key application problems of extending site-scale equilibrium test data to field production practice, this paper considers the combination of deterministic model (water transport equation) and stochastic model (regional vadose zone parameters). It is proposed to select 24 km² of the alluvial-producing area of the South Yellow River as a field test site to carry out regional variability study of the parameters of the vadose zone. Through limited sampling in the site, the parameter variability characteristics of vadose zone at any point in the site can be calibrated. With the help of regional meteorological data and the result of the established soil water transport mathematical model in the groundwater balance test site, the infiltration recharge of precipitation and the evaporation of phreatic water in the site are calculated, which can provide scientific basis for groundwater resource evaluation, geological environment assessment and groundwater resource sustainable development and utilization. Meanwhile, also lays a foundation for large-scale soil surface pollution assessment.