Estimation of groundwater lateral flow in the southern mountainous area of the middle Heihe River Basin

The quantity of recharge of groundwater lateral flow from mountainous areas to plain areas is a long-term controversial and unresolved problem, which is always estimated to be too small or too large in arid inland basins in northwest China. Based on previous studies, this paper uses the technical methods of geological and hydrogeological investigation, geophysical exploration, drilling, pumping test, groundwater dynamic observation, hydrochemical test, basin groundwater level measurement and comprehensive study to identify the geological structure contact relationship, stratigraphic lithology contact relationship at the southern mountain-basin transition zone of the middle reaches of the Heihe River Basin, and the Cretaceous weathering crust aquifer structure and hydrogeological parameters at the Liyuan estuary. Through the analysis of the surface water and groundwater transformation relationships of different watershed levels in the mountainous areas, the recharge zones of groundwater lateral flow from the m