Characteristics of groundwater circulation in basin-mountain system of Longmenshan alluvial belt:case of Mianzhu section of Shiting River Basin
The water resources of mountainous and plain areas are closely connected,and the investigation on the mountain-basin groundwater cycle can provide a scientific basis for the development and rational utilization of water resources.The Long-menshan alluvial belt and the western Sichuan foreland basin are typical representatives of the basin-mountain system in China.Combined with the field sampling and the results of previous studies,the groundwater circulation characteristics of the basin-mountain system formed by the Longmenshan alluvial overburden and the foreland basin in the Shiting River Basin in the territory of Mianzhu section were clarified by using hydrogeological investigation,hydrochemical characterization,hydrogen and oxygen iso-topes,and cluster analysis methods.The study concludes that atmospheric precipitation is the main recharge source of shallow groundwater in the mountainous areas and plains,in which the J3l3 stratum also receives lateral recharge from the Shiting River.Topography has a dominant role in controlling the shallow groundwater runoff in the mountainous areas,which mainly occurs along the north-west and south-east directions,and has a small amount of recharge of the shallow groundwater in the near-plain are-as.The shallow layer in the plains also receives recharge from surface water and river and canal water,and the groundwater moves from northwest to southeast,finally it discharges in the form of springs along Yuquan Town to Banqiao Town.As the NW fracture structure connects with the basin-mountain system,the groundwater from the higher mountainous areas in the NW side of the study area forms a deep runoff zone along the fracture zone,forming hot water with high mineralization.The study results can be used as a reference for similar studies of mountain-basin groundwater circulation systems.
groundwater circulationhydrochemical characteristicshydrogen and oxygen isotopesbasin-mountain systemShiting River BasinLongmenshan alluvial belt
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