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Groundwater recharge mechanism in an integrated tableland of the Loess Plateau, northern China: insights from environmental tracers

Huang, Tianming ; Pang, Zhonghe ; Liu, Jilai ; Ma, Jinzhu ; Gates, John

Hydrogeology journal, 2017-11, Vol.25 (7), p.2049-2065 [Periódico revisado por pares]

Berlin/Heidelberg: Springer Berlin Heidelberg

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Título:
Groundwater recharge mechanism in an integrated tableland of the Loess Plateau, northern China: insights from environmental tracers
Autor: Huang, Tianming ; Pang, Zhonghe ; Liu, Jilai ; Ma, Jinzhu ; Gates, John
Assuntos: Aeration zone ; Age ; Annual precipitation ; Aquatic Pollution ; Aquifers ; Arid environments ; Arid zones ; Aridity ; Boundary conditions ; BROMINE ; CARBON 13 ; CARBON 14 ; CHINA ; CHLORIDES ; Cultures ; Deserts ; DEUTERIUM ; Earth and Environmental Science ; Earth Sciences ; ENVIRONMENT ; Environmental tracers ; Equilibrium ; Geology ; Geophysics/Geodesy ; GEOSCIENCES ; Groundwater ; Groundwater age ; GROUNDWATER RECHARGE ; Groundwater table ; History ; Hydrogeology ; Hydrology/Water Resources ; Infiltration ; LAND USE ; Loess ; MASS BALANCE ; NITROGEN OXIDES ; OXYGEN 18 ; Plateaus ; Precipitation ; Preferential flow ; Profiles ; RADIOACTIVE TRACER LOGGING ; Semi arid environments ; Semiarid environments ; Soil ; Soil profiles ; Soil properties ; SOILS ; Tracers ; TRITIUM ; Waste Water Technology ; Water Management ; Water Pollution Control ; Water Quality/Water Pollution ; Water table ; WATER TABLES
É parte de: Hydrogeology journal, 2017-11, Vol.25 (7), p.2049-2065
Descrição: Assessing groundwater recharge characteristics (recharge rate, history, mechanisms (piston and preferential flow)) and groundwater age in arid and semi-arid environments remains a difficult but important research frontier. Such assessments are particularly important when the unsaturated zone (UZ) is thick and the recharge rate is limited. This study combined evaluations of the thick UZ with those of the saturated zone and used multiple tracers, such as Cl, NO 3 , Br, 2 H, 18 O, 13 C, 3 H and 14 C, to study groundwater recharge characteristics in an integrated loess tableland in the Loess Plateau, China, where precipitation infiltration is the only recharge source for shallow groundwater. The results indicate that diffuse recharge beneath crops, as the main land use of the study area, is 55–71 mm yr −1 based on the chloride mass balance of soil profiles. The length of time required for annual precipitation to reach the water table is 160–400 yrs. The groundwater is all pre-modern water and paleowater, with corrected 14 C age ranging from 136 to 23,412 yrs. Most of the water that eventually becomes recharge originally infiltrated in July–September. The Cl and NO 3 contents in the upper UZ are considerably higher than those in the deep UZ and shallow groundwater because of recent human activities. The shallow groundwater has not been in hydraulic equilibrium with present near-surface boundary conditions. The homogeneous material of the UZ and relatively old groundwater age imply that piston flow is the dominant recharge mechanism for the shallow groundwater in the tableland.
Editor: Berlin/Heidelberg: Springer Berlin Heidelberg
Idioma: Inglês

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Groundwater recharge mechanism in an integrated tableland of the Loess Plateau, northern China: insights from environmental tracers

Huang, Tianming ; Pang, Zhonghe ; Liu, Jilai ; Ma, Jinzhu ; Gates, John

Berlin/Heidelberg: Springer Berlin Heidelberg

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