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	Impacts of thickening unsaturated zone on groundwater recharge in the North China Plain
	Cao G. L.; Scanlon, B. R.; Han, D. M.; Zheng, C. M.; Zheng, D.
	2016
关键词	Groundwater recharge Soil water balance Unsaturated flow North China Plain irrigated cropland hebei plain water flow climate basin time palaeochannels resources storage
英文摘要	Unsustainable groundwater development shown by rapid groundwater depletion in the North China Plain (NCP) underscores the need to quantify spatiotemporal variability in groundwater recharge for improved management of the resource. The objective of this study was to assess spatiotemporal variability in recharge in response to thickening of the unsaturated zone in the NCP. Recharge was estimated by linking a soil water balance (SWB) model, on the basis of monthly meteorological data, irrigation applications, and soil moisture monitoring data (1993-2008), to the water table using a deep unsaturated zone flow model. The dynamic bottom boundary (water table) position was provided by the saturated zone flow component, which simulates regional pumping. The model results clearly indicate the effects of unsaturated zone thickening on both temporal distribution and magnitude of recharge: smoothing temporal variability in recharge, and increasing unsaturated storage and lag time between percolation and recharge. The thickening unsaturated zone can result in average recharge reduction of up to similar to 70% in loam soils with water table declines >= 30 m. Declining groundwater levels with irrigation sourced by groundwater converts percolation to unsaturated zone storage, averaging 14 mm equivalent water depth per year in mostly loam soil over the study period, accounting for similar to 30% of the saturated groundwater storage depletion. This study demonstrates that, in thickening unsaturated zones, modeling approaches that directly equate deep drainage with recharge will overestimate the amount and underestimate the time lag between percolation and recharge, emphasizing the importance of more realistic simulation of the continuity of unsaturated and saturated storage to provide more reliable estimates of spatiotemporal variability in recharge. (C) 2016 Elsevier B.V. All rights reserved.
出处	Journal of Hydrology
卷	537
页	260-270
收录类别	SCI
语种	英语
ISSN号	0022-1694
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/43390]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Cao G. L.,Scanlon, B. R.,Han, D. M.,et al. Impacts of thickening unsaturated zone on groundwater recharge in the North China Plain. 2016.

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