Evaluating actual evapotranspiration and impacts of groundwater storage change in the North China Plain

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	Evaluating actual evapotranspiration and impacts of groundwater storage change in the North China Plain
	Song Xianfang; Han Dongmei
	2014
关键词	Groundwater Evapotranspiration Irrigation Meteorology Urban growth Water conservation Water supply
英文摘要	As a critical water discharge term in basin-scale water balance, accurate estimation of evapotranspiration (ET) is therefore important for sustainable water resources management. The understanding of the relationship between ET and groundwater storage change can improve our knowledge on the hydrological cycle in such regions with intensive agricultural land usage. Since the 1960s, the North China Plain (NCP) has experienced groundwater depletion because of overexploitation of groundwater for agriculture and urban development. Using meteorological data from 23 stations, the complementary relationship areal evapotranspiration model is evaluated against estimates of ET derived from regional water balance in the NCP during the period 1993-2008. The discrepancies between calculated ET and that derived by basin water balance indicate seasonal and interannual variations in model parameters. The monthly actual ET variations during the period from 1960 to 2008 are investigated by the calibrated model and then are used to derive groundwater storage change. The estimated actual ET is positively correlated with precipitation, and the general higher ET than precipitation indicates the contributions of groundwater irrigation to the total water supply. The long term decreasing trend in the actual ET can be explained by declining in precipitation, sunshine duration and wind speed. Over the past ~50years, the calculated average annual water storage change, represented by the difference between actual ET and precipitation, was approximately 36mm, or 4.8km3; and the cumulative groundwater storage depletion was approximately 1700mm, or 220km3 in the NCP. The significantly groundwater storage depletion conversely affects the seasonal and interannual variations of ET. Irrigation especially during spring cause a marked increase in seasonal ET, whereas the rapid increasing of agricultural coverage over the NCP reduces the annual ET and is the primary control factor of the strong linear relationship between actual and potential ET. 2013 John Wiley Sons, Ltd.
出处	Hydrological Processes
卷	28 期:4 页:1797-1808
收录类别	EI
语种	英语
内容类型	EI期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/31234]
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	Song Xianfang,Han Dongmei. Evaluating actual evapotranspiration and impacts of groundwater storage change in the North China Plain. 2014.