Restriction of groundwater recharge and evapotranspiration due to a fluctuating water table: a study in the Ordos Plateau, China
Restriction of groundwater recharge and evapotranspiration due to a fluctuating water table: a study in the Ordos Plateau, China
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地下水位波动对地下水补给和蒸散的限制：中国鄂尔多斯高原的一项研究
DOI：
10.1007/s10040-020-02208-9
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发表时间：
2020-07
影响因子：
2.8
通讯作者：
Wan Li
中科院分区：
文献类型：
--
作者：
Zhao Ke-Yu;Jiang Xiao-Wei;Wang Xu-Sheng;Wan Li
通过观察土壤剖面中土壤含水量和地下水位波动的时间序列，可以更好地了解大气、土壤水和地下水之间的相互作用。在中国的一个站点的现场观测表明，从6月中旬到9月中旬，当蒸散量很大时，地下水不会直接补给，土壤含水量的变化在浅部的包气带主要是由大气条件控制的，但在更深的部分，它是由地下水位波动控制。为此，建立了一维变水头下边界模型，并与一维定水头下边界模型进行了比较。变水头低BC的模型再现了观测到的土壤含水量变化，结果比比较模型小得多的地下水蒸散。此外，模型与变水头下BC显示了双面阻尼的变化，从表面和底部的土壤-水通量，从而产生一个稳定的中间层，土壤-水通量的变化有限。中层有限但稳定的向上通量表明地下水的直接补给和蒸散均受到限制。因此，本研究有助于加深对干旱区大气与地下水相互作用的认识，并有助于合理选择低BC的一维饱和水流模型。
Improved understanding of interactions among the atmosphere, soil water and groundwater can be achieved by observing timeseries of soil-water content and water-table fluctuations in a soil profile. Field observations at a site in China show that from mid-June to mid-September, when evapotranspiration is strong, direct groundwater recharge does not occur, and variations in soilwater content in the shallow part of the unsaturated zone are mainly controlled by atmospheric conditions; however, in the deeper part they are controlled by the fluctuating water table. Therefore, a one-dimensional (1D) model with a variable-head lower boundary condition (BC) is built to interpret the responses of soil-water flow to changes in atmospheric and groundwater conditions, and a 1D model with a fixed-head lower BC corresponding to the mean water-table depth is built for comparison. The model with a variable-head lower BC reproduces the observed variations in soil-water content, and results in much smaller groundwater evapotranspiration than the compared model. Moreover, the model with a variable-head lower BC shows a twosided damping of variations in the soil-water flux from the surface and from the bottom, thus producing a stable middle layer with limited variation in soil-water flux. The limited but stable upward flux in the middle layer indicates restriction of both the direct recharge and evapotranspiration of groundwater. Therefore, this study enhances understanding of interactions between the atmosphere and groundwater in arid regions, and also on the appropriate selection of the lower BC of 1D variably saturated flow models.
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影响因子：
2.8
作者：
M. Bakker;J. Nieber
通讯作者：
M. Bakker;J. Nieber
干旱地区有植被和无植被的包气带的流动动力学
DOI：
10.1016/j.advwatres.2017.03.011
发表时间：
2017-08
期刊：
Advances in Water Resource
影响因子：
--
作者：
Wenke Wang;Zaiyong Zhang;Tian-chyi Jim Yeh;Gang Qiao;Wenmin Wang;Lei Duan;Shao-Yang Huang;Jet-Chau Wen
通讯作者：
Jet-Chau Wen
影响因子：
5.4
作者：
Xiaowei Jiang;L. Wan;S. Ge;G. Cao;G. Hou;F. Hu;Xu-sheng Wang;Hailong Li;S. Liang
通讯作者：
Xiaowei Jiang;L. Wan;S. Ge;G. Cao;G. Hou;F. Hu;Xu-sheng Wang;Hailong Li;S. Liang
DOI：
10.1111/j.1755-6724.2008.tb00664.x
发表时间：
2008-10
期刊：
Acta Geologica Sinica ‐ English Edition
影响因子：
--
作者：
Guangcai Hou;Yongping Liang;Xiaosi Su;Zhenghong Zhao;Zhengping Tao;Yin Li-he;Yuncheng Yang;Xiaoyong Wang
通讯作者：
Guangcai Hou;Yongping Liang;Xiaosi Su;Zhenghong Zhao;Zhengping Tao;Yin Li-he;Yuncheng Yang;Xiaoyong Wang
影响因子：
3.6
作者：
Christoph Hinz
通讯作者：
Christoph Hinz