Application of the water table fluctuation method for estimating evapotranspiration at two phreatophyte-dominated sites under hyper-arid environments
Application of the water table fluctuation method for estimating evapotranspiration at two phreatophyte-dominated sites under hyper-arid environments
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应用地下水位波动法估算极端干旱环境下两个湿地植物为主的地区的蒸散量
DOI：
10.1016/j.jhydrol.2014.09.087
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发表时间：
2014-11
影响因子：
6.4
通讯作者：
Zhang Yichi
中科院分区：
文献类型：
--
作者：
Wang Ping;Grinevsky Sergey O.;Pozdniakov Sergey P.;Yu Jingjie;Dautova Dina S.;Min Leilei;Du Chaoyang;Zhang Yichi
在干旱和半干旱河岸系统中，浅层地下水主要通过蒸散（ETg）排出；然而，ET 的量化仍然是此类系统的区域水资源评估中的一个挑战。本研究提出了地下水蒸散过程的诊断指标以及根据季节性地下水位变化应用地下水位波动（WTF）方法估算ETg的原理。然后，这些技术被用来调查2010-2012年期间中国西北超干旱沙漠环境中两个以泥植物（柽柳和胡杨）为主的地点的地下水蒸散过程。结果表明，在生长季节，这两个地点都出现了地下水位的稳步下降，这通常归因于地下水蒸散。根据所提出的 WTF 方法，在夏季（6 月至 8 月），柽柳多枝地的估计 ETg 为 0.63–0.73 mm/d，胡杨地的 ETg 为 1.89–2.33 mm/d。使用一维根系吸水模型的数值模拟表明，两个地点的 ETga 的季节变化主要取决于潜在蒸发率。与该地区相似地点植物蒸腾作用的前期研究比较表明，这些结果是合理的。显然，WTF 方法可以提供一种简单且相对便宜的方法来估计干旱/半干旱地区的大范围ET。然而，与时间相关的侧流速率存在显着的不确定性，这在应用该方法时带来了挑战。此外，显示地下水位稳定下降的计算周期的选择可能有些主观。为了提高基于季节性地下水位下降的 WTF 方法的性能，应利用有效的地下水监测网络对侧流速率的估计进行进一步的研究。
Shallow groundwater is primarily discharged via evapotranspiration (ETg) in arid and semi-arid riparian systems; however, the quantification ofETgremains a challenge in regional water resource assessments of such systems. In this study, the diagnostic indicators of groundwater evapotranspiration processes and the principles of applying the water table fluctuation (WTF) method to estimateETgbased on seasonal groundwater level changes were presented. These techniques were then used to investigate groundwater evapotranspiration processes at two sites dominated by phreatophytes (Tamarix ramosissimaandPopulus euphratica) within hyper-arid desert environments in northwestern China for the period 2010–2012. The results indicate that steady declines in the water table, which are commonly attributed to groundwater evapotranspiration, occurred at both sites during the growing season. Based on the proposed WTF method, the estimatedETgwas 0.63–0.73 mm/d at theTamarix ramosissimasite and 1.89–2.33 mm/d at thePopulus euphraticasite during the summer months (June–August). Numerical simulations using a one-dimensional root water uptake model indicate that the seasonal variations inETgat both sites were primarily dependent on the potential evaporation rates. Comparisons with previous studies on plant transpiration at similar sites in this area show that these results are reasonable. It is apparent that the WTF method can provide a simple and relatively inexpensive method of estimatingETgon a large scale in arid/semi-arid regions. However, there are significant uncertainties associated with time-dependent lateral flow rates, which creates a challenge when applying this method. In addition, the selection of calculation periods that show steady declines in the groundwater level can be somewhat subjective. To enhance the performance of the WTF method based on seasonal water table declines, further research on the estimation of lateral flow rates should be performed using an effective network of groundwater monitoring.
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影响因子：
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作者：
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DOI：
10.1111/j.1752-1688.1996.tb03430.x
发表时间：
1996-02
影响因子：
2.4
作者：
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