基于昼夜水位波动法估算地下水蒸散发量的研究——以河西走廊典型绿洲为例

doi:10.13866/j.azr.2021.01.07

Abstract

Abstract:

Daily groundwater evapotranspiration (ET_g) was estimated for the shallow groundwater area of the new oasis in the middle reaches of the Heihe River basin using diurnal water level fluctuation methods （White, Hays, Loheide）. The results were compared with the potential evapotranspiration (PET) estimated using Penman method, water surface evaporation (ET₀) measured using E-601 pan, and water surface evaporation (ET₁) measured using Φ₂₀, and the differences between ET_g and PET (ET₀ and ET₁) were analyzed using Pearson correlation coefficient. The results showed that among these calculation methods, Hays method performed the best with the highest accuracy, followed by the White method, and the Loheide method performed the worst with the lowest accuracy. Therefore, Hays method is recommended for estimation of daily ET_g and ET₀ is recommended for testing the estimation accuracy. Loheide method showed high ET_g accuracy (R=0.821, P<0.01) with approximate 3 hr time lag, which was also found in other areas of the Heihe River basin (old oasis, desert edge, shelterbelt). The results obtained in this study will be helpful and may offer scientific support for rational allocation, sustainable development, and utilization of regional water resources in the Heihe River basin.

Key words: desert oasis, groundwater level, diurnal groundwater variation, groundwater recharge

WANG Jingjing,LIU Hu,XU Zongxue,WANG Sijia. Estimation of groundwater evapotranspiration with measured diurnal groundwater variations: A case study of typical oasis in Hexi Corridor[J].Arid Zone Research, 2021, 38(1): 59-67.

Figures/Tables 11

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References 30

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特征值	饱和含水量	田间持水量	凋萎湿度	给水度	速效给水度
土壤水势	0	1/3 bar	15 bar
VWC	0.352	0.346	0.267	0.085	0.043

	PET	ET₀	ET₁
White	0.761^*	0.792^*	0.739^*
Loheide	-0.105	0.005	0.001
Hays	0.843^**	0.897^**	0.872^**

样点	L	P	Q	T
时间	08-10—08-18	06-24—06-30	07-06—07-11	07-10—07-17
无时滞	0.463^**	0.380^**	0.549^**	0.587^**
时滞1 h	0.649^**	0.585^**	0.690^**	0.738^**
时滞2 h	0.772^**	0.722^**	0.784^**	0.825^**
时滞3 h	0.821^**	0.783^**	0.822^**	0.833^**
时滞4 h	0.795^**	0.785^**	0.771^**	0.757^**
时滞5 h	0.702^**	0.714^**	0.650^**	0.616^**
时滞6 h	0.563^**	0.593^**	0.459^**	0.437^**

Estimation of groundwater evapotranspiration with measured diurnal groundwater variations: A case study of typical oasis in Hexi Corridor

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