Effects of non-isothermal flow on groundwater recharge in a semi-arid region | Effets de l’écoulement non-isotherme sur la recharge des eaux souterraines en région semi-aride Efectos del flujo no isotérmico en la recarga de las aguas subterráneas en una región semiárida 半干旱地区非等温水流对地下水补给的影响 Efeitos do fluxo não-isotérmico na recarga de águas subterrâneas em uma região semiárida
2021
Zhang, Zaiyong | Wang, Wenke | Gong, Chengcheng | Zhao, Ming | Wang, Zhoufeng | Ma, Haizhen
Groundwater recharge is critical to water circulation in arid and semi-arid regions. The accurate determination of groundwater recharge is required for assessing water resources and effectively managing groundwater, especially in water-limited areas. Based on field experiments and numerical models in a semi-arid region, this study assessed the effect of non-isothermal flow on groundwater recharge. A lysimeter was used in the Mu Us Desert, northwestern China, to monitor groundwater recharge from 1 June to 30 September 2018. The numerical models (isothermal and non-isothermal models) were calibrated with the measured soil moisture and soil temperature. Groundwater recharge was found to take up nearly 29% of rainfall. The non-isothermal model was capable of accurately assessing groundwater recharge based on the accurate calculation of evaporation. The isothermal model, however, underestimated the groundwater recharge by 13.2% and overestimated the evaporation by 16.2%. The isothermal model overestimated evaporation during the drying process. In contrast, cumulative net recharge was underestimated after heavy rainfall events. It was therefore suggested that the non-isothermal flux should be considered in semi-arid regions, especially when assessing groundwater recharge.
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