Regional groundwater cycle patterns and renewal capacity assessment at the south edge of the Junggar Basin, China

Xiao-ying, Qiao; Wang, Wenke; Duan, Lei; Wang, Yanlin; Xiao, Ping

doi:10.1007/s12665-020-09045-9

Cited by 8 publications

(8 citation statements)

References 27 publications

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“…The study site is located in the east of Qingtu Lake, the terminal lake of the Shiyang River that originated in the southern part of the Qilian Mountain in northwest China (Figure 1a, b). The Qingtu Lake is important for preventing the merger of the two large deserts of Badain Jaran and Tengger in northwest China (Qiao et al, 2020). The climate in the area is extremely dry with a mean annual precipitation of ~110 mm and a mean annual potential evaporation of >2000 mm (Ma et al, 2008).…”

Section: Methodsmentioning

confidence: 99%

Effect of vapour transport on soil evaporation under different soil textures and water table depths in an arid area of Northwest China

Liu

Chen

Wang

et al. 2023

Hydrological Processes

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In arid area, the liquid water and water vapour states in soil profiles and fluxes at the upper and bottom interfaces are extremely complex due to heterogeneity of soil textures and the driving forces of heat and matrix potential. In this study, we used Hydrus-1D to simultaneously simulate liquid water, water vapour, and heat transport based on the observed datasets of atmosphere, soil and groundwater at three soil profiles in an arid area of northwest China. Based on the comparison of the observed and simulated results at the three soil profiles, we show that there are diurnal vapour entry and outlet fluxes at the dry surface layer of 30 cm in the summer season. The vapour entry and re-evaporation account for about 14% of annual precipitation for the heterogeneity soil profile with a mean groundwater depth of 210 cm. Because of limited soil moisture in this arid area, vapour induced re-evaporation occurs shortly in the early daytime. Moreover, the extent of vapour entry, condensation and reevaporation are strongly dependent on soil properties and water table depth. The deeper water table produces the drier soil surface, allowing more vapour entry, condensation and re-evaporation. Whereas the finer grained soil layers benefit the vapour fixation to produce zero fluxes that substantially inhibit the upward liquid water and vapour fluxes, and thereby reduces soil actual evaporation (AE). The reduced AE correspondingly decreases the capillary effect on phreatic evaporation, given that AE decreases slowly with decline of water table and the large extinct depth of phreatic evaporation for the finer grained soil profiles. The estimated extinct depths are 180 and 200 cm for the soil profiles consisting of silt loam and loamy sand, respectively, much larger than 100 cm of the typical sandy soil profile. Additionally, as water table is comparably higher and lower than the extinct depth, the models neglecting the vapourheat function could, respectively, overestimate and underestimate soil evaporation.

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Section: Methodsmentioning

confidence: 99%

Effect of vapour transport on soil evaporation under different soil textures and water table depths in an arid area of Northwest China

Liu

Chen

Wang

et al. 2023

Hydrological Processes

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“…With the slow renewal rate [15] and complex aquifer structure of groundwater, once polluted, groundwater is extremely difficult to treat and restore [16]. However, the unified monitoring and management of all kinds of detected pollutants could be a huge drain on social resources.…”

Section: Of 21mentioning

confidence: 99%

“…Moreover, the thickness of the Quaternary sediments decreases from the edge to the center. The Gurbantunggut Desert is located in the central basin, and the arid denudation high-plain (consisting of Tertiary and Paleozoic sediments) is located in the plain area on the north boundary of the Junggar Basin [15].…”

Section: Geological Conditionsmentioning

confidence: 99%

Identification and Risk Assessment of Priority Control Organic Pollutants in Groundwater in the Junggar Basin in Xinjiang, P.R. China

Zhou

et al. 2023

IJERPH

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The Junggar Basin in Xinjiang is located in the hinterland of Eurasia, where the groundwater is a significant resource and has important ecological functions. The introduction of harmful organic pollutants into groundwater from increasing human activities and rapid socioeconomic development may lead to groundwater pollution at various levels. Therefore, to develop an effective regulatory framework, establishing a list of priority control organic pollutants (PCOPs) is in urgent need. In this study, a method of ranking the priority of pollutants based on their prevalence (Pv), occurrence (O) and persistent bioaccumulative toxicity (PBT) has been developed. PvOPBT in the environment was applied in the screening of PCOPs among 34 organic pollutants and the risk assessment of screened PCOPs in groundwater in the Junggar Basin. The results show that the PCOPs in groundwater were benzo[a]pyrene, 1,2-dichloroethane, trichloromethane and DDT. Among the pollutants, benzo[a]pyrene, 1,2-dichloroethane and DDT showed high potential ecological risk, whilst trichloromethane represented low potential ecological risk. With the exception of benzo[a]pyrene, which had high potential health risks, the other screened PCOPs had low potential health risks. Unlike the scatter distribution of groundwater benzo[a]pyrene, the 1,2-dichloroethane and trichloromethane in groundwater were mainly concentrated in the central part of the southern margin and the northern margin of the Junggar Basin, while the DDT in groundwater was only distributed in Jinghe County (in the southwest) and Beitun City (in the north). Industrial and agricultural activities were the main controlling factors that affected the distribution of PCOPs.

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“…These regions are prone to water shortage due to the lack of precipitation and intense evaporation (Li 2016). Groundwater is one of the most important available water sources in these areas (Qiao et al 2020). During the past few decades, China has seen groundwater abstraction increasing by about 2.5 billion cubic meters per year to meet the needs of economic development and population growth (Li & Qian 2018).…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

In-situ pumping tests and numerical simulations of seepage wells in the Yellow River valley, China

Wang

et al. 2021

Water Supply

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Seepage wells that can convert surface water into groundwater are often constructed near the river valley to obtain more water and lead to smaller drawdown comparing with traditional wells. Seepage wells have been widely used, whilst the groundwater and river level variations caused by seepage wells are still unclear, and numerical models are rarely verified due to the lack of in-situ observation data, which may lead to the results are quite different from the actual conditions. To address those limitations, a large-scale pumping test was carried out near the Yellow River valley in China and a coupled seepage-pipe flow model was established using the exchange yield between the aquifer and pipe as the couple key in this research. The coupled model was evaluated with in-situ measurement. The field observation showed that both the river and groundwater had a positive response to the pumping of the seepage wells. The simulation results indicated that our model can well estimate the pumping rate and drawdown with root-mean-square deviations of 158.235 m3/d and 0.766 m, respectively. Further, it is also found that the groundwater showed the obvious characteristics of three-dimensional flow under the influence of seepage wells and the maximum drawdown should be less than 15 m to ensure exploitation efficiency. These findings provide important information that can guide the design and construction of seepage wells to improve the rational exploitation of groundwater.

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Regional groundwater cycle patterns and renewal capacity assessment at the south edge of the Junggar Basin, China

Cited by 8 publications

References 27 publications

Effect of vapour transport on soil evaporation under different soil textures and water table depths in an arid area of Northwest China

Effect of vapour transport on soil evaporation under different soil textures and water table depths in an arid area of Northwest China

Identification and Risk Assessment of Priority Control Organic Pollutants in Groundwater in the Junggar Basin in Xinjiang, P.R. China

In-situ pumping tests and numerical simulations of seepage wells in the Yellow River valley, China

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