Relationship between chemical characteristics of shallow groundwater and water level depth in Ejina Oasis under water conveyance conditions
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Abstract:
The chemical characteristics and water level of shallow groundwater is an important indicator of groundwater environment change in the arid area. Under standing its temporal and spatial variations are of key significance for the sustainable development in arid ecosystems. The Ejina Oasis in the lower reaches of Heihe River of the second largest inland river basin of northwestern China was selected as the study area. Based on the shallow groundwater sampling and water chemical composition analysis data of August 2017, the historical hydro-geochemistry data ( September 2001 and August 2009) and groundwater table depth automatic monitoring data, the tempo-spatial variations of shallow groundwatercs hydro-geochemistry in Ejina Oasis and the response to groundwater depth were analy zed using the Inverse Distance Weight ( IDW ) inter polation method and the Piper graphic method. The results showed that the shallow groundwater level in the Ejina Oasis gradually decreased from southwest to northeast; however, groundwatercs TDS, in contrast, gradually increased in this direction. There was no obvious change in groundwater chemical types in 2001, 2009 and 2017, and the type of water chemistry in 2001, 2009 and 2017 were SO 4 · Cl-M g · N a, SO4 · Cl-Na · M g , SO 4 · Cl-N a · M g, respectively. The change o f TDS in groundwater was more obvious, and the highest TDS was observed in 2001, followed by 2017, while the lowest was detected in 2009. A nonlinear relationship between TDS and groundwater table depth was detected. The water table depth ranged 1.5-3 m and below 6 m, TDS did not change much with a value of approximately 2 000 mg / L ; however , at 326 m, TDS increased when the groundwater table depth was getting larger.
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