输水条件下额济纳绿洲浅层地下水水化学特征与水位埋深关系研究
The relationship between chemical characteristics of shallow groundwater and water level depth in Ejina Oasis under water conveyance conditions
投稿时间:2019-04-30  修订日期:2019-05-26
DOI:
中文关键词:  水化学特征  地下水  额济纳绿洲  干旱区
英文关键词:hydro-geochemical characteristics  groundwater  Ejina Oasis  arid area
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位E-mail
张学静 中国科学院地理科学与资源研究所 zhangxj.17s@igsnrr.ac.cn 
王平 中国科学院地理科学与资源研究所 wangping@igsnrr.ac.cn 
王田野 中国科学院地理科学与资源研究所  
于静洁 中国科学院地理科学与资源研究所  
刘啸 水利部发展研究中心  
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中文摘要:
      浅层地下水水化学特征及水位埋深是干旱区地下水环境变化的重要指示,研究其时空变化对干旱区绿洲生态环境修复及其可持续发展具有重要意义。本文以我国西北干旱区第二大内陆河——黑河下游额济纳绿洲为研究区,以2017年8月水化学组分分析数据为基础,结合水化学历史分析数据(2001年9月和2009年8月)及地下水位埋深自动监测数据,运用反距离权重(IDW)插值方法和水化学Piper图解法,分析了生态输水以来(2001-2017年)额济纳绿洲地下水水化学特征和水位埋深的时空变化特征及两者间的响应关系。结果表明,在空间上,地下水位从西南到东北逐渐降低,地下水总溶解固体(TDS)沿着地下水流向呈增加趋势。2001至2017年地下水化学类型变化不明显,分别呈SO4˙Cl—Mg˙Na,SO4˙Cl—Na˙Mg,SO4˙Cl—Na˙Mg;地下水中TDS变化较为明显,即在2001年最高,2017年次之,2009年最低。TDS与地下水位埋深之间呈非线性统计关系,具体表现为:水位埋深在1.5~3 m及6 m以下范围内,TDS变化不大,稳定维持在2000 mg/L左右;但在3~6 m范围内,TDS随地下水位埋深增大呈一定的增加趋势。
英文摘要:
      The chemical characteristics and water level of shallow groundwater is an important indicator of groundwater environment change in arid area. Understanding its temporal and spatial changes is of decisive significance for the sustainable development in arid ecosystems. The Ejina Oasis in the lower reaches of the Heihe River, 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 carried out in August 2017, and also the historical hydro-geochemistry data (September 2001 and August 2009) and groundwater table depth automatic monitoring data, the tempo-spatial variations of shallow groundwater’s hydro-geochemistry in Ejina Oasis and the response to groundwater depth were analyzed using the Inverse Distance Weight (IDW) interpolation 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, groundwater’s TDS, in contrast, gradually increased in this direction. There was no obvious change in groundwater chemical types between 2001 and 2017, and the type of water chemistry in 2001, 2009 and 2017 were SO4˙Cl—Mg˙Na,SO4˙Cl—Na˙Mg,SO4˙Cl—Na˙Mg, respectively. TDS in groundwater changed obviously, and the highest TDS was observed in 2001, followed by the 2017, and the lowest can be detected in 2009. A nonlinear relationship between TDS and groundwater table depth was detected. For the water table depth ranging with 1.5~3 m and below 6 m, the TDS does not change much with a value of approximately 2000 mg/L; however, in the range of 3~6 m in groundwater depth, the TDS increases when the groundwater table depth is getting larger.
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