新疆焉耆盆地平原区地下水溶解性总固体时空演化

发布时间：2018-06-18 07:38

本文选题：地下水 + 污染　；参考：《农业工程学报》2016年05期

【摘要】：为研究新疆焉耆盆地平原区地下水污染现状,2014年在焉耆盆地平原区设置42个采样点,采集42组地下水样本,测定样本中溶解性总固体(total dissolved solids,TDS)及阴阳离子含量,并利用SPSS软件及MAPGIS地理信息系统分析其时空动态。结果表明,1999年与2014年地下水TDS总体存在显著差异性;对地下水中TDS与宏量阴、阳离子组分及p H值之间的关系进行分析,地下水TDS与SO42-、Cl-、K++Na+、Mg2+、Ca2+具有显著相关,相关系数在0.717~0.964之间,与宏量阴离子SO42-、Cl-相关性明显大于阳离子,相关系数分别为0.963及0.964。在时间尺度上,1983-2014年地下水TDS均值整体呈现先升高再有所降低而后又升高再降低的趋势,均值由1983年305.0 mg/L上升至1999年1773.1 mg/L后又降低至2014年589.44 mg/L;在空间尺度上,1999-2014年地下水TDS1 g/L区域面积变化呈增加的趋势,面积由1999年2 011.7 km2增加至2014年2 229.3 km2,与1999-2014年地下水TDS均值呈下降趋势相对应。研究区地下水TDS变化主要原因有2方面:一是地下水水位由2000年4.98 m下降至2014年7.34 m,地下水水位下降促使土壤及其下层沉积物中的钙、镁易溶盐、难溶盐及交换性钙镁由固相向水中转移使更多的钙镁离子进入地下水中,使地下水TDS增高,同时地下水位下降导致水中溶质浓缩也会造成TDS增高;二是生活及工业污水的排放导致大量Cl-、SO42-和部分Mg2+、Ca2+进入地下水中,造成TDS升高,这与TDS中Cl-和SO42-占主导地位相吻合。
[Abstract]:In order to study the present situation of groundwater pollution in the plain area of Yanqi Basin in Xinjiang, 42 sampling sites were set up in 2014, 42 groups of groundwater samples were collected, and the dissolved total solid dissolved solidsTDSs and anion contents in the samples were determined. SPSS software and MAPGIS GIS are used to analyze the spatial and temporal dynamics. The results showed that there was a significant difference between 1999 and 2014, and the relationship between TDs and macro anion, cationic component and pH value was analyzed, and there was a significant correlation between TDs and so _ 42-Cl-K _ (K) Na _ (mg _ (2) Ca ~ (2 +). The correlation coefficient was between 0.717 and 0.964, and the correlation with macro anions so _ 42-O _ (Cl-) was significantly higher than that with cations. The correlation coefficients were 0.963 and 0.964, respectively. On the time scale, the average TDs of groundwater increased first and then decreased and then increased and then decreased in the whole period from 1983 to 2014. The mean value increased from 305.0 mg / L in 1983 to 1773.1 mg / L in 1999, and then decreased to 589.44 mg / L in 2014. The area increased from 2 011.7 km2 in 1999 to 2 229.3 km 2 in 2014, corresponding to the decreasing trend of the average value of groundwater TDs from 1999 to 2014. There are two main reasons for the variation of TDs in the study area: first, the groundwater level decreased from 4.98 m in 2000 to 7.34 m in 2014, and the decrease of groundwater level promoted the soluble salt of calcium and magnesium in the soil and its lower sediments. The transfer of insoluble salt and exchangeable calcium and magnesium from solid phase to water causes more calcium and magnesium ions to enter groundwater, and increases TDs in groundwater. At the same time, the decrease of groundwater level leads to the increase of solute concentration in water. The second is that the discharge of domestic and industrial sewage leads to a large amount of Cl-so _ 4 _ 2- and part of mg _ 2 Ca ~ (2 +) into the groundwater, resulting in the increase of TDs, which coincides with the dominant position of Cl- and so _ 42- in TDs.
【作者单位】：新疆农业大学水利与土木工程学院;新疆水文水资源工程技术研究中心;中国地质科学院水文地质环境地质研究所;
【基金】：中国地质调查局项目(1212011220982) 新疆自治区水文学及水资源重点学科基金(XJSWSZYZDXK20101202) 新疆自治区地方公派出国留学成组配套项目(XJDF201307)
【分类号】：X523

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