Knowledge Resource Center for Ecological Environment in Arid Area
| 近二十年来额济纳三角洲地下水位埋深及水化学动态变化分析 | |
| 其他题名 | Study on variations of the groundwater table depth and hydro-chemical characteristics of the Ejina Delta in recent 20 years |
| 敖菲 | |
| 出版年 | 2012 |
| 学位类型 | 硕士 |
| 导师 | 于静洁 |
| 学位授予单位 | 中国科学院大学 |
| 中文摘要 | 额济纳三角洲地处极端干旱区，地下水是该地区生态环境的重要限制性因素。本文利用时间序列分析、地统计学等方法分析了额济纳三角洲地下水位埋深和地下水水化学的时空分布特征，利用线性回归分析等方法探讨了地下水动态的影响因素，\n并根据区域地下水动态特征利用ArcGIS空间分析将研究区分为8个地下水动态类型区。主要结论有：①1990-2009年间研究区地下水位平均埋深为3.41 m，西河较东河浅，北部埋深最大；地下水位埋深年际极值比为1.58，一般2-5月最小、10-12月最大。②地下水pH值呈碱性，由南向北TDS逐渐增加、地下水化学类型由NDA-NDC型向Na-Cl型转化。③生态输水实施后，除衬砌河道附近和北部绿洲区外，大部分地区地下水位抬升，地下水质改善。④地表水量增加是地下水环境恢复的根本原因，但农田地下水灌溉增加导致北部地下水位下降，河道附近地下水位不升反降。⑤随距河道距离的增大，地下水位埋深逐渐增大、变幅减小且年内最小埋深出现时间推后，对地表来水的响应滞后时间增长。⑥地下水动态可以分为8个子区域。上述研究结果可为额济纳三角洲地下水环境恢复评价和生态输水的管理和决策提供重要的参考数据，并可为合理利用和开发干旱区地下水资源提供科学指导。\n \n关键词：地下水位埋深，地下水化学组成，时空动态特征，地下水动态分区，响应关系 |
| 英文摘要 | Ejina Delta is an extremely arid region, in which the groundwater is vital to the ecological environment. \nThere are 3 issues under research in this paper: first, revealing the space-time distribution characteristics of water table depth and hydrogeological composition of groundwater in the Ejina Delta by time series analysis and geologic statistics and so on, second, analyzing the factors affecting groundwater dynamic characteristics by linear regression analysis and so on, and third, dividing the groundwater dynamic type regions by the ArcGIS space analysis.The main conclusions are:(1) The groundwater table depth is 3.41m in the area, which in the Xihe River is less than in the Donghe River and in north is more than in south in the recent 20 years. The extreme ratio year-to-year of groundwater table depth is 1.58. The groundwater table depth is minimum value during Feb. to May and is maximum value during Oct. to Dec. in a year. (2) The pH react acid. The TDS is increased and the hydrogeological type is changed from NDA-NDC to Na-Cl from south to north.(3) After the Environmental flow control, groundwater table is increased and groundwater quality is improved .(4) The groundwater table is increased by increased runoff from a river and the groundwater table is decreased by the linered watercourse and the irrigation of farm field.(5) The groundwater table depth is increased and the amplitude is decreased and the occurrence time of minimum water table depth delay when the distance from a river is increased. (6) There are 8 groundwater dynamic subzones in the area. The above researches can provide important fundamental data to evaluate the groundwater environment and to make the management strategy of environmental flow control in the Ejina Detal and can provide scientific support for rational exploitation and utilization of groundwater resources in the arid regions.\nKey words: groundwater table depth, groundwater hydro-chemical composition, space-time dynamic characteristics, groundwater dynamic subzone, response relation |
| 中文关键词 | 地下水位埋深 ; 地下水化学组成 ; 时空动态特征 ; 地下水动态分区 ; 响应关系 |
| 英文关键词 | groundwater table depth groundwater hydro-chemical composition space-time dynamic characteristics groundwater dynamic subzone response relation |
| 语种 | 中文 |
| 国家 | 中国 |
| 来源学科分类 | 自然地理学 |
| 来源机构 | 中国科学院地理科学与资源研究所 |
| 资源类型 | 学位论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/287052 |
| 推荐引用方式 GB/T 7714 | 敖菲. 近二十年来额济纳三角洲地下水位埋深及水化学动态变化分析[D]. 中国科学院大学,2012. |
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