干旱区生态环境知识资源中心(Arid): 额济纳盆地浅层地下水演化特征与滞留时间研究

Arid

	额济纳盆地浅层地下水演化特征与滞留时间研究
其他题名	Chemical evolution of shallow groundwater and the residence time in the Ejina Basin
	苏永红 1; 朱高峰 2; 冯起1 ; 常宗强 1; 司建华1 ; 席海洋 1; 曹生奎 1
ISSN	1000-6060
出版年	2009
卷号	32 期号:4 页码:544-551
中文摘要	以地球化学和氚(~3H)同位素测年技术相结合,通过额济纳盆地地下水、地表水地球化学及同位素的研究,探讨中国西北干旱区内陆河流域下游盆地地下水地球化学演化规律和平均滞留年龄.额济纳盆地浅层地下水状况主要受地表水补给状况的影响,离河道近的水样矿化度低;而离河道较远的戈壁区,地下水矿化度高.水体化学成分主要受岩盐、石膏、白云石等矿物的溶解及蒸发作用的影响.通过利用指数-活塞模型流模型(EPM),计算出额济纳浅层地下水年龄在13～58年之间.
英文摘要	Based on the geochemistry and tritium (~3H) dating technology,a case study of the hydrochemistry and iso-tope for the surface water and groundwater in the Ejina Basin has been taken up in order to understand the shallow groundwater residence time and geochemical evolution in the arid area of northwest China. The shallow groundwater quality is mainly controlled by the surface water. The samples near the river have low TDS values with S0_4~(2-) - Mg~(2 +) and HCO_3~- -Na~+ types,while those far from the river bed have high TDS values with SO_4~(2-)-Mg~(2+) and SO_4~(2-)-Na~++ types. From the ion-ratio plot,the rock weathering and evaporation are dominant factors that determine the major ionic composition in the study area. In addition to the dissolution of halite,the high ratio of (Na~+ + K~+ )/Cl~- indicates a significant contribution of dissolved ions from silicates weathering. Another potential source of excess Na~+ is weathe-ring of Glauber’s salt (Na_2SO_4). Gypsum in anhydrite dissolution is mainly responsible for Ca~(2+) and SO_4~(2-). Other chemical processes adding calcium is cation exchange. The high Mg~(2+)/Ca~(2+) ratio indicates that weathering of Mg-rich dolomite, which is common in the sedimentary rock in Heihe River Basin, may be involved. Most of the stable i-sotope delta~(18) and delta~2H compositions in the groundwaters are a meteoric water feature, indicating that the groundwaters mainly source from meteoric water. Whereas, the stable isotope compositions of the samples from Gurinai swamp zone deviated from the Global Meteoric Water Line (GMWL) ,and may reflect enrichment due to evaporation processes. The mean residence time of the shallow groundwater ranges from 13 to 58 years, according to the exponential-piston model (EPM). The groundwater of Gurinai swamp is oldest for 58 years and groundwater in Dingxin - Laoxinmiao is youngest for 13 years and the groundwater of around Ejina capital and Bantanjing are 22 years and 20 years, respec-tively. The results have import implications for water resource management in the Ejina Basin and other water-stressed basins in northwest China. It is suggested that long-term water usage guide should be set up for the Heihe River Basin as a whole to permit a considerable discharge to the lower Ejina Basin.
中文关键词	水化学 ; 矿化度 ; 氚(~3H)同位素测年 ; 地下水补给 ; 额济纳盆地
英文关键词	water chemistry total dissolved solid tritium dating technology groundwater recharge Ejina Basin
语种	中文
国家	中国
收录类别	CSCD
WOS类目	MINERALOGY
WOS研究方向	Mineralogy
CSCD记录号	CSCD:3583262
来源机构	中国科学院西北生态环境资源研究院
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/223560
作者单位	1.中国科学院寒区旱区环境与工程研究所,寒旱区流域水文及应用生态实验室阿拉善荒漠生态-水文试验研究站, 兰州, 甘肃 730000, 中国; 2.兰州交通大学数理与软件工程学院, 兰州, 甘肃 730070, 中国
推荐引用方式 GB/T 7714	苏永红,朱高峰,冯起,等. 额济纳盆地浅层地下水演化特征与滞留时间研究[J]. 中国科学院西北生态环境资源研究院,2009,32(4):544-551.
APA	苏永红.,朱高峰.,冯起.,常宗强.,司建华.,...&曹生奎.(2009).额济纳盆地浅层地下水演化特征与滞留时间研究.,32(4),544-551.
MLA	苏永红,et al."额济纳盆地浅层地下水演化特征与滞留时间研究".32.4(2009):544-551.