干旱区生态环境知识资源中心(Arid): 党河流域敦煌盆地地下水补给与演化研究

Arid

	党河流域敦煌盆地地下水补给与演化研究
其他题名	Groundwater recharge and geochemical evolution in the Dunhuang Basin of Danghe River,northwest China
	赵玮; 马金珠; 何建华
来源期刊	干旱区地理
ISSN	1000-6060
出版年	2015
卷号	38 期号:6 页码:1133-1141
中文摘要	综合应用水文地球化学指标和稳定同位素技术研究了党河流域敦煌盆地地下水补给和演化规律。岩盐、石膏及芒硝等矿物的溶解对Na~+、Ca~(2+)、Cl~-及SO_4~(2-)离子浓度影响较大。阳离子交换作用明显,地下水中Mg~(2+)和Ca~(2+)浓度增加,并与碳酸盐发生沉淀,导致HCO_3~-减少。地下水的 delta~(18)O值介于-12.1~-7.5,delta~2H值变化范围为-84.3~-61.5,指示了盆地不同地带地下水补给来源不同。潜水delta~(18)O和delta~2H数值随着地下水径流路径方自西南到东北越来越富集,反映了蒸发浓缩效应,南湖、盆地南部潜水同位素与河水相近,体现了现代补给。相比之下,承压水稳定同位素相对贫乏,指示过去寒冷时期的补给。该研究可以为敦煌区域地下水资源规划和管理提供一定的借鉴意义。
英文摘要	The groundwater supply in arid areas played a pivotal role in many fields. Firstly,it is closely related with some environmental problems such as desertification,storms and salinization. Secondly,it is a very important factor to control the economic development especially for the irrigation agriculture. The Dunhuang Basin,located in the Danghe River Basin,is facing serious groundwater problems. Additionally,tourism industry in this region is very developed but the ecological environment is rather fragile,therefore,to get an insight into the characteristics of groundwater in this region is the precondition for solving the groundwater problems. The groundwater water chemical type is a concentrated reflection of the groundwater chemical composition,and a system response of the whole water and groundwater circulation characteristics. Studies of the variation characteristics and the evolution of groundwater can better reveal the interaction mechanism of groundwater and environment. By using hydro-chemical and stable isotopic technology,this paper determined the evolution way of ground water hydro- chemical characteristics,the recharge environment of groundwater in the study area,and the physical and chemical properties of groundwater. Results show that the quality of groundwater and surface water was generally good with low salinity and unpolluted. The relationships between Na~+ and SO_4~(2-),Cl~- and Na~+,as well as Ca~(2+) and SO_4~(2-) were quite good,indicating that the dissolution of rock salt,glauber’s salt and gypsum had great influences on the concertration of Ca~(2 +),Na~+,SO_4~(2-) and Cl~-. Reverse cation exchange played an important role in the concentration of Ca~(2+) and Mg~(2+),and with the increase of Ca~(2+) and Mg~(2+) in groundwater,carbonate started to precipitation, leading to a reduction of HCO_3~-. This reaction was accelerated by the preceding hydro-geochemical evolution, especially the dissolution of the glauber’s salt. The increase of Na~+ can cause the cation exchange between Na~+ of the groundwater and Ca~(2+) or Mg~(2+) of the aquifer. For stable isotope,delta~(18)O ranged from -10.8 to -7.7, and delta~2H from -74.4 to -52.5,indicating that the recharge environment had changed significantly in the recharge history. delta~(18)O and delta~2H values in unconfined groundwater increased along the groundwater flow path from SW to NE,reflecting the effect of evaporation and concentration. The stable isotope values in Nanhu group and southern of Dunhuang Basin were close to the surface water,indicating that the surface water had an important recharge for phreatic water. In contrast,stable isotopes in confined groundwater was relatively poor,revealing that the deep confined groundwater may be supplied under a cold climate conditions in the past. The results not only have important implications for water resources allocation and groundwater management,but also can help the further study about the regional groundwater circulation characteristics in the Dunhuang Basin.
中文关键词	地下水 ; 水文地球化学 ; 稳定同位素 ; 敦煌盆地
英文关键词	groundwater hydrogeochemistry stable isotope Dunhuang 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:5584822
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/232684
作者单位	兰州大学资源环境学院, 西部环境教育部重点实验室, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	赵玮,马金珠,何建华. 党河流域敦煌盆地地下水补给与演化研究[J]. 兰州大学,2015,38(6):1133-1141.
APA	赵玮,马金珠,&何建华.(2015).党河流域敦煌盆地地下水补给与演化研究.干旱区地理,38(6),1133-1141.
MLA	赵玮,et al."党河流域敦煌盆地地下水补给与演化研究".干旱区地理 38.6(2015):1133-1141.