喀什平原区地下水同位素年龄特征及更新速率分析
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摘要
为分析喀什平原区300 m以浅地下水年龄和更新速率,准确划分地下水流系统,采用了3H和14C放射性同位素测试方法,对采集的120组地下水样品中3H和14C同位素组成进行了分析,研究了喀什平原区不同区域地下水的年龄特征。结果表明,研究区大部分潜水氚值为12.2~39.6 TU,地下水年龄从山前冲洪积砾质平原至细土平原区逐渐增大,为10~50年;在中部库木塔格背斜隆起一带,潜水氚值小于10 TU,地下水年龄大于500年,形成地下水年龄分水岭;区内地下水14C年龄约为2 000~13 000年,反映了地下水补给时段差异较大。从山前冲洪积砾质平原上游至冲积细土平原中部地区,地下水更新速率约为2%~7%,属积极交替带;冲积细土平原中下游地区,地下水更新速率约为1%~2%,属较积极交替带;在冲积细土平原下游地区,地下水更新速率均小于1%,属弱交替带。
In order to analyze the Kashgar plain area of 300 meters in the shallow groundwater age and update rate, and the accurate division of groundwater system,3 H and14 C radioactive isotope testing methods were used to analyze 120 sets of water samples, and the characteristics of groundwater age in different areas of Kashi plain were studied in this paper.The results show that most of the phreatic tritium values in the study area are between 12.2 and 39.6 TU, and the age of groundwater increases gradually from the piedmont alluvial flood plain to the fine soil plain area, its age is between 10~50 years; In the middle of Kumtag anticline uplift area, diving tritium value is less than 10 TU, the groundwater age is more than 500 years, and Kumtag anticline uplift area is groundwater age watershed; The14 C age range in the inland water area is about 2 000~13 000 years, indicating that the recharge period of groundwater is quite different;From the alluvial plain of piedmont alluvial plain to the middle part of alluvial plain soil, the groundwater renewal rate is about 2% to7%, which is an active alternation zone; In the middle or lower reaches of alluvial plain soil, the groundwater renewal rate is about 1% to 2%, which belongs to a more active alternate zone; In the lower reaches of alluvial plain soil, the groundwater renewal rate is less than 1%,which belongs to the weak alternating zone.
In order to analyze the Kashgar plain area of 300 meters in the shallow groundwater age and update rate, and the accurate division of groundwater system,3 H and14 C radioactive isotope testing methods were used to analyze 120 sets of water samples, and the characteristics of groundwater age in different areas of Kashi plain were studied in this paper.The results show that most of the phreatic tritium values in the study area are between 12.2 and 39.6 TU, and the age of groundwater increases gradually from the piedmont alluvial flood plain to the fine soil plain area, its age is between 10~50 years; In the middle of Kumtag anticline uplift area, diving tritium value is less than 10 TU, the groundwater age is more than 500 years, and Kumtag anticline uplift area is groundwater age watershed; The14 C age range in the inland water area is about 2 000~13 000 years, indicating that the recharge period of groundwater is quite different;From the alluvial plain of piedmont alluvial plain to the middle part of alluvial plain soil, the groundwater renewal rate is about 2% to7%, which is an active alternation zone; In the middle or lower reaches of alluvial plain soil, the groundwater renewal rate is about 1% to 2%, which belongs to a more active alternate zone; In the lower reaches of alluvial plain soil, the groundwater renewal rate is less than 1%,which belongs to the weak alternating zone.
引文
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[3]热汗古丽·吾买尔,满苏尔·沙比提,陆吐布拉·依明.喀什地区近10年地下水资源时空动态变化分析[J].干旱区资源与环境,2011,25(7):63-68.
[4]王恒纯.同位素水文地质概论[M].北京:地质出版社,1991.
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(1)乃尉华,唐平辉,常志勇,等.新疆喀什经济开发区水文地质环境地质调查评价报告,2015.
[2]朱宏,周宏飞,陈小兵,等.新疆喀什地区的地下水资源特征分析[J].干旱区研究,2005,22(2):152-156.
[3]热汗古丽·吾买尔,满苏尔·沙比提,陆吐布拉·依明.喀什地区近10年地下水资源时空动态变化分析[J].干旱区资源与环境,2011,25(7):63-68.
[4]王恒纯.同位素水文地质概论[M].北京:地质出版社,1991.
[5]陈宗宇,齐继祥,张兆吉,等.北方典型盆地同位素水文地质学方法应用[M].北京:科学出版社,2010.
(1)乃尉华,唐平辉,常志勇,等.新疆喀什经济开发区水文地质环境地质调查评价报告,2015.