| 摘要: |
| 研究泉水氢氧稳定同位素时空变化特征，探究泉水的补给来源，对水资源管理及旅游业可持续发展具有重要指导意义。以百脉泉泉群为研究区，通过分析降水及泉水中的氢氧稳定同位素特征，获取了本地大气降水线、泉水同位素时空变化特征及蒸发线，并探究了百脉泉泉水的补给来源。结果表明：大气降水中δ2H的波动范围为−151.55‰—−4.28‰，δ18O的波动范围为−19.93‰—−0.52‰，δ2H和δ18O在时间上的分布规律相似，均呈现双峰状（“M”型），本地大气降水线（LMWL）为：δ2H=7.58×δ18O+4.17。百脉泉泉水的δ2H的波动范围为−65.23‰—−37.01‰，δ18O的波动范围为−8.99‰—−4.04‰。泉水δ2H—δ18O均落在本地大气降水线上或附近，泉水同位素蒸发线（LEL）为δ2H=5.75×δ18O−13.23，斜率（5.75）小于本地大气降水线斜率（7.58），表明泉水的补给来源主要为大气降水，且在入渗之前经历了较弱的蒸发作用。各泉泉水的补给区海拔均高于298 m，补给高程呈现百脉泉和东麻湾＞墨泉和梅花泉＞筛子泉和龙湾泉。且因地形、地层、岩性及降水量和持续时间等因素的制约，泉水同位素值及喷涌量的变化滞后于降水，降水至泉水喷涌时的补给周期尚需进一步结合同位素定年及水文地质条件厘定。相关研究结果将为百脉泉泉水资源合理利用及泉域旅游业的可持续发展提供借鉴。 |
| 关键词: 氢氧稳定同位素 本地大气降水线 蒸发线 补给来源 百脉泉泉群 |
| DOI：10.7515/JEE222004 |
| CSTR：32259.14.JEE222004 |
| 分类号: |
| 基金项目:山东省自然科学基金项目（ZR2019MD040）；山东省重点研发计划（2018GSF117021）；山东省高等学校青创科技支持计划（2019KJH009） |
| 英文基金项目:Natural Science Foundation of Shandong Province (ZR2019MD040); Key Research and Development Program of Shandong Province (2018GSF117021); Science and Technology Support Plan for Youth Innovation of Colleges and Universities of Shandong (2019KJH009) |
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| The spatiotemporal characteristics of hydrogen and oxygen stable isotopes of Baimai Spring Group |
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WANG Yaxuan, XIAO Bei, CUI Buli, ZANG Jingjie, YU Wanxin, ZONG Hehua
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1. The Institute for Advanced Study of Coastal Ecology, Ludong University, Yantai 264025, Chinaa
2. School of Earth Sciences and Engineering, Sun Yat-Sen University, Zhuhai 519082, Chinaa
3. Institute of Earth Environment, Chinese Academy of Sciences, Xian 710061, China
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| Abstract: |
| Background, aim, and scope Investigating the recharge source of spring water has great guidance for water resource management and sustainable development. The isotopic tracers is an effective approach for investigating complex hydrological processes of spring water. At present, the research on Baimai Spring mainly focused on the water yield and seasonal variation, and its recharge source is not clear. Therefore, this study reveals the recharge source of the spring by studying the stable isotope composition of the springs in Baimai Spring Group. The results would provide guidance for water resource management and sustainable development of tourism of the Baimai Spring Group. Materials and methods Spring water samples were collected monthly from Aug. 2017 to Jul. 2018 at 6 locations. During the sampling period, a total of 50 samples were collected. Hydrogen and oxygen stable isotope values (δ2H and δ18O, respectively) of spring water were measured using a Los Gatos Research liquid water isotope analyzer (IWA-45EP). The local meteoric water line and evaporation line of spring water were analyzed and used to investigate the recharge sources of Baimai Spring Group. Results The values of δ2H and δ18O of precipitation ranged from −151.55‰ to −4.28‰, and from −19.93‰ to −0.52‰, respectively. The LMWL was δ2H=7.58×δ18O+4.17. The δ2H of spring water in the Baimai Spring Group ranged from −65.23‰ to −37.01‰, and the δ18O ranged from −8.99‰ to −4.04‰. Most of the isotope points of spring water were present close to the LMWL; the LEL of spring water was simulated as δ2H=5.75×δ18O−13.23, where the slope of LEL (5.75) was lower than that of the LMWL (7.58). Discussion Although the monthly δ18O of each spring exhibited similar patterns, the slopes of LEL and initial isotope of each spring were different, indicating that the recharge altitudes and paths of spring water were different and complex. Considering the effect of altitude on δ18O in precipitation, the recharge altitudes of each spring water were higher than the altitude of Yiyuan County (precipitation sample site, 298 m), and the recharge altitude of spring water was in the order of Baimai and Dongmawan springs＞Moquan and Meihua springs＞Shaizi and Longwan springs. Conclusions The spring water of the Baimai Spring Group was primarily recharged by local precipitation that had undergone varying degrees of evaporation before infiltration into the ground. The recharge altitudes and paths of each spring were different and complex. Recommendations and perspectives Due to the restricts of terrain, stratum, lithology, and precipitation, the hysteresis effect of isotopes of spring water on precipitation was obvious, but the recharge period of spring water would be further determined by using isotope dating methods and hydrogeological conditions. |
| Key words: stable isotopes of hydrogen and oxygen the local meteoric water line the local evaporation line recharge
source Baimai Spring Group |
