Collaborative Research: Multi-tracer Investigation of Interbasin Groundwater Transfer in the Lowland Rainforest of Costa Rica

合作研究：哥斯达黎加低地雨林跨流域地下水输送的多示踪剂调查

• 批准号: 0439732
• 负责人: David Genereux
• 金额: --
• 依托单位: North Carolina State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-05-01 至 2008-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0439732&HistoricalAwards=false
• 关键词: Collaborative; Research; Multi; tracer; Investigation

0439732GenereuxExisting data suggest interbasin groundwater flow (IGF) beneath surface topographic divides is responsible for large inputs of water and solutes to some lowland rainforest watersheds in Costa Rica. In this work age-dating tracers and trace gases will be used together with stable isotopes and major ions to test this conceptual hydrologic model for mixing of old regional groundwater (IGF) and much younger local groundwater in the watersheds. The tracers to be used are CFCs, 3H/3He, SF6, 4He, 14C, 36Cl, 18O, dissolved trace gases (Ne, Ar, Kr, N2, and O2), and major ions. Tracers will be measured in groundwater, spring water, and (for the non-volatile tracers only) streamwater, during both the wet season and dry season. The project will:1. Improve understanding of an important but understudied hydrologic process, IGF: Wherever IGF exists, quantitative knowledge of it is central to understanding the hydrology and water quality of lowland watersheds, and the status and function of those watersheds as ecosystems. 2. Test the consistency of several tracer methods through their simultaneous application to a well-posed problem on an important hydrologic process in a new setting (rain forest with volcanic geology): Testing our conceptual hydrologic model will also test the general utility of state-of-the-art tracer data in identifying and quantifying mixing between groundwaters of very different age in a complex discharge area.3. Help illustrate the practical significance of IGF for land/water management: The conceptual hydrologic model to be tested here suggests that full protection of lowland rainforest watersheds and ecosystems requires understanding a regional groundwater system whose volume, boundaries, and recharge areas are currently not known (but will be constrained by the results). Support for the model would underscore the importance of a regional approach to land and water management in the presence of IGF, and motivate further study of IGF at other sites.4. Advance education and research: The project will have strong educational/training benefits for a graduate student who will master several state-of-the-art tracer techniques. The research partners (NCSU, USGS, Univ. of Utah, and the Organization for Tropical Studies) will build collaborations that enhance their current research and training activities, make this work possible, and have the potential to carry over to future activities.

现有数据表明，地表地貌分界下的盆地间地下水流动(IGF)是哥斯达黎加一些低地热带雨林流域大量水和溶质输入的原因。在这项工作中，测年示踪剂和痕量气体将与稳定同位素和主要离子一起使用，以检验这一概念性水文模型，用于在流域中混合古老的区域地下水(IGF)和更年轻的当地地下水。示踪剂包括CFCs、~3H/~3He、SF6、~4He、~(14)C、~(36)Cl、~(18)O、溶解微量气体(Ne、Ar、Kr、N_2、O_2)和主要离子。在雨季和旱季，将在地下水、泉水和(仅用于非挥发性示踪剂的)溪水中测量示踪剂。该项目将：1.增进对一个重要但研究不足的水文过程--IGF的了解：无论IGF存在在哪里，对它的定量知识对于了解低地流域的水文和水质以及这些流域作为生态系统的地位和作用至关重要。2.通过将几种示踪剂方法同时应用于新环境(具有火山地质的热带雨林)中一个重要水文过程的适定性问题来测试几种示踪剂方法的一致性：测试我们的概念性水文模型还将测试最先进的示踪剂数据在识别和量化复杂排泄区不同年龄的地下水之间的混合方面的普遍效用。帮助说明IGF对土地/水管理的实际意义：这里将要测试的概念性水文模型表明，全面保护低地雨林流域和生态系统需要了解一个区域地下水系统，该系统的水量、边界和补给区域目前尚不清楚(但将受到结果的限制)。对该模式的支持将强调在政府间森林论坛在场的情况下对土地和水管理采取区域办法的重要性，并促使其他地点进一步研究政府间森林论坛。促进教育和研究：该项目将对掌握几种最先进的示踪技术的研究生产生巨大的教育/培训效益。研究伙伴(NCSU、USGS、Univ.(美国犹他州大学和热带研究组织)将建立合作，以加强他们目前的研究和培训活动，使这项工作成为可能，并有可能延续到未来的活动中。