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基于稳定同位素数据和模型模拟的沿河湿地的水文控制
Peter H Santschi1, Chen Xu1, Peng Lin2
1Dept. of Marine and Coastal Environmental Sciences (MCES), Texas A&M University at Galveston, Galveston, TX, USA.
Isotopes in environmental and health studies
|October 21, 2024
概括
地下水和溪水的交换需要数周到一个月,而地下水的混合是一种混合型. 这项研究使用稳定同位素来追踪蒂姆斯分支流域的水相互作用.
科学领域:
- 环境科学 环境科学
- 水文学的水文学
- 地质化学 地质化学
背景情况:
- 研究地下水和地表水之间的水交换对于理解流域动态至关重要.
- 氧 (δ18O) 和 (δ2H) 的稳定同位素是水文过程中有价值的标记物.
- 沿海区域在调解地下水与流水相互作用方面发挥着重要作用.
研究的目的:
- 量化蒂姆斯分支流域地下水和溪水之间的汇率和混合模式.
- 为了确定地下水在低区的停留时间.
- 评估地下水过对溪流流量的贡献.
主要方法:
- 每月抽取雨水,溪水和地下水的样本,用于稳定同位素分析 (δ2H和δ18O).
- 测量现场参数,包括pH值和氧化降解潜力 (ORP).
- 应用质量平衡计算和水力动力学建模.
主要成果:
- 低温区的地下水需要几个星期到一个月才能完全与溪水交换.
- 水力动力学建模表明,在增加和减少的溪流段中,地下水交换量很大 (高达70%).
- 地下水过对溪流流量贡献了高达4%,河岸地下水呈现混合,而不是脉冲流,混合类型.
结论:
- 该研究证实了河岸地下水混合型混合模型,与地表水和降雨相比,同位素变异性减少.
- 一个月的时间足以使地下水变得无毒,从而形成有机物和富含铁的.
- 结果提供了对蒂姆斯分支流域水文连接和生物地化学过程的见解.
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