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在纳米比亚的Cuvelai-Etosha盆地使用稳定的同位素绘制湿季地表水过程的空间时间变化

Heike Wanke^1,2,3, Tamekeni P Nantuua², Nyambe Masiye²

¹School of Engineering, University of the West of England, Bristol, UK.

Isotopes in environmental and health studies

|September 9, 2025

概括

稳定同位素追踪了库维莱-埃托沙盆地的水,揭示了显著的蒸发损失. 收集洪水水对于减轻这些损失和改善水供应至关重要.

科学领域:

水文学的水文学
环境科学环境科学
地质化学地质化学

背景情况:

像稳定同位素 (δ18O和δ2H) 这样的自然标记物对于理解水文过程至关重要.
有效的水资源管理和洪水减缓依赖于确定水源和蒸发动态.

研究的目的:

评估稳定同位素在短暂的库维莱-埃托沙盆地 (CEB) 捕获水文模式中的实用性.
分析中等洪水 (2017) 期间的空间和时间水文变化,并将其与干旱年 (2014) 进行对比.

主要方法:

在2017年雨季收集了219个地表水样本,并在2014年5月从CEB的短暂水体收集了63个.
稳定同位素 (δ2H和δ18O) 的分析,使用离轴集成腔输出光谱仪.
对同位素数据进行比较,以确定水文模式,蒸发效应和季节性变化.

主要成果:

2017年样本的同位素分析显示, δ18O的组成范围为-13.51至12.44‰, δ2H的组成范围为-100.1至50.9‰.
一条低坡线 (δ2H = 5.19 δ18O - 13.91) 显示了主要的蒸发效应,表面水损失在3月至5月期间为24-69%.
蒸发影响在西部CEB中更为严重,并且降低的d-excess值支持观察到的蒸发损失.

结论:

稳定同位素有效地捕捉了CEB的空间和时间水文动态,突出了大量的蒸发性水损失.
蒸发导致的大量水损失减少了水的可用性,特别是在西部盆地.
建议采取主动的洪水收集策略,以减轻蒸发性损失和优化用水量,特别是考虑到季节早期的损失.

关键词:

短暂的水系统短暂的水系统纳米比亚纳米比亚纳米比亚纳米比亚一个内的 endorheic.稳定的同位素是稳定的.亚热带低地亚热带低地

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