强烈的人类活动推动了动态的地表水-地下水相互作用:对污染物通路的影响
Shunqing Jia1, Xihua Wang2, Y Jun Xu3
1College of Civil Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China.
Journal of contaminant hydrology
|December 12, 2025
概括
表面水和地下水的相互作用是动态的,受到人类活动的影响,特别是在农业地区. 了解这些交流是管理酸盐污染等污染物通路的关键.
科学领域:
- 环境科学 环境科学
- 水文地质学 水文地质学
- 地质化学 地质化学
背景情况:
- 表面水和地下水 (SW-GW) 相互作用对于污染物运输至关重要,但在人类压力下,在采集区规模上不太了解.
- 像柳州河流域这样的地区的密集农业显著影响了这些动态.
研究的目的:
- 为了研究SW-GW相互作用的时空模式.
- 了解污染物通路,特别是酸盐 (NO3-) 的影响.
- 评估人类季节性活动对这些交流的影响.
主要方法:
- 在不同流量时期 (低,正常,高) 进行了水地化学和同位素分析 (δ18O,δ2H).
- 采样活动于2022年11月,2023年5月和2023年8月进行.
- 使用相关性分析来确定控制充电比率的因素.
主要成果:
- 地化学和同位素数据揭示了动态的SW-GW交换过程,上下游缩表明蒸发和混合.
- 在干旱季节的地下水抽取逆转了液压梯度,导致高酸盐地下水排入河流 (高达42.5mg/LNO3−).
- 土地使用的季节性变化 (农田,森林,人口密度,赤裸的土地) 影响了充电率.
结论:
- 人类的季节性活动,如灌和城市排水,积极改变了地表水和地下水之间的污染物交换的方向和规模.
- 对SW-GW资源的综合和动态管理对于减轻农业水域污染风险至关重要.
- 这项研究提供了一个概念框架,用于理解人类压力集水区中的污染物通路.
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