Curvas de flujo con múltiples picos en ríos kársticos: efectos de un sistema de difluencia-confluencia

IF 2.4 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Romain Deleu, Amaël Poulain, Gaëtan Rochez, Sandra Soares-Frazao, Guy Van Rentergem, Eli De Poorter, Vincent Hallet
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引用次数: 0

Abstract

Abstract In karstic environments, it is not unusual for an underground river to split into two or more streams (diffluence) and merge back together downstream (confluence). This kind of behavior can generate multipeaked breakthrough curves (BTCs) in dye tracing at a sampling site located downstream of the confluence(s). It is also possible that such a phenomenon is difficult to highlight with dye tracing if the tracer clouds coming from the different streams reach the sampling locations at the same time. In this study, an attempt at quantifying the importance of different criteria in the occurrence of a multipeaked BTC is done by performing a dye tracing campaign in a two-tributaries diffluence-confluence (DC) system and using a one-dimensional solute transport model. The results from both field data and the solute transport model suggest that a double-peaked BTC occurs downstream of a DC system if the following conditions are met: (1) the injection is done close enough to the diffluence, (2) the sampling point is located not too far from the confluence, and (3) the two (or more) streams have sufficiently contrasted travel times from the diffluence to the confluence. The paper illustrates that, even if a diffluence occurs in a karstic river, multipeaked BTCs are not necessarily observed downstream of the confluence if these three conditions are not met. Therefore, characterizing a DC system using dye tracing is a real challenge. This could explain why publications that report studies involving multipeaked BTCs are quite rare.

Abstract Image

喀斯特河流多峰流动曲线:差异-汇流系统的影响
在岩溶环境中,地下河分裂成两条或两条以上的溪流(扩散)并在下游重新合并(合流)是很常见的。这种行为可以产生多峰突破曲线(btc)在染料示踪的采样点位于汇流(s)下游。如果来自不同流的示踪云同时到达采样位置,这种现象也可能难以用染料示踪来突出。在本研究中,通过在双支流扩散-汇流(DC)系统中执行染料示踪活动并使用一维溶质输运模型,尝试量化不同标准在多峰BTC发生中的重要性。现场数据和溶质输运模型的结果表明,如果满足以下条件,双峰BTC会发生在直流系统的下游:(1)注入距离扩散点足够近,(2)采样点距离汇合处不太远,(3)两(或更多)流从扩散点到汇合处的旅行时间有充分的对比。本文说明,如果不满足这三个条件,即使在喀斯特河流中出现扩散,在汇流下游也不一定会出现多峰btc。因此,使用染料示踪来表征直流系统是一个真正的挑战。这可以解释为什么报道涉及多峰btc研究的出版物相当罕见。
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来源期刊
Hydrogeology Journal
Hydrogeology Journal 地学-地球科学综合
CiteScore
5.40
自引率
7.10%
发文量
128
审稿时长
6 months
期刊介绍: Hydrogeology Journal was founded in 1992 to foster understanding of hydrogeology; to describe worldwide progress in hydrogeology; and to provide an accessible forum for scientists, researchers, engineers, and practitioners in developing and industrialized countries. Since then, the journal has earned a large worldwide readership. Its peer-reviewed research articles integrate subsurface hydrology and geology with supporting disciplines: geochemistry, geophysics, geomorphology, geobiology, surface-water hydrology, tectonics, numerical modeling, economics, and sociology.
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