水文地质和气候条件对喀斯特含水层活塞流影响的统计分析

IF 3.2 3区 地球科学 Q1 Environmental Science
Javad Ashjari, Alan E. Fryar, Benjamin Tobin, Zohreh Ashjari
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引用次数: 0

摘要

活塞流是用来描述岩溶管道中管满流过程中压力脉动现象的术语。在活塞流动期间,由于稀薄的大气补给取代了管道中的水,在岩溶泉处,流量增加,比电导降低。这项研究的目的是为了更深入地了解如何在全球范围内确定活塞流量。为了实现这一目标,该研究根据水线模式和特定电导率时间序列定义了六个阶段(稳定阶段、滞后阶段、液压阶段、动员阶段、稀释阶段和恢复阶段)。他们收集并分析了来自全球42个不同地点的69次洪水事件的数据。该分析考虑了岩性、含水层类型、异源或自源补给、降水数量和强度、风暴前干旱期、水文曲线形状和衰退系数、比导时间序列参数、记忆效应、调节时间和滞后回路类型等多种因素,以确定是否可以利用这些参数来区分类群。洪水事件主要分为两类:有活塞流的和没有活塞流的。此外,根据流动储水的位置,将具有活塞流的情况分为五个亚组。结果表明,活塞流在任何喀斯特环境、气候区域和水文情况下都可以观测到,但更可能发生在暴风雨前的长时间干旱期、高降水和强降雨期间。动员储水最有可能在潜水带中发现,但也可能存在于土壤或表层岩溶带中。活塞流动的发生取决于基质的储存能力以及管道系统的发展,这些管道系统不会显著削弱基质的水力功能。活塞流动中的滞后类型主要受事前水或事前水和事件水的混合物的影响,而在没有活塞流动的系统中,滞后类型主要受事件水的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Influence of Hydrogeological and Climatic Conditions on Piston Flow in Karst Aquifers Using Statistical Approach

Piston flow is a term used to describe the phenomenon of the pressure pulse during pipe-full flow in karst conduits. During piston flow, as dilute meteoric recharge displaces water present in the conduits, discharge increases and specific conductance decreases at karstic springs. The aim of this research is to gain a deeper understanding of how piston flow can be identified on a global scale. To achieve this, the study has defined six phases (stable, lag, hydraulic pressure, mobilisation, dilution and recovery) based on the pattern of hydrographs and specific conductivity time series. Data from 69 flood events at 42 different locations worldwide have been collected and analysed. This analysis considered various factors such as lithology, aquifer type, allogenic or autogenic recharge, precipitation amount and intensity, dry period before storm, hydrograph shape and recession coefficient, specific-conductance time series parameters, memory effect, regulation time and typology of hysteresis loop in order to determine if groups could be differentiated using these parameters. The flood events were classified into two main groups: those with piston flow and those without. Furthermore, the cases with piston flow were categorised into five subgroups based on the location of mobilised stored water. The results show that piston flow can be observed in any karst setting, climatic region and hydrological situation, although it is more likely to occur during extended dry periods preceding a storm, periods of high precipitation and intense rainfall. The mobilised stored water is most likely found in the phreatic zone, but could also be present in the soil or epikarst zone. The occurrence of piston flow depends on the storage capacity of the matrix as well as the development of conduit systems that do not significantly weaken the hydraulic function of the matrix. The typology of hysteresis in piston flow is primarily influenced by the presence of pre-event water or a mixture of pre-event and event water, whereas in systems without piston flow, it is mainly affected by event water.

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来源期刊
Hydrological Processes
Hydrological Processes 环境科学-水资源
CiteScore
6.00
自引率
12.50%
发文量
313
审稿时长
2-4 weeks
期刊介绍: Hydrological Processes is an international journal that publishes original scientific papers advancing understanding of the mechanisms underlying the movement and storage of water in the environment, and the interaction of water with geological, biogeochemical, atmospheric and ecological systems. Not all papers related to water resources are appropriate for submission to this journal; rather we seek papers that clearly articulate the role(s) of hydrological processes.
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