Effects of hydrogeological properties on sea-derived benzene transport in unconfined coastal aquifers

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Title:	Effects of hydrogeological properties on sea-derived benzene transport in unconfined coastal aquifers
Authors:	倪春發;Li, Wei-Ci;Ni, Chuen-Fa;Tsai, Chia-Hsing;Wei, Yi-Ming
Contributors:	地球科學學院應用地質研究所
Keywords:	Aquifers;Atmospheric Protection/Air Quality Control/Air Pollution;Beaches;Benzene;Benzene - analysis;Biodegradation;Chemical analysis;Cleaning process;Coastal aquifers;Coastal environments;Contaminants;Earth and Environmental Science;Ecology;Ecotoxicology;Environment;environmental factors;Environmental Management;Environmental Monitoring;Flow pattern;Fluctuations;Fluid mechanics;Geology;groundwater;Groundwater - chemistry;Groundwater discharge;Groundwater pollution;hydraulic conductivity;Hydraulic gradient;Hydraulics;Hydrocarbons;Hydrodynamics;Hydrogeology;Hydrology;Interfaces;Laboratories;Models, Chemical;Monitoring/Environmental Analysis;Monte Carlo simulation;Organic chemicals;Plumes;Pollutants;Seawater;Seawater - chemistry;Slopes;Tidal amplitude;Water analysis;Water Movements;Water Pollutants, Chemical - analysis
Date:	2016-05-01
Issue Date:	2026-04-23 14:56:04 (UTC+8)
Publisher:	Springer Netherlands;Cham: Springer International Publishing
Abstract:	摘要： This paper presents numerical investigations on quantifying the hydrodynamic effects of coastal environment factors, including tidal fluctuations, beach slopes, hydraulic conductivity, and hydraulic gradients on sea-derived benzene transport in unconfined coastal aquifers. A hydrologic transport and mixed geochemical kinetic/equilibrium reactions in saturated–unsaturated media model was used to simulate the spatial and temporal behaviors of the density flow and benzene transport for various hydrogeological conditions. Simulation results indicated that the tidal fluctuations lead to upper saline plumes (USPs) near the groundwater and seawater interfaces. Such local circulation zones trapped the seaward benzene plumes and carried them down in aquifers to the depth depending on the tide amplitudes and beach slopes across the coastal lines. Comparisons based on different tidal fluctuations, beach slopes, hydraulic conductivity, and hydraulic gradient were systematically conducted and quantified. The results indicated that areas with USPs increased with the tidal amplitude and decreased with the increasing beach slope. However, the variation of hydraulic conductivity and hydraulic gradient has relatively small influence on the patterns of flow fields in the study. The increase of the USP depths was linearly correlated with the increase of the tidal amplitudes. The benzene reactive transport simulations revealed that the plume migrations are mainly controlled by the local flow dynamics and constrained in the USP circulation zones. The self-cleaning process of a coastal aquifer is time-consuming, typically requiring double the time of the contamination process that the benzene plume reach the bottom of a USP circulation zone. The presented systematic analysis can provide useful information for rapidly evaluating seaward contaminants along a coastal line with available hydrogeological properties. 其他題名： Environ Monit Assess 出版者： Cham: Springer International Publishing 出版日期： 2016-05-01 出處： Environmental monitoring and assessment, 2016-05, Vol.188 (5), p.307-307, Article 307 資源來源： ABI/INFORM Collection 版權： Springer International Publishing Switzerland 2016 識別號： ISSN: 0167-6369 識別號： ISSN: 1573-2959 識別號： EISSN: 1573-2959 識別號： DOI: 10.1007/s10661-016-5307-2 識別號： PMID: 27106208
Appears in Collections:	[Graduate Institute of Applied Geology] journal & Dissertation

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