Simulation of Tidal Effects on Contaminant Transport in Porous Media

Yim, Chan S.; Mohsen, M. F. N.

doi:10.1111/j.1745-6584.1992.tb00814.x

Cited by 46 publications

(20 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This diluted solute in the subsurface zone near the interface would then be discharged into the lake by the local water circulation or when wind waves ceased. Several studies [1,50] have reported a decrease in solute concentrations in downstream reservoirs driven by tidally fluctuating water levels, while solute concentrations in groundwater were higher than those in the downstream reservoirs. As Lewandowski et al [8] reported, the biogeochemical turnover of nitrogen is common at the reactive aquifer-lake interface, in particular when driven by local water circulations.…”

Section: Discussionmentioning

confidence: 99%

Simulating the Effects of Lake Wind Waves on Water and Solute Exchange across the Lakeshore Using Hydrus-2D

Šimůnek

Wang

et al. 2017

Water

View full text Add to dashboard Cite

Abstract:Wind waves, which frequently occur on large surface water bodies such as lakes, may temporarily alter flow patterns in a subsurface zone and the corresponding water and nutrient interactions between surface waters and shallow groundwaters. To better understand these processes, soil flume experiments were carried out to investigate wind wave-driven water and chloride interactions across the lake-groundwater interface, and the Hydrus-2D model was used to analyze and evaluate the observed experimental results. Two interaction cases between the lake and groundwater systems were considered: groundwater discharging into a lake (the GDL case), and lake water recharging groundwater (the LRG case). For comparison, no-wave conditions for both the GDL and LRG cases were also analyzed. The results revealed that, similarly to no-wave conditions, water and chloride exchange fluxes between the lake and groundwater systems under wave conditions occurred mainly within narrow bands near the intersection of the water level in the lake and the interface in both the GDL and LRG cases, and then exponentially decreased along the interface. Most water and chloride that infiltrated into the subsurface zone through the upper part of the interface during a wave crest returned to the lake through the lower part during a wave trough in both the GDL and LRG cases, creating local recirculation zones in the subsurface near the interface. Such recirculation produced a more frequent exchange of water and solute across the interface compared with those under no-wave conditions. During a one-day period after wind waves started, the total exchange fluxes of water and chloride to the lake decreased by 36.2% and 71.9%, respectively, compared to the no-wave conditions in the GDL case. In the LRG case, the total exchange water fluxes to the subsurface increased by 89.7%, while the total exchange chloride fluxes increased only slightly (4.5%) compared to the no-wave conditions due to the difference in chloride concentrations between the upper and lower parts of the interface. The sensitivity analysis revealed that the hydraulic conductivity of the lakeshore zone and the characteristics of the waves were important factors influencing water and chloride exchange between the lake and groundwater systems. The simulated results helped us to better understand water and solute interactions in the lake-groundwater system during windy periods.

show abstract

Section: Discussionmentioning

confidence: 99%

Simulating the Effects of Lake Wind Waves on Water and Solute Exchange across the Lakeshore Using Hydrus-2D

Šimůnek

Wang

et al. 2017

Water

View full text Add to dashboard Cite

show abstract

“…Of the greatest importance to us is the work of Yim and Mohsen (1992) who showed mathematically that tidal fluctuations cause the concentration levels discharging to coastal waters to be lowered due to dilution and Khondaker et al (1997) who also numerically predicted a decrease in solute concentration with time under the influence of tidal fluctuation.…”

Section: Introductionmentioning

confidence: 98%

Investigation of Groundwater Contaminant Discharge into Tidally Influenced Surface-Water Bodies: Experimental Results

Chen¹,

Pinder

2011

Transp Porous Med

View full text Add to dashboard Cite

An investigation of the effect of tidally influenced water elevations on the concentration of groundwater contaminants discharging to a surface-water body is studied using a one-dimensional homogeneous sand column. A constant water level is imposed upstream, and the downstream water level is controlled by a wave generator that controls the hydraulic head to mimic a 12-h tidal fluctuation. The experimental results demonstrate that the tidal fluctuations in the downstream reservoir result in a decrease in average contaminant concentration at the point of discharge to the tidally influenced surface-water body. The further upstream an observation well is located, the smaller the amplitude of the concentration oscillation. Fourier analysis suggests that the dominant frequency of the pressure at different locations along the length of the column is identically two cycles per day and that the concentration data have a dominant frequency of two cycles per day, but also exhibit harmonics.

show abstract

“…Despite the reduction in contaminant concentration in the "tidally active" zone of the aquifer, they also noted that tidal pumping hastened the migration of contaminants to the estuary. Under tidal pumping, velocities in sediments closer to the aquifer-stream interface experienced fluctuations of the largest magnitude, resulting in a higher rate of dispersive flux and advection to and from the river [Yim and Mohsen, 1992].…”

Section: Introductionmentioning

confidence: 99%

“…[7] The effect of tidal pumping on contaminant transport to an estuary was investigated in a model study by Yim and Mohsen [1992]. In their base-case simulation with a tidal amplitude of 0.3 m and regional groundwater velocity of 0.03 m d −1 (K h = 0.61 m d −1 , gradient = 0.01, porosity = 0.20), tides reduced the concentration of contaminants up to a distance of 12 m inland from the estuary-aquifer interface.…”

Section: Introductionmentioning

confidence: 99%

Quantifying hyporheic exchange in a tidal river using temperature time series

Bianchin

Smith

Beckie

2010

Water Resources Research

View full text Add to dashboard Cite

[1] An investigation into groundwater-surface water interaction (GSWI) beneath a large tidally influenced river was conducted to determine the effect of tides on the development of a hyporheic zone (HZ) and to quantify mixing of river water and groundwater. Temperature measurements, coupled with independent hydraulic head measurements, were used to detect groundwater flow within the riverbed. GWSI under tidal forcing produced a 1 m deep HZ. Time-averaged riverbed temperature profiles displayed a distinct compressed convex pattern: clear evidence of net groundwater discharge. However, the instantaneous time series data indicate that riverbed temperatures were affected by tidal forcing to a depth of 1 m. Heat transport modeling revealed that instantaneous velocities within the shallow sediments of the riverbed are rather high, creating a zone of vigorous exchange during either a flooding or ebbing tide. Furthermore, the magnitude of the tidal pressure gradient was found to be significantly greater than the pressure gradient expected across 0.8 m high dunes, evidence that bed-form-driven exchange under these conditions, and this scale of observation, did not contribute to the development of the HZ. Conditions for exchange induced by shear and current bed form are favorable during ebbing tidal conditions only; flow paths are therefore limited in depth. Exchange flow paths in an estuary setting are complex; they are limited in duration and space and dominated by tidal pumping.

show abstract

Simulation of Tidal Effects on Contaminant Transport in Porous Media

Cited by 46 publications

References 3 publications

Simulating the Effects of Lake Wind Waves on Water and Solute Exchange across the Lakeshore Using Hydrus-2D

Simulating the Effects of Lake Wind Waves on Water and Solute Exchange across the Lakeshore Using Hydrus-2D

Investigation of Groundwater Contaminant Discharge into Tidally Influenced Surface-Water Bodies: Experimental Results

Quantifying hyporheic exchange in a tidal river using temperature time series

Contact Info

Product

Resources

About