Groundwater regime of a tidally influenced coastal pond

Vaněk, V.

doi:10.1016/0022-1694(93)90241-z

Cited by 24 publications

(16 citation statements)

References 23 publications

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“…4; Toth 1963, Mazor & Nativ 1992. This pattern in hydraulic head is consistent with measurements of subtidal sediment porewater conductivity showing increasing salinities towards the central axis of Little Pond, using a shallow ( > 3 cm) porewater conductivity probe (Vanek 1993). Such decreases in discharge rates with increasing distance from shore have been modelled theoretically in lakes (McBride & Pfannkuch 1975), and also confirmed by seepage meter measurements in a marine setting (Bokuniewicz 1980, Capone & Bautista 1985.…”

Section: Discussionsupporting

confidence: 85%

“…3), and the finegrained sediments are thinner (< 1 m) and different in character than at transects B-B' and C-C'. The differing character of these sediments appears to be linked to the effects of high vertical seepage rates on their permeability (Vanek 1993). This is consistent with the observed high porosity (80%) of the fine-grained bottom deposits (0 to 0.6 m thick) at transect A-A' which did not decline substantially with depth (Fig.…”

Section: S L T E I Bsupporting

confidence: 81%

“…Porewater salinity profiles at C-C' were similar to B-B'. Vanek (1993), modelling salt transport within these sediments, concluded that transport was at very low rates consistent with molecular diffusion as opposed to advective transport mented but is probably driven by density differences. At the cross-section nearest the tidal inlet, C-C', the thickness of the finegrained bottom sediments increased to more than 3 m at mid-pond.…”

Section: S L T E I Bmentioning

confidence: 96%

“…10. Flow from the pond (arrows along east and southwest shore) is based upon the hydraulic gradients created to the east of Little Pond by the elevated embayment levels potential and is complex (Reilly & Goodman 1985, Vanek 1993. Along the eastern shore, the higher density of downward seeping, saline embayment water caused it to sink below adjacent fresh groundwater.…”

mentioning

confidence: 99%

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Nutrient balance of a shallow coastal embayment: I. Patterns of groundwater discharge

Millham¹,

Howes²

1994

Mar. Ecol. Prog. Ser.

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The rate and pattern of groundwater discharge to a shallow coastal embayment was found to be very dynamic, being modified by short-term changes in upland hydrologic processes, fluctuations in the hydraulics of the receiving waters, and long-term changes due to depositional processes within the tidal basin. The regional and embayment morphology resulting from deglaciation and subsequent depositional processes within the aquatic system were found to be major factors affecting current patterns of groundwater discharge. Discharge through the embayment bottom based upon measured profiles of interstitial salinity, temperature, and porosity indicated that fine-grained, subtidal sediments (> 1 m thick) had low hydraulic conductivities and acted as aquicludes, limiting seepage to the marginal nearshore zone. The hydraulic gradients determining groundwater discharge to embayment waters were coupled to tidal elevations, generating periodic increases or decreases in rates of freshwater inflow. Water table maps and interstitial salinity profiles indicated that as mean tidal levels increased, groundwater discharge decreased, and conversely at low mean tide levels discharge into the embayment increased. During peak embayment levels the embayment acted like a flow-through lake with groundwater discharging along one shore while saline embayment waters simultaneously infiltrated along the opposite shore. Simultaneously, upland groundwater flow diverged from the embayment, resulting in significant reduction (29%) in the area contributing groundwater to the embayment. Changes in the patterns and rates of groundwater discharge, due to seasonal variations in water table elevation or short-term variations in embayment level, underscore the need to integrate upland water table mapping with hydraulic measurements within the zone of discharge when estimating the input of groundwater and groundwater-borne nutrients to coastal embayments.

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Section: Discussionsupporting

confidence: 85%

Section: S L T E I Bsupporting

confidence: 81%

Section: S L T E I Bmentioning

confidence: 96%

mentioning

confidence: 99%

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Nutrient balance of a shallow coastal embayment: I. Patterns of groundwater discharge

Millham¹,

Howes²

1994

Mar. Ecol. Prog. Ser.

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“…Moreover, heterogeneities in the thickness of the sediment layer separating the aquifer from surface water bodies affect the distance of offshore seepage [Cherkauer and Nader, 1989]. The hydrodynamic effects of a GSI on a contaminant plume have been extensively described [Sacks et al, 1992;Shedlock et al, 1993;Vanek, 1993;Devito et al, 1996]. However, the effects of this physical interaction on the aquifer oxidation-reduction capacities and in situ microbial activity has received limited attention [Strobel, 1995].…”

mentioning

confidence: 99%

Geophysical characterization, redox zonation, and contaminant distribution at a groundwater/surface water interface

Lendvay

Sauck

McCormick

et al. 1998

Water Resources Research

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Abstract. Three transects along a groundwater/surface water interface were characterized for spatial distributions of chlorinated aliphatic hydrocarbons and geochemical conditions to evaluate the natural bioremediation potential of this environmental system. Partly on the basis of ground penetrating radar measurements, a conductive sediment layer was detected from the shore out to at least 300 m offshore which exhibited gradients in redox pairs and contaminant profiles. The cis-Dichloroethene and 1-chloroethene were predominant in the presence of elevated methane and ferrous iron concentrations and depressed sulfate and aquifer solids-bound iron concentrations. The shallow monitoring points were generally hypoxic to aerobic and exhibited values of specific conductance reflective of near-shore lake water, indicating reoxygenation of the contaminant plume due to wave infiltration. The barge transect yielded trace contaminant concentrations and showed evidence of sulfate reduction. These analyses contributed to the understanding of processes affecting contaminant fate and transport at near-shore mixing zones. Whereas inland GSIs are generally characterized by a relatively sharp front between the two water bodies, this feature is less distinctive for coastal regions experiencing seiche action 3545

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Fine-scale characteristics of groundwater flow in a peatland

et al. 1999

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Abstract:Fine-scale dynamics of groundwater¯ow were studied in a 1 . 5 ha peatland in central New York. Measurements of the hydraulic head throughout a detailed network of piezometer clusters revealed spatial and temporal variability in the direction of groundwater¯ow at a very ®ne (within a few metres) scale of analysis. Within the small wetland, there were areas of groundwater recharge, discharge and lateral¯ow. Such patterns of groundwater¯ow frequently reversed or changed due to¯uctuations of only a few centimetres in hydraulic head. Speci®c conductance, deuterium signatures and calcium concentrations of groundwater corroborated the groundwater¯ow patterns determined with hydraulic head measurements and illustrated the in¯uence of source water chemistry and evaporation on dierent layers in the peat column. The control of peat chemistry by such ®ne-scale groundwater¯ow may have important implications for plant community composition and diversity in groundwater-fed peatlands.

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Groundwater regime of a tidally influenced coastal pond

Cited by 24 publications

References 23 publications

Nutrient balance of a shallow coastal embayment: I. Patterns of groundwater discharge

Nutrient balance of a shallow coastal embayment: I. Patterns of groundwater discharge

Geophysical characterization, redox zonation, and contaminant distribution at a groundwater/surface water interface

Fine-scale characteristics of groundwater flow in a peatland

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