Effect of anisotropy on solute transport in degraded fen peat soils

Wang, Miaorun; Liu, Haojie; Zak, Dominik; Lennartz, Bernd

doi:10.1002/hyp.13717

Cited by 18 publications

(12 citation statements)

References 73 publications

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“…For the beach/dune sands, though, the aquifer sand K s value of the reference scenario (1.73 m d −1 ) was used as the minimum value. Anisotropy of K s has been reported repeatedly in peat (Beckwith et al, 2003;Wang et al, 2020), with fen peats showing a higher K s either in vertical or horizontal direction depending on peat type (Liu et al, 2016). Wang et al (2020) reported anisotropy in two fens with K s in the vertical direction being larger than the horizontal direction (K sv > K sh ) by a factor of six.…”

Section: Soil Physical Propertiesmentioning

confidence: 81%

“…Anisotropy of K s has been reported repeatedly in peat (Beckwith et al, 2003;Wang et al, 2020), with fen peats showing a higher K s either in vertical or horizontal direction depending on peat type (Liu et al, 2016). Wang et al (2020) reported anisotropy in two fens with K s in the vertical direction being larger than the horizontal direction (K sv > K sh ) by a factor of six. Liu et al (2016) described anisotropy with the higher flow in the horizontal direction by factors of up to seven.…”

Section: Soil Physical Propertiesmentioning

confidence: 81%

“…Our findings are consistent with Beckwith et al (2003), who showed that anisotropy has a smaller influence on groundwater flow patterns in peat than geological heterogeneity. Anisotropy also appeared to have a minor effect on phosphate transport than peat soil heterogeneity (Wang et al, 2020). The anisotropic angle was shown to be highly significant for determining the landward extent of seawater in a high hydraulic conductivity homogenous aquifer (Costall et al, 2020).…”

Section: Other Factorsmentioning

confidence: 93%

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Submarine Groundwater Discharge From Non-Tidal Coastal Peatlands Along the Baltic Sea

et al. 2021

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Submarine groundwater discharge (SGD) is an important pathway for water and materials within the land-ocean transition zone that can impact coastal environments and marine life. Although research from sandy shorelines has rapidly advanced in recent years, there is very little understanding of coastal areas characterized by a low hydraulic conductivity, such as carbon-rich coastal peatlands. The objective of this study was to determine the magnitude and location of terrestrial SGD to be expected from a non-tidal low-lying coastal peatland located along the Baltic Sea and to understand the controlling factors using numerical modeling. We employed the HYDRUS-2D modeling package to simulate water movement under steady-state conditions in a transect that extends from the dune dike-separated rewetted fen to the shallow sea. Soil physical properties, hydraulic gradients, geological stratifications, and topography were varied to depict the range of properties encountered in coastal peatlands. Our results show that terrestrial SGD occurs at the study site at a flux of 0.080 m2 d−1, with seepage rates of 1.05 cm d−1 (upper discharge region) and 0.16 cm d−1 (lower discharge region above submerged peat layer). These calculated seepage rates compare to observations from other wetland environments and SGD sites in the Baltic Sea. The groundwater originates mainly from the dune dike—recharged by precipitation and infiltration from ponded peatland surface water—and to a lesser extent from the sand aquifer. The scenario simulations yielded a range of potential SGD fluxes of 0.008–0.293 m2 d−1. They revealed that the location of terrestrial SGD is determined by the barrier function of the peat layer extending under the sea. However, it has little impact on volume flux as most SGD occurs near the shoreline. Magnitude of SGD is mainly driven by hydraulic gradient and the hydraulic conductivity of peat and beach/dune sands. Anisotropy in the horizontal direction, aquifer and peat thickness, and peatland elevation have little impacts on SGD. We conclude that SGD is most probable from coastal peatlands with high water levels, large Ks and/or a dune dike or belt, which could be an essential source for carbon and other materials via the SGD pathway.

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Section: Soil Physical Propertiesmentioning

confidence: 81%

Section: Soil Physical Propertiesmentioning

confidence: 81%

Section: Other Factorsmentioning

confidence: 93%

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Submarine Groundwater Discharge From Non-Tidal Coastal Peatlands Along the Baltic Sea

et al. 2021

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“…In recent decades, human activities have caused a large area of groundwater pollution. Understanding the movement of pollutants in groundwater is a prerequisite for controlling groundwater pollution 1 , 2 . However, the groundwater seepage characteristics of different aquifer media are extremely different.…”

Section: Introductionmentioning

confidence: 99%

Simulation of solute transport behaviors in saturated karst aquifer system

Chu

Ding

Zhang

2021

Sci Rep

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The karst development makes aquifer have strong anisotropy and heterogeneity. In order to reveal the characteristics of solute transport in the karst fissure–conduit aquifer system, this study presents a physical model of fissure–conduit in laboratory experiments to carry out the solute transport simulation. In this paper, the tracer tests of fissure–conduit combination, fissure, and conduit solute transport process in saturated flow are designed. We found that different aquifer structures and tracer injection points have an influence on the shape of the breakthrough curve. Besides, the two-dimensional dispersion model of tracer injection of the instantaneous point was used to calculate the dispersion parameters of each group of experiments. Then, the dynamic responses of the linear distance (x) between the injection point and the receiving point, initial time (t0), peak time (tm), peak concentration (cm), average tracer transport velocity (V), and porosity (p) of aqueous media to the longitudinal dispersion coefficient are discussed. In addition, according to the measured data, Gaussian multi-peak fitting can be used to reflect the overall shape and change trend of the multi-peak BTC. These results demonstrate the solute transport behaviors in the saturated karst aquifer system, which have important reference significance for solving the engineering environmental problems in the karst area.

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“…However, such changes might promote internal release of P due to favoured reduction of redox-sensitive iron(III)-P binding forms (Zak et al, 2018). On the other hand, the P transport to surface or ground water can be diminished due to lowered preferential flow, but this is a topic that requires further research (Wang et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Impact of vegetation harvesting on nutrient removal and plant biomass quality in wetland buffer zones

et al. 2020

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Fertiliser use in agriculture increases the non-point pollution of waters with nitrogen (N) and phosphorus (P). Wetland buffer zones (WBZs) are wetland ecosystems between agricultural lands and water bodies that protect surface waters from nonpoint source pollution. We assessed how vegetation harvesting within WBZs impacts their N and P removal efficiency, nutrient uptake by plants and their biomass quality. We surveyed vegetation of a spontaneously rewetted fen along a small river in Poland,

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Effect of anisotropy on solute transport in degraded fen peat soils

Cited by 18 publications

References 73 publications

Submarine Groundwater Discharge From Non-Tidal Coastal Peatlands Along the Baltic Sea

Submarine Groundwater Discharge From Non-Tidal Coastal Peatlands Along the Baltic Sea

Simulation of solute transport behaviors in saturated karst aquifer system

Impact of vegetation harvesting on nutrient removal and plant biomass quality in wetland buffer zones

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