Modelling of groundwater–vegetation interactions in a tidal marsh

Xin, Pei; Kong, Jun; Li, Ling; Barry, David Andrew

doi:10.1016/j.advwatres.2013.04.005

Cited by 49 publications

(57 citation statements)

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“…This would in turn affect the distributions of different plant species. With further consideration of evapotranspiration and soil aeration [Xin et al, 2013b], the findings from this study may help to better explain the phenomenon of plant zonation.…”

Section: 1002/2015wr016911mentioning

confidence: 99%

“…These ecological functions of marsh systems are affected by various physical and biogeochemical processes, among which pore water flow and associated solute transport play an important role in determining the soil condition and salinity distribution for marsh plant growth, and the material exchange between the marsh sediment and seawater [Gardner, 2007;Marani et al, 2006;Ursino et al, 2004;Wilson and Gardner, 2006;Wilson et al, 2014;Xin et al, 2013b;Zhang et al, 2014].…”

Section: Introductionmentioning

confidence: 99%

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Effects of salinity variations on pore water flow in salt marshes

Shen

Jin

Xin

et al. 2015

Water Resources Research

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Spatial and temporal salinity variations in surface water and pore water commonly exist in salt marshes under the combined influence of tidal inundation, precipitation, evapotranspiration, and inland freshwater input. Laboratory experiments and numerical simulations were conducted to investigate how density gradients associated with salinity variations affect pore water flow in the salt marsh system. The results showed that upward salinity (density) gradients could lead to flow instability and the formation of salt fingers. These fingers, varying in size with the distance from the creek, modified significantly the pore water flow field, especially in the marsh interior. While the flow instability enhanced local salt transport and mixing considerably, the net effect was small, causing only a slight increase in the overall mass exchange across the marsh surface. In contrast, downward salinity gradients exerted less influence on the pore water flow in the marsh soil and slightly weakened the surface water and groundwater exchange across the marsh surface. Numerical simulations revealed similar density effects on pore water flow at the field scale under realistic conditions. These findings have important implications for studies of marsh soil conditions concerning plant growth as well as nutrient exchange between the marsh and coastal marine system.

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Section: 1002/2015wr016911mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of salinity variations on pore water flow in salt marshes

Shen

Jin

Xin

et al. 2015

Water Resources Research

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“…These simulations tested inundating and noninundating tides separately. More advanced numerical models that allowed the tidal amplitude to vary with time showed that spring-neap variations cause significant temporal variations in the hydrology of the root zone in salt marshes [Xin et al, 2010[Xin et al, , 2013, but these simulations did not report the resulting variations in SGD. Thus, the degree of nonlinearity associated with variations in tidal amplitude and mean water level remains largely untested in field settings.…”

Section: Introductionmentioning

confidence: 99%

What time scales are important for monitoring tidally influenced submarine groundwater discharge? Insights from a salt marsh

Wilson

Evans

Moore

et al. 2015

Water Resources Research

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Submarine groundwater discharge (SGD) varies significantly across time scales ranging from hours to years, but studies that allow quantitative comparisons between different time scales are few. Most of these studies have focused on beach settings, where the combined variations in fresh and saline SGD can be difficult to interpret. We calculated variations in saline SGD based on a 1 year record of hydraulic head in a salt marsh, where we could isolate variations in saline, tidally driven SGD. Observed SGD varied by an order of magnitude over the course of the year. Groundwater discharge was proportional to tidal amplitude and varied by at least a factor of 2 between spring and neap tides. Monthly average SGD was inversely proportional to average sea level; it increased by nearly a factor of 2 as sea level declined by 50 cm from late summer to late winter. This variation was far larger than that predicted by analytic models, owing to the flat topography and inundation of the marsh platform. The effect of short-term (days) variations in sea level associated with wind events and storms was small in comparison. SGD is probably proportional to tidal amplitude in nearly all coastal settings, including beaches. Seasonal variations in sea level may not affect the volume of SGD as significantly in coastal settings where the slope of the intertidal zone is relatively constant, but such variations have the potential to strongly affect the composition of SGD.

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“…Propõe-se que os princípios de intrusão das águas de um rio e do mar são similares. Xin & Ling Li (2013) prevê que os mesmos podem provocar alterações nas águas subterrâneas e vegetação, em função das concentrações de sais que podem conter íons tóxicos. Vervoot & Zee (2012) identifica que a captação de água subterrânea para os sistemas de irrigação, sobretudo nas regiões áridas e regiões costeiras, necessita de desenvolvimento tecnológico em prol da sustentabilidade do recurso natural a fim de controlar a qualidade das águas.…”

Section: Introductionunclassified

Modelagem da intrusão da água de um rio com diferentes concentrações de sais

Marino

2015

Rev. bras. eng. agríc. ambient.

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Para considerações de intrusão de água em meio subterrâneo a capilaridade, também entendida como força de sucção, é uma grandeza física que influencia a dinâmica do processo. Neste trabalho é apresentada uma investigação do comportamento do escoamento subterrâneo e as interações entre água doce e água salinizada na área de descarga de um rio. Objetivou-se realizar uma modelagem preditiva para identificar e representar o processo de intrusão das águas de um rio meio ao lençol freático comparando diferentes concentrações de sais nas águas do rio e águas subterrâneas. Como modelo conceitual foi definido um rio em região de descarga. A modelagem foi realizada no software SUTRA sendo o método de solução por elementos finitos. Observou-se a formação de uma camada de água doce sobre o lençol freático salinizado quando considerada intrusão de água doce. Para as considerações com intrusão de água salinizada foi identificada a formação de fingers. Os resultados do modelo possibilitaram identificar que a intrusão de água doce no lençol freático salinizado é dificultada pela presença de sais. A intrusão é mais difícil quanto maior a concentração de sais nas águas subterrâneas.

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Modelling of groundwater–vegetation interactions in a tidal marsh

Cited by 49 publications

References 49 publications

Effects of salinity variations on pore water flow in salt marshes

Effects of salinity variations on pore water flow in salt marshes

What time scales are important for monitoring tidally influenced submarine groundwater discharge? Insights from a salt marsh

Modelagem da intrusão da água de um rio com diferentes concentrações de sais

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