Incorporation of Total Stress Changes into the Ground Water Model SUTRA

Reeves, Howard W.; Thibodeau, Peter M.; Underwood, Robert G.; Gardner, Leonard Robert

doi:10.1111/j.1745-6584.2000.tb00205.x

Cited by 77 publications

(56 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…in the SUTRA code [Voss and Provost, 2008] is shown below with a modification to account for tidal loading on the marsh system according to Reeves et al [2000] and Xin et al [2012], ] are the compressibility coefficients of soil matrix and water, respectively. The last source/sink term on the right side of equation (1) …”

Section: 1002/2015wr016911mentioning

confidence: 99%

Effects of salinity variations on pore water flow in salt marshes

Shen

Jin

Xin

et al. 2015

Water Resources Research

View full text Add to dashboard Cite

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.

show abstract

Section: 1002/2015wr016911mentioning

confidence: 99%

Effects of salinity variations on pore water flow in salt marshes

Shen

Jin

Xin

et al. 2015

Water Resources Research

View full text Add to dashboard Cite

show abstract

“…The details of the coupling approach and model validation can be found in et al (2011). SUTRA was modified with a tidal loading term added to the governing Richards' equation (RE) for the variably saturated pore-water flow in the marsh soil to account for the effects of varying total stress (Gardner and Wilson, 2006;Reeves et al, 2000).…”

Section: Mathematical Modelmentioning

confidence: 99%

“…Physically, the total stress on the soil skeleton is not constant during the flooding but varies in the same way as the pore-water pressure, thus giving approximately an invariant effective stress (i.e., no expansion or contraction of soil matrix). To account for the total stress variation and remove the artificial flux, a tidal loading term needs to be incorporated into RE (Gardner and Wilson, 2006;Reeves et al, 2000;Wilson and Morris, 2012;Yuan et al, 2011), …”

Section: Yuanmentioning

confidence: 99%

“…The model of Yuan et al (2011) was used to simulate coupled surface water and groundwater flow within the modeled marsh system. To account for the effect of varying total stress during inundation of the marsh platform, the SUTRA (Voss and Provost, 2008) code for groundwater flow modeling was modified by incorporating a tidal loading term into the governing Richards equation (Reeves et al, 2000). Particle tracking was used to elucidate the simulated flow characteristics, in particular, pore-water circulation paths related to the tidally averaged flow and associated travel times.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of soil stratigraphy on pore-water flow in a creek-marsh system

Xin

Kong

et al. 2012

Journal of Hydrology

View full text Add to dashboard Cite

In coastal marshes, low-permeability mud is often found overlying high permeability sandy deposits. A recently developed 3D creek-marsh model was used to investigate the effects of soil stratigraphy (a mud layer overlying a sandy-loam layer) on pore-water flow in the marsh.Simulation results showed significant modifications of tide-induced pore-water flow due to the layered soil. The presence of the lower sandy-loam layer with a relatively high hydraulic conductivity not only increased the pore-water flow speed but also changed the flow direction, particularly in the upper mud layer where enhanced vertical flow dominated. Particle tracking revealed large changes in the overall pore-water circulation pattern, and associated particle travel path and time due to the influence of the soil stratigraphy. While the amount of water exchange between the marsh soil and tidal water increased, the residence time of particles in both soil layers was reduced. Sensitivity analysis showed the importance of soil compressibility, capillary rise and hydraulic conductivity contrast between the soil layers in modulating the effect of soil stratigraphy. In particular, the total net influx and efflux across the marsh surface (including the creek/channel bank and bed) increased proportionally with the square root of the lower layer's hydraulic conductivity. These results demonstrated the interplay of tides, marsh topography and soil stratigraphy in controlling the pore-water flow characteristics, which underpin solute transport and transformation as well as the aeration condition in the marsh soil.  Flow in the two-layer marsh differs dramatically from that in a homogeneous marsh. The underlying sandy-loam layer modifies significantly the pore-water circulation. We examine effects of soil compressibility, capillarity and hydraulic conductivity.

show abstract

“…Jeng et al [2005] develop an analytical solution to the Boussinesq equation to address spring-neap tide induced fluctuations in a sloping coastal aquifer. More detailed hydrologic models have been derived to describe various individual components of tidal marsh hydrology, such as the vertical flow of groundwater in response to evapotranspiration demand and the piezometric pressure of an underlying aquifer [Hemond and Fifield, 1982], surface infiltration [Hemond et al, 1984], horizontal fluxes [Nuttle and Hemond, 1988], and the stress and pressure changes due to tidal loading of the marsh surface [Reeves et al, 2000]. Attempts to link together different hydrologic processes in wetland environments have been undertaken using numerical models [Ursino et al, 2004;Wilson and Gardner, 2005;Li et al, 2005;Skags et al, 2005;Thompson et al, 2004;Twilley and Chen, 1998].…”

Section: Introductionmentioning

confidence: 99%

A simple model for predicting water table fluctuations in a tidal marsh

Montalto

Parlange

Steenhuis

2007

Water Resources Research

View full text Add to dashboard Cite

[1] Wetland restoration efforts are ongoing in many urban estuaries. In this context the hydrologic characteristics of restored wetlands are of paramount importance since the spatially and temporally variable position of the water table and of soil saturation establishes the oxidation state of the substrate, which, in turn, affects the wetland's biogeochemical composition and the biological communities it is capable of supporting. A relatively simple analytical model developed here describes tidal marsh hydrology from creek bank to interior, considering transient drainage, net meteorological inputs, and tidal effects. Given a series of physical and time-dependent inputs, the analytical solution derived predicts the position of the water table at points along a transect perpendicular to a tidal creek. Validation of the model using water table time series data collected along three transects at Piermont Marsh, a tidal wetland on the Hudson River in the New York/ New Jersey Estuary, indicates good general agreement between observations and predictions, although it may not be precise enough for some kinds of ecological applications. A sensitivity analysis on the model indicates that a range of pairs of transmissivity and specific yield values that increase with distance from the creek results in the same spatial and temporal fluctuations in the water table. This equifinality result is discussed as it relates to the predictive capacity of the model presented.

show abstract

Incorporation of Total Stress Changes into the Ground Water Model SUTRA

Cited by 77 publications

References 10 publications

Effects of salinity variations on pore water flow in salt marshes

Effects of salinity variations on pore water flow in salt marshes

Effects of soil stratigraphy on pore-water flow in a creek-marsh system

A simple model for predicting water table fluctuations in a tidal marsh

Contact Info

Product

Resources

About