Artificially Drained Catchments—From Monitoring Studies towards Management Approaches

Lennartz, Bernd; Tiemeyer, Bärbel; Rooij, Gerrit de; Dolezal, F.

doi:10.2136/vzj2009.0149

Cited by 18 publications

(7 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The implemented exchange model followed the Gapon convention [51] with Ca 2+ as the reference cation. The sediment cation exchange capacity was calibrated, yielding a value (11.9 cmol/kg) in line with that measured by Baker et al [50] (21 cmol/kg) and other data cited by these authors (0.9-45 cmol/kg) for INL site materials.…”

Section: Methodssupporting

confidence: 66%

See 1 more Smart Citation

Geophysical monitoring and reactive transport modeling of ureolytically-driven calcium carbonate precipitation

Ajo‐Franklin

Spycher

et al. 2011

Geochem Trans

View full text Add to dashboard Cite

Ureolytically-driven calcium carbonate precipitation is the basis for a promising in-situ remediation method for sequestration of divalent radionuclide and trace metal ions. It has also been proposed for use in geotechnical engineering for soil strengthening applications. Monitoring the occurrence, spatial distribution, and temporal evolution of calcium carbonate precipitation in the subsurface is critical for evaluating the performance of this technology and for developing the predictive models needed for engineering application. In this study, we conducted laboratory column experiments using natural sediment and groundwater to evaluate the utility of geophysical (complex resistivity and seismic) sensing methods, dynamic synchrotron x-ray computed tomography (micro-CT), and reactive transport modeling for tracking ureolytically-driven calcium carbonate precipitation processes under site relevant conditions. Reactive transport modeling with TOUGHREACT successfully simulated the changes of the major chemical components during urea hydrolysis. Even at the relatively low level of urea hydrolysis observed in the experiments, the simulations predicted an enhanced calcium carbonate precipitation rate that was 3-4 times greater than the baseline level. Reactive transport modeling results, geophysical monitoring data and micro-CT imaging correlated well with reaction processes validated by geochemical data. In particular, increases in ionic strength of the pore fluid during urea hydrolysis predicted by geochemical modeling were successfully captured by electrical conductivity measurements and confirmed by geochemical data. The low level of urea hydrolysis and calcium carbonate precipitation suggested by the model and geochemical data was corroborated by minor changes in seismic P-wave velocity measurements and micro-CT imaging; the latter provided direct evidence of sparsely distributed calcium carbonate precipitation. Ion exchange processes promoted through NH4+ production during urea hydrolysis were incorporated in the model and captured critical changes in the major metal species. The electrical phase increases were potentially due to ion exchange processes that modified charge structure at mineral/water interfaces. Our study revealed the potential of geophysical monitoring for geochemical changes during urea hydrolysis and the advantages of combining multiple approaches to understand complex biogeochemical processes in the subsurface.

show abstract

Section: Methodssupporting

confidence: 66%

“…Ion selectivity coefficients for INL sediments from Baker et al [50] were used, except for K + , for which no data were reported by these authors, and for which the same selectivity as for Na + was assumed. The implemented exchange model followed the Gapon convention [51] with Ca 2+ as the reference cation.…”

Section: Methodsmentioning

confidence: 99%

Geophysical monitoring and reactive transport modeling of ureolytically-driven calcium carbonate precipitation

Ajo‐Franklin

Spycher

et al. 2011

Geochem Trans

View full text Add to dashboard Cite

show abstract

“…Man‐made features changes in small rural catchments may concern the planning of tillage practices (Mwendera and Feyen, 1994; Yu et al , 2000), tile drainage (Tiemeyer et al , 2007; Lennartz et al , 2010), ditch networks (Carluer and De Marsily, 2004), water‐harvesting systems (Ouessar et al , 2009) or riparian areas (McKergow et al , 2003). Some land management scenarios on small catchments may be compared using distributed modelling.…”

Section: Introductionmentioning

confidence: 99%

Impact of the spatial arrangement of land management practices on surface runoff for small catchments

Colin

Moussa²,

Louchart³

2011

Hydrological Processes

View full text Add to dashboard Cite

Abstract:Predicting the impact of land use changes on the hydrological response is crucial for water resource management. In the particular case of small catchments (1-10 km 2 ), distributed models could provide useful answers regarding the effects of cultivation practices and man-made works on water fluxes. However, the impacts of specific land use spatial arrangements are difficult to predict because of the prohibitive number of possible cases to consider. Focusing on surface runoff, this article describes a strategy based on a water particle tracking routine to be plugged-in a distributed model that is designed to determine the spatial arrangements of land management practices that have the greatest impact on volume, peak discharge and lag time at the catchment outlet. A case study is described; the hydrological response of the Roujan catchment (Herault, France) is simulated with the MHYDAS model. The Roujan catchment contains a vineyard in a Mediterranean climate in a landscape in which weeding practices highly influence the partition between soil infiltration and runoff. Results showed that the proposed strategy is much more efficient than a random approach to design the spatial arrangements of the vineyard weeding practices with the greatest impact. Therefore, the proposed strategy may lead to innovative policies for the spatial planning of land management practices.

show abstract

“…The precipitation surplus is often discharged via dense, partially man-made drainage systems (Lennartz et al, 2009). For individual fields, drainage theory based on analytical solutions for the predominantly horizontal flow in the phreatic aquifer has proven its value for several decades (Hooghoudt, 1940;Dumm, 1954;Kraijenhoff van de Leur, 1958;van Schilfgaarde, 1970).…”

Section: Introductionmentioning

confidence: 99%

Transient flow between aquifers and surface water: analytically derived field-scale hydraulic heads and fluxes

Rooij

2012

Hydrol. Earth Syst. Sci.

View full text Add to dashboard Cite

Abstract. The increasing importance of catchment-scale and basin-scale models of the hydrological cycle makes it desirable to have a simple, yet physically realistic model for lateral subsurface water flow. As a first building block towards such a model, analytical solutions are presented for horizontal groundwater flow to surface waters held at prescribed water levels for aquifers with parallel and radial flow. The solutions are valid for a wide array of initial and boundary conditions and additions or withdrawals of water, and can handle discharge into as well as lateral infiltration from the surface water. Expressions for the average hydraulic head, the flux to or from the surface water, and the aquifer-scale hydraulic conductivity are developed to provide output at the scale of the modelled system rather than just point-scale values. The upscaled conductivity is time-variant. It does not depend on the magnitude of the flux but is determined by medium properties as well as the external forcings that drive the flow. For the systems studied, with lateral travel distances not exceeding 10 m, the circular aquifers respond very differently from the infinite-strip aquifers. The modelled fluxes are sensitive to the magnitude of the storage coefficient. For phreatic aquifers a value of 0.2 is argued to be representative, but considerable variations are likely. The effect of varying distributions over the day of recharge damps out rapidly; a soil water model that can provide accurate daily totals is preferable over a less accurate model hat correctly estimates the timing of recharge peaks.

show abstract

Artificially Drained Catchments—From Monitoring Studies towards Management Approaches

Cited by 18 publications

References 11 publications

Geophysical monitoring and reactive transport modeling of ureolytically-driven calcium carbonate precipitation

Geophysical monitoring and reactive transport modeling of ureolytically-driven calcium carbonate precipitation

Impact of the spatial arrangement of land management practices on surface runoff for small catchments

Transient flow between aquifers and surface water: analytically derived field-scale hydraulic heads and fluxes

Contact Info

Product

Resources

About