| Home | [1–10] << 11 12 13 14 15 16 17 18 19 20 >> [21–30] |
|
| Records | |||||
|---|---|---|---|---|---|
| Author | Li*, L.; Zhou, H.; Franssen, H.J.H.; Gómez-Hernández, J.J. | ||||
| Title | Groundwater flow inverse modeling in non-MultiGaussian media: performance assessment of the normal-score Ensemble Kalman Filter | Type | Journal Article | ||
| Year | 2012 | Publication | Hydrol. Earth Syst. Sci. | Abbreviated Journal | |
Volume  |
16 | Issue | 2 | Pages | 573-590 |
| Keywords | |||||
| Abstract | |||||
| Address | |||||
| Corporate Author | Thesis | ||||
| Publisher | Copernicus GmbH | Place of Publication | Editor | ||
| Language | Summary Language | Original Title | |||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | ISBN | Medium | |||
| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | CUT @ phaedon.kyriakidis @ Li2012 | Serial | 154 | ||
| Permanent link to this record | |||||
| Author | Mongelli, G.; Monni, S.; Oggiano, G.; Paternoster, M.; Sinisi, R. | ||||
| Title | Tracing groundwater salinization processes in coastal aquifers: a hydrogeochemical and isotopic approach in the Na-Cl brackish waters of northwestern Sardinia, Italy | Type | Journal Article | ||
| Year | 2013 | Publication | Hydrology and Earth System Sciences | Abbreviated Journal | |
| Volume |
17 | Issue | 7 | Pages | 2917-2928 |
| Keywords | salinization, isotopes, Sardinia | ||||
| Abstract | Throughout the Mediterranean, salinization threatens water quality, especially in coastal areas. This salinization is the result of concomitant processes related to both seawater intrusion and water–rock interaction, which in some cases are virtually indistinguishable. In the Nurra region of northwestern Sardinia, recent salinization related to marine water intrusion has been caused by aquifer exploitation. However, the geology of this region records a long history from the Palaeozoic to the Quaternary, and is structurally complex and comprises a wide variety of lithologies, including Triassic evaporites. Determining the origin of the saline component of the Jurassic and Triassic aquifers in the Nurra region may provide a useful and more general model for salinization processes in the Mediterranean area, where the occurrence of evaporitic rocks in coastal aquifers is a common feature. In addition, due to intensive human activity and recent climatic change, the Nurra has become vulnerable to desertification and, in common with other Mediterranean islands, surface water resources periodically suffer from severe shortages. With this in mind, we report new data regarding brackish and surface waters (outcrop and lake samples) of the Na-Cl type from the Nurra region, including major ions and selected trace elements (B, Br, I, and Sr), in addition to isotopic data including δ18O, δD in water, and δ34S and δ18O in dissolved SO4. To identify the origin of the salinity more precisely, we also analysed the mineralogical and isotopic composition of Triassic evaporites. The brackish waters have Cl contents of up to 2025 mg L−1 , and the ratios between dissolved ions and Cl, with the exception of the Br / Cl ratio, are not those expected on the basis of simple mixing between rainwater and seawater. The δ18O and δD data indicate that most of the waters fall between the regional meteoric water line and the global meteoric water line, supporting the conclusion that they are meteoric in origin. A significant consequence of the meteoric origin of the Na-Cl-type water studied here is that the Br / Cl ratio, extensively used to assess the origin of salinity in fresh water, should be used with care in carbonate aquifers that are near the coast. Overall, δ34S and δ18O levels in dissolved SO4 suggest that water–rock interaction is responsible for the Na-Cl brackish composition of the water hosted by the Jurassic and Triassic aquifers of the Nurra, and this is consistent with the geology and lithological features of the study area. Evaporite dissolution may also explain the high Cl content, as halite was detected within the gypsum deposits. Finally, these Na-Cl brackish waters are undersaturated with respect to the more soluble salts, implying that in a climate evolving toward semi-arid conditions, the salinization process could intensify dramatically in the near future. | ||||
| Address | |||||
| Corporate Author | Thesis | ||||
| Publisher | Copernicus | Place of Publication | Editor | ||
| Language | en | Summary Language | Original Title | ||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | ISBN | Medium | |||
| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | THL @ christoph.kuells @ hess-17-2917-2013 | Serial | 79 | ||
| Permanent link to this record | |||||
| Author | Ola, I.; Drebenstedt, C.; Burgess, R.M.; Mensah, M.; Hoth, N.; Külls, C. | ||||
| Title | Remediating Oil Contamination in the Niger Delta Region of Nigeria: Technical Options and Monitoring Strategies | Type | Journal Article | ||
| Year | 2024 | Publication | The Extractive Industries and Society | Abbreviated Journal | |
| Volume |
17 | Issue | Pages | 101405 | |
| Keywords | |||||
| Abstract | |||||
| Address | |||||
| Corporate Author | Thesis | ||||
| Publisher | Elsevier | Place of Publication | Editor | ||
| Language | Summary Language | Original Title | |||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | ISBN | Medium | |||
| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | THL @ christoph.kuells @ ola2024remediating | Serial | 224 | ||
| Permanent link to this record | |||||
| Author | Jesús Carrera, Juan J. Hidalgo, Luit J. Slooten, Enric Vázquez-Suñé | ||||
| Title | Computational and conceptual issues in the calibration of seawater intrusion models | Type | Journal Article | ||
| Year | 2010 | Publication | Hydrogeology Journal | Abbreviated Journal | |
| Volume |
18 | Issue | Pages | 131-145 | |
| Keywords | Coastal aquifers; Inverse modelling; Numerical modeling | ||||
| Abstract | The inverse problem of seawater intrusion(SWI) is reviewed. It represents a challenge because of both conceptual and computational difficulties and because coastal aquifer models display many singularities:(1) head measurements need to be complemented with density information; (2) salinity concentration data are very sensitive to flow within the borehole. Data problems can be reduced by incorporating the measurement process within model calibration; (3) SWI models are extremely sensitive to aquifer bottom topography; (4) the initial conditions may be far from steady state and depend on the location and type of sea-aquifer connection. Problems with aquifer geometry and initial conditions can be addressed by parameterization, which allows for modification during inversion. The four sets of difficulties can be partly overcome by using tidal response and electrical conductivity data, which are highly informative and provide extensive coverage. Still, SWI inversion is extremely demanding from a computation point of view. Computational improvements are discussed. |
||||
| Address | J. Carrera : J. J. Hidalgo ()) : L. J. Slooten : E. Vázquez-Suñé, Spain e-mail: juan.hidalgo@upc.edu | ||||
| Corporate Author | Institute of Environmental Ass Institute of Environmental Assessment and Water Research (IDAEA), Spanish National Research Council (CSIC), Jordi Girona 18, 08034 Barcelona, e-mail: juan.hidalgo@upc.edu | Thesis | |||
| Publisher | IAH | Place of Publication | Editor | Springer | |
| Language | English | Summary Language | Original Title | ||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | 1431- 2174 (online: 1435-0157) | ISBN | Medium | ||
| Area | 'Hydrogeology'; 'groundwater modelling' | Expedition | Conference | ||
| Notes | Approved | yes | |||
| Call Number | MGRE @ redha.menani @ | Serial | 51 | ||
| Permanent link to this record | |||||
| Author | Nas, B. | ||||
| Title | Geostatistical approach to assessment of spatial distribution of groundwater quality | Type | Journal Article | ||
| Year | 2009 | Publication | Polish J. of Environ. Stud. | Abbreviated Journal | |
| Volume |
18 | Issue | 6 | Pages | 1073-1082 |
| Keywords | |||||
| Abstract | |||||
| Address | |||||
| Corporate Author | Thesis | ||||
| Publisher | Place of Publication | Editor | |||
| Language | Summary Language | Original Title | |||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | ISBN | Medium | |||
| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | CUT @ phaedon.kyriakidis @ nas2009 | Serial | 109 | ||
| Permanent link to this record | |||||