Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1002/2016WR018814
Titel (primär) Impact of topography on groundwater salinization due to ocean surge inundation
Autor Yu, X.; Yang, J.; Graf, T.; Koneshloo, M.; O'Neal, M.A.; Michael, H.A.
Quelle Water Resources Research
Erscheinungsjahr 2016
Department HDG
Band/Volume 52
Heft 8
Seite von 5794
Seite bis 5812
Sprache englisch
Keywords ocean surge; HydroGeoSphere; groundwater; salinization; topography
UFZ Querschnittsthemen RU2;
Abstract Sea-level rise and increases in the frequency and intensity of ocean surges caused by climate change are likely to exacerbate adverse effects on low-lying coastal areas. The landward flow of water during ocean surges introduces salt to surficial coastal aquifers and threatens groundwater resources. Coastal topographic features (e.g., ponds, dunes, barrier islands, and channels) likely have a strong impact on overwash and salinization processes, but are generally highly simplified in modeling studies. To understand topographic impacts on groundwater salinization, we modeled a theoretical overwash event and variable-density groundwater flow and salt transport in 3-D using the fully coupled surface and subsurface numerical simulator, HydroGeoSphere. The model simulates the coastal aquifer as an integrated system considering overland flow, coupled surface and subsurface exchange, variably saturated flow, and variable-density groundwater flow. To represent various coastal landscape types, we simulated both synthetic fields and real-world coastal topography from Delaware, USA. The groundwater salinization assessment suggested that the topographic connectivity promoting overland flow controls the volume of aquifer that is salinized. In contrast, the amount of water that can be stored in surface depressions determines the amount of seawater that infiltrates the subsurface and the time for seawater to flush from the aquifer. Our study suggests that topography has a significant impact on groundwater salinization due to ocean surge overwash, with important implications for coastal land management and groundwater vulnerability assessment.
dauerhafte UFZ-Verlinkung https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=18031
Yu, X., Yang, J., Graf, T., Koneshloo, M., O'Neal, M.A., Michael, H.A. (2016):
Impact of topography on groundwater salinization due to ocean surge inundation
Water Resour. Res. 52 (8), 5794 - 5812 10.1002/2016WR018814