Abstract A preliminary hydrostratigraphic model of the
city of Rome (Italy) was completed through the analysis
of geological and hydrogeological data, and by using
geographic information system (GIS)-based operations.
The complex lithostratigraphic setting of a local Quaternary
volcano-sedimentary multilayer was simplified into
hydrostratigraphic complexes considering textural properties
of terrains and hydraulic conductivity values. The
Tiber River Valley, in the middle of the urban area, was
analyzed separately from the surrounding areas. GIS tools
were used in a multiple-step procedure to reconstruct the
geometry of bounding surfaces of the main hydrostratigraphic
complexes. Particular care was given to the
characterization of a confined gravelly aquifer lying at
the base of the upper Pleistocene–Holocene alluvium that
fills the Tiber Valley. Updated isobaths and thickness
maps of this layer were produced. Three-dimensional
reconstruction identifies areas of potential recharge between
the alluvium aquifer and the surrounding hydrostratigraphic
complexes. In the central sector of the city,
the gravel deposits are laterally confined by a thick
aquitard corresponding to the Pliocene clayey bedrock of
the city; in contrast, a potential recharge area can be
hypothesized in the northern areas, where the upper
Pleistocene–Holocene valley cross cuts the Paleotiber
Graben, filled with older and highly permeable gravels
and clays.
Keywords Hydrostratigraphic modeling . Urban
groundwater . Geographic information systems . Italy
Abstract A preliminary hydrostratigraphic model of thecity of Rome (Italy) was completed through the analysisof geological and hydrogeological data, and by usinggeographic information system (GIS)-based operations.The complex lithostratigraphic setting of a local Quaternaryvolcano-sedimentary multilayer was simplified intohydrostratigraphic complexes considering textural propertiesof terrains and hydraulic conductivity values. TheTiber River Valley, in the middle of the urban area, wasanalyzed separately from the surrounding areas. GIS toolswere used in a multiple-step procedure to reconstruct thegeometry of bounding surfaces of the main hydrostratigraphiccomplexes. Particular care was given to thecharacterization of a confined gravelly aquifer lying atthe base of the upper Pleistocene–Holocene alluvium thatfills the Tiber Valley. Updated isobaths and thicknessmaps of this layer were produced. Three-dimensionalreconstruction identifies areas of potential recharge betweenthe alluvium aquifer and the surrounding hydrostratigraphiccomplexes. In the central sector of the city,the gravel deposits are laterally confined by a thickaquitard corresponding to the Pliocene clayey bedrock ofthe city; in contrast, a potential recharge area can behypothesized in the northern areas, where the upperPleistocene–Holocene valley cross cuts the PaleotiberGraben, filled with older and highly permeable gravelsและ claysคำสำคัญ Hydrostratigraphic โมเดล เมืองน้ำบาดาล ระบบสารสนเทศภูมิศาสตร์ อิตาลี
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