The general purpose of this paper is to prove the capability of numerical models in management of groundwater resources and in particular for achieve forecast scenarios to evaluate the impacts of climate change on them. A large-scale approach was chosen. The active domain of the study area (active cells) cover approximately 2,300 km2 with 45,925 cells. Vertically, the area was divided into 12 layers to allow a good lithological and hydrogeological discretization. Thickness and geometry of layers was defined on the 3D knowledge of hydrogeological complexes. Climatic, hydrological, geological, hydrological and agricultural acquisitions were processing and became the input for a variable-density flow and transport numerical modelling. MODFLOW and SEAWAT was used. Qualitative and quantitative groundwater trends from 1930 to 2060 was so defined. To achieve predictive scenarios for the management of coastal groundwater resources could be necessary take into account climate changes, with regard particularly to temperature, precipitation, sea level and seawater salinity. The purpose was assessing the effects of climate change on groundwater availability and quality. Results show an important piezometric decrease and an increment of seawater intrusion and in consequence a deterioration of groundwater resource. For these requires different scenarios of pumping were considered to study and manage the reaction of the aquifer with reference to seawater intrusion effects. In others words, the same pumping was redistributed in the different areas consider a quality criterion, simple to use especially in those areas where policy of groundwater resource scientifically based is absent.
A large scale model approach finalise to management of resource: the case of Salento (South Italy)
Polemio M;Romanazzi A
2014
Abstract
The general purpose of this paper is to prove the capability of numerical models in management of groundwater resources and in particular for achieve forecast scenarios to evaluate the impacts of climate change on them. A large-scale approach was chosen. The active domain of the study area (active cells) cover approximately 2,300 km2 with 45,925 cells. Vertically, the area was divided into 12 layers to allow a good lithological and hydrogeological discretization. Thickness and geometry of layers was defined on the 3D knowledge of hydrogeological complexes. Climatic, hydrological, geological, hydrological and agricultural acquisitions were processing and became the input for a variable-density flow and transport numerical modelling. MODFLOW and SEAWAT was used. Qualitative and quantitative groundwater trends from 1930 to 2060 was so defined. To achieve predictive scenarios for the management of coastal groundwater resources could be necessary take into account climate changes, with regard particularly to temperature, precipitation, sea level and seawater salinity. The purpose was assessing the effects of climate change on groundwater availability and quality. Results show an important piezometric decrease and an increment of seawater intrusion and in consequence a deterioration of groundwater resource. For these requires different scenarios of pumping were considered to study and manage the reaction of the aquifer with reference to seawater intrusion effects. In others words, the same pumping was redistributed in the different areas consider a quality criterion, simple to use especially in those areas where policy of groundwater resource scientifically based is absent.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
