As groundwater resources are becoming more vulnerable due to the increasing number of contamination sources in developed and developing countries (such as urbanization and agricultural activities), practical actions, strategies and solutions to protect the resource are widely required. The most efficient tool, which helps supporting land use development, while protecting groundwater from contamination, is represented by groundwater vulnerability assessment. European Directives require member states, for the protection of groundwater quality, to assess the current groundwater quality status, detect changes or trends in groundwater quality, assess the threat of deterioration and predict future changes in groundwater quality. In order to cope with the EU requirements, this study focuses on the development of a time-dependent approach, which could take into account both the current groundwater quality status and its changes, assessing groundwater vulnerability to nitrate contamination in the Po Plain area of Lombardy Region, through a Bayesian spatial statistical method (Weights of Evidence). In addition, an innovative dataset to delineate urban areas with satellite scatterometer data (QuikSCAT-DSM) is explored. To evaluate its reliability in groundwater vulnerability assessments, QuikSCAT-DSM dataset is compared with population density and land use derived from aerial images. Results showed that: a) urbanization prevails on agricultural activities in causing the degradation of groundwater quality; b) QuikSCAT-DSM data is a reliable variable to represent urban nitrate sources, with the advantages of a worldwide coverage, a continuous data collection and an adequate resolution; c) the time-dependent approach allows to identify areas both affected by nitrate contamination and characterized by an upward concentration trend of contamination; d) the time-dependent approach allows to determine what could happen to groundwater resources if land use policies are maintained or new ones will be proposed and/or if natural factors are changing under climatic or anthropogenic stresses.

TIME-DEPENDENT METHODS TO EVALUATE THE EFFECTS OF URBAN SPRAWL ON GROUNDWATER QUALITY / S. Stevenazzi ; tutor: M. Masetti, A. Sorichetta ; coordinatore: E. Erba. - : . DIPARTIMENTO DI SCIENZE DELLA TERRA "ARDITO DESIO", 2016 Feb 10. ((28. ciclo, Anno Accademico 2015. [10.13130/stevenazzi-stefania_phd2016-02-10].

TIME-DEPENDENT METHODS TO EVALUATE THE EFFECTS OF URBAN SPRAWL ON GROUNDWATER QUALITY

S. Stevenazzi
2016-02-10

Abstract

As groundwater resources are becoming more vulnerable due to the increasing number of contamination sources in developed and developing countries (such as urbanization and agricultural activities), practical actions, strategies and solutions to protect the resource are widely required. The most efficient tool, which helps supporting land use development, while protecting groundwater from contamination, is represented by groundwater vulnerability assessment. European Directives require member states, for the protection of groundwater quality, to assess the current groundwater quality status, detect changes or trends in groundwater quality, assess the threat of deterioration and predict future changes in groundwater quality. In order to cope with the EU requirements, this study focuses on the development of a time-dependent approach, which could take into account both the current groundwater quality status and its changes, assessing groundwater vulnerability to nitrate contamination in the Po Plain area of Lombardy Region, through a Bayesian spatial statistical method (Weights of Evidence). In addition, an innovative dataset to delineate urban areas with satellite scatterometer data (QuikSCAT-DSM) is explored. To evaluate its reliability in groundwater vulnerability assessments, QuikSCAT-DSM dataset is compared with population density and land use derived from aerial images. Results showed that: a) urbanization prevails on agricultural activities in causing the degradation of groundwater quality; b) QuikSCAT-DSM data is a reliable variable to represent urban nitrate sources, with the advantages of a worldwide coverage, a continuous data collection and an adequate resolution; c) the time-dependent approach allows to identify areas both affected by nitrate contamination and characterized by an upward concentration trend of contamination; d) the time-dependent approach allows to determine what could happen to groundwater resources if land use policies are maintained or new ones will be proposed and/or if natural factors are changing under climatic or anthropogenic stresses.
MASETTI, MARCO
ERBA, ELISABETTA
groundwater vulnerability; statistical methods; urban areas; remote sensing; nitrate
Settore GEO/05 - Geologia Applicata
TIME-DEPENDENT METHODS TO EVALUATE THE EFFECTS OF URBAN SPRAWL ON GROUNDWATER QUALITY / S. Stevenazzi ; tutor: M. Masetti, A. Sorichetta ; coordinatore: E. Erba. - : . DIPARTIMENTO DI SCIENZE DELLA TERRA "ARDITO DESIO", 2016 Feb 10. ((28. ciclo, Anno Accademico 2015. [10.13130/stevenazzi-stefania_phd2016-02-10].
Doctoral Thesis
File in questo prodotto:
File Dimensione Formato  
phd_unimi_R10226.pdf

accesso aperto

Tipologia: Tesi di dottorato completa
Dimensione 9.54 MB
Formato Adobe PDF
9.54 MB Adobe PDF Visualizza/Apri
Pubblicazioni consigliate

Caricamento pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/359710
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact