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Statistical Evaluation of Saline Groundwater Quality Data
Art der Abschlussarbeit
Master
Autoren
- Zähringer, Janek
Betreuer
- M.Sc. Hanna Rosentreter
- Prof. Dr. André Lerch
Weitere Betreuer
JProf. Marc Walther
Abstract
Saltwater intrusion is causing salinization of groundwater resources all over the world. Coastal aquifers are especially threatened by this process due to high population densities in coastal areas, leading to overexploitation of the aquifer, and the sea-level rise caused by climate change. Overexploitation of the groundwater and sea-level rise are the most common causes of saltwater intrusion. The objective of this study is to create a database of global publications on saltwater intrusion to enable the analysis of similarities in intrusion and salinization processes. For this purpose, a thorough literature review was performed. This review showed that most studies investigating saltwater intrusion into coastal aquifers focused on semi-arid to arid climate zones. These areas are especially vulnerable to intrusion of saltwater due to their generally low aquifer recharge. Nevertheless, research is not limited to these climate zones and studies on saltwater intrusion in humid climate conditions, show that this is indeed a global issue. Furthermore, in the course of the literature review it got apparent that some areas, such as South America or Sub-Sahara Africa, are getting less attention on this topic leading to a scarce data situation. Statistical analysis of the collected water quality data, with multiple linear regression models, investigated the correlation between the major single ions in the groundwater, their distance from the coast and the sampled well depth for the combined dataset of all publications. Additionally, the dataset was analysed with Self-Organizing Maps, an unsupervised machine-learning technique, to gain further insights into the intrusion process. This method is a promising tool for future research on saltwater intrusion since it is able to include the multi-dimensional variables needed to simulate and understand the intrusion process. Understanding the processes and driving forces of saltwater intrusion is crucial in order to design possible methods to counteract this threat to the vital resource of groundwater.
Zugeordnete Forschungsschwerpunkte
- Membranverfahren der Trink- und Prozesswasseraufbereitung und Abwasserbehandlung
Zugeordnete Forschungsprojekte
- Salzwasseraufbereitung zur Injektion in hydraulischen Barrieren
Schlagwörter
Saltwater intrusion; Salinization; Coastal aquifers; Correlation of major groundwater constituents; Chemical indicators; Statistical analysis; Self-Organizing Maps
Berichtsjahr
2019