Abstract
Different researchers have shown that rising global sea levels have to be expected
in the course of climate change. Long-life infrastructures such as sewer systems
therefore face new challenges in coastal regions. The influence of rising sea level on
sewer systems has been acknowledged but has not yet been described in detail or
even quantified. In the present study, a correlation between sea level fluctuations
and wastewater conductivity will be investigated. By implementing mixture
calculations this correlation will be used to develop an empirical model to predict
wastewater conductivity out of sea level data and flow measurements. The results
of these calculations for the municipality of Gothenburg show that the theoretical
seawater inflow would not influence the treatment capacity of the wastewater
treatment plant (WWTP) negatively. However, it became evident that seawater
inflow is an existing process in coastal regions like Gothenburg. Smaller WWTPs
might not be able to compensate these inflows. The developed model can therefore
be a useful tool to estimate possible weaknesses of a system. Future research lies
mainly in the improvement and increase in robustness of the model. By combining
the improved model with climate scenarios, future challenges can be identified and
the planning process for sewer systems can be improved.
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