Selected publications

This review paper by international female experts on urban hydrology identifies gaps in our understanding of how water flows through built landscapes. It focuses on key topics within urban hydrology related to water quantity, incl. runoff and streamflow generation, soils and soil water, groundwater, vegetation, and climate; describes challenges and opportunities in the field of urban hydrology.

The authors introduce a theory for confluence mixing dynamics of shallow flows, in which the mixing process is controlled by two modes: one similar to a wake behind an obstacle and the other similar to a mixing layer between two parallel flows. The findings, supported by field-based experiments, provide insight into different modalities of flow structure controlling mixing at river confluences.

To analyse the influence of vegetation on water partitioning under land management strategies, the authors used stable water isotopes with contrasting land covers and soil types in the Demnitzer Millcreek. The study underlined the need for long-term observations of land use changes and drought-sensitive vegetation to evolve a drought resilient land management considering time lags.

About 20 % of the newly sealed area is not in urban areas, but in rural areas, according to the model calculations of this study. Calculations of nutrient fluxes into water bodies have not taken these new sealings in rural areas into account, because these are often based on land use maps and consider urban areas. As a result, the nutrient loads of water bodies are systematically underestimated. 

The authors mapped and analyzed the literature on the hypothesis of urban biotic homogenization. They identified 225 studies addressing the hypothesis. Half of them investigated homogenization across cities, the other half investigating homogenization within cities. There are strong research biases and thus knowledge gaps in the literature and about 55% of the studies supported the hypothesis.

The authors conducted a sampling campaign of water isotopes, combined with climatic and hydrometric data across an evergreen broad-leaved woodland, to assess event-based changes in water cycling and partitioning. Quantifying the transfer of water in the soil-plant-atmosphere continuum improved the understanding of water cycling and partitioning in an urban woodland in a monsoon humid region.

Fatty acid markers, stable isotopes of C and N, and bacterial communities were investigated in a mesotidal estuary of the Patagonia to assess the Odum’s outwelling hypothesis. Rhodobacterales were likely early colonizers of the outwelled organic matter and the exportation of nutrients and organisms and their essential fatty acids from the wetland was inferred, supporting the findings of Odum.

The research team investigated the vertical oxygen flux through the halocline in the Baltic Sea using high-resolution temperature and oxygen profiles during different seasons. Oxygen transport showed a strong seasonality and was higher in autumn compared to summer and winter. The shoreline regions were responsible for >80% of the total oxygen transport through the halocline.