Lisa Angermann

Universität Potsdam

Individual approaches to observe water dynamics across our landscape, from the land surface to groundwater, are many though they individually only provide glimpses into the real world due to their specific space–time scales. Comprehensive integration across all available observations is still largely lacking, limiting both our ability to reduce sci...

Cosmic-ray neutron sensing (CRNS) allows for the estimation of root-zone soil water content (SWC) at the scale of several hectares. In this paper, we present the data recorded by a dense CRNS network operated from 2019 to 2022 at an agricultural research site in Marquardt, Germany – the first multi-year CRNS cluster. Consisting, at its core, of eig...

Cosmic-ray neutron sensing (CRNS) allows for the estimation of root-zone soil water content (SWC) at the scale of several hectares. In this paper, we present the data recorded by a dense CRNS network operated from 2019 to 2022 at an agricultural research site in Marquardt, Germany – the first multi-year CRNS cluster. Consisting, at its core, of eig...

The concept of hydrologic connectivity summarizes all flow processes that link separate regions of a landscape. As such, it is a central theme in the field of catchment hydrology, with influence on neighboring disciplines such as ecology and geomorphology. It is widely acknowledged to be an important key in understanding the response behavior of a...

The study deals with the identification and characterization of rapid subsurface flow structures through pedo- and geo-physical measurements and irrigation experiments at the point, plot and hillslope scale. Our investigation of flow-relevant structures and hydrological responses refers to the general interplay of form and function, respectively. T...

The phrase form and function was established in architecture and biology and refers to the idea that form and functionality are closely correlated, influence each other, and co-evolve. We suggest transferring this idea to hydrological systems to separate and analyze their two main characteristics: their form, which is equivalent to the spatial stru...

Sustainable water resources management needs to be based on sound process understanding. This is especially true in a changing world, where boundary conditions change and models calibrated to the status quo are no longer helpful. There is a general agreement in the hydrologic community that we are in need of a better process understanding and that...

Rapid subsurface flow in structured soils facilitates fast vertical and lateral redistribution of event water. Despite their significance and omnipresence the related processes are challenging hydrological exploration, monitoring, modeling and theory. One reason for this is that flow processes at high velocities are difficult to observe in the subs...

Preferential flow is omnipresent in natural systems. It links multiple scales from single pores to entire hillslopes and potentially influences the discharge dynamics of a catchment. However, there is still a lack of appropriate monitoring techniques and thus, process understanding. In this study, a promising combination of 2D time-lapse ground-pen...

Hydrological modeling is commonly based on a discharge calibration. This approach, however, is often insufficient to properly reproduce conditions that exceed the range of calibrated conditions and is therefore inadequate for predicting reactions to a changing environment. Small headwater catchments are often characterized by manifold morphological...

Hyporheic zone processes can have significant impact on groundwater and surface water resources. Detailed knowledge of exchange flow patterns is crucial for understanding the ecohydrological and biogeochemical functioning of river corridors. In particular, small-scale hyporheic exchange flow is still poorly understood, partially because of the lack...

The hyporheic zone is strongly influenced by the adjacent surface water and groundwater systems. It is subject to hydraulic head and pressure fluctuations at different space and time scales, causing dynamic and heterogeneous flow patterns. These patterns are crucial for many biogeochemical processes in the shallow sediment and need to be considered...

The mixing of groundwater (GW) and surface water (SW) can have substantial impact on the transformation of solutes transported between aquifer and river. The assessment of biogeochemical cycling at reactivity hotspots as the aquifer-river interface and its implications for GW and SW quality require detailed understanding of the complex patterns of...

The riverine system represents a continuum of surface water (SW), shallow groundwater (GW) and the interconnecting hyporheic zone (HZ). Within this conceptual model, the HZ fulfills important ecological and biogeochemical functions caused by the high specific surface of sediment, the abundance of organic matter and steep and dynamic gradients in te...

Heat as a natural tracer is commonly used to evaluate groundwater (GW) surface water (SW) interactions in the field. Seasonal temperature differences between GW and SW can be used to qualitatively map areas of preferential exchange. Under certain assumptions analytical solutions to the heat transport equations allow a simple quantification of excha...

The mixing of groundwater (GW) and surface water (SW) can have substantial impact on the transformation of solutes transported at the aquifer-river interface. The assessment of interface reactivity and its implications for GW and SW quality requires detailed understanding of the complex patterns of GW-SW exchange fluxes and residence time distribut...

The hyporheic zone (HZ) has the capability to eliminate and attenuate nutrients and contaminants in riverine systems. Biogeochemical reactions and the potential elimination of contaminants are strongly controlled by the flow paths and dynamics in the HZ. Nevertheless, an easily applicable method for the field determination of flow patterns in the H...

Spatially distributed knowledge of exchange fluxes between groundwater and surface water at aquifer-river interfaces is essential to understand potential contamination pathways as well as estimate the natural attenuation functions of hyporheic streambed environments. Current methods of identifying aquifer-river exchange fluxes are limited to either...

The ‘hyporheic zone’ or ‘interstitial’ characterises an area of intensive groundwater and surface water mixing within streambed sediments. Its physical conditions, as for instance the hydraulic conductivity and residence time, control fluxes and exchange rates between groundwater and surface water. Because of its often steep and dynamic redox gradi...

The mixing of groundwater and surface water in hyporheic zones often coincides high redox reactivity and chemical transformation potential. Depending on redox conditions and reaction types, hyporheic mixing of groundwater and surface water can lead to either attenuation or enrichment of pollutants or nutrients with diametrical implications for stre...

The hyporheic interstitial is a hydraulically dynamic and biogeochemical active interface between surface water and groundwater. Depending on the hydraulic boundary conditions and the connectivity with the adjacent aquifer, infiltrating and exfiltrating water pass through it. In addition to those larger scale flow patterns flow at the centimetre sc...