A5014424390- Hydrology and Watershed Management Studies
- Groundwater flow and contamination studies
- Hydrology and Sediment Transport Processes
- Soil and Water Nutrient Dynamics
- Plant Water Relations and Carbon Dynamics
- Soil erosion and sediment transport
- Flood Risk Assessment and Management
- Soil and Unsaturated Flow
- Tree-ring climate responses
- Cryospheric studies and observations
- Groundwater and Isotope Geochemistry
- Diatoms and Algae Research
- Climate variability and models
- Geology and Paleoclimatology Research
- Freshwater macroinvertebrate diversity and ecology
- Hydrological Forecasting Using AI
- Peatlands and Wetlands Ecology
- Fish Ecology and Management Studies
- Urban Stormwater Management Solutions
- Integrated Water Resources Management
- Aquatic Ecosystems and Phytoplankton Dynamics
- Forest ecology and management
- Hydrology and Drought Analysis
- Soil Carbon and Nitrogen Dynamics
- Aquatic Invertebrate Ecology and Behavior
University of Bonn
2021-2025
Universitätsmedizin Göttingen
2025
Luxembourg Institute of Science and Technology
2014-2024
University of Wisconsin–Madison
2024
Texas A&M University
2024
Okanagan University College
2024
University of British Columbia
2024
The University of Western Australia
2024
University of the West of England
2022
University of Saskatchewan
2013-2016
Abstract The movement of water, matter, organisms, and energy can be altered substantially at ecohydrological interfaces, the dynamic transition zones that often develop within ecotones or boundaries between adjacent ecosystems. Interdisciplinary research over last two decades has indicated interfaces are “hot spots” ecological, biogeochemical, hydrological processes may provide refuge for biota during extreme events. Ecohydrological have significant impact on global biogeochemical cycles,...
Abstract. In this commentary, we summarize and build upon discussions that emerged during the workshop “Isotope-based studies of water partitioning plant–soil interactions in forested agricultural environments” held San Casciano Val di Pesa, Italy, September 2017. Quantifying understanding how cycles through Earth's critical zone is important to provide society policymakers with scientific background manage resources sustainably, especially considering ever-increasing worldwide concern about...
Abstract The bedrock controls on catchment mixing, storage, and release have been actively studied in recent years. However, it has difficult to find neighbouring catchments with sufficiently different clean expressions of geology do comparative analysis. Here, we present new data for 16 nested (0.45 410 km 2 ) the Alzette River basin (Luxembourg) that span a range mixed schists, phyllites, sandstones, quartzites quantify relationships between permeability metrics water storage release. We...
Abstract Water transit time is now a standard measure in catchment hydrological and ecohydrological research. The last comprehensive review of modeling approaches was published 15+ years ago. But since then the field has largely expanded with new data, theory applications. Here, we these developments focus on water‐age‐balance data‐based approaches. We discuss compare methods including StorAge‐Selection functions, well/partially mixed compartments, water age tracking through spatially...
Abstract. The mechanisms allowing the rapid release of stored water to streams are poorly understood. Here we use a tile-drained field site combine macroporous soils at hillslope scale with advantage least partly controlled lower boundary conditions. We performed series three irrigation experiments combining hydrometric measurements stable isotope and bromide tracers better understand macropore–matrix interactions processes scale. Stable concentrations were monitored in water, tile-drain...
Abstract Catchment travel times integrate the multitude of hydrological flow processes and provide insights into catchment functioning. StorAge Selection (SAS) functions describe how residence water in storage are related to outflows. As such, SAS useful summarize transport catchments ideal simulate outflows concentrations various solutes tracers. Recent studies suggested that using one probability distribution function (pdf) for may not account all systems. In this study we introduced a...
ABSTRACT Due to its high spatial and temporal variability, preferential flow is difficult measure quantify. Earthworms create macropores that provide common pathways for flow. Therefore in this article, we link earthworm abundance macropore numbers hydrological effectiveness, with the future aim use species distribution models of earthworms parameterization are generally categorized into three ecological types varying burrowing behaviour, resulting a different impact on soil processes....
Abstract Recent studies on the relationships between catchment storage and water ages using Travel Time Distributions (TTDs), Residence (RTDs), StorAge Selection (SAS) functions have led to hypothesis that streamflow preferentially mobilizes younger when is high. This so‐called “Inverse Storage Effect” (ISE) needs further evaluation in more catchments with diverse climates physiographical features. In this work, we assessed validity of ISE WS10 (H. J. Andrews forest, Oregon, USA), a forested...
The highly dynamic processes within a hillslope-riparian-stream (HRS) continuum are known to affect streamflow generation, but yet not fully understood. Within this study, we simulated headwater HRS in western Luxembourg with an integrated hydrologic surface subsurface model (HydroGeoSphere). was setup thorough consideration of catchment-specific attributes and performed multicriteria evaluation (4 years) special focus on the temporally varying spatial patterns saturation. We used portable...
Abstract Time variant catchment transit time distributions are fundamental descriptors of function but yet not fully understood, characterized, and modeled. Here we present a new approach for use with standard runoff tracer data sets that is based on tracking age information mixing. Our able to deal nonstationarity flow paths mixing, an irregular shape the distribution. The extracts mixing from stable isotope series instead prior assumptions or We first demonstrate proof concept artificial...
Abstract Hillslopes exert critical controls on the quality and quantity of downstream waters. To understand model dominant headwater catchment processes, we need to estimate relative importance different runoff generation processes. In this work analyze published data from studies 17 hillslopes a range landscapes better role interflow, that is, shallow lateral subsurface flow moving over layer impeding percolation, in streamflow generation. For each slope, calculated downslope interflow...
Abstract. Catchment travel time distributions (TTDs) are an efficient concept for summarizing the time-varying 3D transport of water and solutes towards outlet in a single function age estimating catchment storage by leveraging information contained tracer data (e.g., deuterium 2H tritium 3H). It is argued that preferential use stable isotopes O H as tracers, compared to tritium, has truncated our vision streamflow TTDs, meaning long tails distribution associated with old tend be neglected....
The substantial tree-to-tree variability of transpiration poses a major challenge to reliable stand-scale quantification transpiration. diameter at breast height (DBH) and landscape characteristics have been identified as drivers variability, but it remains unclear if their control on sap velocity varies between species-specific water-use environmental conditions. We hypothesized that controls are specie-specific, such the temporal dynamic relative importance. To test our hypotheses, we used...
Abstract In river systems, headwater networks contain the vast majority of stream length. Thus, climate and land‐use change in headwaters have disproportionate impacts on downstream ecosystems societies that rely them. Despite decades hydrological research, difficulties observing properties across scales means scientific knowledge processes driving streamflow remains limited. However, recent emergence two complementary technologies, drones thermal infrared (TIR) remote sensing, has potential...
Abstract Rapid flow in connected preferential paths is crucial for fast transport of water and solutes through soils, especially at tile‐drained field sites. In the present study, we propose a spatially explicit approach to represent worm burrows as structures realistic geometry, high conductivity low retention capacity two‐dimensional physically based model. We show that this allows successful prediction tile‐drain discharge patterns soil observed during irrigation hillslope Weiherbach...
Abstract. The time and geographic sources of streamwater in low-relief watersheds are poorly understood. This is partly due to the difficult combination low runoff coefficients often damped isotopic signals precluding traditional hydrograph separation convolution integral approaches. Here we present a dual-isotope approach involving 18O 2H water low-angle forested watershed determine source components then build conceptual model streamflow generation. We focus on three headwater lowland...
Core Ideas We tested a range of dual‐permeability parameterizations at plot and catchment scale. Well‐performing parameters scale did not clearly improve simulation. Vertical preferential flow was important for simulating plot‐scale observations. At scale, it appeared more to consider fast lateral subsurface flow. This showed that different nonuniform processes are critical scales. Despite ubiquitous field observations processes, paths rarely considered in hydrological models, especially In...
Abstract The role of landscape topography in mediating subsurface water availability and ultimately tree transpiration is still poorly understood. To assess how hillslope position affects use, we coupled sap velocity with xylem isotope measurements a temperate beech‐oak forest along transect Luxembourg. We generally observed greater velocities at the upslope locations trees from average‐sized trees, suggesting presence more suited growing conditions. found lower difference among positions...
Abstract The Weierbach experimental catchment (0.45 km 2 ) is the most instrumented and studied sub‐catchment in Alzette River basin Luxembourg. Within last decade, it has matured towards an interdisciplinary critical zone observatory focusing on a better understanding of hydrological hydro‐geochemical processes. embedded elevated sub‐horizontal plateau, characterized by slate bedrock representative Ardennes Massif. Its climate semi‐marine, with precipitation being rather evenly distributed...