A5089726213- Soil and Water Nutrient Dynamics
- Hydrology and Watershed Management Studies
- Hydrology and Sediment Transport Processes
- Groundwater flow and contamination studies
- Soil erosion and sediment transport
- Water Quality Monitoring Technologies
- Smart Materials for Construction
- Analytical Chemistry and Sensors
- Water Quality Monitoring and Analysis
- Plant Water Relations and Carbon Dynamics
- Forest Ecology and Biodiversity Studies
- Fish Ecology and Management Studies
- Peatlands and Wetlands Ecology
- Tree-ring climate responses
- Geotechnical and Geomechanical Engineering
- Botany and Plant Ecology Studies
- Geographic Information Systems Studies
- Wastewater Treatment and Nitrogen Removal
- Drilling and Well Engineering
- Time Series Analysis and Forecasting
- Geophysical and Geoelectrical Methods
- Agriculture, Soil, Plant Science
- Fire effects on ecosystems
- Flow Measurement and Analysis
- Forest Management and Policy
Helmholtz Centre for Environmental Research
2012-2025
Supply Chain Competence Center (Germany)
2013-2016
Bernstein Center for Computational Neuroscience Tübingen
2013
University of Tübingen
2013
[1] Exchange of water and solutes across the stream-sediment interface is an important control for biogeochemical transformations in hyporheic zone (HZ). In this paper, we investigate interplay between turbulent stream flow HZ pool-riffle streams under various ambient groundwater conditions. Streambed pressures, derived from a computational fluid dynamics (CFD) model, are assigned at top fluxes bottom model domain represent losing gaining Simulations different Reynolds numbers (Re)...
Abstract At the interface between stream water, groundwater, and hyporheic zone (HZ), important biogeochemical processes that play a crucial role in fluvial ecology occur. Solutes infiltrate into HZ can react with each other possibly also upwelling solutes from groundwater. In this study, we systematically evaluate how variations of gaining losing conditions, discharge, pool‐riffle morphology affect aerobic respiration (AR) denitrification (DN) HZ. For purpose, computational fluid dynamics...
Abstract Hyporheic exchange transports solutes into the subsurface where they can undergo biogeochemical transformations, affecting fluvial water quality and ecology. A three‐dimensional numerical model of a natural in‐stream gravel bar (20 m × 6 m) is presented. Multiple steady state streamflow simulated with computational fluid dynamics code that sequentially coupled to reactive transport groundwater via hydraulic head distribution at streambed. Ambient flow considered by scenarios...
Abstract Improved understanding of stream solute transport requires meaningful comparison processes across a wide range discharge conditions and spatial scales. At reach scales where tracer tests are commonly used to assess behavior, such is still confounded due the challenge separating dispersive transient storage from influence advective timescale that varies with length. To better resolve interpretation these field‐based observations, we conducted recurrent conservative along 1 km study...
Abstract Floodplain forests are currently undergoing substantial reorganization processes due to the combined effects of management-induced altered hydrological conditions, climate change and novel invasive pathogens. Nowadays, ash dieback is one most concerning diseases affecting European floodplain forests, causing tree mortality threatening loss dominant key species hardwood forest, Fraxinus excelsior . Understanding how increased light availability caused by pathogen-driven in...
Abstract Over the last 40 years, a growing number of restoration projects have been implemented to improve ecological conditions highly degraded rivers and their floodplains. Despite considerable investment in these projects, information is still limited about effectiveness success such river measures, mainly due lack standardised interdisciplinary assessment approaches. During project ‘Wilde Mulde—Restoration dynamic riverine landscape Central Germany’, we hydromorphological measures...
<title>Abstract</title> Floodplain forests are currently undergoing substantial reorganization processes due to the combined effects of management-induced altered hydrological conditions, climate change and novel invasive pathogens. Nowadays, ash dieback is one most concerning diseases affecting temperate floodplain forests, causing tree mortality threatening loss dominant key species hardwood forest, <italic>Fraxinus excelsior</italic>. Understanding how increased light availability caused...
Abstract. Spatial patterns of water flux in the stream bed are controlled by distribution hydraulic conductivity, bedform-induced head gradients and connectivity to adjoining groundwater system. The fluxes vary over time driven short-term flood events or seasonal variations flow level. Variations electrical conductivity (EC) used as a natural tracer detect transient travel times velocities an in-stream gravel bar. We present method estimate between measuring locations bar non-linearly...
Abstract Aerobic respiration is an important component of in‐stream metabolism. The larger part occurs in the streambed, where it difficult to directly determine actual rates. Existing methods for determining are based on indirect estimates from whole‐stream metabolism or provide time invariant results estimated oxygen consumption measurements enclosed chambers that do not account influence hydrological changes. In this study we demonstrate a simple method time‐variable hyporheic...
Optical sensing technologies provide opportunities for in situ oxygen capable of capturing the whole range spatial and temporal variability. We developed a miniaturized Distributed Oxygen Sensor ("mDOS") specifically long-term application soil sediment. The mDOS sensor system enables unattended, repeated acquisition time series profiles at subcentimeter resolution covering depth up to one meter. As compared existing approaches, this provides possibility reveal highly variable heterogeneous...
One of the key environmental conditions controlling biogeochemical reactions in aquatic sediments like streambeds is distribution dissolved oxygen. We present a novel approach for situ measurement vertical oxygen profiles using planar luminescence-based optical sensor. The instrument consists transparent acrylic tube with oxygen-sensitive layer mounted on outside. luminescence excited and detected by moveable piston inside tube. Since no moving parts are contact streambed, disturbance...
Various ecosystem functions provided by floodplains depend on a natural river activity and floodplain morphology. Therefore, anthropogenic alterations of rivers modify their flooding regimes may affect the provisioning numerous functions. Restoration projects, which aim at reestablishing processes floodplains, require better understanding ecosystem's ability to simultaneously provide multiple (multifunctionality) how this relates environmental template. Here we investigate relationship...
Abstract. Magnitudes and directions of water flux in the streambed are controlled by hydraulic gradients between groundwater stream bedform-induced hyporheic exchange flows. These fluxes vary over time driven for instance short term flood events or seasonal variations flow level. Variations electrical conductivity (EC) used as a natural tracer to detect transient travel times velocities an in-stream-gravel bar. We present method estimate measuring locations gravel bar non-linearly matching...
Sediment and nutrient retention are essential ecosystem functions that floodplains provide improve river water quality. During floods, the floodplain vegetation retains sediment, which settles on plant surfaces soil underneath plants. Both sedimentation processes require flow velocity is reduced, may be caused by topographic features structure of floodplain. However, relative importance these two drivers their key components have rarely been both quantified. In addition to factors, we expect...
Abstract Sediment and nutrient retention are essential ecosystem functions that floodplains provide improve river water quality. During floods, the floodplain vegetation retains sediment, which settles on plant surfaces soil underneath plants. Both sedimentation processes require flow velocity is reduced, may be caused by topographic features structure of floodplain. However, relative importance these two drivers their key components have rarely been both quantified. In addition to factors,...