A5045495549- Hydrology and Watershed Management Studies
- Soil and Water Nutrient Dynamics
- Groundwater flow and contamination studies
- Fish Ecology and Management Studies
- Groundwater and Isotope Geochemistry
- Hydrology and Sediment Transport Processes
- Flood Risk Assessment and Management
- Hydrological Forecasting Using AI
- Peatlands and Wetlands Ecology
- Wastewater Treatment and Nitrogen Removal
- Marine and coastal ecosystems
- Water Quality and Pollution Assessment
- Cryospheric studies and observations
- Air Quality Monitoring and Forecasting
- Freshwater macroinvertebrate diversity and ecology
- Soil erosion and sediment transport
- Smart Materials for Construction
- Water-Energy-Food Nexus Studies
- Flow Measurement and Analysis
- Fluid Dynamics and Mixing
- Water Quality Monitoring and Analysis
- Covalent Organic Framework Applications
- Underwater Acoustics Research
- Odor and Emission Control Technologies
- Aquatic and Environmental Studies
ETH Zurich
2018-2024
Durham University
2020-2024
University of Tübingen
2015-2019
Northwestern University
2019
United States Geological Survey
2017
Abstract. Studying the response of streamwater chemistry to changes in discharge can provide valuable insights into how catchments store and release water solutes. Previous studies have determined concentration–discharge (cQ) relationships from long-term, low-frequency data a wide range These analyses, however, little insight coupling solute concentrations flow during individual hydrologic events. Event-scale cQ rarely been investigated across solutes over extended periods time, thus is...
Abstract Headwater catchments are the fundamental units that connect land to ocean. Hydrological flow and biogeochemical processes intricately coupled, yet their respective sciences have progressed without much integration. Reaction kinetic theories prescribe rate dependence on environmental variables (e.g., temperature water content) advanced substantially, mostly in well‐mixed reactors, columns, warming experiments considering characteristics of hydrological at catchment scale. These shown...
Abstract Shallow benthic biolayers at the top of streambed are believed to be places enhanced biogeochemical turnover within hyporheic zone. They can investigated by reactive stream tracer tests with recordings in and channel. Common in‐stream measurements such tracers cannot localize where processing primarily takes place, whereas isolated vertical depth profiles solutes zone usually not representative entire stream. We present results a test we injected conservative bromide together...
Abstract Hyporheic zones increase freshwater ecosystem resilience to hydrological extremes and global environmental change. However, current conceptualizations of hyporheic exchange, residence time distributions, the associated biogeochemical cycling in streambed sediments do not always accurately explain complexity observed streams rivers. Specifically, existing conceptual models insufficiently represent coupled transport reactivity along groundwater surface water flow paths, role...
Abstract. Long-term, high-frequency time series of passive tracers in precipitation and streamflow are essential for quantifying catchment transport storage processes, but few such data sets publicly available. Here we describe, present, make available to the public two extensive stable water isotopes at Plynlimon experimental catchments central Wales. Stable isotope 7-hourly intervals 17 months, weekly 4.25 years. Precipitation values were highly variable both sets, high temporal resolution...
Abstract Changes in streamwater chemistry have frequently been used to understand the storage and release of water solutes at catchment scale. Streamwater typically varies space time, depending on sources, mobilization mechanisms, pathways solutes. However, less is known about role lateral hydrologic connectivity how it may influence solute export patterns under different wetness conditions. This study analyses long‐term low‐frequency data from four UK catchments using antecedent as proxy...
Abstract The resazurin‐resorufin tracer system has been used to quantify surface water‐sediment interactions and microbial metabolic activity in stream ecosystems for one decade. This review describes the evolution of technique summarizes how it by hydrologic ecology communities. We highlight major applications milestones advancement reactive on scales ranging from cells river reaches catchments. discuss advantages limitations suggest new directions research, including address existing...
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...
Interpreting the fate of wastewater contaminants in streams is difficult because their inputs vary time and several processes synchronously affect reactive transport. We present a method to disentangle various influences by performing conservative-tracer test while sampling stream section at locations for chemical analysis micropollutants. By comparing outflow concentrations with tracer signal convoluted inflow series, we estimated reaction rate coefficients calculated contaminant removal...
Abstract Novel observation techniques (e.g., smart tracers) for characterizing coupled hydrological and biogeochemical processes are improving understanding of stream network transport transformation dynamics. In turn, these observations thought to enable increasingly sophisticated representations within transient storage models (TSMs). However, TSM parameter estimation is prone issues with insensitivity equifinality, which grow as parameters added model formulations. Currently, it unclear...
Abstract Due to its simplicity, adaptability, and accessibility, the transient storage model has become one of most widely used tools investigate transport exchange processes in streams. In spite ubiquitous use, a number challenges remain, particular with respect conceptualization interpretation. Are parameters good approximations physical properties? What is relevance parameter interactions increasingly complex conceptualizations model? How does novel data inform, improve, or falsify our...
Abstract The complexity of hyporheic flow paths requires reach‐scale models solute transport in streams that are flexible their representation the passage. We use a model couples advective‐dispersive in‐stream to exchange with shape‐free distribution travel times. also accounts for two‐site sorption and transformation reactive solutes. coefficients determined by fitting concurrent stream‐tracer tests conservative (fluorescein) (resazurin/resorufin) compounds. flexibility give rise multiple...
Abstract Stream metabolism is a fundamental, integrative indicator of aquatic ecosystem functioning. However, it not well understood how heterogeneity in physical channel form, particularly relation to and caused by in‐stream woody debris, regulates stream lowland streams. We combined conservative reactive tracers investigate relationships between patterns morphology hydrological transport ( form ) metabolic processes as characterized respiration function forested at baseflow. reach‐scale...
Abstract. Although most field and modeling studies of river corridor exchange have been conducted at scales ranging from tens to hundreds meters, results these are used predict their ecological hydrological influences the scale networks. Further complicating prediction, exchanges expected vary with hydrologic forcing local geomorphic setting. While we desire predictive power, lack a complete spatiotemporal relationship relating discharge variation in geologic setting that is across basin....
The role of alternative terminal electron acceptors in peatland restoration.Emily Fearns-Nicol, Catherine Hirst, Julia Knapp, Fred WorrallDepartment Earth Sciences, Durham University, Science Laboratories, South Road, Durham, DH1 3LE, UK.  The existence peatlands relies on the balance primary productivity and oxidation organic matter. Oxidation requires a acceptor (TEA). most energetically favourable TEA is O2 followed, order reducing energy return, by NO3, Mn, Fe, SO4....
Leaky dams, particularly those constructed from large woody material, are increasingly implemented in headwater streams to reduce runoff rates by enhancing channel roughness, slowing flow velocities, and creating temporary water storage during high-flow events desynchronise flood peaks within catchments. Despite significant progress modelling the hydraulic hydrological effects of leaky dams through flume experiments field studies, design guidance for construction still needs be improved. A...
Rivers provide essential ecosystem services, supporting biodiversity, regulating water flow, and supplying resources important for human societies. However, anthropogenic pressures climate change are increasingly impacting riverine ecosystems, leading to widespread decline in quality. While substantial progress has been made understanding long-term quality trends, our of variations within different catchments is still limited. Moreover, there a lack insight into how these relate each other...
Abstract. Ensemble hydrograph separation has recently been proposed as a technique for using passive tracers to estimate catchment transit time distributions and new water fractions, introducing powerful tool quantifying behavior. However, the technical details of necessary calculations may not be straightforward many users implement. We have therefore developed scripts that perform these on two widely used platforms (MATLAB R), make methods more accessible community. These implement robust...
Abstract. Automated field sampling of streamwater or precipitation for subsequent analysis stable water isotopes (2H and 18O) is often conducted with off-the-shelf automated samplers. However, when samples are stored in the days weeks open bottles inside autosamplers, their isotopic signatures can be altered by evaporative fractionation vapor mixing. We therefore designed an evaporation protection method which modifies autosampler using a syringe housing silicone tube, we tested whether this...
Nitrogen cycling has been dramatically altered by anthropogenic activities, impacting water quality and ecosystem functioning of river systems worldwide. Understanding the (a)synchrony between discharge (Q) nitrate concentration (N) is crucial to revealing temporal-spatial processes that govern nitrogen dynamics identify controlling factors improve monitoring management strategies. Here data collected from 66 catchments across England, spanning 20 years, were analysed characterise Q-N...
Abstract. A comprehensive set of measurements and calculated metrics describing physical, chemical, biological conditions in the river corridor is presented. These data were collected a catchment-wide, synoptic campaign H. J. Andrews Experimental Forest (Cascade Mountains, Oregon, USA) summer 2016 during low-discharge conditions. Extensive characterization 62 sites including surface water, hyporheic streambed sediment was conducted spanning 1st- through 5th-order reaches network. The...
Abstract Fluvial networks integrate, transform, and transport constituents from terrestrial aquatic ecosystems. To date, most research on water quality dynamics has focused process understanding at individual streams, and, as a result, there is lack of studies analyzing how physical biogeochemical drivers scale across fluvial networks. We performed tracer tests in five stream orders the Jemez River continuum New Mexico, USA, to quantify reach‐scale hyporheic exchange during two different...