All Outputs (29)

Concentration‐Discharge Relationships Revisited: Overused But Underutilised? (2024)
Journal Article
Knapp, J. L. A., & Musolff, A. (2024). Concentration‐Discharge Relationships Revisited: Overused But Underutilised?. Hydrological Processes, 38(11), Article e15328. https://doi.org/10.1002/hyp.15328

Over the past 50 years, concentration‐discharge (cQ) relationships have been widely used to analyse water quality dynamics. Nowadays improved availability of concentration (c) and discharge (Q) data at different spatial and temporal scales have led t... Read More about Concentration‐Discharge Relationships Revisited: Overused But Underutilised?.

Multi-year time series of daily solute and isotope measurements from three Swiss pre-Alpine catchments (2024)
Journal Article
Knapp, J. L. A., Napitupulu, T., von Freyberg, J., Rücker, A., Studer, B., Zappa, M., & Kirchner, J. W. (2024). Multi-year time series of daily solute and isotope measurements from three Swiss pre-Alpine catchments. Scientific Data, 11(1), 393. https://doi.org/10.1038/s41597-024-03192-5

Time series analyses of solute concentrations in streamwater and precipitation are powerful tools for unraveling the interplay of hydrological and biogeochemical processes at the catchment scale. While such datasets are available for many sites aroun... Read More about Multi-year time series of daily solute and isotope measurements from three Swiss pre-Alpine catchments.

River water quality shaped by land–river connectivity in a changing climate (2024)
Journal Article
Li, L., Knapp, J. L. A., Lintern, A., Ng, G. C., Perdrial, J., Sullivan, P. L., & Zhi, W. (2024). River water quality shaped by land–river connectivity in a changing climate. Nature Climate Change, 14(3), 225-237. https://doi.org/10.1038/s41558-023-01923-x

River water quality is crucial to ecosystem health and water security, yet its deterioration under climate change is often overlooked in climate risk assessments. Here we review how climate change influences river water quality via persistent, gradua... Read More about River water quality shaped by land–river connectivity in a changing climate.

The heat is on: Predicting urban stream temperature responses to summer storms (2023)
Journal Article
Knapp, J. L. A., & Kelleher, C. (2023). The heat is on: Predicting urban stream temperature responses to summer storms. Hydrological Processes, 37(11), Article e15033. https://doi.org/10.1002/hyp.15033

Short‐term increases in stream temperature in response to storm events have frequently been observed in urban areas, highlighting the need for improved understanding of the factors influencing urban stream temperature. Urban land cover complexity and... Read More about The heat is on: Predicting urban stream temperature responses to summer storms.

Using diel solute signals to assess ecohydrological processing in lotic systems (2023)
Book Chapter
Knapp, J. (2023). Using diel solute signals to assess ecohydrological processing in lotic systems. In S. Krause, D. M. Hannah, & N. B. Grimm (Eds.), Ecohydrological Interfaces. Wiley

Hydrologic connectivity and source heterogeneity control concentration–discharge relationships (2022)
Journal Article
Knapp, J. L., Li, L., & Musolff, A. (2022). Hydrologic connectivity and source heterogeneity control concentration–discharge relationships. Hydrological Processes, 36(9), Article e14683. https://doi.org/10.1002/hyp.14683

Changes in streamwater chemistry have frequently been used to understand the storage and release of water and solutes at the catchment scale. Streamwater chemistry typically varies in space and time, depending on sources, mobilization mechanisms, and... Read More about Hydrologic connectivity and source heterogeneity control concentration–discharge relationships.

Organizational Principles of Hyporheic Exchange Flow and Biogeochemical Cycling in River Networks Across Scales (2022)
Journal Article
Krause, S., Abbott, B. W., Baranov, V., Bernal, S., Blaen, P., Datry, T., Drummond, J., Fleckenstein, J. H., Velez, J. G., Hannah, D. M., Knapp, J. L., Kurz, M., Lewandowski, J., Martí, E., Mendoza‐Lera, C., Milner, A., Packman, A., Pinay, G., Ward, A. S., & Zarnetzke, J. P. (2022). Organizational Principles of Hyporheic Exchange Flow and Biogeochemical Cycling in River Networks Across Scales. Water Resources Research, 58(3), Article e2021WR029771. https://doi.org/10.1029/2021wr029771

Hyporheic zones increase freshwater ecosystem resilience to hydrological extremes and global environmental change. However, current conceptualizations of hyporheic exchange, residence time distributions, and the associated biogeochemical cycling in s... Read More about Organizational Principles of Hyporheic Exchange Flow and Biogeochemical Cycling in River Networks Across Scales.

Rapid Advances in Mobile Mass Spectrometry Enhance Tracer Hydrology and Water Management (2021)
Journal Article
Popp, A. L., Manning, C. C., & Knapp, J. L. (2021). Rapid Advances in Mobile Mass Spectrometry Enhance Tracer Hydrology and Water Management. Water Resources Research, 57(6), Article e2021WR029890. https://doi.org/10.1029/2021wr029890

Dissolved gases, including noble gases, are versatile environmental tracers. Historically, the application of dissolved (noble) gases as tracers in hydrology used to be limited because their measurement required expensive, laboratory-based instrument... Read More about Rapid Advances in Mobile Mass Spectrometry Enhance Tracer Hydrology and Water Management.

Technical note: Evaluation of a low-cost evaporation protection method for portable water samplers (2020)
Journal Article
von Freyberg, J., Knapp, J. L., Rücker, A., Studer, B., & Kirchner, J. W. (2020). Technical note: Evaluation of a low-cost evaporation protection method for portable water samplers. Hydrology and Earth System Sciences, 24(12), 5821-5834. https://doi.org/10.5194/hess-24-5821-2020

Automated field sampling of streamwater or precipitation for subsequent analysis of stable water isotopes (2H and 18O) is often conducted with off-the-shelf automated samplers. However, when water samples are stored in the field for days and weeks in... Read More about Technical note: Evaluation of a low-cost evaporation protection method for portable water samplers.

Toward catchment hydro‐biogeochemical theories (2020)
Journal Article
Li, L., Sullivan, P. L., Benettin, P., Cirpka, O. A., Bishop, K., Brantley, S. L., Knapp, J. L., Meerveld, I., Rinaldo, A., Seibert, J., Wen, H., & Kirchner, J. W. (2021). Toward catchment hydro‐biogeochemical theories. Wiley Interdisciplinary Reviews: Water, 8(1), Article e1495. https://doi.org/10.1002/wat2.1495

Technical note: Calculation scripts for ensemble hydrograph separation (2020)
Journal Article
Kirchner, J. W., & Knapp, J. L. (2020). Technical note: Calculation scripts for ensemble hydrograph separation. Hydrology and Earth System Sciences, 24(11), https://doi.org/10.5194/hess-24-5539-2020

Concentration–discharge relationships vary among hydrological events, reflecting differences in event characteristics (2020)
Journal Article
Knapp, J. L., von Freyberg, J., Studer, B., Kiewiet, L., & Kirchner, J. W. (2020). Concentration–discharge relationships vary among hydrological events, reflecting differences in event characteristics. Hydrology and Earth System Sciences, 24(5), 2561-2576. https://doi.org/10.5194/hess-24-2561-2020

Spatiotemporal Variability in Transport and Reactive Processes Across a First‐ to Fifth‐Order Fluvial Network (2020)
Journal Article
Gootman, K. S., González‐Pinzón, R., Knapp, J. L., Garayburu‐Caruso, V., & Cable, J. E. (2020). Spatiotemporal Variability in Transport and Reactive Processes Across a First‐ to Fifth‐Order Fluvial Network. Water Resources Research, 56(5), https://doi.org/10.1029/2019wr026303

The method controls the story - Sampling method impacts on the detection of pore-water nitrogen concentrations in streambeds (2020)
Journal Article
Comer-Warner, S., Knapp, J. L., Blaen, P., Klaar, M., Shelley, F., Zarnetske, J., Lee-Cullin, J., Folegot, S., Kurz, M., Lewandowski, J., Harvey, J., Ward, A., Mendoza-Lera, C., Ullah, S., Datry, T., Kettridge, N., Gooddy, D., Drummond, J., Martí, E., Milner, A., …Krause, S. (2020). The method controls the story - Sampling method impacts on the detection of pore-water nitrogen concentrations in streambeds. Science of the Total Environment, 709, https://doi.org/10.1016/j.scitotenv.2019.136075

A Perspective on the Future of Transient Storage Modeling: Let's Stop Chasing Our Tails (2020)
Journal Article
Knapp, J. L., & Kelleher, C. (2020). A Perspective on the Future of Transient Storage Modeling: Let's Stop Chasing Our Tails. Water Resources Research, 56(3), https://doi.org/10.1029/2019wr026257

Spatial and temporal variation in river corridor exchange across a 5th-order mountain stream network (2019)
Journal Article
Ward, A. S., Wondzell, S. M., Schmadel, N. M., Herzog, S., Zarnetske, J. P., Baranov, V., Blaen, P. J., Brekenfeld, N., Chu, R., Derelle, R., Drummond, J., Fleckenstein, J. H., Garayburu-Caruso, V., Graham, E., Hannah, D., Harman, C. J., Hixson, J., Knapp, J. L., Krause, S., Kurz, M. J., …Wisnoski, N. I. (2019). Spatial and temporal variation in river corridor exchange across a 5th-order mountain stream network. Hydrology and Earth System Sciences, 23(12), https://doi.org/10.5194/hess-23-5199-2019

New water fractions and transit time distributions at Plynlimon, Wales, estimated from stable water isotopes in precipitation and streamflow (2019)
Journal Article
Knapp, J. L., Neal, C., Schlumpf, A., Neal, M., & Kirchner, J. W. (2019). New water fractions and transit time distributions at Plynlimon, Wales, estimated from stable water isotopes in precipitation and streamflow. Hydrology and Earth System Sciences, 23(10), https://doi.org/10.5194/hess-23-4367-2019

Solute Transport and Transformation in an Intermittent, Headwater Mountain Stream with Diurnal Discharge Fluctuations (2019)
Journal Article
Ward, A. S., Kurz, M. J., Schmadel, N. M., Knapp, J. L., Blaen, P. J., Harman, C. J., Drummond, J. D., Hannah, D. M., Krause, S., Li, A., Marti, E., Milner, A., Miller, M., Neil, K., Plont, S., Packman, A. I., Wisnoski, N. I., Wondzell, S. M., & Zarnetske, J. P. (2019). Solute Transport and Transformation in an Intermittent, Headwater Mountain Stream with Diurnal Discharge Fluctuations. Water, 11(11), Article 2208. https://doi.org/10.3390/w11112208

Co-located contemporaneous mapping of morphological, hydrological, chemical, and biological conditions in a 5th-order mountain stream network, Oregon, USA (2019)
Journal Article
Ward, A. S., Zarnetske, J. P., Baranov, V., Blaen, P. J., Brekenfeld, N., Chu, R., Derelle, R., Drummond, J., Fleckenstein, J. H., Garayburu-Caruso, V., Graham, E., Hannah, D., Harman, C. J., Herzog, S., Hixson, J., Knapp, J. L., Krause, S., Kurz, M. J., Lewandowski, J., Li, A., …Wondzell, S. M. (2019). Co-located contemporaneous mapping of morphological, hydrological, chemical, and biological conditions in a 5th-order mountain stream network, Oregon, USA. Earth System Science Data, 11(4), https://doi.org/10.5194/essd-11-1567-2019

Exploring Tracer Information and Model Framework Trade‐Offs to Improve Estimation of Stream Transient Storage Processes (2019)
Journal Article
Kelleher, C., Ward, A., Knapp, J., Blaen, P., Kurz, M., Drummond, J., Zarnetske, J., Hannah, D., Mendoza‐Lera, C., Schmadel, N., Datry, T., Lewandowski, J., Milner, A., & Krause, S. (2019). Exploring Tracer Information and Model Framework Trade‐Offs to Improve Estimation of Stream Transient Storage Processes. Water Resources Research, 55(4), https://doi.org/10.1029/2018wr023585