A5043414848- Hydrology and Watershed Management Studies
- Hydrology and Sediment Transport Processes
- Soil erosion and sediment transport
- Fish Ecology and Management Studies
- Soil and Water Nutrient Dynamics
- Flood Risk Assessment and Management
- Cryospheric studies and observations
- Groundwater and Isotope Geochemistry
- Freshwater macroinvertebrate diversity and ecology
- Hydrological Forecasting Using AI
- Landslides and related hazards
- Plant Water Relations and Carbon Dynamics
- Hydraulic flow and structures
- Groundwater flow and contamination studies
- Fire effects on ecosystems
- Water Quality and Resources Studies
- Peatlands and Wetlands Ecology
- Forest Management and Policy
- Isotope Analysis in Ecology
- Geological and Geophysical Studies Worldwide
- Soil Moisture and Remote Sensing
- Geological and Tectonic Studies in Latin America
- Remote Sensing and LiDAR Applications
- Immune Cell Function and Interaction
- Ecology and biodiversity studies
Oregon State University
2016-2025
The University of Texas Health Science Center at San Antonio
2024
North Carolina State University
2010-2014
University of Washington
2010
University of Colorado Boulder
2007-2010
Abstract Stream water temperature ( t s ) is a critical quality parameter for aquatic ecosystems. However, records are sparse or nonexistent in many river systems. In this work, we present an empirical model to predict at the site scale across USA. The model, derived using data from 171 reference sites selected Geospatial Attributes of Gages Evaluating Streamflow database, describes linear relationship between monthly mean air and . Multiple regression models used slope m intercept b –t...
Rainfall runoff erosivity (<i>R</i>) is one key climate factor that controls water erosion. Quantifying the effects of change–induced change important for identifying critical regions prone to soil erosion under a changing environment. In this study we first evaluate changes <i>R</i> from 1970 2090 across United States nine conditions predicted by three general circulation models emissions scenarios (A2, A1B, and B1) Fourth Assessment Report Intergovernmental Panel on Climate Change. Then,...
Abstract Baseflow is essential for stream ecosystems and human water uses, particularly in areas with Mediterranean climates. Yet the factors controlling temporal spatial variability of baseflow its sources are poorly understood. Measurements oxygen hydrogen isotopic composition (δ 18 O δ 2 H) were used to evaluate controls on network a 64‐km catchment western Oregon. A total 607 samples collected contrast year near average precipitation (2016) low winter snowpack subsequent summer drought...
Abstract This study investigates trends in bed surface and substrate grain sizes relation to reach‐scale hydraulics using data from more than 100 gravel‐bed stream reaches Colorado Utah. Collocated measurements of sediment, bankfull channel geometry slope are used examine relations between reach‐average shear stress sediment size. Slopes at the sites range 0·0003 0·07; depths 0·2 5 m widths 2 200 m. The show that there is much less variation median size substrate, D 50s , surface, 50 ; ratio...
Abstract. This study focuses on the investigation of mean transit time (MTT) water and its spatial variability in a tropical high-elevation ecosystem (wet Andean páramo). The site is Zhurucay River Ecohydrological Observatory (7.53 km2) located southern Ecuador. A lumped parameter model considering five distribution (TTD) functions was used to estimate MTTs under steady-state conditions (i.e., baseflow MTT). We unique data set δ18O isotopic composition rainfall streamflow samples collected...
Eco-hydro-meteorological variables (EHM) are key indicators for assessing the impacts of climate change on ecosystems, affecting hydrological processes and resilience forest systems. Meteorological forcing, such as precipitation vapor pressure deficit, notably determines soil moisture variability, strongly related to tree transpiration sap flow rate. In turn, is affected by uptake. Understanding feedback among these crucial effectively managing water resources more robust predictions effect...
Preferential flow (PF) is a key hydrological process that influences water infiltration, soil moisture redistribution, and streamflow generation. In Mediterranean forested catchments, the dynamics of PF its controls remain largely underexplored. Here, we investigated mechanisms their impact on response in Re della Pietra experimental catchment (2 km&#178;) Tuscan Apennines, central Italy. Two hillslope transects with sensors at shallow (15 cm) deep (35 layers were monitored for 34 18...
Mediterranean mountainous basins play a vital role in supplying water and supporting ecosystem services. However, these environments are increasingly threatened by climate change. Recent studies reveal that catchments the region, which experienced substantial snow accumulation from 1970 to 1990, now facing reduced levels faster snowmelt since 2000. These changes can significantly affect seasonality volume of runoff groundwater recharge as well vegetation phenology. Given expected drier...
Recent studies of catchment hydrologic response are incorporating increasingly complex datasets to investigate model representation spatial and temporal variability. In this paper, rainfall‐runoff stable isotope tracer were modeled using a lumped conceptual that integrates the unit hydrograph separation methodologies. The was applied across eight nested catchments (7 147 ha) for four rainstorms collected between summer fall in 2001–2002, generating usable 23 rainstorm ranging from 1.2 10.3 h...
Abstract Assessment of potential climate change impacts on stream water temperature ( T s ) across large scales remains challenging for resource managers because energy exchange processes between the atmosphere and environment are complex uncertain, few long‐term datasets available to evaluate changes over time. In this study, we demonstrate how simple monthly linear regression models based short‐term historical observations readily interpolated air a estimates can be used rapid assessment...
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....
Abstract Understanding the temporal and spatial variability of water sources within a basin is vital to our ability interpret hydrologic controls on biogeochemical processes manage resources. Water stable isotopes can be used as tool determine geographic seasonal at scale. Previous studies in Coastal Range Oregon reported that variation isotopic signatures surface did not conform commonly observed “elevation effect,” which exhibits trend increasing depletion with rising elevation. The...
The scaling properties of channel‐forming flows are investigated using a regional flow frequency model developed for snowmelt‐dominated streams in Colorado. is derived from analyses daily records at 32 gauging stations where we have independent measurements the bankfull discharge. study sites located alpine/subalpine basins with drainage areas ranging 4 to 3700 km 2 . distribution these locations can be reproduced broken power law (BPL) function described by two free parameters. Both...
Abstract This study investigated spatial‐temporal variations of shear stress and bed load transport at three gravel river reaches the Williams Fork River, Colorado. A two‐dimensional flow model was used to compute spatial distributions ( τ ) for four discharge levels between one third bankfull Q bf . Results indicate that mean values are highly variable among sites. However, properties mean‐normalized similar across sites all flows. The then with a function rates individual grain size...
Abstract Stream temperature is a key physical water‐quality parameter, controlling many biological, chemical, and processes in aquatic ecosystems. Maintenance of cool stream temperatures during summer critical for high‐quality habitat. As such, transmission warm water from small, nonfish‐bearing headwater streams after forest harvesting could cause warming downstream fish‐bearing reaches with negative consequences. In this study, we evaluate (a) the effects contemporary management practices...