A5063105459- Hydrology and Watershed Management Studies
- Cryospheric studies and observations
- Fire effects on ecosystems
- Climate change and permafrost
- Landslides and related hazards
- Flood Risk Assessment and Management
- Climate variability and models
- Soil erosion and sediment transport
- Hydrology and Sediment Transport Processes
- Plant Water Relations and Carbon Dynamics
- Fish Ecology and Management Studies
- Groundwater flow and contamination studies
- Soil and Unsaturated Flow
- Soil Moisture and Remote Sensing
- Hydrological Forecasting Using AI
- Soil and Water Nutrient Dynamics
- Water Quality Monitoring Technologies
- Rangeland and Wildlife Management
- Atmospheric and Environmental Gas Dynamics
- Meteorological Phenomena and Simulations
- Hydrology and Drought Analysis
- Species Distribution and Climate Change
- Aeolian processes and effects
- Urban Heat Island Mitigation
- Mine drainage and remediation techniques
Colorado State University
2016-2025
Waters (United States)
2015-2020
University of Washington
2005-2006
Earth and Space Research
2005
Purdue University West Lafayette
2005
South University
2005
University of Concepción
2003
University of Chile
2003
University of Nevada, Reno
2002
Abstract Non-perennial streams are widespread, critical to ecosystems and society, the subject of ongoing policy debate. Prior large-scale research on stream intermittency has been based long-term averages, generally using annually aggregated data characterize a highly variable process. As result, it is not well understood if, how, or why hydrology non-perennial changing. Here, we investigate trends drivers three signatures that describe duration, timing, dry-down period across continental...
The term distributed model is widely applied to describe hydrologic models that can simulate broad classes of pathways water through space, e.g., overland flow, saturated groundwater and/or unsaturated flow in the vadose zone. Because existing modeling approaches differ substantially from one another, we present a common framework which compare many hillslope‐ and catchment‐scale models. To provide context for understanding structure current generation models, briefly review history...
Abstract Streamflow observations can be used to understand, predict, and contextualize hydrologic, ecological, biogeochemical processes conditions in streams. Stream gages are point measurements along rivers where streamflow is measured, often infer upstream watershed‐scale processes. When stream read zero, this may indicate that the has dried at location; however, zero‐flow readings also caused by a wide range of other factors. Our ability identify whether or not gage reading indicates dry...
Abstract. The Andes span a length of 7000 km and are important for sustaining regional water supplies. Snow variability across this region has not been studied in detail due to sparse unevenly distributed instrumental climate data. We calculated snow persistence (SP) as the fraction time with cover each year between 2000 2016 from Moderate Resolution Imaging Spectroradiometer (MODIS) satellite sensors (500 m, 8-day maximum extent). This analysis is conducted 8 36∘ S high frequency cloud...
Seasonal snow is a critical component of the surface energy balance and hydrologic cycle, yet global maps seasonal boundaries are not readily available. Snow persistence (SP), fraction year that present on ground, an easily globally observed metric can be used to map zones globally. Here we across globe using SP calculated from MODIS10A2 product; evaluate how relates precipitation, temperature, climate indices; examine trends in annual for 2001–2016. In Northern Hemisphere, intermittent,...
Abstract Over half of global rivers and streams lack perennial flow, understanding the distribution drivers their flow regimes is critical for hydrologic, biogeochemical, ecological functions. We analyzed nonperennial using 540 U.S. Geological Survey watersheds across contiguous United States from 1979 to 2018. Multivariate analyses revealed regional differences in no‐flow fraction, date first no duration dry‐down period, with further divergence between natural human‐altered watersheds....
Rivers that cease to flow are globally prevalent. Although many epithets have been used for these rivers, a consensus on terminology has not yet reached. Doing so would facilitate marked increase in interdisciplinary interest as well critical need clear regulations. Here we reviewed literature from Web of Science database searches 12 learn (Objective 1—O1) if epithet topics consistent across categories using latent Dirichlet allocation topic modeling. We also analyzed publication rates and...
Abstract Continued climate warming is reducing seasonal snowpacks in the western United States, where >50% of historical water supplies were snowmelt‐derived. In Upper Colorado River Basin, declining snow equivalent (SWE) and altered surface input (SWI, rainfall snowmelt available to enter soil) timing magnitude affect streamflow generation availability. To adapt effectively future conditions, we need understand current spatiotemporal distributions SWE SWI how they may change decades. We...
Abstract The Colorado Front Range has a large elevation gradient with deep seasonal snowpack in the mountains and limited snow accumulation foothills plains. This study examines how sources of annual peak flows (snowmelt, rainfall, mixed) change fraction time persists on ground, persistence (SP), whether these have changed over time. Sources for 20 gaging stations are estimated using gridded rain model forced PRISM daily precipitation both TopoWx temperature. mean snowmelt contribution to...
Abstract Pyrogenic carbon (PyC) constitutes a significant fraction of organic in most soils. However, PyC soil stocks are generally smaller than what is expected from estimates produced fire and decomposition losses, implying that other processes cause loss Surface erosion has been previously suggested as one such process. To address this, following large wildfire the Rocky Mountains (CO, USA), we tracked litter layer soil, through eroded, suspended, dissolved solids to alluvial deposits...
Abstract Streamflow generation in mountain watersheds is strongly influenced by snow accumulation and melt, multiple studies have found that loss leads to earlier snowmelt timing declines annual streamflow. However, hydrologic responses are heterogeneous, not all areas experience streamflow declines. This research examines whether different for rainfall versus inputs. We compiled a sample of 57 small U.S. Geological Survey the western United States containing Natural Resource Conservation...
Abstract The discipline of hydrology has long focused on quantifying the water balance, which is frequently used to estimate unknown fluxes or stores. While technologies for measuring balance components continue improve, all have substantial uncertainty at watershed scale. Watershed‐scale evapotranspiration, storage, and groundwater import export are particularly difficult measure. Given these uncertainties, analyses based assumed closure highly sensitive propagation errors omission, where...
Nonperennial streams dominate global river networks and are increasing in occurrence across space time. When surface flow ceases or the water dries, moisture can be retained subsurface sediments of hyporheic zone, supporting aquatic communities ecosystem processes. However, hydrological ecological definitions zone have been developed perennial rivers emphasize mixing organisms from both stream groundwater. The adaptation such to include humid dry unsaturated conditions could promote...
Wildfire area has been increasing in most ecoregions across the western United States, including snow-dominated regions. These fires modify snow accumulation, ablation, and duration, but sign magnitude of these impacts can vary substantially between This study compares spatiotemporal patterns States wildfires zones. Results demonstrate significant increases wildfire from 1984 to 2020 throughout West, Sierra Nevada, Cascades, Basin Range, Northern Southern Rockies. In late zone, where mean...
Many applications require estimation of reference evapotranspiration (ETo) in areas where meteorological measurements are limited. Previous studies have shown that simple models based on radiation and temperature perform relatively well humid climates but underpredict ETo drier windier climates. In this paper, estimates existing were compared with calculated the more comprehensive Penman-Monteith equation using at 106 locations contiguous United States for a range Results showed simpler...
Mountain snowpacks are important water supplies that susceptible to climate change, yet snow measurements sparse relative snowpack heterogeneity. We used remote sensing derive a spatiotemporal index of climatology reveals patterns in accumulation, persistence, and ablation. Then we examined how this relates climate, terrain, vegetation. Analyses were based on Moderate Resolution Imaging Spectroradiometer eight-day cover from 2000 2010 for mountain watershed the Colorado Front Range, USA. The...
Abstract With climate warming, many regions are experiencing changes in snow accumulation and persistence. These known to affect streamflow volume, but the magnitude of effect varies between regions. This research evaluates whether variables derived from remotely sensed cover can be used estimate annual at small watershed scale across western U.S., a region with wide range types. We compared MODIS, persistence (SP), season (SS), more commonly utilized metrics, fraction (fraction...
Citizen scientists keep a watchful eye on the world's streams, catching intermittent streams in action and filling data gaps to construct more complete hydrologic picture.
Abstract. Streamflow generation and deep groundwater recharge may be vulnerable to loss of snow, making it important quantify how snowmelt is partitioned between soil storage, drainage, evapotranspiration, runoff. Based on previous findings, we hypothesize that produces greater streamflow drainage than rainfall this effect greatest in dry climates. To test hypothesis examine partitioning vary with climate properties using a physically based variably saturated subsurface flow model,...