A5070818166- Hydrology and Watershed Management Studies
- Flood Risk Assessment and Management
- Cryospheric studies and observations
- Hydrology and Sediment Transport Processes
- Climate change and permafrost
- Atmospheric and Environmental Gas Dynamics
- Methane Hydrates and Related Phenomena
- Arctic and Antarctic ice dynamics
- Winter Sports Injuries and Performance
- Remote Sensing and LiDAR Applications
- Fish Ecology and Management Studies
- Landslides and related hazards
- Hydrological Forecasting Using AI
- Underwater Vehicles and Communication Systems
- Geology and Paleoclimatology Research
- Underwater Acoustics Research
- Marine and coastal ecosystems
- Precipitation Measurement and Analysis
- Offshore Engineering and Technologies
- Coastal and Marine Dynamics
- Peatlands and Wetlands Ecology
- Transboundary Water Resource Management
- Forest ecology and management
- Geochemistry and Geologic Mapping
- Maritime Navigation and Safety
University of Massachusetts Amherst
2016-2025
Union College
2022
University of Washington
2021
United States Geological Survey
2021
Pacific Island Ecosystems Research Center
2021
University of California, Los Angeles
2012-2016
Purchase College
2011
Spatiotemporally continuous global river discharge estimates across the full spectrum of stream orders are vital to a range hydrologic applications, yet they remain poorly constrained. Here we present carefully designed modeling effort (Variable Infiltration Capacity land surface model and Routing Application for Parallel computatIon Discharge routing model) estimate at very high resolutions. The precipitation forcing is from recently published 0.1° product that optimally merged gauge-,...
Rivers provide critical water supply for many human societies and ecosystems, yet global knowledge of their flow rates is poor. We show that useful estimates absolute river discharge (in cubic meters per second) may be derived solely from satellite images, with no ground-based or a priori information whatsoever. The approach works owing to discovery characteristic scaling law uniquely fundamental natural rivers, here termed river's at-many-stations hydraulic geometry. A first demonstration...
Significance Meltwater runoff from the Greenland ice sheet is a key contributor to global sea level rise and expected increase in future, but it has received little observational study. We used satellite situ technologies assess surface drainage conditions on southwestern ablation after an extreme 2012 melting event. conclude that efficiently drained under optimal conditions, digital elevation models alone cannot fully describe supraglacial its connection subglacial systems, predicting...
Abstract The Surface Water and Ocean Topography (SWOT) satellite mission planned for launch in 2020 will map river elevations inundated area globally rivers >100 m wide. In advance of this launch, we here evaluated the possibility estimating discharge ungauged using synthetic, daily “remote sensing” measurements derived from hydraulic models corrupted with minimal observational errors. Five algorithms were evaluated, as well median five, 19 spanning a range geomorphic conditions. Reliance...
SignificanceStream/river carbon dioxide (CO2) emission has significant spatial and seasonal variations critical for understanding its macroecosystem controls plumbing of the terrestrial budget. We relied on direct fluvial CO2 partial pressure measurements seasonally varying gas transfer velocity river network surface area estimates to resolve reach-level flux at global scale. The percentage primary production (GPP) shunted into rivers that ultimately contributes evasion increases with...
Arctic rivers drain ~15% of the global land surface and significantly influence local communities economies, freshwater marine ecosystems, climate. However, trusted public knowledge pan-Arctic is inadequate, especially for small across Eurasia, inhibiting understanding response to climate change. Here, we calculate daily streamflow in 486,493 river reaches from 1984-2018 by assimilating 9.18 million discharge estimates made 155,710 satellite images into hydrologic model simulations. We...
Abstract The Surface Water and Ocean Topography (SWOT) mission will vastly expand measurements of global rivers, providing critical new data sets for both gaged ungaged basins. SWOT discharge products (available approximately 1 year after launch) provide all river that reaches wider than 100 m. In this paper, we describe how produced archived by the US French space agencies be computed from water surface elevation, width, slope ancillary data, along with expected accuracy. We present first...
Changes in the Yangtze River level induced by large-scale human water regulation have profound implications on inundation dynamics of surrounding lakes/wetlands and integrity related ecosystems. Using situ measurements hydrological simulation, this study reveals an altered regime downstream from Three Gorges Dam (TGD) to estuary East China Sea as a combined result (i) TGD's flow (ii) channel erosion due reduced sediment load. During average annual cycle regular control 2009–2012, variations...
Abstract Knowledge of river discharge is critically important for water resource management, climate modeling, and improved understanding the global cycle, yet poorly known in much world. Remote sensing holds promise to mitigate this gap, current approaches quantitative retrievals require situ calibration or a priori knowledge hydraulics, limiting their utility unmonitored regions. Recently, Gleason Smith (2014) demonstrated within 20–30% observations solely from Landsat TM satellite images...
Significance Meltwater runoff is an important hydrological process operating on the Greenland ice sheet surface that rarely studied directly. By combining satellite and drone remote sensing with continuous field measurements of discharge in a large supraglacial river, we obtained 72 h observations suitable for comparison climate model predictions. The quantify how large, fluvial catchment attenuates magnitude timing delivered to its terminal moulin hence bed. data are used calibrate...
The geomorphic relationships known as hydraulic geometry (HG) were first introduced by Leopold and Maddock in 1953, their application remains critically important for assessing water resources the world over. practical utility of HG discharge monitoring, habitat studies, understanding change over time is unquestioned, but its elevation beyond empirically observed relationship to physical principle not complete, despite universal acceptance existence. This review summarizes six decades...
The morphology and abundance of streams control the rates hydraulic biogeochemical exchange between streams, groundwater, atmosphere. In large river systems, relationship width is fractal, such that narrow rivers are proportionally more common than wider rivers. However, in headwater where many reactions most rapid, stream unknown. To constrain this uncertainty, we surveyed hydromorphology (wetted length) several networks across North America New Zealand. Here, find a strikingly consistent...
Abstract Cities have historically developed close to rivers and coasts, increasing human exposure flooding. That is exacerbated by changes in climate population, urban encroachment on floodplains. Although the mechanisms of how urbanization affects flooding are relatively well understood, there been limited efforts assess magnitude floodplain globally it has changed both space time. Highly resolved global datasets flood hazard area from 1985 2015 now available, enabling reconstruction...
Abstract Long-term, continuous, and real-time streamflow records are essential for understanding managing freshwater resources. However, we find that 37% of publicly available global gauge ( N = 45 837) discontinuous 77% do not contain data. Historical periods social upheaval associated with declines in data availability. Using river width observations from Landsat Sentinel-2 satellites, fill missing at 2168 locations worldwide more than 275 000 daily discharge estimates. This task is...
Ephemeral streams flow only in direct response to precipitation and are ubiquitous landscape features. However, little is known about their influence on downstream rivers. Here, we modeled ephemeral stream water contributions the contiguous United States network of more than 20 million rivers, lakes, reservoirs, finding that contribute, average, 55% discharge exported from regional river systems, as defined by Geological Survey. Our results show connectivity a substantial pathway through...
Abstract At‐many‐stations hydraulic geometry (AMHG) is a recently discovered set of geomorphic relationships showing that the empirical parameters at‐a‐station (AHG) are functionally related along river. This conclusion seemingly refutes previous decades research defining AHG as spatially independent and site specific. Furthermore, AMHG was centerpiece an unprecedented recent methodology successfully estimated river discharge solely from satellite imagery. Despite these important...
Abstract The forthcoming Surface Water and Ocean Topography (SWOT) NASA satellite mission will measure water surface width, height, slope of major rivers worldwide. resulting data could provide an unprecedented account river discharge at continental scales, but reliable methods need to be identified prior launch. Here we present a novel algorithm for estimation from only remotely sensed stream slope, height multiple locations along mass‐conserved segment. algorithm, termed the Bayesian...
Abstract Conventional satellite platforms are limited in their ability to monitor rivers at fine spatial and temporal scales: suffering from unavoidable trade‐offs between resolutions. CubeSat constellations, however, can provide global data high resolutions, albeit with reduced spectral information. This study provides a first assessment of using for river discharge estimation both gauged ungauged settings. Discharge was estimated 11 Arctic sizes ranging 16 >1,000 m wide the Bayesian...
Abstract Recent advances in remote sensing and the upcoming launch of joint NASA/CNES/CSA/UKSA Surface Water Ocean Topography (SWOT) satellite point toward improved river discharge estimates ungauged basins. Existing methods rely on “prior knowledge” to infer parameters not directly measured from space. Here, we show that estimation is by classifying parameterizing rivers based their unique geomorphology hydraulics. Using over 370,000 situ hydraulic observations as training data, test...
Abstract Changes in a river's width reflect natural and anthropogenic impacts on local upstream/downstream hydraulic hydrologic processes. Temporal variation of river also biogeochemical exchange reflects geomorphologic evolution. However, while global maps mean dynamic water surface extent exist, there is currently no standardized assessment widths that documents changes over time. Therefore, we made repeated measurements from Landsat images for all rivers wider than 90 m collected 1984 to...