George H. Allen
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View article: Satellite Requirements to Capture Water Propagation in Earth's Rivers
Satellite Requirements to Capture Water Propagation in Earth's Rivers Open
The water in Earth's rivers propagates as waves through space and time across hydrographic networks. A detailed understanding of river dynamics globally is essential for achieving accurate knowledge of surface water storage and fluxes to s…
View article: Phenological turnover matters when making trait‐based predictions of plant–pollinator interactions
Phenological turnover matters when making trait‐based predictions of plant–pollinator interactions Open
Understanding the processes determining species' interactions is key to predicting and safeguarding ecological networks under rapid environmental change. One approach to estimating interactions is to use morphologies of taxa interacting ac…
View article: The Surface Water and Ocean Topography Mission (SWOT) Prior Lake Database (PLD): Lake mask and operational auxiliaries
The Surface Water and Ocean Topography Mission (SWOT) Prior Lake Database (PLD): Lake mask and operational auxiliaries Open
View article: Mapping Reservoir Water Surface Area in the Contiguous United States Using the High‐Temporal Harmonized Landsat and Sentinel (HLS) Data at a Sub‐Weekly Time Scale
Mapping Reservoir Water Surface Area in the Contiguous United States Using the High‐Temporal Harmonized Landsat and Sentinel (HLS) Data at a Sub‐Weekly Time Scale Open
Traditional remote sensing techniques are limited in providing the necessary spatial and temporal resolution to capture the reservoir dynamics accurately. In this study, we introduce a novel algorithm to generate sub‐weekly reservoir surfa…
View article: Mapping the world's inland surface waters: an upgrade to the Global Lakes and Wetlands Database (GLWD v2)
Mapping the world's inland surface waters: an upgrade to the Global Lakes and Wetlands Database (GLWD v2) Open
In recognition of the importance of inland waters, numerous datasets mapping their extents, types, or changes have been created using sources ranging from historical wetland maps to real-time satellite remote sensing. However, differences …
View article: The Widths of Rivers and Streams Across Spatial Scales: A Framework for Improving River‐Atmosphere Biogeochemical Exchange Estimates
The Widths of Rivers and Streams Across Spatial Scales: A Framework for Improving River‐Atmosphere Biogeochemical Exchange Estimates Open
The width of rivers, and how it scales from narrow headwater streams to wide basin outlets, is a key yet highly uncertain parameter in estimating river‐atmosphere biogeochemical exchange. This study characterizes the full distribution of r…
View article: Satellite Altimetry-based Extension of global-scale in situ river discharge Measurements (SAEM)
Satellite Altimetry-based Extension of global-scale in situ river discharge Measurements (SAEM) Open
River discharge is a crucial measurement, indicating the volume of water flowing through a river cross-section at any given time. However, the existing network of river discharge gauges faces significant issues, largely due to the declinin…
View article: SWOT Captures Hydrologic Waves Traveling Down Rivers
SWOT Captures Hydrologic Waves Traveling Down Rivers Open
High discharge events propagate down rivers as flow waves. River wave movements are described theoretically by routing equations or tracked using in‐situ gauge measurements of stage over time at a given location. However, the sparse distri…
View article: A First Look at River Discharge Estimation From SWOT Satellite Observations
A First Look at River Discharge Estimation From SWOT Satellite Observations Open
The Surface Water and Ocean Topography (SWOT) satellite has the potential to transform global hydrologic science by offering simultaneous and synoptic estimates of river discharge and other hydraulic variables. Discharge is estimated from …
View article: Global River Topology (GRIT): A Bifurcating River Hydrography
Global River Topology (GRIT): A Bifurcating River Hydrography Open
Existing global river networks underpin a wide range of hydrological applications but do not represent channels with divergent river flows (bifurcations, multi‐threaded channels, canals), as these features defy the convergent flow assumpti…
View article: Spatial Hydrographs of River Flow and Their Analysis for Peak Event Detection in the Context of Satellite Sampling
Spatial Hydrographs of River Flow and Their Analysis for Peak Event Detection in the Context of Satellite Sampling Open
The study of river dynamics has long relied on the analysis of traditional in situ hydrographs. This graphical representation of temporal variability at a given location is so ubiquitous that the mere term “hydrograph” is widely recognized…
View article: Global Inland Water Greenhouse Gas Emissions: Patterns, Trends, and Anthropogenic Drivers
Global Inland Water Greenhouse Gas Emissions: Patterns, Trends, and Anthropogenic Drivers Open
Inland waters (streams, rivers, lakes, and reservoirs) are important sources of greenhouse gases (GHGs), including carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O), to the atmosphere. Their importance has been acknowledged in th…
View article: Estimating Wind Direction and Wind Speed Over Lakes With Surface Water Ocean Topography and Sentinel‐1 Satellite Observations
Estimating Wind Direction and Wind Speed Over Lakes With Surface Water Ocean Topography and Sentinel‐1 Satellite Observations Open
Wind at the water‐air interface is an important driver of hydrologic and biogeochemical processes in lakes. Satellite synthetic aperture radar (SAR) is commonly used over the ocean to retrieve wind fields using backscatter coefficients whi…
View article: The Surface Water and Ocean Topography Mission (SWOT) Prior Lake Database (PLD): Lake Mask and Operational Auxiliaries
The Surface Water and Ocean Topography Mission (SWOT) Prior Lake Database (PLD): Lake Mask and Operational Auxiliaries Open
Lakes are among the most prevalent and predominant water repositories on the Earth's land surface. A primary objective of the Surface Water and Ocean Topography (SWOT) satellite mission is to monitor surface water elevation, area, and stor…
View article: Ensemble estimates of global wetland methane emissions over 2000–2020
Ensemble estimates of global wetland methane emissions over 2000–2020 Open
Due to ongoing climate change, methane (CH4) emissions from vegetated wetlands are projected to increase during the 21st century, challenging climate mitigation efforts aimed at limiting global warming. However, despite reports of rising e…
View article: Phenological turnover matters when making trait-based predictions of plant-pollinator interactions
Phenological turnover matters when making trait-based predictions of plant-pollinator interactions Open
1. Understanding the processes determining species interactions is key to predicting and safeguarding ecological networks under rapid environmental change. One approach to estimating interactions is to use morphologies of taxa interacting …
View article: Progress towards satellite requirements to capture water propagation in Earth's rivers
Progress towards satellite requirements to capture water propagation in Earth's rivers Open
View article: Trends and meteorological drivers of extreme daily reservoir evaporation events in the western United States
Trends and meteorological drivers of extreme daily reservoir evaporation events in the western United States Open
View article: Lake-TopoCat: A global Lake drainage Topology and Catchment database
Lake-TopoCat: A global Lake drainage Topology and Catchment database Open
Contact: Md Safat Sikder ([email protected]), Jida Wang ([email protected]) Citation If you use Lake-TopoCat, please cite the following paper: Sikder, M. S., Wang, J., Allen, G. H., Sheng, Y., Yamazaki, D., Song, C., Ding, M., Crétaux…
View article: The Potential of Hydrogeodesy to Address Water‐Related and Sustainability Challenges
The Potential of Hydrogeodesy to Address Water‐Related and Sustainability Challenges Open
Increasing climatic and human pressures are changing the world's water resources and hydrological processes at unprecedented rates. Understanding these changes requires comprehensive monitoring of water resources. Hydrogeodesy, the science…
View article: The Potential of Hydrogeodesy to Address Water‐Related and Sustainability Challenges
The Potential of Hydrogeodesy to Address Water‐Related and Sustainability Challenges Open
Increasing climatic and human pressures are changing the world's water resources and hydrological processes at unprecedented rates. Understanding these changes requires comprehensive monitoring of water resources. Hydrogeodesy, the science…
View article: Satellite Altimetry-based Extension of global-scale in situ river discharge Measurements (SAEM)
Satellite Altimetry-based Extension of global-scale in situ river discharge Measurements (SAEM) Open
River discharge is a crucial measurement, indicating the volume of water flowing through a river cross-section at any given time. However, the existing network of river discharge gauges faces significant issues, largely due to the declinin…
View article: Biogeochemical and community ecology responses to the wetting of non-perennial streams
Biogeochemical and community ecology responses to the wetting of non-perennial streams Open
View article: Global Cloud Biases in Optical Satellite Remote Sensing of Rivers
Global Cloud Biases in Optical Satellite Remote Sensing of Rivers Open
Satellite imagery provides a global perspective for studying river hydrology and water quality, but clouds remain a fundamental limitation of optical sensors. Explicit studies of this problem were limited to specific locations or regions. …
View article: Mapping the world’s inland surface waters: an update to the Global Lakes and Wetlands Database (GLWD v2)
Mapping the world’s inland surface waters: an update to the Global Lakes and Wetlands Database (GLWD v2) Open
In recognition of the importance of inland waters, numerous datasets mapping their extents, types, or changes have been created using sources ranging from historical wetland maps to real-time satellite remote sensing. However, differences …
View article: Spatial Hydrographs of River Flow and their Analysis for Peak Event Detection in the Context of Satellite Sampling
Spatial Hydrographs of River Flow and their Analysis for Peak Event Detection in the Context of Satellite Sampling Open
The study of river dynamics has long relied on the analysis of traditional in situ hydrographs. This graphical representation of temporal variability at a given location is so ubiquitous that the mere term "hydrograph" is widely recognized…
View article: Ensemble estimates of global wetland methane emissions over 2000–2020
Ensemble estimates of global wetland methane emissions over 2000–2020 Open
Due to ongoing climate change, methane (CH4) emissions from vegetated wetlands are projected to increase during the 21st century, challenging climate mitigation efforts aimed at limiting global warming. However, despite reports of rising e…
View article: Supplementary material to "Ensemble estimates of global wetland methane emissions over 2000–2020"
Supplementary material to "Ensemble estimates of global wetland methane emissions over 2000–2020" Open
View article: Global patterns in river water storage dependent on residence time
Global patterns in river water storage dependent on residence time Open
Accurate assessment of global river flows and stores is critical for informing water management practices, but current estimates of global river flows exhibit substantial spread and estimates of river stores remain sparse. Estimates of riv…
View article: Global patterns in river water storage dependent on residence time
Global patterns in river water storage dependent on residence time Open
Accurate assessment of global river flows and stores is critical for informing water management practices, but current estimates of global river flows exhibit substantial spread and estimates of river stores remain sparse. Estimates of riv…