Many rivers have been channelized and straightened in large parts of the world in the past centuries. These measures were taken to drain the land, to produce hydropower, to enhance navigation and to reduce bank erosion. However, in the last decades, realization has grown that ch…
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Meandering rivers across the globe present a striking similarity in their alignment, and this pattern has intrigued scientific curiosity for almost a century. However, still very little is known about ‘unconventional’ river meanders with a “zigzagging” planform appearance, but w…
Spatial and temporal patterns of biodiversity are shaped, in part, by the resources available to biota, the efficiency of resource transfer through the food web, and variation in environmental conditions. Stream and riparian zones are dynamic systems connected through reciprocal…
The McMurdo Dry Valleys (MDV) are a frigid, hyperarid desert of Antarctica with a landscape dominated by ice-rich permafrost. This research focuses on using two ice-rich permafrost cores collected from the MDV to study chemical processes (Beacon Valley core) and the timing of MD…
Small alluvial streams (~100km2 drainage area) are important for water resources and aquatic habitat. Small streams throughout the Western United States are impacted by anthropogenic land-use including urban development, mining, logging, beaver trapping, grazing, and farming. La…
José W. PimentelThe Iglesia de Dios Comunidad de Esperanza in Cleveland, Tennessee is a Hispanic Pentecostal Church composed mainly of first-generation Spanish-speaking congregants. The congregation is an ethnically diverse Hispanic group represented by Mexicans, Puerto Ricans, …
The conditions beneath glaciers and ice-sheets including the topography, hydrology, and geology are essential for understanding ice dynamics, interpreting ice-sheet history, and predicting ice-sheet retreat and sea-level-rise in response to a changing climate. Located in remote …
Data assimilation in subsurface systems is challenging due to the large number of flow simulations often required, and by the need to preserve geological realism in the calibrated (posterior) models. In this work we present a deep-learning-based surrogate-modeling framework, ref…
Inverse problems in subsurface flow are generally challenging due to the need for a large number of expensive numerical solutions to partial di↵erential equations (PDEs). Inverse modeling typically consists of generating realizations of the unknown model parameters and matching …
Using the onset of bedload transport as a predictive metric of channel equilibrium is complicated by observations that, in addition to discharge, initial sediment mobility and subsequent sediment flux depend upon a variety of conditions including the grain size distribution on t…
The management and protection of National Wildlife Refuges (NWRs) requires local and regional inventories and assessments for the biological, physical, chemical, and hydrologic resources of each unit. Water resource Inventories and Assessments (WRIAs) are compiled by the U.S. Fi…
Understanding the temporal and depth-related spatial controls on microbial functional redundancy and community interactions remains a central issue in microbial ecology and Critical Zone science. Microorganisms are influenced by and influence biogeochemical reactions in the soil…
Small dams account for 96% of the more than 50,000 anthropogenic structures on rivers in the United States (US). While dams are critical pieces of infrastructure to human systems, they have contributed to the decline of river connectivity by regulating streamflow dynamics and fr…
Accurate hydrologic modeling of ungauged mountain basins plays an important role in ensuring the safety of Colorado’s dams. Recent research has shown that infiltration-excess runoff, saturation-excess runoff, and subsurface stormflow can all contribute to streamflow from major s…
The combination of 10 years of drought in the Chilean Andes and an increased demand water supply and agricultural activities has created the need for better forecasts to inform water management and decision making. The existing water supply forecasts have been insufficient for t…
In the contiguous United States (CONUS), there are over 52,000 reservoirs ranging from 0.5 to 243 meters high. Collectively they hold 600,000 MCM of water. These structures have dramatically affected the river dynamics of every major watershed in the country. The operations of t…
Snow water equivalent (SWE) measurements are critical for creating flood and drought outlooks in the spring. These data are abundantly collected throughout the winter and spring months and reported to organizations like the National Weather Service to use in their products. Orga…
The Columbia River basin is a large transboundary basin located in the Pacific Northwest, straddling the US-Canadian border. The basin spans seven US states and one Canadian province, encompassing a diverse range of hydroclimates. Strong seasonality and complex topography, combi…
Baseflow is the portion of streamflow that comes from groundwater and other delayed sources. Although baseflow is essential for sustaining streams during low flow and drought periods, we have little information about if it has changed across the U.S. Midwest. The region represen…