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Richard Webb (Former Employee)

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A boat docked near the Shingobee Headwaters research station.

Shingobee Headwaters Aquatic Ecosystems Project (SHAEP)

For 43 years, the Shingobee Headwaters Aquatic Ecosystems Project (SHAEP) brought together scientists from the USGS along with students and professors from universities in Minnesota, North Dakota, Wisconsin, and California to study the physical, chemical, and biological processes of lakes, wetlands, and streams at local and watershed scales. In early 2022, The University of Minnesota and Bemidji...
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Water Resources Mission Area
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Shingobee Headwaters Aquatic Ecosystems Project (SHAEP)

For 43 years, the Shingobee Headwaters Aquatic Ecosystems Project (SHAEP) brought together scientists from the USGS along with students and professors from universities in Minnesota, North Dakota, Wisconsin, and California to study the physical, chemical, and biological processes of lakes, wetlands, and streams at local and watershed scales. In early 2022, The University of Minnesota and Bemidji...
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Annotated bibliography of 64 papers reviewed and summarized in a conceptual framework to assess post-wildfire water quality

We conducted a scoping review to assess the current state of the science and knowledge gaps of post-wildfire water quality. A scoping review is a rapid, systematic approach that is more superficial compared to traditional reviews, and can be considered a preliminary study that informs future in-depth reviews, meta-analyses, or modelling efforts (Robinne et al., 2020). We developed a...
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Water Resources Mission Area

Webb and Rosenberry, 2020, MODFLOW 2005 and MODPATH 5 model data sets used to evaluate seepage-meter efficiency in high-permeability settings

A three-dimensional finite-difference model, MODFLOW-2005 (version 1.12.00), was developed to better understand how Seepage Meter efficiency changes when installed in sediments with wide range of conductivities. The hypothesis is that coarser sediments will allow a greater portion of upward-flow to flow around the meter instead of through it. The hypothetical model simulates upward flow...
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Water Resources Mission Area

Seepage meter efficiency in highly permeable settings source data (2020)

Efficiency of seepage meters, long considered a fixed property associated with the meter design, is not constant in highly permeable sediments. Instead, results from this study indicate that efficiency varies substantially with seepage-bag fullness, duration of bag attachment, depth of meter insertion into the sediments, and seepage velocity. Efficiency also varies substantially in...
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Water Resources Mission Area

Long-term hydrological and biological data from Williams and Shingobee Lakes, north-central Minnesota

The Shingobee Headwaters Aquatic Ecosystem Project is a long-term, multi-disciplinary monitoring and research study of a 28-square-kilometer headwaters watershed in north-central Minnesota that began in 1978. Emphasis is on processes related to hydrology, limnology, geochemistry, and watershed ecology and the land-water and atmosphere-water interfaces. Lakes are a substantial focus and...
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Water Resources Mission Area
Washed out bridge on the Rio Grande de Arecibo, Puerto Rico after Hurricane Georges, 1998
Washed out bridge on the Rio Grande de Arecibo, Puerto Rico
Washed out bridge on the Rio Grande de Arecibo, Puerto Rico
Washed out bridge on the Rio Grande de Arecibo, Puerto Rico after Hurricane Georges, 1998

Washed out bridge on the Rio Grande de Arecibo, Puerto Rico

Washed out bridge on the Rio Grande de Arecibo, Puerto Rico

Washed out bridge on the Rio Grande de Arecibo, Puerto Rico after Hurricane Georges, 1998

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Caribbean-Florida Water Science Center (CFWSC)
Washed out bridge on the Rio Grande de Arecibo, Puerto Rico after Hurricane Georges, 1998

Washed out bridge on the Rio Grande de Arecibo, Puerto Rico

Washed out bridge on the Rio Grande de Arecibo, Puerto Rico

Washed out bridge on the Rio Grande de Arecibo, Puerto Rico after Hurricane Georges, 1998

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Caribbean-Florida Water Science Center (CFWSC)
Filter Total Items: 37

A conceptual framework to assess post-wildfire water quality: State of the science and knowledge gaps

Wildfire substantially alters aquatic ecosystems by inducing moderate to catastrophic physical and chemical changes. However, the relations of environmental and watershed variables that drive those effects are complex. We present a Driver-Factor-Stressor-Effect (DFSE) conceptual framework to assess the current state of the science related to post-wildfire water-quality. We reviewed 64...
Authors
Sarah M. Elliott, Michelle I. Hornberger, Donald Rosenberry, Rebecca J. Frus, Richard M. Webb
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Water Resources Mission Area, Nevada Water Science Center, Upper Midwest Water Science Center

Variable seepage meter efficiency in high-permeability settings

The efficiency of seepage meters, long considered a fixed property associated with the meter design, is not constant in highly permeable sediments. Instead, efficiency varies substantially with seepage bag fullness, duration of bag attachment, depth of meter insertion into the sediments, and seepage velocity. Tests conducted in a seepage test tank filled with isotropic sand with a...
Authors
Donald Rosenberry, Jose M Nieto-Lopez, Richard M. Webb, Sascha Muller
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Water Resources Mission Area

Simulations of hydrology and water quality for irrigated fields near Yakima, Washington

Reliable tools are needed by farmers and managers to estimate and mitigate impacts of altered hydrology and degraded water quality downstream of agricultural areas. The Water, Energy, and Biogeochemical Model (WEBMOD) (Webb and Parkhurst 2017) was used to simulate daily variations of hydrology and water quality for 5 square kilometers of irrigated fields draining to the DR2 Drain...
Authors
Richard M. Webb
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Water Resources Mission Area

Holistic assessment of occurrence and fate of metolachlor within environmental compartments of agricultural watersheds

Background: Metolachlor [(RS)-2-Chloro-N-(2-ethyl-6-methyl-phenyl)-N-(1-methoxypropan-2-yl)acetamide] and two degradates (metolachlor ethane-sulfonic acid and metolachlor oxanilic acid) are commonly observed in surface and groundwater. The behavior and fate of these compounds were examined over a 12-year period in seven agricultural watersheds in the United States. They were quantified...
Authors
Claire E. Rose, Richard H. Coupe, Paul Capel, Richard M. Webb
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Lower Mississippi-Gulf Water Science Center

Water, Energy, and Biogeochemical Model (WEBMOD), user’s manual, version 1

The Water, Energy, and Biogeochemical Model (WEBMOD) uses the framework of the U.S. Geological Survey (USGS) Modular Modeling System to simulate fluxes of water and solutes through watersheds. WEBMOD divides watersheds into model response units (MRU) where fluxes and reactions are simulated for the following eight hillslope reservoir types: canopy; snowpack; ponding on impervious...
Authors
Richard M. Webb, David L. Parkhurst
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Water Resources Mission Area

PRMS-IV, the precipitation-runoff modeling system, version 4

Computer models that simulate the hydrologic cycle at a watershed scale facilitate assessment of variability in climate, biota, geology, and human activities on water availability and flow. This report describes an updated version of the Precipitation-Runoff Modeling System. The Precipitation-Runoff Modeling System is a deterministic, distributed-parameter, physical-process-based...
Authors
Steven L. Markstrom, R. Steve Regan, Lauren Hay, Roland J. Viger, Richard M. Webb, Robert A. Payn, Jacob LaFontaine

Proceedings of the Fourth Interagency Conference on Research in the Watersheds—Observing, Studying, and Managing for Change

These proceedings contain the abstracts, manuscripts, and posters of presentations given at the Fourth Interagency Conference on Research in the Watersheds—Observing, Studying, and Managing for Change, held at the Westmark Hotel in Fairbanks, Alaska, September 26–30, 2011. The conference was jointly hosted by the Bureau of Land Management and the National Park Service.Watersheds face...
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Water Resources Mission Area

Simulation of branched serial first-order decay of atrazine and metabolites in adapted and nonadapted soils

In the present study a branched serial first-order decay (BSFOD) model is presented and used to derive transformation rates describing the decay of a common herbicide, atrazine, and its metabolites observed in unsaturated soils adapted to previous atrazine applications and in soils with no history of atrazine applications. Calibration of BSFOD models for soils throughout the country can...
Authors
Richard M. Webb, Mark W. Sandstrom, L.J. Krutz, Dale L. Shaner
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Water Resources Mission Area, National Water Quality Laboratory

Potential climate change effects on water tables and pyrite oxidation in headwater catchments in Colorado

A water, energy, and biogeochemical model (WEBMOD) was constructed to simulate hydrology and pyrite oxidation for the period October 1992 through September 1997. The hydrologic model simulates processes in Loch Vale, a 6.6-km² granitic watershed that drains the east side of the Continental Divide. Parameters describing pyrite oxidation were derived sulfate concentrations measured in pore...
Authors
Richard M. Webb, M. Alisa Mast, Andrew H. Manning, David Clow, Donald H. Campbell

Agronomic and environmental implications of enhanced s-triazine degradation

Novel catabolic pathways enabling rapid detoxification of s-triazine herbicides have been elucidated and detected at a growing number of locations. The genes responsible for s-triazine mineralization, i.e. atzABCDEF and trzNDF, occur in at least four bacterial phyla and are implicated in the development of enhanced degradation in agricultural soils from all continents except Antarctica...
Authors
L.J. Krutz, Dale L. Shaner, Mark A. Weaver, Richard M. Webb, Robert M. Zablotowicz, Krishna N. Reddy, Yanbo Huang, Steven J. Thompson

Planning for an uncertain future - Monitoring, integration, and adaptation

The 6.7 billion human inhabitants of the earth have the ability to drastically alter ecosystems and the populations of species that have taken eons to evolve. By better understanding how our actions affect the environment, we stand a better chance of designing successful strategies to manage ecosystems sustainably. Toward this end, the Third Interagency Conference on Research in the...
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Ecosystems Mission Area, Water Resources Mission Area, Fort Collins Science Center, Geosciences and Environmental Change Science Center

Identifying Hydrologic Processes in Agricultural Watersheds Using Precipitation-Runoff Models

Understanding the fate and transport of agricultural chemicals applied to agricultural fields will assist in designing the most effective strategies to prevent water-quality impairments. At a watershed scale, the processes controlling the fate and transport of agricultural chemicals are generally understood only conceptually. To examine the applicability of conceptual models to the...
Authors
Joshua I. Linard, David M. Wolock, Richard M. Webb, Michael E. Wieczorek
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Water Resources Mission Area, Colorado Water Science Center

PHREEQC Version 3

PHREEQC Version 3 is a computer program for speciation, batch-reaction, one-dimensional transport, and inverse geochemical calculations.
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Water Resources Mission Area

PHAST - A Computer Program for Simulating Groundwater Flow, Solute Transport, and Multicomponent Geochemical Reactions

PHAST Is a computer program for simulating groundwater flow, solute transport, and multicomponent geochemical reactions.
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Water Resources Mission Area

Water, Energy, and Biogeochemical Model (WEBMOD)

The Water, Energy, and Biogeochemical Model (WEBMOD) uses the framework of the U.S. Geological Survey (USGS) Modular Modeling System (MMS) to simulate fluxes of water and solutes through watersheds. WEBMOD divides watersheds into model response units (MRU) where fluxes and reactions are simulated for several hillslope reservoir types.
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Water Resources Mission Area

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