Richard Webb (Former Employee)
Science and Products
Filter Total Items: 37
Proceedings of the Fourth Interagency Conference on Research in the Watersheds—Observing, Studying, and Managing for Change 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...
Simulation of branched serial first-order decay of atrazine and metabolites in adapted and nonadapted soils 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. Jason Krutz, Dale L. Shaner
Potential climate change effects on water tables and pyrite oxidation in headwater catchments in Colorado 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 W. Clow, Donald H. Campbell
Agronomic and environmental implications of enhanced s-triazine degradation 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. Jason 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 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...
Identifying Hydrologic Processes in Agricultural Watersheds Using Precipitation-Runoff Models 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. T. Webb, Michael Wieczorek
Science and Products
Filter Total Items: 37
Proceedings of the Fourth Interagency Conference on Research in the Watersheds—Observing, Studying, and Managing for Change 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...
Simulation of branched serial first-order decay of atrazine and metabolites in adapted and nonadapted soils 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. Jason Krutz, Dale L. Shaner
Potential climate change effects on water tables and pyrite oxidation in headwater catchments in Colorado 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 W. Clow, Donald H. Campbell
Agronomic and environmental implications of enhanced s-triazine degradation 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. Jason 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 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...
Identifying Hydrologic Processes in Agricultural Watersheds Using Precipitation-Runoff Models 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. T. Webb, Michael Wieczorek