Richard G Niswonger (Former Employee)
Science and Products
Filter Total Items: 17
GSFLOW: Coupled Groundwater and Surface-Water Flow Model, version 2.2.0 GSFLOW: Coupled Groundwater and Surface-Water Flow Model, version 2.2.0
GSFLOW is a coupled Groundwater and Surface-Water Flow model based on the integration of the U.S. Geological Survey Precipitation-Runoff Modeling System (PRMS; Markstrom and others, 2015) and the U.S. Geological Survey Modular Groundwater Flow Model (MODFLOW-2005, Harbaugh, 2005; MODFLOW-NWT, Niswonger and others, 2011). In addition to the basic PRMS and MODFLOW simulation methods...
pyGSFLOW v1.0.0 pyGSFLOW v1.0.0
Python package software release for pyGSFLOW. pyGSFLOW is a python package to create, read, write, edit, and visualize GSFLOW models. Source code, examples, installation instructions, and documentation can be found at https://github.com/pygsflow/pygsflow
GSFLOW and MODSIM-GSFLOW model used to evaluate the potential effects of increased temperature on the Carson Valley watershed and agricultural system in eastern California and western Nevada GSFLOW and MODSIM-GSFLOW model used to evaluate the potential effects of increased temperature on the Carson Valley watershed and agricultural system in eastern California and western Nevada
The USGS developed an integrated river operations-groundwater model using GSFLOW and MODSIM GSFLOW to simulate streamflow derived from snowmelt, the distribution of surface water based on the existing prior appropriations water doctrine, supplemental pumping in response to surface water shortfalls, and the resulting surface water-groundwater interactions in the Carson Valley in...
GSFLOW: Coupled Groundwater and Surface-Water Flow Model, version 2.1.0 GSFLOW: Coupled Groundwater and Surface-Water Flow Model, version 2.1.0
GSFLOW is a coupled Groundwater and Surface-water FLOW model based on the integration of the USGS Precipitation-Runoff Modeling System (PRMS-V) and the USGS Modular Groundwater Flow Model (MODFLOW-2005 and MODFLOW-NWT). GSFLOW was developed to simulate coupled groundwater/surface-water flow in one or more watersheds by simultaneously simulating flow across the land surface, within...
Nitrogen and phosphorus, other water quality parameters, and sediment temperature data for Incline Creek and Marlette Creek stream-lake interface, Lake Tahoe, Nevada, September 2013 Nitrogen and phosphorus, other water quality parameters, and sediment temperature data for Incline Creek and Marlette Creek stream-lake interface, Lake Tahoe, Nevada, September 2013
This data set contains the following parameters: sediment and water temperature, dissolved nitrate plus nitrite dissolved, ammonium, total Kjeldahl nitrogen, soluble orthophosphate, dissolved phosphorus, total phosphorus, and dissolved organic carbon.
Filter Total Items: 63
Integrated hydrologic model development and postprocessing for GSFLOW using pyGSFLOW Integrated hydrologic model development and postprocessing for GSFLOW using pyGSFLOW
pyGSFLOW is a python package designed to create new GSFLOW integrated hydrologic models, read existing models, edit model input data, run GSFLOW models, process output, and visualize model data.
Authors
Joshua Larsen, Ayman H. Alzraiee, Richard G. Niswonger
Integrated hydrology and operations modeling to evaluate climate change impacts in an agricultural valley irrigated with snowmelt runoff Integrated hydrology and operations modeling to evaluate climate change impacts in an agricultural valley irrigated with snowmelt runoff
Applying models to developed agricultural regions remains a difficult problem because there are no existing modeling codes that represent both the complex physics of the hydrology and anthropogenic manipulations to water distribution and consumption. We apply an integrated groundwater – surface water and hydrologic river operations model to an irrigated river valley in northwestern...
Authors
Wesley Kitlasten, Eric D. Morway, Richard G. Niswonger, Murphy Gardner, Jeremy T. White, Enrique Triana, David J. Selkowitz
Baseflow age distributions and depth of active groundwater flow in a snow‐dominated mountain headwater basin Baseflow age distributions and depth of active groundwater flow in a snow‐dominated mountain headwater basin
Deeper flows through bedrock in mountain watersheds could be important, but lack of data to characterize bedrock properties limits understanding. To address data scarcity, we combine a previously published integrated hydrologic model of a snow‐dominated, headwater basin of the Colorado River with a new method for dating baseflow age using dissolved gas tracers SF6, CFC‐113, N2, and Ar...
Authors
Rosemary W.H. Carroll, Andrew H. Manning, Richard G. Niswonger, David W Marchetti, Kenneth H. Williams
An agricultural water use package for MODFLOW and GSFLOW An agricultural water use package for MODFLOW and GSFLOW
The Agricultural Water Use (AG) Package was developed for simulating demand-driven and supply-constrained agricultural water use in MODFLOW and GSFLOW models. The AG Package uses pre-existing hydrologic simulation provided by MODFLOW and GSFLOW. Three options are available for simulating water use for agriculture: (1) user-specified demands, (2) demands determined by a user-specified...
Authors
Richard G. Niswonger
Managed aquifer recharge in snow-fed river basins: What, why and how? Managed aquifer recharge in snow-fed river basins: What, why and how?
What does climate change mean for snow-fed river basins? Climate change poses unique challenges in snow-fed river basins across the western United States because the majority of water supply originates as snow (Dettinger, Udall, & Georgakakos, 2015). In the Sierra Nevada, recent observations include changes in snow accumulation and snowmelt, and shifts in peak streamflow timing (Barnhart...
Authors
Kelley Sterle, Wesley Kitlasten, Eric D. Morway, Richard G. Niswonger, Loretta Singletary
Linkages between hydrology and seasonal variations of nutrients and periphyton in a large oligotrophic subalpine lake Linkages between hydrology and seasonal variations of nutrients and periphyton in a large oligotrophic subalpine lake
Periphyton is important to lake ecosystems, contributing to primary production, nutrient cycling, and benthic metabolism. Increases in periphyton growth in lakes can be indicative of changes in water quality, shifts in ecosystem structure, and increases in nutrient fluxes. In oligotrophic lakes, conservationists are interested in characterizing the influence of hydrological drivers on...
Authors
Ramon C. Naranjo, Richard G. Niswonger, David Smith, Donald O. Rosenberry, Sudeep Chandra
Science and Products
Filter Total Items: 17
GSFLOW: Coupled Groundwater and Surface-Water Flow Model, version 2.2.0 GSFLOW: Coupled Groundwater and Surface-Water Flow Model, version 2.2.0
GSFLOW is a coupled Groundwater and Surface-Water Flow model based on the integration of the U.S. Geological Survey Precipitation-Runoff Modeling System (PRMS; Markstrom and others, 2015) and the U.S. Geological Survey Modular Groundwater Flow Model (MODFLOW-2005, Harbaugh, 2005; MODFLOW-NWT, Niswonger and others, 2011). In addition to the basic PRMS and MODFLOW simulation methods...
pyGSFLOW v1.0.0 pyGSFLOW v1.0.0
Python package software release for pyGSFLOW. pyGSFLOW is a python package to create, read, write, edit, and visualize GSFLOW models. Source code, examples, installation instructions, and documentation can be found at https://github.com/pygsflow/pygsflow
GSFLOW and MODSIM-GSFLOW model used to evaluate the potential effects of increased temperature on the Carson Valley watershed and agricultural system in eastern California and western Nevada GSFLOW and MODSIM-GSFLOW model used to evaluate the potential effects of increased temperature on the Carson Valley watershed and agricultural system in eastern California and western Nevada
The USGS developed an integrated river operations-groundwater model using GSFLOW and MODSIM GSFLOW to simulate streamflow derived from snowmelt, the distribution of surface water based on the existing prior appropriations water doctrine, supplemental pumping in response to surface water shortfalls, and the resulting surface water-groundwater interactions in the Carson Valley in...
GSFLOW: Coupled Groundwater and Surface-Water Flow Model, version 2.1.0 GSFLOW: Coupled Groundwater and Surface-Water Flow Model, version 2.1.0
GSFLOW is a coupled Groundwater and Surface-water FLOW model based on the integration of the USGS Precipitation-Runoff Modeling System (PRMS-V) and the USGS Modular Groundwater Flow Model (MODFLOW-2005 and MODFLOW-NWT). GSFLOW was developed to simulate coupled groundwater/surface-water flow in one or more watersheds by simultaneously simulating flow across the land surface, within...
Nitrogen and phosphorus, other water quality parameters, and sediment temperature data for Incline Creek and Marlette Creek stream-lake interface, Lake Tahoe, Nevada, September 2013 Nitrogen and phosphorus, other water quality parameters, and sediment temperature data for Incline Creek and Marlette Creek stream-lake interface, Lake Tahoe, Nevada, September 2013
This data set contains the following parameters: sediment and water temperature, dissolved nitrate plus nitrite dissolved, ammonium, total Kjeldahl nitrogen, soluble orthophosphate, dissolved phosphorus, total phosphorus, and dissolved organic carbon.
Filter Total Items: 63
Integrated hydrologic model development and postprocessing for GSFLOW using pyGSFLOW Integrated hydrologic model development and postprocessing for GSFLOW using pyGSFLOW
pyGSFLOW is a python package designed to create new GSFLOW integrated hydrologic models, read existing models, edit model input data, run GSFLOW models, process output, and visualize model data.
Authors
Joshua Larsen, Ayman H. Alzraiee, Richard G. Niswonger
Integrated hydrology and operations modeling to evaluate climate change impacts in an agricultural valley irrigated with snowmelt runoff Integrated hydrology and operations modeling to evaluate climate change impacts in an agricultural valley irrigated with snowmelt runoff
Applying models to developed agricultural regions remains a difficult problem because there are no existing modeling codes that represent both the complex physics of the hydrology and anthropogenic manipulations to water distribution and consumption. We apply an integrated groundwater – surface water and hydrologic river operations model to an irrigated river valley in northwestern...
Authors
Wesley Kitlasten, Eric D. Morway, Richard G. Niswonger, Murphy Gardner, Jeremy T. White, Enrique Triana, David J. Selkowitz
Baseflow age distributions and depth of active groundwater flow in a snow‐dominated mountain headwater basin Baseflow age distributions and depth of active groundwater flow in a snow‐dominated mountain headwater basin
Deeper flows through bedrock in mountain watersheds could be important, but lack of data to characterize bedrock properties limits understanding. To address data scarcity, we combine a previously published integrated hydrologic model of a snow‐dominated, headwater basin of the Colorado River with a new method for dating baseflow age using dissolved gas tracers SF6, CFC‐113, N2, and Ar...
Authors
Rosemary W.H. Carroll, Andrew H. Manning, Richard G. Niswonger, David W Marchetti, Kenneth H. Williams
An agricultural water use package for MODFLOW and GSFLOW An agricultural water use package for MODFLOW and GSFLOW
The Agricultural Water Use (AG) Package was developed for simulating demand-driven and supply-constrained agricultural water use in MODFLOW and GSFLOW models. The AG Package uses pre-existing hydrologic simulation provided by MODFLOW and GSFLOW. Three options are available for simulating water use for agriculture: (1) user-specified demands, (2) demands determined by a user-specified...
Authors
Richard G. Niswonger
Managed aquifer recharge in snow-fed river basins: What, why and how? Managed aquifer recharge in snow-fed river basins: What, why and how?
What does climate change mean for snow-fed river basins? Climate change poses unique challenges in snow-fed river basins across the western United States because the majority of water supply originates as snow (Dettinger, Udall, & Georgakakos, 2015). In the Sierra Nevada, recent observations include changes in snow accumulation and snowmelt, and shifts in peak streamflow timing (Barnhart...
Authors
Kelley Sterle, Wesley Kitlasten, Eric D. Morway, Richard G. Niswonger, Loretta Singletary
Linkages between hydrology and seasonal variations of nutrients and periphyton in a large oligotrophic subalpine lake Linkages between hydrology and seasonal variations of nutrients and periphyton in a large oligotrophic subalpine lake
Periphyton is important to lake ecosystems, contributing to primary production, nutrient cycling, and benthic metabolism. Increases in periphyton growth in lakes can be indicative of changes in water quality, shifts in ecosystem structure, and increases in nutrient fluxes. In oligotrophic lakes, conservationists are interested in characterizing the influence of hydrological drivers on...
Authors
Ramon C. Naranjo, Richard G. Niswonger, David Smith, Donald O. Rosenberry, Sudeep Chandra