Mark N Landers (Former Employee)
Science and Products
Filter Total Items: 29
Surrogate analysis and index developer (SAID) tool and real-time data dissemination utilities Surrogate analysis and index developer (SAID) tool and real-time data dissemination utilities
The use of acoustic and other parameters as surrogates for suspended-sediment concentrations (SSC) in rivers has been successful in multiple applications across the Nation. Critical to advancing the operational use of surrogates are tools to process and evaluate the data along with the subsequent development of regression models from which real-time sediment concentrations can be made...
Authors
Marian M. Domanski, Timothy D. Straub, Molly S. Wood, Mark N. Landers, Gary R. Wall, Steven J. Brady
New information and guidance for collapsible bag-type sediment samplers New information and guidance for collapsible bag-type sediment samplers
Answers for many critical water-related issues require solid-phase water-quality data that are representative, accurate, and consistent. Collection of suspended sediment samples for subsequent analyses of solid-phase constituents that represent water-column sediment concentrations requires use of appropriate isokinetic samplers and sampling techniques (Davis, 2005a). Recent review of...
Authors
Mark N. Landers, Thomas A. Sabol, Michael A. Manning, Jessica R. Anderson, Corey Sannes
Comparison of fluvial suspended-sediment concentrations and particle-size distributions measured with in-stream laser diffraction and in physical samples Comparison of fluvial suspended-sediment concentrations and particle-size distributions measured with in-stream laser diffraction and in physical samples
Laser-diffraction technology, recently adapted for in-stream measurement of fluvial suspended-sediment concentrations (SSCs) and particle-size distributions (PSDs), was tested with a streamlined (SL), isokinetic version of the Laser In-Situ Scattering and Transmissometry (LISST) for measuring volumetric SSCs and PSDs ranging from 1.8-415 µm in 32 log-spaced size classes. Measured SSCs...
Authors
Jonathan A. Czuba, Timothy D. Straub, Christopher A. Curran, Mark N. Landers, Marian M. Domanski
Watershed characteristics and water-quality trends and loads in 12 watersheds in Gwinnett County, Georgia Watershed characteristics and water-quality trends and loads in 12 watersheds in Gwinnett County, Georgia
The U.S. Geological Survey, in cooperation with Gwinnett County Department of Water Resources, established a Long-Term Trend Monitoring (LTTM) program in 1996. The LTTM program is a comprehensive, long-term, water-quantity and water-quality monitoring program designed to document and analyze the hydrologic and water-quality conditions of selected watersheds of Gwinnett County, Georgia...
Authors
John K. Joiner, Brent T. Aulenbach, Mark N. Landers
Hysteresis in suspended sediment to turbidity relations due to changing particle size distributions Hysteresis in suspended sediment to turbidity relations due to changing particle size distributions
Turbidity (T) is the most ubiquitous of surrogate technologies used to estimate suspended-sediment concentration (SSC). The effects of sediment size on turbidity are well documented; however, effects from changes in particle size distributions (PSD) are rarely evaluated. Hysteresis in relations of SSC-to-turbidity (SSC~T) for single stormflow events was observed and quantified for a data...
Authors
Mark N. Landers, Terry W. Sturm
Total suspended solids concentrations and yields for water-quality monitoring stations in Gwinnett County, Georgia, 1996-2009 Total suspended solids concentrations and yields for water-quality monitoring stations in Gwinnett County, Georgia, 1996-2009
The U.S. Geological Survey, in cooperation with the Gwinnett County Department of Water Resources, established a water-quality monitoring program during late 1996 to collect comprehensive, consistent, high-quality data for use by watershed managers. As of 2009, continuous streamflow and water-quality data as well as discrete water-quality samples were being collected for 14 watershed...
Authors
Mark N. Landers
Science and Products
Filter Total Items: 29
Surrogate analysis and index developer (SAID) tool and real-time data dissemination utilities Surrogate analysis and index developer (SAID) tool and real-time data dissemination utilities
The use of acoustic and other parameters as surrogates for suspended-sediment concentrations (SSC) in rivers has been successful in multiple applications across the Nation. Critical to advancing the operational use of surrogates are tools to process and evaluate the data along with the subsequent development of regression models from which real-time sediment concentrations can be made...
Authors
Marian M. Domanski, Timothy D. Straub, Molly S. Wood, Mark N. Landers, Gary R. Wall, Steven J. Brady
New information and guidance for collapsible bag-type sediment samplers New information and guidance for collapsible bag-type sediment samplers
Answers for many critical water-related issues require solid-phase water-quality data that are representative, accurate, and consistent. Collection of suspended sediment samples for subsequent analyses of solid-phase constituents that represent water-column sediment concentrations requires use of appropriate isokinetic samplers and sampling techniques (Davis, 2005a). Recent review of...
Authors
Mark N. Landers, Thomas A. Sabol, Michael A. Manning, Jessica R. Anderson, Corey Sannes
Comparison of fluvial suspended-sediment concentrations and particle-size distributions measured with in-stream laser diffraction and in physical samples Comparison of fluvial suspended-sediment concentrations and particle-size distributions measured with in-stream laser diffraction and in physical samples
Laser-diffraction technology, recently adapted for in-stream measurement of fluvial suspended-sediment concentrations (SSCs) and particle-size distributions (PSDs), was tested with a streamlined (SL), isokinetic version of the Laser In-Situ Scattering and Transmissometry (LISST) for measuring volumetric SSCs and PSDs ranging from 1.8-415 µm in 32 log-spaced size classes. Measured SSCs...
Authors
Jonathan A. Czuba, Timothy D. Straub, Christopher A. Curran, Mark N. Landers, Marian M. Domanski
Watershed characteristics and water-quality trends and loads in 12 watersheds in Gwinnett County, Georgia Watershed characteristics and water-quality trends and loads in 12 watersheds in Gwinnett County, Georgia
The U.S. Geological Survey, in cooperation with Gwinnett County Department of Water Resources, established a Long-Term Trend Monitoring (LTTM) program in 1996. The LTTM program is a comprehensive, long-term, water-quantity and water-quality monitoring program designed to document and analyze the hydrologic and water-quality conditions of selected watersheds of Gwinnett County, Georgia...
Authors
John K. Joiner, Brent T. Aulenbach, Mark N. Landers
Hysteresis in suspended sediment to turbidity relations due to changing particle size distributions Hysteresis in suspended sediment to turbidity relations due to changing particle size distributions
Turbidity (T) is the most ubiquitous of surrogate technologies used to estimate suspended-sediment concentration (SSC). The effects of sediment size on turbidity are well documented; however, effects from changes in particle size distributions (PSD) are rarely evaluated. Hysteresis in relations of SSC-to-turbidity (SSC~T) for single stormflow events was observed and quantified for a data...
Authors
Mark N. Landers, Terry W. Sturm
Total suspended solids concentrations and yields for water-quality monitoring stations in Gwinnett County, Georgia, 1996-2009 Total suspended solids concentrations and yields for water-quality monitoring stations in Gwinnett County, Georgia, 1996-2009
The U.S. Geological Survey, in cooperation with the Gwinnett County Department of Water Resources, established a water-quality monitoring program during late 1996 to collect comprehensive, consistent, high-quality data for use by watershed managers. As of 2009, continuous streamflow and water-quality data as well as discrete water-quality samples were being collected for 14 watershed...
Authors
Mark N. Landers