Lisa V. Lucas
Lisa Lucas is a Research General Engineer with the USGS Water Resources Mission Area.
- Performs mathematical modeling and data analysis for assessments, understanding, and prediction of water availability.
- Develops and applies mathematical models to understand and predict water flow, mixing, and water quality in surface water systems.
Science and Products
Filter Total Items: 32
Pulsey, patchy water quality in the delta: Implications for meaningful monitoring Pulsey, patchy water quality in the delta: Implications for meaningful monitoring
Valuable water quality and biological datasets have been gathered in the Sacramento-San Joaquin Delta for decades, most notably by the Interagency Ecological Program’s Environmental Monitoring Program (EMP). These extensive data have provided a means of analyzing and detecting long-term trends in water quality and ecosystem function (Jassby and others 2002; Kimmerer and Orsi 1996; Orsi...
Authors
Lisa Lucas, Tara Schraga, Cary B. Lopez, Jon Burau, Alan Jassby
A comment on the use of flushing time, residence time, and age as transport time scales A comment on the use of flushing time, residence time, and age as transport time scales
Applications of transport time scales are pervasive in biological, hydrologic, and geochemical studies yet these times scales are not consistently defined and applied with rigor in the literature. We compare three transport time scales (flushing time, age, and residence time) commonly used to measure the retention of water or scalar quantities transported with water. We identify the...
Authors
Nancy Monsen, James Cloern, Lisa Lucas, Stephen G. Monismith
Functional variability of habitats within the Sacramento-San Joaquin Delta: Restoration implications Functional variability of habitats within the Sacramento-San Joaquin Delta: Restoration implications
We have now entered an era of large-scale attempts to restore ecological functions and biological communities in impaired ecosystems. Our knowledge base of complex ecosystems and interrelated functions is limited, so the outcomes of specific restoration actions are highly uncertain. One approach for exploring that uncertainty and anticipating the range of possible restoration outcomes is
Authors
L.V. Lucas, J. E. Cloern, J.K. Thompson, N.E. Monsen
Effects of tidal shallowing and deepening on phytoplankton production dynamics: A modeling study Effects of tidal shallowing and deepening on phytoplankton production dynamics: A modeling study
Processes influencing estuarine phytoplankton growth occur over a range of time scales, but many conceptual and numerical models of estuarine phytoplankton production dynamics neglect mechanisms occurring on the shorter (e.g., intratidal) time scales. We used a numerical model to explore the influence of short time-scale variability in phytoplankton sources and sinks on long-term growth...
Authors
L.V. Lucas, J. E. Cloern
Processes governing phytoplankton blooms in estuaries. I: The local production-loss balance Processes governing phytoplankton blooms in estuaries. I: The local production-loss balance
The formation and spatial distribution of phytoplankton blooms in estuaries are controlled by (1) local mechanisms, which determine the production-loss balance for a water column at a particular spatial location (i.e. control if a bloom is possible), and (2) transport-related mechanisms, which govern biomass distribution (i.e. control if and where a bloom actually occurs). In this study...
Authors
L.V. Lucas, Jeffrey Koseff, J. E. Cloern, Stephen G. Monismith, J.K. Thompson
Processes governing phytoplankton blooms in estuaries. II: The role of horizontal transport Processes governing phytoplankton blooms in estuaries. II: The role of horizontal transport
The development and distribution of phytoplankton blooms in estuaries are functions of both local conditions (i.e. the production-loss balance for a water column at a particular spatial location) and large-scale horizontal transport. In this study, the second of a 2-paper series, we use a depth-averaged hydrodynamic-biological model to identify transport-related mechanisms impacting...
Authors
L.V. Lucas, Jeffrey Koseff, Stephen G. Monismith, J. E. Cloern, J.K. Thompson
Science and Products
Filter Total Items: 32
Pulsey, patchy water quality in the delta: Implications for meaningful monitoring Pulsey, patchy water quality in the delta: Implications for meaningful monitoring
Valuable water quality and biological datasets have been gathered in the Sacramento-San Joaquin Delta for decades, most notably by the Interagency Ecological Program’s Environmental Monitoring Program (EMP). These extensive data have provided a means of analyzing and detecting long-term trends in water quality and ecosystem function (Jassby and others 2002; Kimmerer and Orsi 1996; Orsi...
Authors
Lisa Lucas, Tara Schraga, Cary B. Lopez, Jon Burau, Alan Jassby
A comment on the use of flushing time, residence time, and age as transport time scales A comment on the use of flushing time, residence time, and age as transport time scales
Applications of transport time scales are pervasive in biological, hydrologic, and geochemical studies yet these times scales are not consistently defined and applied with rigor in the literature. We compare three transport time scales (flushing time, age, and residence time) commonly used to measure the retention of water or scalar quantities transported with water. We identify the...
Authors
Nancy Monsen, James Cloern, Lisa Lucas, Stephen G. Monismith
Functional variability of habitats within the Sacramento-San Joaquin Delta: Restoration implications Functional variability of habitats within the Sacramento-San Joaquin Delta: Restoration implications
We have now entered an era of large-scale attempts to restore ecological functions and biological communities in impaired ecosystems. Our knowledge base of complex ecosystems and interrelated functions is limited, so the outcomes of specific restoration actions are highly uncertain. One approach for exploring that uncertainty and anticipating the range of possible restoration outcomes is
Authors
L.V. Lucas, J. E. Cloern, J.K. Thompson, N.E. Monsen
Effects of tidal shallowing and deepening on phytoplankton production dynamics: A modeling study Effects of tidal shallowing and deepening on phytoplankton production dynamics: A modeling study
Processes influencing estuarine phytoplankton growth occur over a range of time scales, but many conceptual and numerical models of estuarine phytoplankton production dynamics neglect mechanisms occurring on the shorter (e.g., intratidal) time scales. We used a numerical model to explore the influence of short time-scale variability in phytoplankton sources and sinks on long-term growth...
Authors
L.V. Lucas, J. E. Cloern
Processes governing phytoplankton blooms in estuaries. I: The local production-loss balance Processes governing phytoplankton blooms in estuaries. I: The local production-loss balance
The formation and spatial distribution of phytoplankton blooms in estuaries are controlled by (1) local mechanisms, which determine the production-loss balance for a water column at a particular spatial location (i.e. control if a bloom is possible), and (2) transport-related mechanisms, which govern biomass distribution (i.e. control if and where a bloom actually occurs). In this study...
Authors
L.V. Lucas, Jeffrey Koseff, J. E. Cloern, Stephen G. Monismith, J.K. Thompson
Processes governing phytoplankton blooms in estuaries. II: The role of horizontal transport Processes governing phytoplankton blooms in estuaries. II: The role of horizontal transport
The development and distribution of phytoplankton blooms in estuaries are functions of both local conditions (i.e. the production-loss balance for a water column at a particular spatial location) and large-scale horizontal transport. In this study, the second of a 2-paper series, we use a depth-averaged hydrodynamic-biological model to identify transport-related mechanisms impacting...
Authors
L.V. Lucas, Jeffrey Koseff, Stephen G. Monismith, J. E. Cloern, J.K. Thompson