Bruce Jaffe (Former Employee)
Science and Products
Filter Total Items: 13
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Filter Total Items: 86
Mudflat morphodynamics and the impact of sea level rise in South San Francisco Bay
Estuarine tidal mudflats form unique habitats and maintain valuable ecosystems. Historic measurements of a mudflat in San Fancsico Bay over the past 150 years suggest the development of a rather stable mudflat profile. This raises questions on its origin and governing processes as well as on the mudflats’ fate under scenarios of sea level rise and decreasing sediment supply. We developed a 1D morp
Authors
Mick Van der Wegen, Bruce E. Jaffe, Amy C. Foxgrover, Dano Roelvink
Uncertainty in tsunami sediment transport modeling
Erosion and deposition from tsunamis record information about tsunami hydrodynamics and size that can be interpreted to improve tsunami hazard assessment. We explore sources and methods for quantifying uncertainty in tsunami sediment transport modeling. Uncertainty varies with tsunami, study site, available input data, sediment grain size, and model. Although uncertainty has the potential to be la
Authors
Bruce E. Jaffe, Kazuhisa Goto, Daisuke Sugawara, Guy R. Gelfenbaum, SeanPaul M. La Selle
The role of suspension events in cross-shore and longshore suspended sediment transport in the surf zone
Suspension of sand in the surf zone is intermittent. Especially striking in a time series of concentration are periods of intense suspension, suspension events, when the water column suspended sediment concentration is an order of magnitude greater than the mean concentration. The prevalence, timing, and contribution of suspension events to cross-shore and longshore suspended sediment transport ar
Authors
Bruce E. Jaffe
Tsunami geology in paleoseismology
The 2004 Indian Ocean and 2011 Tohoku-oki disasters dramatically demonstrated the destructiveness and deadliness of tsunamis. For the assessment of future risk posed by tsunamis it is necessary to understand past tsunami events. Recent work on tsunami deposits has provided new information on paleotsunami events, including their recurrence interval and the size of the tsunamis (e.g. [187–189]). Tsu
Authors
Yuichi Nishimura, Bruce E. Jaffe
Late Holocene sedimentary environments of south San Francisco Bay, California, illustrated in gravity cores
Data are reported here from 51 gravity cores collected from the southern part of San Francisco Bay by the U.S. Geological Survey in 1990. The sedimentary record in the cores demonstrates a stable geographic distribution of facies and spans a few thousand years. Carbon-14 dating of the sediments suggests that sedimentation rates average about 1 mm/yr. The geometry of the bay floor and the character
Authors
Donald L. Woodrow, Theresa A. Fregoso, Florence L. Wong, Bruce E. Jaffe
Sedimentary organic biomarkers suggest detrimental effects of PAHs on estuarine microbial biomass during the 20th century in San Francisco Bay, CA, USA
Hydrocarbon contaminants are ubiquitous in urban aquatic ecosystems, and the ability of some microbial strains to degrade certain polycyclic aromatic hydrocarbons (PAHs) is well established. However, detrimental effects of petroleum hydrocarbon contamination on nondegrader microbial populations and photosynthetic organisms have not often been considered. In the current study, fatty acid methyl est
Authors
Elena B. Nilsen, Robert J. Rosenbauer, Christopher C. Fuller, Bruce E. Jaffe
Factors controlling floc settling velocity along a longitudinal estuarine transect
A 147 km longitudinal transect of flocculated cohesive sediment properties in San Francisco Bay (SFB) was conducted on June 17th, 2008. Our aim was to determine the factors that control floc settling velocity along the longitudinal axis of the estuary. The INSSEV-LF video system was used to measure floc diameters and settling velocities at 30 stations at a distance of 0.7 m above the estuary bed.
Authors
A.J. Manning, David H. Schoellhamer
Does centennial morphodynamic evolution lead to higher channel efficiency in San Pablo Bay, California?
Measured bathymetries on 30 year interval over the past 150 years show that San Pablo Bay experienced periods of considerable deposition followed by periods of net erosion. However, the main channel in San Pablo Bay has continuously narrowed. The underlying mechanisms and consequences of this tidal channel evolution are not well understood.
The central question of this study is whether tidal chan
Authors
M. van der Wegen, Bruce E. Jaffe
Influence of history and environment on the sediment dynamics of intertidal flats
Morphological trends of three distinct intertidal environments in South San Francisco Bay were investigated using a combination of measurement and modeling tools. Because of the inherent relationship between the physical environment and the sediment properties, the sediment properties provide a good indicator of morphologic trends. A significant finding of this study is that surface sediment erodi
Authors
Craig A. Jones, Bruce E. Jaffe
Comparison of sediment supply to San Francisco Bay from watersheds draining the Bay Area and the Central Valley of California
Quantifying suspended sediment loads is important for managing the world's estuaries in the context of navigation, pollutant transport, wetland restoration, and coastal erosion. To address these needs, a comprehensive analysis was completed on sediment supply to San Francisco Bay from fluvial sources. Suspended sediment, optical backscatter, velocity data near the head of the estuary, and discharg
Authors
L.J. McKee, M. Lewicki, David H. Schoellhamer, Neil K. Ganju
Understanding processes controlling sediment transports at the mouth of a highly energetic inlet system (San Francisco Bay, CA)
San Francisco Bay is one of the largest estuaries along the U.S. West Coast and is linked to the Pacific Ocean through the Golden Gate, a 100 m deep bedrock inlet. A coupled wave, flow and sediment transport model is used to quantify the sediment linkages between San Francisco Bay, the Golden Gate, and the adjacent open coast. Flow and sediment transport processes are investigated using an ensembl
Authors
Edwin P.L. Elias, Jeff E. Hansen
The use of modeling and suspended sediment concentration measurements for quantifying net suspended sediment transport through a large tidally dominated inlet
Sediment exchange at large energetic inlets is often difficult to quantify due complex flows, massive amounts of water and sediment exchange, and environmental conditions limiting long-term data collection. In an effort to better quantify such exchange this study investigated the use of suspended sediment concentrations (SSC) measured at an offsite location as a surrogate for sediment exchange at
Authors
Li H. Erikson, Scott A. Wright, Edwin Elias, Daniel M. Hanes, David H. Schoellhamer, John Largier
Science and Products
Filter Total Items: 13
No Result Found
Filter Total Items: 86
Mudflat morphodynamics and the impact of sea level rise in South San Francisco Bay
Estuarine tidal mudflats form unique habitats and maintain valuable ecosystems. Historic measurements of a mudflat in San Fancsico Bay over the past 150 years suggest the development of a rather stable mudflat profile. This raises questions on its origin and governing processes as well as on the mudflats’ fate under scenarios of sea level rise and decreasing sediment supply. We developed a 1D morp
Authors
Mick Van der Wegen, Bruce E. Jaffe, Amy C. Foxgrover, Dano Roelvink
Uncertainty in tsunami sediment transport modeling
Erosion and deposition from tsunamis record information about tsunami hydrodynamics and size that can be interpreted to improve tsunami hazard assessment. We explore sources and methods for quantifying uncertainty in tsunami sediment transport modeling. Uncertainty varies with tsunami, study site, available input data, sediment grain size, and model. Although uncertainty has the potential to be la
Authors
Bruce E. Jaffe, Kazuhisa Goto, Daisuke Sugawara, Guy R. Gelfenbaum, SeanPaul M. La Selle
The role of suspension events in cross-shore and longshore suspended sediment transport in the surf zone
Suspension of sand in the surf zone is intermittent. Especially striking in a time series of concentration are periods of intense suspension, suspension events, when the water column suspended sediment concentration is an order of magnitude greater than the mean concentration. The prevalence, timing, and contribution of suspension events to cross-shore and longshore suspended sediment transport ar
Authors
Bruce E. Jaffe
Tsunami geology in paleoseismology
The 2004 Indian Ocean and 2011 Tohoku-oki disasters dramatically demonstrated the destructiveness and deadliness of tsunamis. For the assessment of future risk posed by tsunamis it is necessary to understand past tsunami events. Recent work on tsunami deposits has provided new information on paleotsunami events, including their recurrence interval and the size of the tsunamis (e.g. [187–189]). Tsu
Authors
Yuichi Nishimura, Bruce E. Jaffe
Late Holocene sedimentary environments of south San Francisco Bay, California, illustrated in gravity cores
Data are reported here from 51 gravity cores collected from the southern part of San Francisco Bay by the U.S. Geological Survey in 1990. The sedimentary record in the cores demonstrates a stable geographic distribution of facies and spans a few thousand years. Carbon-14 dating of the sediments suggests that sedimentation rates average about 1 mm/yr. The geometry of the bay floor and the character
Authors
Donald L. Woodrow, Theresa A. Fregoso, Florence L. Wong, Bruce E. Jaffe
Sedimentary organic biomarkers suggest detrimental effects of PAHs on estuarine microbial biomass during the 20th century in San Francisco Bay, CA, USA
Hydrocarbon contaminants are ubiquitous in urban aquatic ecosystems, and the ability of some microbial strains to degrade certain polycyclic aromatic hydrocarbons (PAHs) is well established. However, detrimental effects of petroleum hydrocarbon contamination on nondegrader microbial populations and photosynthetic organisms have not often been considered. In the current study, fatty acid methyl est
Authors
Elena B. Nilsen, Robert J. Rosenbauer, Christopher C. Fuller, Bruce E. Jaffe
Factors controlling floc settling velocity along a longitudinal estuarine transect
A 147 km longitudinal transect of flocculated cohesive sediment properties in San Francisco Bay (SFB) was conducted on June 17th, 2008. Our aim was to determine the factors that control floc settling velocity along the longitudinal axis of the estuary. The INSSEV-LF video system was used to measure floc diameters and settling velocities at 30 stations at a distance of 0.7 m above the estuary bed.
Authors
A.J. Manning, David H. Schoellhamer
Does centennial morphodynamic evolution lead to higher channel efficiency in San Pablo Bay, California?
Measured bathymetries on 30 year interval over the past 150 years show that San Pablo Bay experienced periods of considerable deposition followed by periods of net erosion. However, the main channel in San Pablo Bay has continuously narrowed. The underlying mechanisms and consequences of this tidal channel evolution are not well understood.
The central question of this study is whether tidal chan
Authors
M. van der Wegen, Bruce E. Jaffe
Influence of history and environment on the sediment dynamics of intertidal flats
Morphological trends of three distinct intertidal environments in South San Francisco Bay were investigated using a combination of measurement and modeling tools. Because of the inherent relationship between the physical environment and the sediment properties, the sediment properties provide a good indicator of morphologic trends. A significant finding of this study is that surface sediment erodi
Authors
Craig A. Jones, Bruce E. Jaffe
Comparison of sediment supply to San Francisco Bay from watersheds draining the Bay Area and the Central Valley of California
Quantifying suspended sediment loads is important for managing the world's estuaries in the context of navigation, pollutant transport, wetland restoration, and coastal erosion. To address these needs, a comprehensive analysis was completed on sediment supply to San Francisco Bay from fluvial sources. Suspended sediment, optical backscatter, velocity data near the head of the estuary, and discharg
Authors
L.J. McKee, M. Lewicki, David H. Schoellhamer, Neil K. Ganju
Understanding processes controlling sediment transports at the mouth of a highly energetic inlet system (San Francisco Bay, CA)
San Francisco Bay is one of the largest estuaries along the U.S. West Coast and is linked to the Pacific Ocean through the Golden Gate, a 100 m deep bedrock inlet. A coupled wave, flow and sediment transport model is used to quantify the sediment linkages between San Francisco Bay, the Golden Gate, and the adjacent open coast. Flow and sediment transport processes are investigated using an ensembl
Authors
Edwin P.L. Elias, Jeff E. Hansen
The use of modeling and suspended sediment concentration measurements for quantifying net suspended sediment transport through a large tidally dominated inlet
Sediment exchange at large energetic inlets is often difficult to quantify due complex flows, massive amounts of water and sediment exchange, and environmental conditions limiting long-term data collection. In an effort to better quantify such exchange this study investigated the use of suspended sediment concentrations (SSC) measured at an offsite location as a surrogate for sediment exchange at
Authors
Li H. Erikson, Scott A. Wright, Edwin Elias, Daniel M. Hanes, David H. Schoellhamer, John Largier