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Articles 3091 - 3120 of 5201
Full-Text Articles in Geology
Mgrre_Thinsections_05_A_21, Mgrre
The Effects Of Estradiol-17Β On The Sex Reversal, Survival, And Growth Of Green Sunfish Lepomis Cyanellus, Chad N. Teal, Daniel J. Schill, Susan B. Fogelson, Colby M. Roberts, Kevin Fitzsimmons, Javan M. Bauder, William T. Stewart, Scott A. Bonar
The Effects Of Estradiol-17Β On The Sex Reversal, Survival, And Growth Of Green Sunfish Lepomis Cyanellus, Chad N. Teal, Daniel J. Schill, Susan B. Fogelson, Colby M. Roberts, Kevin Fitzsimmons, Javan M. Bauder, William T. Stewart, Scott A. Bonar
United States Geological Survey: Staff Publications
The feminization of green sunfish Lepomis cyanellus could expand their utility as a game fish or aquacultured species by preventing overcrowding and precocious reproduction in stocked systems. Feminization of green sunfish could also help elucidate information on their sex determination system. We report the feminization of green sunfish cohorts via oral administration of estradiol-17β (E2) during early development. A low-dose (100 E2 mg per kg of diet) and a high-dose (150 E2 mg per kg of diet) experimental E2 treatment were fed to juvenile green sunfish from 30 to 90 days post-hatch. Fish were subsequently evaluated for any treatment effect …
Mgrre_Thinsections_05_A_20, Mgrre
Mgrre_Thinsections_05_A_19, Mgrre
Landslide Susceptibility Map Of Johnson County, Kentucky, Matt M. Crawford, Hudson J. Koch, Jason M. Dortch, William C. Haneberg
Landslide Susceptibility Map Of Johnson County, Kentucky, Matt M. Crawford, Hudson J. Koch, Jason M. Dortch, William C. Haneberg
Contract Reports--KGS
The purpose of this map is to identify landslide-prone areas in Johnson County in order to provide the public, as well as local and state government agencies, with information about where landslides are likely to occur. This map represents geomorphic-based susceptibility modeling that focuses on physical slope characteristics and morphology, the quality of which is dependent on data accuracy and resolution of terrain models. The availability of high-resolution (5-ft digital elevation model) lidar derived datasets allows for the generation of terrain elevation derivatives such as hillshades, slope, aspect, curvature, and roughness, as well as identification of existing landslide deposits. These …
Landslide Susceptibility Map Of Floyd County, Kentucky, Matt M. Crawford, Hudson J. Koch, Jason M. Dortch, William C. Haneberg
Landslide Susceptibility Map Of Floyd County, Kentucky, Matt M. Crawford, Hudson J. Koch, Jason M. Dortch, William C. Haneberg
Contract Reports--KGS
The purpose of this map is to identify landslide-prone areas in Floyd County in order to provide the public, as well as local and state government agencies, with information about where landslides are likely to occur. This map represents geomorphic-based susceptibility modeling that focuses on physical slope characteristics and morphology, the quality of which is dependent on data accuracy and resolution of terrain models. The availability of high-resolution (5-ft digital elevation model) lidar derived datasets allows for the generation of terrain elevation derivatives such as hillshades, slope, aspect, curvature, and roughness, as well as identification of existing landslide deposits. These …
Landslide Susceptibility Map Of Magoffin County, Kentucky, Matt M. Crawford, Hudson J. Koch, Jason M. Dortch, William C. Haneberg, Ashton A. Killen
Landslide Susceptibility Map Of Magoffin County, Kentucky, Matt M. Crawford, Hudson J. Koch, Jason M. Dortch, William C. Haneberg, Ashton A. Killen
Contract Reports--KGS
The purpose of this map is to identify landslide-prone areas in Magoffin County, Kentucky, in order to provide the public, as well as local and state government agencies, with information about where landslides are likely to occur. This map represents geomorphic-based susceptibility modeling that focuses on physical slope characteristics and morphology, the quality of which is dependent on data accuracy and resolution of terrain models. The availability of high-resolution (5-ft digital elevation model) lidar derived datasets allows for the generation of terrain elevation derivatives such as hillshades, slope, aspect, curvature, and roughness, as well as identification of existing landslide deposits. …
Landslide Susceptibility Map Of Pike County, Kentucky, Matt M. Crawford, Hudson J. Koch, Jason M. Dortch, William C. Haneberg
Landslide Susceptibility Map Of Pike County, Kentucky, Matt M. Crawford, Hudson J. Koch, Jason M. Dortch, William C. Haneberg
Contract Reports--KGS
The purpose of this map is to identify landslide-prone areas in Pike County in order to provide the public, as well as local and state government agencies, with information about where landslides are likely to occur. This map represents geomorphic-based susceptibility modeling that focuses on physical slope characteristics and morphology, the quality of which is dependent on data accuracy and resolution of terrain models. The availability of high-resolution (5-ft digital elevation model) lidar derived datasets allows for the generation of terrain elevation derivatives such as hillshades, slope, aspect, curvature, and roughness, as well as identification of existing landslide deposits. These …
Climate Change Alters Aging Patterns Of Reservoir Aquatic Habitats, Leandro E. Miranda, Nicky M. Faucheux
Climate Change Alters Aging Patterns Of Reservoir Aquatic Habitats, Leandro E. Miranda, Nicky M. Faucheux
United States Geological Survey: Staff Publications
Two slow-moving developments are threatening reservoir aquatic habitats globally: aging and climate change. These events are projected to transform reservoir aquatic habitats in various and often unpredictable ways. Aging affects in-lake habitats directly, whereas climate change affects both in-lake and off-lake conditions. Climate change is expected to accelerate and, in some instances, possibly decelerate aging. Aging can be indexed as functional age, an index that signals the position of a reservoir along its lifespan relying on inlake descriptors of aquatic habitat. Using existing habitat datasets and climate projections, we developed semi-quantitative predictions about the effect of climate change on reservoir …
Mgrre_Thinsections_05_A_18, Mgrre
Mgrre_Thinsections_05_A_17, Mgrre
Mgrre_Thinsections_05_A_16, Mgrre
Sediment Source Fingerprinting As An Aid To Large-Scale Landscape Conservation And Restoration: A Review For The Mississippi River Basin, Zhen Xu, Patrick Belmont, Janice Brahney, Allen C. Gellis
Sediment Source Fingerprinting As An Aid To Large-Scale Landscape Conservation And Restoration: A Review For The Mississippi River Basin, Zhen Xu, Patrick Belmont, Janice Brahney, Allen C. Gellis
United States Geological Survey: Staff Publications
Reliable quantitative information on sediment sources to rivers is critical to mitigate contamination and target conservation and restoration actions. However, for large-scale river basins, determination of the relative importance of sediment sources is complicated by spatiotemporal variability in erosional processes and sediment sources, heterogeneity in sediment transport and deposition, and a paucity of sediment monitoring data. Sediment source fingerprinting is an increasingly adopted field-based technique that identifies the nature and relative source contribution of sediment transported in waterways. Notably, sediment source fingerprinting provides information that is independent of other field, modeling, or remotely sensed techniques. However, the diversity in sampling, …
Mgrre_Thinsections_05_A_15, Mgrre
Mgrre_Thinsections_05_A_14, Mgrre
Mgrre_Thinsections_05_A_13, Mgrre
Mgrre_Thinsections_05_A_12, Mgrre
Mgrre_Thinsections_05_A_11, Mgrre
Mgrre_Thinsections_05_A_10, Mgrre
Mgrre_Thinsections_05_A_9, Mgrre
Mgrre_Thinsections_05_A_8, Mgrre
Mgrre_Thinsections_05_A_7, Mgrre
Landslide Susceptibility Map Of Martin County, Kentucky, Matt M. Crawford, Hudson J. Koch, Jason M. Dortch, William C. Haneberg
Landslide Susceptibility Map Of Martin County, Kentucky, Matt M. Crawford, Hudson J. Koch, Jason M. Dortch, William C. Haneberg
Contract Reports--KGS
The purpose of this map is to identify landslide-prone areas in Martin County in order to provide the public, as well as local and state government agencies, with information about where landslides are likely to occur. This map represents geomorphic-based susceptibility modeling that focuses on physical slope characteristics and morphology, the quality of which is dependent on data accuracy and resolution of terrain models. The availability of high-resolution (5-ft digital elevation model) lidar derived datasets allows for the generation of terrain elevation derivatives such as hillshades, slope, aspect, curvature, and roughness, as well as identification of existing landslide deposits. These …
Revisiting 228Th As A Tool For Determining Sedimentation And Mass Accumulation Rates, Joseph J. Tamborski, Pinghe Cai, Meagan Eagle, Paul Henderson, Matthew A. Charette
Revisiting 228Th As A Tool For Determining Sedimentation And Mass Accumulation Rates, Joseph J. Tamborski, Pinghe Cai, Meagan Eagle, Paul Henderson, Matthew A. Charette
OES Faculty Publications
The use of 228Th has seen limited application for determining sedimentation and mass accumulation rates in coastal and marine environments. Recent analytical advances have enabled rapid, precise measurements of particle-bound 228Th using a radium delayed coincidence counting system (RaDeCC). Herein we review the 228Th cycle in the marine environment and revisit the historical use of 228Th as a tracer for determining sediment vertical accretion and mass accumulation rates in light of new measurement techniques. Case studies comparing accumulation rates from 228Th and 210Pb are presented for a micro-tidal salt marsh and a marginal sea …
A Demonstration Of A Simple Methodology Of Flood Prediction For A Coastal City Under Threat Of Sea Level Rise: The Case Of Norfolk, Va, Usa, Tal Ezer
CCPO Publications
Many coastal cities around the world are at risk of increased flooding due to sea level rise (SLR), so here a simple flood prediction method is demonstrated for one city at risk, Norfolk, VA, on the U.S. East Coast. The probability of future flooding is estimated by extending observed hourly water level for 1927–2021 into hourly estimates until 2100. Unlike most other flood prediction methods, the approach here does not use any predetermined probability distribution function of extreme events, and instead a random sampling of past data represents tides and storm surges. The probability of flooding for 3 different flood …
Mgrre_Thinsections_05_A_6, Mgrre
Mgrre_Thinsections_05_A_5, Mgrre
Mgrre_Thinsections_05_A_4, Mgrre
Mgrre_Thinsections_05_A_3, Mgrre
Mgrre_Thinsections_05_A_2, Mgrre