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Full-Text Articles in Physical Sciences and Mathematics
Sediment Metal Concentrations As A Function Of Land Use In The Charles River, Eastern Massachusetts, Darryl L. Luce
Sediment Metal Concentrations As A Function Of Land Use In The Charles River, Eastern Massachusetts, Darryl L. Luce
Graduate Doctoral Dissertations
Two sediment cores and eleven grab samples collected from the Charles River were analyzed to determine changes to the concentration of metals in sediments due to anthropogenic changes in the watershed. The unique aspect of this research was that sediment cores from the same geologic setting, yet having widely different sources, were compared. The findings from that comparison were used to focus the investigation through the remainder of the Charles River. The radionuclides 210Pb, 214Pb, and 137Cs established the year of deposition in the sediment cores. The concentrations of aluminum (Al), iron (Fe), manganese (Mn), copper (Cu), zinc (Zn), chromium …
Essential Spawning Habitat For Atlantic Sturgeon In The James River, Virginia., Geoffrey Austin
Essential Spawning Habitat For Atlantic Sturgeon In The James River, Virginia., Geoffrey Austin
Theses and Dissertations
Substrate composition plays a critical role in determining the spawning success of Atlantic sturgeon. A benthic analysis of the tidal freshwater portion of the James River, Virginia, was performed to locate and protect remaining sturgeon spawning habitat within the James River system. I modeled structural habitat, substrate distribution, and river bathymetry from Richmond, Virginia to the Appomattox River confluence. A classification model was developed to describe the dominant substrate type (mud/silt, sand, gravel, bedrock) using side scan sonar data collected from August 2011-Febuary 2012. River depth, bottom imagery, substrate density (hardness), and ground truth substrate samples were interpolated into a …
Sediment Removal From The San Gabriel Mountains, Mary C. Ferguson
Sediment Removal From The San Gabriel Mountains, Mary C. Ferguson
Pitzer Senior Theses
The issue of sediment removal from the San Gabriel Mountains has been a complex issue that has created problems with beach replenishment, habitat destruction and the need to spend millions of dollars at regular intervals to avoid safety hazards. Most recently 11 acres of riparian habitat, including 179 oaks and 70 sycamores, were removed for sediment placement. Other sites including Hahamongna Watershed Park and La Tuna Canyon also face a similar fate. This thesis questions: How did we get to this point of destroying habitat to dump sediment which is viewed as waste product? What are the barriers for creating …
Geomorphological Approach To Toxic Trace Metal Distribution Across A Medial Bar Deposit In The Trout Brook Of The Park River Watershed, Hartford, Ct, Kelsey Semrod
Senior Theses and Projects
The Trout Brook, a major tributary of the Park River watershed, was sampled for heavy metals in sediment with a focus on Pb, Cu, Cd, and Zn. These metals are known to be contaminating the river due to a history of discharge from metal finishing industries. In a watershed-wide survey conducted in September 2011, high concentrations of metals were found in the Trout Brook, with some sites exceeding the probable effect concentration (PEC). The Trout Brook contains a Sanitary Sewer Overflow (SSO) and a vegetated medial bar that may be trapping sediment. Based on the results of the earlier studies, …
Temporal And Spatial Assessment Of Pahs In Water, Sediment, And Oysters As A Result Of The Deepwater Horizon Oil Spill, Meghan Christina Dailey
Temporal And Spatial Assessment Of Pahs In Water, Sediment, And Oysters As A Result Of The Deepwater Horizon Oil Spill, Meghan Christina Dailey
Electronic Theses and Dissertations
On April 20, 2010, BP's Deepwater Horizon oil rig exploded leaking over 200 million gallons of crude oil into the Gulf of Mexico for 84 days. Exposure to oil-associated polycyclic aromatic hydrocarbons (PAHs) in the water and sediment could severely impact the aquatic organisms inhabiting the Gulf of Mexico (i.e. developmental defects, reproductive effects, death, etc.). Therefore, water, sediment and oyster, Crassostrea virginica, samples were collected approximately bimonthly between May 26 and November 30, 2010 from multiple sites along the Gulf Coast, namely, two sites in Mobile Bay (Denton and Sand Reefs at 1 or 0.1 m above the bay …
Central Arctic Lithostratigraphy: Implication For Sediment Transport And Paleoceanography, Edward Augustus Council Iii
Central Arctic Lithostratigraphy: Implication For Sediment Transport And Paleoceanography, Edward Augustus Council Iii
Browse all Theses and Dissertations
Multiple cores from the Arctic were analyzed by XRF methods to determine the western Arctic lithostratigraphy as expressed in its geochemistry. In general, glacial and interglacial events have distinctly different chemistry. During glacial events, the sediments have elevated Ti, Fe, Rb, and Zr concentrations and depressed Sr and Mn concentrations. The opposite is true of the brown layers, where Ti, Fe, Rb and Zr are lower with higher levels of Mn and Sr. These data indicate that there are 18 chemically unique lithologic units (LUs) that exist among MIS-1 to MIS-16 age sediments. Isopach maps indicate two general depositional patterns …