Global ETD Search

1	Three-dimensional structural restoration of extensional fault displacements using elastic dislocation theory Clark, Nicholas William January 1998 (has links) No description available. 551
2	Middle Miocene to Holocene History of the Delacroix Island Fault System Levesh, Jarrett Leigh 23 May 2019 (has links) An in-depth field study of the Delacroix Island producing field illustrates the evolution of the east-trending Delacroix Island Fault during the last 13 My. Well log correlations and 3-D seismic interpretation of 22 subsurface bio-stratigraphic horizons across the fault reveal variable stratigraphic thicknesses and displacement. Wells, with well log curve data as shallow as 31 m (100 ft) below the surface, were used to calculate interval thicknesses, expansion indices, sediment accumulation rates, burial history and magnitudes of displacement. Through these analyses, a correlation was found between the positioning of ancient Miocene depocenters over Delacroix Island and a period of increased fault activity. Historic satellite imagery (last 34 yrs) of the field depicts a lineation on the modern marsh surface coincident with the upward projected fault plane. Continuous wetland loss on the downthrown side of the fault trace suggests that recent and continued fault movement may be contributing to marsh submergence. Geology Geomorphology Stratigraphy Tectonics and Structure
3	Ecological Risk Assessment of Heavy Metal Content in the Hatillo River, Costa Rica Pham, Vivian G 01 January 2015 (has links) Rivers all around the world have become increasingly polluted with heavy metals, largely due to industrialization and urbanization. Organisms exposed to high concentrations of heavy metals have shown evidence of biotoxicity and physical deformities. With biomagnification in mind, the possibility that this contamination may soon directly affect humans is a real concern, and policies in manufacturing industries worldwide may have to be reformed. In this study, we measured the concentrations of arsenic (As), cadmium (Cd), chromium (Cr), copper (Cu), nickel (Ni), and lead (Pb) in the Hatillo River and compared these values to those measured in the Tarcoles River, a highly polluted river, and Terciopelo Creek, a relatively clean river. The results showed that the Hatillo River had significantly lower levels of most detected heavy metals than both the Tarcoles and Terciopelo. Overall, sediments in all rivers showed high levels of heavy metal content--especially in chromium, copper, nickel, and lead--which could build up and affect organisms over a long period of time. heavy metal contamination ecology risk assessment Costa Rica rivers sediment loading
4	AN ANALYSIS OF RELATIONSHIPS BETWEEN MODELED HYDROLOGIC/SEDIMENT LOADS AND INDICES OF IN-STREAM PHYSICAL HABITAT QUALITY IN HEADWATER STREAMS OF SOUTHWEST OHIO Lehmann, Adam Clay January 2010 (has links) No description available. Agricultural Engineering Agriculture Aquatic Sciences Environmental Engineering Environmental Management Environmental Science Environmental Studies Freshwater Ecology Geographic Information Science Geomorphology Hydrologic Sciences Hydrology Natural Reso headwater stream physical habitat hydrologic loading sediment loading watershed model AnnAGNPS QHEI HHEI RBS

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