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Full-Text Articles in Physical Sciences and Mathematics
Ice Nucleation And Overseeding Of Ice In Volcanic Clouds, Adam J. Durant, R. A. Shaw, William I. Rose, Y. Mi, G. G. J. Ernst
Ice Nucleation And Overseeding Of Ice In Volcanic Clouds, Adam J. Durant, R. A. Shaw, William I. Rose, Y. Mi, G. G. J. Ernst
Department of Geological and Mining Engineering and Sciences Publications
Water is the dominant component of volcanic gas emissions, and water phase transformations, including the formation of ice, can be significant in the dynamics of volcanic clouds. The effectiveness of volcanic ash particles as ice-forming nuclei (IN) is poorly understood and the sparse data that exist for volcanic ash IN have been interpreted in the context of meteorological, rather than volcanic clouds. In this study, single-particle freezing experiments were carried out to investigate the effect of ash particle composition and surface area on water drop freezing temperature. Measured freezing temperatures show only weak correlations with ash IN composition and surface …
Erupted Magma Volume Estimates At Santiaguito And Pacaya Volcanoes, Guatemala Using Digital Elevation Models , Kelly S. Durst
Erupted Magma Volume Estimates At Santiaguito And Pacaya Volcanoes, Guatemala Using Digital Elevation Models , Kelly S. Durst
Dissertations, Master's Theses and Master's Reports - Open
High resolution digital elevation models (DEMs) of Santiaguito and Pacaya volcanoes, Guatemala, were used to estimate volume changes and eruption rates between 1954 and 2001. The DEMs were generated from contour maps and aerial photography, which were analyzed in ArcGIS 9.0®. Because both volcanoes were growing substantially over the five decade period, they provide a good data set for exploring effective methodology for estimating volume changes. The analysis shows that the Santiaguito dome complex grew by 0.78 ± 0.07 km3 (0.52 ± 0.05 m3 s-1) over the 1954-2001 period with nearly all the growth occurring on …
Manual Pumping Test Method For Characterizing The Productivity Of Drilled Wells Equipped With Rope Pumps, Essa L. Gross
Manual Pumping Test Method For Characterizing The Productivity Of Drilled Wells Equipped With Rope Pumps, Essa L. Gross
Dissertations, Master's Theses and Master's Reports - Open
Since the introduction of the rope-pump in Nicaragua in the 1990s, the dependence on wells in rural areas has grown steadily. However, little or no attention is paid to rope-pump well performance after installation. Due to financial restraints, groundwater resource monitoring using conventional testing methods is too costly and out of reach of rural municipalities. Nonetheless, there is widespread agreement that without a way to quantify the changes in well performance over time, prioritizing regulatory actions is impossible. A manual pumping test method is presented, which at a fraction of the cost of a conventional pumping test, measures the specific …
Digital Processing And Data Compilation Approach For Using Remotely Sensed Imagery To Identify Geological Lineaments In Hard-Rock Terrains : An Application For Groundwater Explorations In Nicaragua , Jill N. Bruning
Dissertations, Master's Theses and Master's Reports - Open
Sustainable yields from water wells in hard-rock aquifers are achieved when the well bore intersects fracture networks. Fracture networks are often not readily discernable at the surface. Lineament analysis using remotely sensed satellite imagery has been employed to identify surface expressions of fracturing, and a variety of image-analysis techniques have been successfully applied in “ideal” settings. An ideal setting for lineament detection is where the influences of human development, vegetation, and climatic situations are minimal and hydrogeological conditions and geologic structure are known. There is not yet a well-accepted protocol for mapping lineaments nor have different approaches been compared in …