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Showing 1 to 20 of 61 for “"Alluvium"”.
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A constitutive model for the compression behavior of Old Alluvium
Old Alluvium is classified as a transported, in-situ weathered tropical soil, and represents a class of geomaterials that have a complex microstructure, including cemented aggregates at the meso-scale and groups of clay stacks at the micro-scale. Despite the presence of significant fractions of …
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Compartmentalization in the northern segment of the Brazos River Alluvium aquifer.
Alluvial aquifers such as the Brazos River Alluvium aquifer in central Texas can contain locally significant amounts of groundwater that may be used for irrigation, domestic supply, or to mitigate stress applied to other groundwater and surface water resources. Alluvial aquifers occur within the …
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Laboratory characterization of a highly weathered old alluvium in San Juan, Puerto Rico
The old alluvium underlying much of metropolitan San Juan was formed in early Pleistocene and has undergone substantial post-depositional weathering in the tropical climate of Puerto Rico, resulting in a special combination of soil mineralogy and structure, with very unusual engineering properties. …
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Pre-vegetation alluvium: Geological evidence for river behaviour in the absence of land plants
Pre-vegetation alluvium is unique; at the present day, plants affect multiple aspects of river functioning and deposition and so those rivers that operated before the evolution of land plants largely lack modern sedimentological analogue. However, such rivers were the norm for the first 90% of …
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Fluid Flow and Energy Transport in a High-Level Radioactive Waste Repository in Unsaturated Alluvium
… the Great Basin have thick zones of unsaturated alluvium which might be suitable for disposing of high-level radioactive wastes. This thesis examines the possible effects of a strong heat source on temperature and the movement of water (vapor and liquid) in a repository located in unsaturated …
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Spatial distribution of post-settlement alluvium in the Middle Fork Vermillion River Valley, Illinois, USA
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-08-01
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Hydrostratigraphic units within the alluvium and tertiary volcanics of East Central Yucca Flat, Nevada Test Site
… of porosity or permeability was found in the alluvium which comprises the uppermost hydrostratigraphic unit. Profiles of mean porosity vs lithostratigraphic elevation for 11 lithostratigraphic units are presented. Nuclear test cavities, rubble chimneys and collapse craters collectively …
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Assessing surface and groundwater interactions between the middle Brazos River Alluvium Aquifer and the Brazos River.
The Brazos River Alluvium Aquifer (BRAA) is a vital source of water in Central Texas, primarily used for irrigation. The BRAA and the overlying Brazos River are connected; however, their interaction is not well understood and often overgeneralized. This study seeks to clarify aspects of surface …
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The application of critical state soil mechanics to predict ground deformations below an embankment constructed on soft alluvium
… embankment is underlain by up to eight metres of alluvium and made ground. The embankment was monitored during construction. Centreline settlements of the order of O.6m and horizontal movements at the embankment toe of up to O.1Sm were measured. The excess pore pressures generated during …
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Hydrogeologic analysis of streamflow in relation to underground mining in northern West Virginia
… mouths for discharge, temperature, conductivity, alluvium thickness, and alluvium sediment size. Seven streams are located over undermined longwall panels, with two located over non-undermined areas. Discharge data shows that non-undermined watersheds do not experience stream dewatering, …
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Using PCR Amplification and Genetic Sequence Analysis of 18S rRNA Genes to Survey the Microbial Diversity and Distribution of Eukaryotic Microbes Inhabiting Two Thermo-acidic Streams in Yellowstone National Park, Wyoming
… species in the Nymph Creek mat with those in Alluvium Creek mats (4) evaluate microbial species in algal mats formed on different substrates in Alluvium Creek. The results show that a novel red alga dominates high temperature regions (~50ºC) of Nymph Creek and two "Chlorella-like" algae …
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Morphology and development of the Red Rock Canyon alluvial fan, Clark County, Nevada
… All surfaces identified are formed of limestone alluvium, occur at elevations of 853 m, and share the same climate and vegetation. These surfaces were mapped and delimited by color, texture, dissection, and soil development and were ranked in relative age by elevation and topographic position; …
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Coupled Surface Water-Groundwater Model to Analyze Sustainability of the Atascadero Subbasin
… the interaction between the Salinas River Alluvium Soils and the deeper Paso Robles Formation based on pumping from different shallow and deep wells. Surface water hydrology of the Subbasin was studied using HEC-HMS, and Visual MODFLOW was used to model the aquifer. Both HEC-HMS and Visual …
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Neotectonics and Paleoseismology of the North Frontal Thrust System, southern California
… is dissected and replaced by younger alluvium with a 1.5-m-high scarp. An excavation across the smaller scarp revealed a 3-m-thick sequence of coarse alluvium cut by a shallow, south-dipping thrust fault with 1.65 m of throw. The simple, smooth trace of the fault plane and the lack of …
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Water conservation methods to conserve the High Plains aquifer and Arikaree River Basin: a case study on the Arikaree River
… on the High Plains aquifer (HPA). The river alluvium is habitat for threatened fish species such as the Hybognathus hankinsoni (Brassy Minnow) and habitat for many terrestrial invertebrates. In addition to the demands for maintenance of habitats, the surrounding almost exclusively irrigated …
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Quarternary Alluvial Deposition in the Upper Green River Valley, Kentucky
… surfaces at PCC study site: a Lower Holocene alluvium (LHA), an Early Holocene alluvium (EHA), and a Dissected Quaternary terraces (DQT). Equivalent LHA, EHA, and DQT units were recognized downstream at the UGRBP study site. During the Pleistocene and Early Holocene epochs the Upper Green …
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MULTIDISCIPLINARY WORK TO DETERMINE HYDROLOGY OF ARID LAND SPRINGS AND HOW SPRING WATERS INFLUENCE WATER QUALITY AND ECOSYSTEM HEALTH FOR DESERT ENVIRONMENTS
… ZBS habitats include spring waters and shallow alluvium waters from stream channels upstream from spring discharge. This research used hydrogeochemical methods to determine flow paths, mixing scenarios, residence time and recharge mechanism for ground, surface and spring waters for the ZBS …
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Tectogenesis and metamorphism of the Piedmont from Columbia to Westview, Virginia along the James River
… dikes. An erosional unconformity separates alluvium and colluvium from the layered and intrusive rocks.
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Determination of coefficient of storage by use of gravity measurements.
… unconfined basin-fill deposits and flood-plain alluvium aquifers. The basin-fill aquifer overlies less permeable Rillito beds and is overlain by the flood-plain alluvium. The two upper aquifers are flat-bedded heterogeneous deposits of sand and gravel. The water table through these aquifers …
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Geology of Killam deep test near Valentine, Jeff Davis County, Trans-Pecos, Texas
… from the nearby hills; more than 500 feet of alluvium was penetrated by the Killam well. Examination of well cuttings and thin sections of cuttings indicates eighteen volcanic units tentatively correlated with other volcanic rocks of the region.
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