First posted May 17, 2022 For additional information, contact: Director, WMA- Laboratory & Analytical Services DivisionU.S. Geological SurveyUSGS Headquarters12201 Sunrise Valley DriveReston, VA 20192 A cooperative study between the National Park Service (NPS) and U.S. Survey (USGS) characterized groundwater quality hydrogeology in parts of Pinnacles Park. The water-quality investigation assess...

The hydraulic pressure is one of the most important factors in the design of pressure intake tunnels. Since the surrounding media cannot usually resist the high internal pressure of these tunnels, they are usually finished with an adequate lining mostly of reinforced concrete, which is an interaction problem between water, soil or rock and concrete lining. Although reinforcing the concrete lini...

Seasonal frozen loess tunnel stability is controlled by many factors. To study the effects of water content and freeze-thaw cycles of loess tunnel stability, taking loess in Shanxi Yangqu No. 1 tunnel face as the research object, to do different moisture stability studies on loess tunnel after repeated freeze-thaw cycles. The results show that: (1) by the comprehensive structure potential and s...

Population statistics for As concentrations in rocks, sediments and ground water differ by geology and land use features in the New England region, USA. Significant sources of As in the surficial environment include both natural weathering of rocks and anthropogenic sources such as arsenical pesticides that were commonly applied to apple, blueberry and potato crops during the first half of the ...

Alterant tomography h*s been evaluated for its ability to de­ lineate itfsitu water flow paths in a fractured welded-tuff rock mass, The evaluation involved a field experiment in which tomographs of electromagnet attenuation factor (or attenuation rate) at 300 MHz were made before, during, and after the introduc­ tion to the rock of two different water-based tracers: a plain water and dye solut...

Rock/ice avalanches are complex gravitational flows involving three important physicalprocesses: entrainment, phase-changes, and flow transitions. The basic complexity of modelling rock/ice lies in the fact that is a mixture rock, ice, water, snow, soil sediments. interaction these components can lead to transitions which difficult model with simplified rheologies. For example, initially compos...

Knowledge of the ground condition and its hazards can play an important role in the selection of support and suitable excavation method in underground structures. Water transport tunnel is one of the most important structures with regard to the goal of excavation, special conditions and limitations considered in the design and execution of them. Beheshtabad Water Conveyance Tunnel with 64930 me...