Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Engineering (4)
- Civil and Environmental Engineering (3)
- Construction Engineering and Management (2)
- Earth Sciences (2)
- Geology (2)
-
- Physical Sciences and Mathematics (2)
- Architectural Technology (1)
- Architecture (1)
- Civil Engineering (1)
- Construction Engineering (1)
- Environmental Engineering (1)
- Environmental Sciences (1)
- Geophysics and Seismology (1)
- Geotechnical Engineering (1)
- Hydraulic Engineering (1)
- Mechanical Engineering (1)
- Other Mechanical Engineering (1)
- Soil Science (1)
- Water Resource Management (1)
Articles 1 - 7 of 7
Full-Text Articles in Entire DC Network
Tholos - Eva Sample Location Calibration Device, James Verheyden, Kat Gipson, Julia Rios, Ben Trust
Tholos - Eva Sample Location Calibration Device, James Verheyden, Kat Gipson, Julia Rios, Ben Trust
Mechanical Engineering
To support NASA’s upcoming Artemis missions, an extravehicular activity (EVA) photometric calibration scale was developed to replace the Apollo-era Gnomon device. The Gnomon was a gimbaled stadia rod mounted on a tripod which provided color and reflectivity photo calibration, vertical orientation, and solar shadow direction, to include in photos of lunar geologic samples and features. With over 50 years of innovation since the first Gnomon deployment on Apollo 11, this redesign of the photometric calibration scale will support NASA’s missions in the modern day. The Tholos™, named after the ancient Greek repository of standardized measures, consists of a quadrupedal design …
Investigation Of Pervasive Clay Layers And Their Effect On Groundwater Flow Using Electrical Resistivity Tomography In The San Antonio Groundwater Basin, James M. Carlson
Investigation Of Pervasive Clay Layers And Their Effect On Groundwater Flow Using Electrical Resistivity Tomography In The San Antonio Groundwater Basin, James M. Carlson
Natural Resources Management and Environmental Sciences
The United States Geological Survey is developing an integrated hydrologic model of the San Antonio Creek Groundwater Basin to better understand and simulate the integrated surface water and groundwater system. An abrupt 60 meter offset in groundwater depth over a distance of less than one kilometer is observed in well readings within the Cañada De Las Flores region of the groundwater basin. Abrupt changes in groundwater levels are often explained by the presence of a fault in the subsurface vertically offsetting sedimentary units. However, observations of the structural geology of this region indicates that faulting is unlikely and suggests an …
Unexpected Setbacks When Excavating - Using Gpr For Mitigating Risk: A Case Study, Sam Marcum
Unexpected Setbacks When Excavating - Using Gpr For Mitigating Risk: A Case Study, Sam Marcum
Construction Management
Whether constructing on undeveloped land or on an existing developed site, there is a risk of encountering unexpected objects when excavating. With today’s technology in Ground Penetrating Radar (GPR), this risk can generally be mitigated. Using Whiting-Turner’s construction of Stanford University’s new ChEM-H & SNI Building as an example, this case study discusses the use of GPR for underground mapping, as well as various ways to implement GPR technology. The ChEM-H & SNI site had many underground utilities that required precise pot-holing to verify locations. Although pot-holing is widely used, it is a destructive method, it is time and labor …
Unexpected Setbacks When Excavating – Using Gpr For Mitigating Risk: A Case Study, Samuel L. Marcum
Unexpected Setbacks When Excavating – Using Gpr For Mitigating Risk: A Case Study, Samuel L. Marcum
Construction Management
Whether constructing on undeveloped land or on an existing developed site, there is a risk of encountering unexpected objects when excavating. With today’s technology in Ground Penetrating Radar (GPR), this risk can generally be mitigated. Using Whiting-Turner’s construction of Stanford University’s new ChEM-H & SNI Building as an example, this case study discusses the use of GPR for underground mapping, as well as various ways to implement GPR technology. The ChEM-H & SNI site had many underground utilities that required precise pot-holing to verify locations. Although pot-holing is widely used, it is a destructive method, it is time and labor …
Ncma Groundwater Model Using Usgs Modflow-2005/Pest, Brian Matthew Wallace
Ncma Groundwater Model Using Usgs Modflow-2005/Pest, Brian Matthew Wallace
Master's Theses
A numerical model for the NCMA aquifer complex is presented. The objective of the study is to develop a numerical groundwater model for the NCMA aquifer system to enhance the understanding of subsurface groundwater flow. Infiltration, streamflow, pumping, and return flows are implemented to characterize the aquifer complex over time. The numerical model is calibrated to municipal and monitoring well data, average monthly water balances, and hydraulic contours. Transient aquifer inflows and outflows are assessed in the results of the study and are compared to balance terms from previous studies. The 2007 Todd Engineers Study subsurface inflows and outflows generate …
Geoelectrical Detection Of Water Table Depth At Two Locations In The Los Osos Groundwater Basin, Hallie A. Douglas
Geoelectrical Detection Of Water Table Depth At Two Locations In The Los Osos Groundwater Basin, Hallie A. Douglas
Natural Resources Management and Environmental Sciences
The city of Los Osos sits on top of a coastal groundwater aquifer which is the sole supplier of all its residential, agricultural, and industrial water needs. Lacking a sewer system, the upper aquifer became progressively contaminated with nitrates over several decades. Groundwater pumping eventually shifted to the lower aquifer, however seawater intrusion of the lower aquifer caused by over-pumping has further degraded water quality. The Los Osos groundwater basin provides an excellent field region to examine the utility of geophysical methods for characterizing aquifer structure. In this study shallow (<20 >m) electrical resistivity imaging methods were performed at two …
Determining Slip Sense Along The Sur-Nacimiento Fault Through The Use Of Detrital Zircon Geochronology On The Nacimiento Block At Cerro Alto, California, Karen Decker
Natural Resources Management and Environmental Sciences
No abstract provided.