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Fishways at Natural Obstructions
Published in Charles H. Clay, P. Eng, Design of Fishways and Other Fish Facilities, 2017
In finally locating the centerline of the fishway, the structure with the required number of baffles can be tried in any desired number of locations, with the downstream end fixed at the point where fish must enter. The location involving the least amount of rock excavation will often be easily determined, but it may not always be the best in other ways. For instance, it may be desirable to move the centerline or even the entrance a few feet in order to make the proposed fishway walls line up with existing fissures or planes of weakness in the rock. This will help to prevent overbreak and make the rock excavation easier. A geologist can be very helpful in this respect as he or she is often able to predict subsurface conditions, such as cracks, from surface observations, and the engineer can be guided accordingly. In addition, it may be found more economical in some cases to place the fishway in a tunnel excavated in the bank rather than in a deep open cut. If this appears to be the case, the geologist can assess the stability of the tunnel roof and indicate the degree of care needed in blasting. The same considerations apply to the siting of a Denil fishway.
Geotechnical conditions and seismic hazard analysis for architecture heritage preservation in Peru: The Andahuaylillas Church case study
Published in Koen Van Balen, Els Verstrynge, Structural Analysis of Historical Constructions: Anamnesis, Diagnosis, Therapy, Controls, 2016
M.A. Pando, R. Aguilar, S. Lopez, G. Zavala
geotechnical, topographic, and geologic conditions, assessment of soil and rock properties through laboratory and in-situ tests, etc. The Deterministic SHA presented herein include the following main components: - Assessment of geology. - Assessment of the seismicity and identification of main sources of seismicity. - Assessment of geotechnical conditions including MASW geophysical tests to help obtain profiles of shear wave velocity. - Ambient vibration monitoring for predominant site period determination. To assess local site conditions the test program at this site included eight MASW test lines, and four ambient vibration monitoring tests. The location of the different tests are shown in Figure 5. This figure also shows the location of 5 test pits carried out by Fernandez-Baca, 2008. 2.1 MASW geophysical tests
Natural Gas
Published in Anco S. Blazev, Energy Security for The 21st Century, 2021
By surveying and mapping the surface and sub-surface characteristics of an area, the geologist can extrapolate which areas are most likely to contain a petroleum or natural gas reservoir. The geologist uses techniques that range from outcroppings of rocks (on flatland, or in valleys, and gorges) to geologic information obtained from rock cuttings and samples from the digging of irrigation ditches, water wells, and other oil and gas wells.
Digitisation, sustainability, and disruption – promoting a more balanced debate on risk in the geotechnical community
Published in Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards, 2020
Sukumar Pathmanandavel, Charles John MacRobert
In considering structures built on, within or of the ground, geotechnical engineers deal with uncertainties related to understanding geomaterials (soils, rocks) and geologic processes to provide solutions with a quantitative prediction of performance. While much work is still required to develop this technical understanding, this paper attempts to steer the geotechnical community to consider and debate some of the “big and messy” problems in the world.