Chapter 6 Desk study, remote sensing, geographical information systems and field evaluation
Published:January 01, 2012
D. T. Shilston, R. M. Teeuw, G. West, Engineering Group Working Party, 2012. "Chapter 6 Desk study, remote sensing, geographical information systems and field evaluation", Hot Deserts: Engineering, Geology and Geomorphology Engineering Group Working Party Report, M. J. Walker
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In science and engineering, including engineering geology and geotechnical engineering, initial investigations can be particularly cost-effective for early evaluation and the planning of subsequent investigations: ‘time spent in reconnaissance is seldom wasted’ (purportedly said by Napoleon Bonaparte). But the work needs to be well planned and executed if its findings are to be used properly and their potential benefits are to be realized. Clients and their professional advisors are frequently exhorted to carry out desk studies and other investigations early in the design of a project (e.g. among many publications: Association of Geotechnical and Geoenvironmental Specialists 2006; BS EN 1997-2). Unfortunately, such advice is sometimes ignored.
This chapter contains advice on desk studies and field evaluation for projects in hot deserts. Much of the advice also applies to other geographical and geological environments. However, some is specific to hot deserts, and it is this advice that is emphasized.
Hot deserts are defined by their climate. In addition to their aridity, high temperature and large daily range in temperature, four other attributes make deserts distinctively challenging for engineering projects.
Wind – the effects of wind on the bare desert surface; the movement of sand and dust.
Groundwater – the general absence of groundwater at shallow depths.
Surface water – the erosive and inundating effects of storms: flash flooding in wadis and sheet flooding on the desert surface.
Chemistry – desert temperatures and aridity result in the development of minerals and materials that are not present (or are much less familiar) in other climatic zones.
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Hot Deserts: Engineering, Geology and Geomorphology Engineering Group Working Party Report
This volume provides an authoritative and comprehensive state-of-the-art review of hot desert terrains in all parts of the world, their geomaterials and influence on civil engineering site investigation, design and construction. It primarily covers conditions and materials in modern hot deserts, but there is also coverage of unmodified ancient desert soils that exhibit engineering behaviour similar to modern desert materials. Thorough and up-to-date guidance on modern field evaluation and ground investigation techniques in hot arid areas is provided, including reference to a new approach to the desert model and detailed specialized assessments of the latest methods for materials characterization and testing.
The volume is based on world-wide experience in hot desert terrain and draws upon the knowledge and expertise of the members of a Geological Society Engineering Group Working Party comprising practising geologists, geomorphologists and civil engineers with a wealth of varied, but complementary experience of working in hot deserts.
This is an essential reference book for professionals, as well as a valuable textbook for students. It is written in a style that is accessible to the non-specialist. A comprehensive glossary is also included.