NASA/American Society for Engineering Education (ASEE) Summer Faculty Fellowship Program 1989

Since 1964, NASA has supported a program of summer faculty fellowships for engineering and science educators. The objectives are: to further the professional knowledge of qualified engineering and science faculty; to stimulate and exchange ideas between participants and NASA; to enrich and refresh the research and teachning activities of participants' institutions; and to contribute to the research objectives of the NASA center. College or university faculty members will be appointed as Research Fellows to spend 10 weeks in cooperative research and study at the NASA Langley Research Center. The Fellow will devote approximately 90 percent of the time to a research problem and the remaining time to a study program. The study program will consist of lecture and seminars on topics of interest or that are directly relevant to the Fellows' research topic

Multi-Scale detection, mapping, and modelling geomorphic change in gravel-bed rivers with UAV remote sensing

Fluvial science is in particular need of surveying tools which can rapidly and accurately capture topographic data. The use of low-cost, consumer grade UAV (unmanned aerial vehicle) systems and Structure from Motion (SfM) processing methods has seen successful adoption by many other earth surface processes sub-fields however their use for monitoring within the field of fluvial geomorphology remains limited. This study tests the applicability of UAV photogrammetry to fluvial surveying, capturing centimetric resolution data across kilometric scales, providing an ideal perspective for geomorphic process interpretation. For a historically modified UK case study, four series of very high resolution DEMs (digital elevation model) and orthomosaic imagery are produced for a 2km reach of quasi-wandering gravel-bed river. Comparative analyses of DEMs between 2016 and 2018 reveals widening of the incised margin and significant geomorphic evolution characteristic of re-naturalization following the termination of gravel mining, channelization, and resultant aggressive incision. Whole reach volumetric analysis reveals a negative sediment budget approximating a net loss of 250m3/year. Budgetary segregation shows 22% of eroded material is sourced from the banks of the inset wandering margin and is a possible cause of a general fining (30% reduction in mean b axis) of bed material within active channels, detectable by grain scale analysis of high-resolution orthomosaic imagery. Vertical scour is seen to be prevented, even under extreme flows (~100 m3/s-1), by a bed armouring effect which is sustained by liberation of coarse clasts from the floodplain via lateral erosion and bank collapse. Woody debris dynamics, gravel bar creation and migration are intricately modelled throughout the site, their presence seen to be affecting flow-prioritization of sub-channels inside the incised margin. UAV surveying workflows and processing protocols are also developed for fluvial science: A means to neutralize and filter out surface error caused by vegetation occlusion in the SfM workflow, and a method to correct for geo-referencing error in large DEMs. Geomorphic findings at this UK case study hold valuable and transferable insights to river re-naturalization in the context of gravel extraction and channelization

The mystic way in postmodernity : transcending theological boundaries in the writings of Iris Murdoch, Denise Levertov and Annie Dillard

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