Mechanics of Beadload Sheets
{'Code': '06030101', 'Directorate': {'Abbreviation': 'GEO', 'LongName': 'Directorate For Geosciences'}, 'Division': {'Abbreviation': 'EAR', 'LongName': 'Division Of Earth Sciences'}}
{'SignBlockName': 'John A. Maccini', 'PO_EMAI': None, 'PO_PHON': None}
Bedload sheets are subtle bedforms, different from other                   previously described bedforms in form, structure, and kinematics,               that appear during transport of mixed-grain-size sediments by                   flowing water.  They are very low relief, transverse accumula-                  tions of grains, coarser toward the front and only a few grain                  diameters thick, that migrate downstream by deposition toward the               front and erosion toward the rear, like ripples and dunes, but at               faster speeds.  The first visible sign of a newly-forming bedload               sheet is the appearance of the zone of coarser grains at its                    front.  The bedload-transport rate varies from essentially zero                 just in front of a bedload sheet to a broad maximum over the                    middle of one.  Moreover, the peak in transport rate is                         significantly closer to the front for the coarser grains than for               the finer, so that the coarser and finer size fractions                         continually leapfrog one another.  Thus, bedload sheets, when                   present, markedly affect the processes of bedload transport and                 sorting .  Their possible presence, therefore, must be taken into               account in future observational and theoretical research on                     bedload transport and also must be considered in the statistical                design of bedload sampling programs.  The proposed research is                  part of a long-term study of the physics of bedload transport.                  It will investigate bedload sheets in Muddy Creek. Wyoming, which               actually is clear, and at a comparative site elsewhere by means                 of both high-speed and time-lapse 16-mm motion-picture                          photography.  It will provide a detailed, quantitative picture of               (a) bedload transport mechanics in the presence of bedload                      sheets, (b) the mechanisms by which bedload sheets form, grow,                  and migrate, (c) the conditions for their growth, stability, and                decay, (d) whether they vary continuously into other bedforms,                  such as dunes or ripples, and, if so, how, and (e) how they                     interact with dunes with which they may be associated.
{'FirstName': 'Ronald', 'LastName': 'Shreve', 'PI_MID_INIT': 'L', 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'Ronald L Shreve', 'EmailAddress': 'shreve@u.washington.edu', 'NSF_ID': '000439178', 'StartDate': '12/15/1988', 'EndDate': None, 'RoleCode': 'Principal Investigator'}
{'Name': 'University of California-Los Angeles', 'CityName': 'LOS ANGELES', 'ZipCode': '900244200', 'PhoneNumber': '3107940102', 'StreetAddress': '10889 WILSHIRE BLVD STE 700', 'StreetAddress2': None, 'CountryName': 'United States', 'StateName': 'California', 'StateCode': 'CA', 'CONGRESSDISTRICT': '36', 'CONGRESS_DISTRICT_ORG': 'CA36', 'ORG_UEI_NUM': 'RN64EPNH8JC6', 'ORG_LGL_BUS_NAME': 'UNIVERSITY OF CALIFORNIA, LOS ANGELES', 'ORG_PRNT_UEI_NUM': None}
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{'Code': '1571', 'Text': 'SCEC'}
{'url': 'https://www.nsf.gov/awardsearch/download?DownloadFileName=1988&All=true', 'xml': '8816508.xml'}