Amendment 0002_h - 00 90 04 WENTWORTH SCALE.pdf
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- Solicitation number
- W912DS24B0003
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This document is a section from a Request for Proposal (RFP) for a maintenance dredging and beach nourishment project at Fire Island Inlet and Shores Westerly to Jones Inlet, New York. The project involves dredging approximately 700,000 to 1,000,000 CY of sand from the Fire Island Inlet Federal Navigation channel and depositing the sand as nourishment along the designated Gilgo Beach. The purpose is to maintain the project dimensions and provide safe navigation for commercial and recreational boating. The dredging work must be completed within 97 calendar days after the Notice to Proceed, with a required minimum production rate of 13,500 CY per day. The estimated project cost range is $15,000,000 to $50,000,000. Plans and specifications will be available in March 2024, with bid opening in April 2024 and contract award in May 2024. This is an unrestricted procurement by the U.S. Army Corps of Engineers, New York District.
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Fire Island Inlet and Shores Westerly to Jones Inlet, NY- Navigation
SECTION 00 90 04
WENTWORTH SCALE
06/17
PART 1 GENERAL
1.1 DESCRIPTION
Wentworth scale
PART 2 PRODUCTS
Not Used
PART 3 EXECUTION
Not Used
-- End of Section --
DOCUMENT 00 90 04 Page 1
00 90 0 -1
COMPOSITE GRAIN SIZE DISTRIBUTION CURVES FOR SAND SEDIMENTS AND
GRAIN SIZE SCALES FOR SEDIMENT
The grade scale most commonly used for sediments is the Wentworth (1922) scale which is a logarithmic scale in that each grade limit is twice as large as the next smaller grade limit. The scale starting at 1mm and changing by a fixed ratio of 2 was introduced by J.A. Udden (1898), who also named the sand grades we use today.
However, Udden drew the gravel/sand border at 1 mm and used different terms in the gravel and mud division. For more detailed work, sieves have bee constructed at intervals 2 ^(1/2) and 2^(1/14). The (phi) scale, devised by Krumbein, is a much more convenient way of presenting data than if the values are expressed in millimeters, and is used almost entirely in recent work.
WENTWORTH SCALE
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