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Pacific Southwest Research Station
800 Buchanan Street
Albany, CA 94710-0011
Research Topics Water & Watersheds
Fine sediment in pools
V* is a measure of the supply of excess fine sediment (sand and fine gravel) in gravel bed channels. The method was developed in 1990 as part of our work on the effects of sediment on channel form.
Measuring the fraction of pool volume filled with fine sediment describes applications and limitations of the technique and how to measure V* in a pool and in a reach. Fine bed material in pools of natural gravel bed channels covers much of what we've learned about fine bed material and V* in the past nine years. You can also search our publications for other references on V*.
We have available here 'Lotus 123 v5' or 'Microsoft Excel' spreadsheets to calculate individual pool and reach mean water volume, fine sediment volume, and V*, and reach mean V* variance; instructions on using the spreadsheets; an example file; and notes on some potentially confusing pool measurement situations.
For calculating V* from pool measurement data. Download by clicking the link and using your browser to save to a file.
Instructions for Fip.wk1 and Varv.wk1, which also work for Fip.xls and Varv.xls
The instructions for vstar.WK4 are in the workbook, on the instructions sheet.
llm1999.wk1 is an example data file for a pool. To use it, copy all the cells with data in them starting at cell B1 (for the example sheet, that's B1-P30) and paste into Fip.xxx starting at cell B1 or into vstar.WK4 starting at cell B4.
Notes describes some potentially confusing pool measurement situations and how we deal with them.
|Last Modified: May 15, 2015 03:29:58 PM|