Accession Number:

ADA025771

Title:

General Scour and Fill Along a Stream Reach.

Descriptive Note:

Final rept. 1 Jun 74-31 May 76,

Corporate Author:

CALIFORNIA INST OF TECH PASADENA

Personal Author(s):

Report Date:

1976-06-07

Pagination or Media Count:

15.0

Abstract:

A series of field and laboratory experiments has shown that bed reworking by moderate floods in uniform reaches of steep, sand-bed ephemeral streams is predominantly by bedform development and migration, and not by general scour and fill. In two floods in the field experiment, maximum scour was 24 cm in the first and 66 cm in the second. Bedform amplitudes, estimated using well-established theoretical techniques and measurements of channel parameters, were 28 to 64 cm and 48 to 97 cm, respectively. In the laboratory experiment, maximum general scour and fill, calculated from the difference between measured sediment input and output rates in the flume, was about that of two sand grain diameters, and less than 3 percent of the amplitude of bedforms in the channel. Similar calculations show that scour and fill data reported in the literature are also compatible with bed reworking by bedforms.

Subject Categories:

  • Geology, Geochemistry and Mineralogy
  • Hydrology, Limnology and Potamology
  • Civil Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE