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Bedform movement recorded by sequential single-beam surveys in tidal rivers

Journal of Hydrology

By:
DOI: 10.1016/S0022-1694(01)00558-3

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Abstract

A portable system for bedform-mapping was evaluated in the delta of the lower Sacramento and San Joaquin Rivers, California, from 1998 to 2000. Bedform profiles were surveyed with a two-person crew using an array of four single-beam transducers on boats about 6 m in length. Methods for processing the bedform profiles into maps with geographic coordinates were developed for spreadsheet programs and surface-contouring software. Straight reaches were surveyed every few days or weeks to determine locations of sand deposition, net transport directions, flow thresholds for bedform regimes, and bedform-transport rates. In one channel of unidirectional flow, the portable system was used to record changes in bedform regime through minor fluctuations of low discharge, and through high discharges near channel capacity. In another channel with reversing flows from tides, the portable system recorded directions of net bedload-transport that would be undetectable by standard bedload sampling alone.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Bedform movement recorded by sequential single-beam surveys in tidal rivers
Series title:
Journal of Hydrology
DOI:
10.1016/S0022-1694(01)00558-3
Volume
258
Issue:
1-4
Year Published:
2002
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
25
Last page:
39
Number of Pages:
15