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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Special sessions : Monitoring flow rate and salinity intrusion in a tidal floodway using fluvial acoustic tomography
Monitoring flow rate and salinity intrusion in a tidal floodway using fluvial acoustic tomography
Author : KIYOSI KAWANISI (1), MAHDI RAZAZ (2) & MASOUD BAHRAINI MOTLAGH (3)
ABSTRACT
Six-year record of tidal current and sound speed has been collected in a tidal diversion channel using Fluvial Acoustic
Tomography System (FATS) with a couple of 30 kHz broad-band transducers. The FATS was located around 9 km
upstream far from the mouth of Ota River diversion channel, Japan. The reciprocal sound transmission that was performed
between the two acoustic stations, located on both sides of the channel, enabled us to measure range-averaged sound
speed and water velocity along an oblique transmission line. The channel is a shallow tidal-forced river with a maximum
tidal range of 4 m at the mouth. The freshwater runoff into the channel is regulated by the array of sluice gates, located
270 m upstream of the observation site. The saline water was flushed out by the gate operation for flood events. Thus, the
flow and the salinity intrusion presented strong unsteady nature. The salinity intrusion was investigated from the mean
sound speed measured by FATS. The recovering time of the salinity ranged from 9.5 days to 27 days after the gates got
back. The tidal velocity amplitude and the outflow velocity associated the river discharge basically controlled the recovery
of salinity intrusion.
File Size : 1,835,219 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Special sessions
Date Published : 19/08/2015
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