INVESTIGADORES
SZUPIANY Ricardo Nicolas
artículos
Título:
Concentration and suspended load assessments by means of ADCP recording in a large river
Autor/es:
LATOSINSKI, FRANCISCO; SZUPIANY, RICARDO N.; GARCIA, CARLOS M.; GUERRERO, MASSIMO; AMSLER, MARIO L.
Revista:
JOURNAL OF HYDRAULIC ENGINEERING
Editorial:
ASCE-AMER SOC CIVIL ENGINEERS
Referencias:
Lugar: Reston, Virginia; Año: 2014 vol. 140
ISSN:
0733-9429
Resumen:
The standard experimental methods used for
sampling suspended loads in large rivers are usually time consuming, unsafe,
rather expensive, and have a limited spatial resolution. Acoustic Doppler
current profilers (ADCPs), usually applied to measure the flow discharge, may
also be used to assess the suspended sediment concentration by analyzing the
backscattering acoustic strength. Though important efforts have been dedicated
to test this method, results are not as reliable as engineering practices
require, especially in large fluvial systems. In this paper, the correlation
between the corrected backscatter from a 1,200 kHz ADCP and the suspended
concentration from a depthintegrated sampler is presented and discussed.
Despite the assumptions required to utilize this method (i.e., monosized grain
and homogeneous vertical concentration), the results showed acceptable
differences when they were compared with traditional methods. An evaluation of
the backscatter and attenuation of sound produced by fine and coarse material
is presented. Finally, the total suspended load of bed sediment is assessed
using moving-boat ADCP measurements and compared with results from the
corresponding standard method. Differences are at most 46%.