INALI   02622
INSTITUTO NACIONAL DE LIMNOLOGIA
Unidad Ejecutora - UE
artículos
Título:
Estimation of Concentration and Load of Suspended Bed Sediment in a Large River by Means of Acoustic Doppler Technology
Autor/es:
LATOSINSKI, FRANCISCO; SZUPIANY, RICARDO NICOLÁS; GARCÍA, CARLOS MARCELO; GUERRERO, MASSIMO; AMSLER, MARIO LUIS
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%.