SUSPENDED SEDIMENT PROFILES IN RIVER WITH LISST-SL2 LASER DIFFRACTION INSTRUMENT

Código

PAP110

Autores

Yogi Agrawal, O. Mikkelsen

Tema

MEDIÇÃO, MODELAGEM, TÉCNICAS E TECNOLOGIAS NO CONTEXTO DA HIDROSSEDIMENTOLOGIA

Resumo

Measurements of sediment transport in rivers have for long been done laboriously with water samples drawn infrequently, requiring subseqent time-consuming analysis. A new laser diffraction instrument LISST-SL2 has been developed to make these same measurements in real-time, with sediment concentration, grain size distribution, water velocity, and temperature all stored as a function of depth. This capability permits efficient data collection for monitoring agencies, while at the same time, opening new avenues for scientific research. In this paper, we offer a preview of data collected from two rivers on two continents: the Cowlitz river in Washington, US, and the Yangtze river at Wuhan city, China. We discuss similarities, statistics of the data, vertical structure of river columns, time-scales of sediment fluctuation, and derivable flow quantities.