Author(s): Diana Diaz; Sergio Byron Morera; Jhon Dany Orrillo
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Abstract: Bedload transport measurements are important for disaster prevention (e. g. floods). Isolated and continuous middle, high and extreme peak discharges transport different particle sizes and amount of sediment. Direct and indirect monitoring methods had been developed, and new technologies are in outcome increase, however, the calibration also seems to be a challenge. Hence, understanding bedload transport in steep mountain river is still an open question. In our paper we develop a new methodology based on a stratified sediment trap, and using a common type of hydraulic weir infrastructure to monitor bedload on the upper mountain watershed. The Ronquillo diversion weir was used, with a storage capacity of 68±2m. Each time the weir is filled with sediment, cleaning is carried out by opening the two lateral cleaning gates. The proposed stratified sampling method is pertinent. However, the uncertainty of this method focuses on the turbulence and sediment resuspension during peaks discharge and the particles that will be deposited in the stratified trap. Finally, empirical formulas overestimate bedload transport during low and middle discharge, while those formulas strongly underestimate the bedload during high and extreme peaks discharge.
Year: 2018