Abstract
The monitoring of fluvial suspended sediment transport plays an important role in the assessment of morphological processes, river habitats, or many social activities associated with river management. However, establishing and operating a well-functioning sediment monitoring system requires the involvement of advanced indirect methods. This study investigates the advantages and limitations of optical and acoustic devices, to quantify the uncertainties and provide a comprehensive comparative assessment of the investigated indirect methods. The novelty of this study, compared to previous ones, is that four different indirect techniques are parallel tested, i.e., the laser diffraction based LISST-Portable|XR, an infrared based optical instrument, the VELP TB1 turbidimeter, the acoustic based LISST-ABS (Acoustical Backscatter Sensor) sensor, and a 1200 kHz Teledyne RD Instruments Acoustic Doppler Current Profiler (ADCP). The calibration of all the indirect methods was performed based on more than 1000 samples taken from the Hungarian section of the Danube River within a wide suspended sediment concentration range. Implementing a comparative assessment of the different sediment analysis methods, a qualitative and quantitative characterisation of the applicability is provided. Furthermore, a proposal for an optimised sediment monitoring methodology is also suggested.
Highlights
Quantitative characteristics of the fluvial sediment transport play an important role in the natural morphological processes of the riverbed, in the quality of river habitats, and in many human activities associated with river management [1]
Turbidimeter) and satisfactory (R = 0.40–0.67) in case of the acoustic devices (LISST-ABS and Acoustic Doppler Current Profiler (ADCP)). These results suggest that using indirect methods could be an efficient alternative option of. These results suggest that using indirect methods could be an efficient alternative option suspended sediment analysis methods
This paper presented the comparative analysis of four indirect methods
Summary
Quantitative characteristics of the fluvial sediment transport play an important role in the natural morphological processes of the riverbed, in the quality of river habitats, and in many human activities associated with river management [1]. The erosion of the main riverbed changes the water supply of the tributaries and floodplains [3], which can lead to the isolation of tributaries and branch systems. The deposition of fine suspended sediment transport (silt and fine sand) can lead to the degradation of habitat quality [5] in the tributaries, sedimentation in the main riverbed can affect bank filtration systems [6,7], and changes flood conditions in floodplains [8].
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