Results 31 to 40 of about 22,760 (237)

Comparison of the longitudinal and lateral profiles of watercourses using sonar-based methods (ADCP) and hydrological analogy

open access: yesActa Universitatis Carolinae Geographica, 2014
In many cases, a flood wave has a pronounced transforming effect on the channel, and the knowledge of the watercourse longitudinal and lateral profiles is of great importance.
Pavel Novák   +5 more
doaj   +1 more source

H-ADCP-Based Online Discharge Monitoring Model Using Feature Adaptive Optimization [PDF]

open access: yes长江科学院院报
[Objective] To address the challenges faced by Horizontal Acoustic Doppler Current Profilers (H-ADCP) in online discharge monitoring applications—specifically, the difficulty in selecting index velocity (feature cells), the insufficient non-linear ...
WANG Xue, CHEN Jin-feng
doaj   +1 more source

Variation of Zooplankton Mean Volume Backscattering Strength from Moored and Mobile ADCP Instruments for Diel Vertical Migration Observation

open access: yesApplied Sciences, 2019
Zooplankton can be detected by using acoustic Doppler current profiler (ADCP) instruments through acquiring the mean volume backscattering strength (MVBS) data.
Angga Dwinovantyo   +4 more
doaj   +1 more source

Extreme flood-driven fluvial bank erosion and sediment loads: direct process measurements using integrated Mobile Laser Scanning (MLS) and hydro-acoustic techniques: Direct measurement of flood-driven erosion using MLS and MBES [PDF]

open access: yes, 2016
Copyright © 2016 John Wiley & Sons, Ltd. This methods paper details the first attempt at monitoring bank erosion, flow and suspended sediment at a site during flooding on the Mekong River induced by the passage of tropical cyclones.
Aalto, Rolf   +7 more
core   +4 more sources

High-Frequency Surface Wave Radar Current Measurement Corrections via Machine Learning and Towed Acoustic Doppler Current Profiler Integration

open access: yesApplied Sciences
This paper proposes an algorithm based on the long short-term memory (LSTM) network to improve the quality of high-frequency surface wave radar current measurements.
Zhaomin Xiong   +5 more
doaj   +1 more source

A new methodology for the quantitative visualization of coherent flow structures in alluvial channels using multibeam echo-sounding (MBES) [PDF]

open access: yes, 2010
In order to investigate the interactions between turbulence and suspended sediment transport in natural aqueous environments, we ideally require a technique that allows simultaneous measurement of fluid velocity and sediment concentration for the whole ...
Best, J L   +7 more
core   +3 more sources

Grid Turbulence Measurements with an Acoustic Doppler Current Profiler

open access: yesFluids
The motivation for this study is to investigate the abilities and limitations of a Nortek Signature1000 acoustic Doppler current profiler (ADCP) regarding fine-scale turbulence measurements.
Trygve K. Løken   +3 more
doaj   +1 more source

Morphodynamic change analysis of bedforms in the Lower Orinoco River, Venezuela [PDF]

open access: yesProceedings of the International Association of Hydrological Sciences, 2018
The Orinoco River has the third largest discharge in the world, with an annual mean flow of 37 600 m3 s−1 at its outlet to the Atlantic Ocean. Due to the presence of the Guiana Shield on the right bank, the lower reach of the Orinoco has a plan form ...
S. P. Yepez   +8 more
doaj   +1 more source

Monitoring of Yangtze River Discharge at Datong Hydrometric Station Using Acoustic Tomography Technology

open access: yesFrontiers in Earth Science, 2021
To continuously monitor the discharge of the Yangtze River, two coastal acoustic tomography (CAT) systems with synchronized transmission were deployed at the Datong hydrometric station of the Yangtze River from July 2018 to January 2021.
Ze-Nan Zhu   +14 more
doaj   +1 more source

Exploring diel vertical migration and spatiotemporal variation of zooplankton backscattering strength using an acoustic Doppler current profiler instrument in the Halmahera Sea, Indonesia [PDF]

open access: yesArchives of Biological Sciences
Given its critical role in marine ecosystems, this study comprehensively examined zooplankton distribution and behavior in the Halmahera Sea. The temporal and spatial dynamics of zooplankton acoustic backscatter values were analyzed using a 153.6 kHz ...
Maharani Gabriella Rosya   +6 more
doaj   +1 more source

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