A method for correcting discharge of boat-mounted ADCP measurements

Chen, Zhigao; Pan, Shun; Zhou, Fengnian; Ban, Ya; Li, Meng; Li, Dajun

doi:10.1016/j.flowmeasinst.2021.101954

Cited by 7 publications

(5 citation statements)

References 11 publications

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“…Honestly, it can be expected that the more specialized instruments may give more accurate information about the phytoplankton and the sediments, which may be helpful for our future works. Due to the bulk measurement, the acquisition of chlorophyll and ABI is affected by hydro‐climatic conditions (Kim et al 2020; Chen et al 2021 a , b ). By comparison, our prototype can directly measure and identify the individual particles, and then explicitly obtain the number of phytoplankton and sediments in water over a period of time, and thus unambiguously get the relative proportion of different types of particles.…”

Section: Discussionmentioning

confidence: 99%

“…Moreover, polarization measurement can be easily adapted into the current scattering measurement system, by adding the polarization state generator (PSG) and the polarization state analyzer (PSA). And the individual measurement of the particles has the advantage to explicitly obtain the particulate compositions in suspension (Chen et al 2021a(Chen et al , 2021b, and also the accurate acquisition of the polarization state of the scattered light is necessary to probe the particles (Liao and Ma 2015). Due to diverse types of the marine particles, the accurately measuring of the polarization state of light scattered by the individual particles may help to recognize the particulate categories.…”

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confidence: 99%

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Classification of suspended particles in seawater using an in situ polarized light scattering prototype

Deng,

Wang,

Guo

et al. 2023

Limnology & Ocean Methods

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Classification of suspended particles characterizes the composition of seawater, which helps the interpretation of remote sensing data and promotes the researches of the matter exchanges in ocean processes. In this article, an in situ prototype based on polarized light scattering is introduced, and its ability to classify the suspended particles is demonstrated. The experimental results show that the prototype can classify the sediments, microplastics, and phytoplankton in seawater with an accuracy larger than 85%, and further calculate their relative proportion in water. In the summer and winter of 2020, the prototype was deployed three times in Daya Bay and lasted for dozens of hours each time, along with the additional commercial sensors, that is, Environment X Observation (EXO) and Acoustic Doppler Current Profiler (ADCP). The chlorophyll content measured by EXO and the acoustic backscatter intensity measured by ADCP are respectively related to the number of algal cells and sediments in the water, which helps to interpret the data of the prototype. The results of field data show that the prototype can effectively classify phytoplankton and sediment particles in seawater and monitor their temporal variations. Besides, the retrieved information of the suspended particles is consistent with the analysis from the flow dynamics and season variations in Daya Bay. These results indicate the ability of this prototype to classify the suspended particles in seawater, which promises its potential contribution to particulate oceanography in the future.

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Classification of suspended particles in seawater using an in situ polarized light scattering prototype

Deng,

Wang,

Guo

et al. 2023

Limnology & Ocean Methods

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“…For the perception of seawater velocity and flow direction, the seawater velocity vector is obtained by using Acoustic Doppler velocity profiler (ADCP) based on the Doppler frequency shift of the acoustic signal scattered by particles in the water 20 . References [21][22][23][24] study the data processing of ADCP to improve the detection effect of water flow.…”

Section: Environment Awarenessmentioning

confidence: 99%

Development status and trend of autonomous operation for unmanned surface vehicle

Cai

2022

International Conference on Computer Application and Information Security (ICCAIS 2021)

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Autonomous operation for unmanned surface vehicle (USV) is the core competence for USV, and an important mean for unmanned and intelligent operation. USVs can be used for multi-mission, so autonomous operation for USV faces a lot of challenges, such as complex and changeable marine environmental factors, limited means of awareness in sea, low degree of automated operational decisions, difficult integration control of sailing and combat equipment. This study summarizes the development status of autonomous operation for USVs from awareness, decision and control. It addresses the difficult issues and current main technologies of autonomous operation for USVs, and points out the deficiencies of the technologies. Finally, based on the analyses of development status, it addresses the development trend of autonomous operation for USV.

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“…Straightforward volume calculations can be used to determine water fluxes, where the detailed intertidal bathymetry, tidal current, and accurate tidal water level data based on field surveys are required to obtain a complete coverage of tidally affected areas over tidal timescales (Fukamachi et al, 2010;Li et al, 2018;Shin et al, 2022). For example, shipboard ADCPs measurements can be used to provide vertical profiles of velocities and to compute tidally varying discharges in estuarine channels and regions (Dinehart and Burau, 2005;Chen et al, 2021;Zhu et al, 2022). The data from bottom-mounted ADCPs can be used to describe seasonal and spatial variation in current structure, such as volume transport, which was calculated across the Jeju Strait and Portsmouth Harbour (Onabule et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Field survey and analysis of water flux and salinity gradients considering the effects of sea ice coverage and rubber dam: a case study of the Liao River Estuary, China

Guo

Yang

et al. 2023

Front. Mar. Sci.

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Predicting net river fluxes is important to promote good water quality, maritime transport, and water exchange in estuaries. However, few studies have observed and evaluated net water fluxes to estuaries under complex conditions. This study used advanced survey techniques to obtain high-frequency monitoring data of cross-sectional current velocity, water level, and salinity in the Liao River Estuary (LRE) from 2017 to 2020. The net water flux into the sea was computed based on field data and the impacts of the rubber dam and sea ice cover on water flux and salinity processes were analyzed in the study region. In the Liao River Station (LRS), the fluctuations of water level and discharge were not obvious in winter due to the sea ice cover. There were significant seasonal and inter-annual changes in water fluxes due to variability in river discharge and tidal oscillations. The results also showed that the net water flux into the sea from the LRS was positive in wet season, and greater during ebb tides than flood tides. The net water fluxes in the normal and dry seasons were mostly negative due to the influence of tides, indicating that the annual runoff from the Liao River fluctuated greatly throughout the year. The water flux in the LRS was more suitable for representing water flux into the sea than the Liujianfang Hydrometric Station (LHS) in the LRE. The impacts of the rubber dam and Panshan Sluice on water fluxes to the sea were both significant. Lower salinity in the study area coincided mostly with height water fluxes to the sea and periods when the rubber dam was raised. This study results provide us new insights to measure the water flux into sea under the condition of ice cover in the tidal reach of estuary and the method can be used for water flux observation for other estuaries.

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A method for correcting discharge of boat-mounted ADCP measurements

Cited by 7 publications

References 11 publications

Classification of suspended particles in seawater using an in situ polarized light scattering prototype

Classification of suspended particles in seawater using an in situ polarized light scattering prototype

Development status and trend of autonomous operation for unmanned surface vehicle

Field survey and analysis of water flux and salinity gradients considering the effects of sea ice coverage and rubber dam: a case study of the Liao River Estuary, China

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