Impact of Sea Ice on the Hydrodynamics and Suspended Sediment Concentration in the Coastal Waters of Qinhuangdao, China

Jiang, Man; Pang, Chongguang; Liu, Zhiliang; Jiang, Jingbo

doi:10.3390/w12020611

Cited by 3 publications

(2 citation statements)

References 45 publications

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“…The research results demonstrated its successful use in the flow rate regulation system of the FL-12 wind tunnel's air supply, and the maximum absolute error was only 2.7 g/s. Jiang et al [80] proposed a digital valve group driven by a combination of PWM and PCM control signals. As depicted in Figure 14, the digital valve group consisted of four binary-coded digital valves and one small flow rate digital valve.…”

Section: Compound Coding Control Strategy 421 Pcm+pwmmentioning

confidence: 99%

Research Status and Prospects of Control Strategies for High Speed On/Off Valves

et al. 2023

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As the working conditions of host equipment become more complex and severe, performance improvement and increased intelligence of high speed on/off valves (HSV) are inevitable trends in the development of digital hydraulic technology. The characteristics of HSVs can be regulated by control strategies, which determine the comprehensive performance of the system. This paper discusses the development of control strategies for HSVs. First, the results of research in relation to the discrete voltage and pulse control of single HSVs and the coding control of parallel HSVs are summarized. In addition, the advantages, disadvantages and application scope of different control strategies are analyzed and compared. Finally, the development trends are predicted from the performance regulation, intelligent maintenance, intelligent coding and function programmability.

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Section: Compound Coding Control Strategy 421 Pcm+pwmmentioning

confidence: 99%

Research Status and Prospects of Control Strategies for High Speed On/Off Valves

et al. 2023

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“…The changes of SSC could be represented by the changes of remote sensing reflectance of water [63,64]. The SSC in the Yellow River estuary is very high (>200 mg/L).…”

Section: Sensitive Band Of Sscmentioning

confidence: 99%

GF-1 Satellite Observations of Suspended Sediment Injection of Yellow River Estuary, China

et al. 2020

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We analyzed the distribution of suspended sediments concentration (SSC) in the Yellow River Estuary based on data from GaoFen-1 (GF-1), which is a high-resolution satellite carrying a wide field-of-view (WFV) sensor and panchromatic and a multispectral (PMS) sensor on it. A new SSC retrieval model for the wide field-of-view sensor (M-WFV) was established based on the relationship between in-situ SSC and the reflectance in blue and near infrared bands. SSC obtained from 16 WFV1 images were analyzed in the Yellow River Estuary. The results show that (1) SSC in the study area is mainly 100–3500 mg/L, with the highest value being around 4500 mg/L. (2) The details of suspended sediment injection phenomenon were found in the Yellow River Estuary. The SSC distribution in the coastal water has two forms. One is that the high SSC water evenly distributes near the coast and the gradient of the SSC is similar. The other is that the high SSC water concentrates at the right side of the estuary (Laizhou Bay) with a significantly large area. Usually, there is a clear-water notch at the left side of the estuary. (3) Currents clearly influenced the SSC distribution in the Yellow River Estuary. The SSC gradient in the estuary was high against the local current direction. On the contrary, the SSC gradient in the estuary was small towards the local current direction. Eroding the coast and resuspension of the bottom sediments, together with currents, are the major factors influencing the SSC distribution in nearshore water in the Yellow River Estuary.

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Impacts of sea ice on suspended sediment transport during heavy ice years in the Bohai Sea

Liu,

Li,

Liu

et al. 2024

Front. Mar. Sci.

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The Bohai Sea, known for being the lowest latitude seasonally frozen sea area in the world, experienced severe ice conditions with a 30-year recurrence period during the winter of 2009-2010. Water-sediment flux is a crucial parameter for water quality management in marine environment. Using a highly accurate three-dimensional hydrodynamic and sediment transport numerical model, the significant wave height (Hs), current velocity, suspended sediment concentration (SSC) and water-sediment flux in the Bohai Sea during ice-covered and ice-free conditions are compared. Our findings indicate that the current velocity and sediment resuspension decrease under the ice coverage, but increase at the edge of the ice. The net outflow tidal flux (TF) in winter under ice-free conditions accounts for 24.5% of the whole year. The net outflow TF increases by 32.7% during ice-covered conditions, primarily due to the pressure difference between high air pressure superimposing heavy sea ice in the northwest Bohai Sea and the low air pressure in Bohai Strait, resulting in increased ebb velocity and decreased flood velocity. The net outflow suspended sediment flux (SSF) during ice-free conditions in the winter is 2.32×109 kg, while SSF increases by 1.24 times during ice-covered conditions, leading to worse water quality in the outer sea. The decrease of TF in the southern part of the Bohai Strait and the reduction of suspended sediment concentration by nearly 15 mg/l lead to the significant decrease in SSF. This study has significance guiding value for understanding the source-sink sedimentation system and water quality research in East China Sea.

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Impact of Sea Ice on the Hydrodynamics and Suspended Sediment Concentration in the Coastal Waters of Qinhuangdao, China

Cited by 3 publications

References 45 publications

Research Status and Prospects of Control Strategies for High Speed On/Off Valves

Research Status and Prospects of Control Strategies for High Speed On/Off Valves

GF-1 Satellite Observations of Suspended Sediment Injection of Yellow River Estuary, China

Impacts of sea ice on suspended sediment transport during heavy ice years in the Bohai Sea

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