Sediment transport over an accretional intertidal flat with influences of reclamation, Jiangsu coast, China

Wang, Ya Ping; Gao, Shu; Jia, Jianjun; Thompson, Charlotte; Gao, Jianhua; Yang, Yang

doi:10.1016/j.margeo.2011.01.004

Cited by 196 publications

(125 citation statements)

References 36 publications

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“…The distribution of water levels in the satellite images impacts the accuracy of tidal flat DEMs that are based on the waterline method. However, the tidal condition of the study area is complex; two tidal systems, the East China Sea progressive tidal wave and the Southern Yellow Sea rotary tidal wave, converge near the coastal waters of Jianggang [2]. The tide in the study region is not synchronous (especially on the eastern and western sides of the Dongsha Sandbank), so it is difficult to analyze the distribution of the water level and its influence on the accuracy.…”

Section: Potential Errors In the Waterline Methodsmentioning

confidence: 99%

“…They are important coastal geomorphologic systems that provide habitats for wildlife, resources for land reclamation and protection for the coast against extreme storm events [2,3]. However, tidal flats have been considered economically unimportant areas in the past, and knowledge of their past topography is limited by the poor accessibility and significant temporal dynamics of the tidal flats, technical and financial limitations and indifference.…”

Section: Introductionmentioning

confidence: 99%

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Quantitative Analysis of the Waterline Method for Topographical Mapping of Tidal Flats: A Case Study in the Dongsha Sandbank, China

Liu

Zhou

et al. 2013

Remote Sensing

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Abstract:Although the topography of tidal flats is important for understanding their evolution, the spatial and temporal sampling frequency of such data remains limited. The waterline method has the potential to retrieve past tidal flat topography by utilizing large archives of satellite images. This study performs a quantitative analysis of the relationship between the accuracy of tidal flat digital elevation models (DEMs) that are based on the waterline method and the factors that influence the DEMs. The three major conclusions of the study are as follows: (1) the coverage rate of the waterline points and the number of satellite images used to create the DEM are highly linearly correlated with the error of the resultant DEMs, and the former is more significant in indicating the accuracy of the resultant DEMs than the latter; (2) both the area and the slope of the tidal flats are linearly correlated with the error of the resultant DEMs; and (3) the availability analysis of the archived satellite images indicates that the waterline method can retrieve tidal flat terrains from the past forty years. The upper limit of the temporal resolution of the tidal flat DEM can be refined to within one year since 1993, to half a year since 2004 and to three months since 2009.

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Section: Potential Errors In the Waterline Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quantitative Analysis of the Waterline Method for Topographical Mapping of Tidal Flats: A Case Study in the Dongsha Sandbank, China

Liu

Zhou

et al. 2013

Remote Sensing

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“…Field measurement shows that (Wang et al, 2012), the SSCs were characterized by several peaks. Because of the stronger tidal current in Jiangsu coast, these peaks were associated with strong currents, combined wave-current interactions and intense turbulences due to initial flood surge.…”

Section: Huanghua Port Sea Areamentioning

confidence: 97%

“…Huanghua port locates at southwest of Bohai Bay, see (Yang and Hou, 2004) Distance from (Zhao and Han, 2007) Jingtang port sea area (Sun et al, 2010) The Jingtang port sea area, which locates at east side of Caofeidian in Bohai Bay, is a typical silty coast ( (Sun et al, 2010) Jiangsu coast (Wang et al, 2012) The surficial sediment in Jiangsu coast, which locates at north side of Yangtze Estuary, is composed mainly of silts and sandy silts (Figure 2-24),…”

Section: Huanghua Port Sea Areamentioning

confidence: 99%

“…Some scholars carried out boundary layer water and sediment observations in different coastal areas and collected waves, currents, and sediment concentration data under normal or stormy weather conditions (Madsen and Wood, 1993;McClennen, 1973;Williams et al, 1999;Wright et al, 1991). Zhao and Han (2007), Yang and Hou (2004), Sun et al (2010) andWang et al (2012) collected field data in Huanghua port, Jingtang port and Jiangsu coast, and analyzed the sediment transport in silt-dominated coasts. These data were also cited in this section to describe general sediment transport of silt-dominate sediments.…”

Section: Introductionmentioning

confidence: 99%

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Modelling and Analysis of Fine Sediment Transport in Wave-Current Bottom Boundary Layer

Zuo¹

2018

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Although all care is taken to ensure integrity and the quality of this publication and the information herein, no responsibility is assumed by the publishers, the author nor IHE Delft for any damage to the property or persons as a result of operation or use of this publication and/or the information contained herein. A pdf version of this work will be made available as Open Access via http://repository.tudelft.nl/ihe. This version is licensed under the Creative Commons To my family AbstractThe evolution and utilization of estuarine and coastal regions are greatly restricted by sediment problems. Inspired by the Caofeidian sea area in Bohai Bay, China, this study aims to better understand silty sediment transport under combined action of waves and currents, especially in the wave-current bottom boundary layer (BBL), and to improve our modelling approaches in predicting estuarine and coastal sediment transport.Field observations were carried out in northwestern Caofeidian sea area of Bohai Bay and field data were collected on several other silt-dominated coasts. Analysis shows that silt-dominated sediments are sensitive to flow dynamics: the suspended sediment concentrations (SSCs) increase rapidly under strong flow dynamics (i.e., waves or strong tidal currents which can stir up sediments), and high concentrations cause heavy sudden back siltation in navigation channels. In the following, details of silty sediment transport are studied, focusing on the BBL and high concentration layer (HCL).From laboratory experiments and theoretical analysis, an expression for sediment incipient motion is proposed for silt-sand sediment under combined wave and current conditions. The Shields number was revised by adding the cohesive force and additional static pressure, leading to an extended Shields curve.To study the HCL, a process based 1DV model was developed for flow-sediment dynamics near the bed in combined wave-current conditions. Based on the physical processes, special approaches for sediment movement were introduced, including approaches for different bed forms (rippled bed and 'flat-bed'), hindered settling, stratification effects, mobile bed effects, reference concentration and critical shear stress. The HCL was simulated and sensitivity analysis was carried out by the 1DV model on factors that impact the sediment concentration in the HCL. The results show that the HCL is affected by both flow dynamics and bed forms; the thickness of the HCL is about twice the height of the wave boundary layer; bed forms determine the shape of the concentration profile near the bottom, and flow dynamics determine the magnitude. For finer sediment, stratification effects and mobile bed effects impact the sediment concentration greatly.Finally, based on the 1DV model, the formulations of the mean sediment concentration profile of silty sediments were studied. By solving the time-averaged diffusion equation for SSC and considering the effects of bed forms, stratification and hindered settling, expressions for time-averaged SSC profile...

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Nodal variations and long‐term changes in the main tides on the coasts of China

2015

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The long-term changes in the main tidal constituents (O 1 , K 1 , M 2 , N 2 , and S 2 ) along the coasts of China and in adjacent seas are investigated based on 17 tide-gauge records covering the period 1954-2012. The observed 18.61 year nodal modulations of the diurnal constituents O 1 and K 1 are in agreement with the equilibrium tidal theory, except in the South China Sea. The observed modulations of the M 2 and N 2 amplitudes are smaller than theoretically predicted at the northern stations and larger at the southern stations. The discrepancies between the theoretically predicted nodal variations and the observations are discussed. The 8.85 year perigean cycle is identifiable in the N 2 parameters at most stations, except those in the South China Sea. The radiational component of S 2 contributes on average 16% of the observed S 2 except in the Gulf of Tonkin, on the south coast, where it accounts for up to 65%. We confirmed the existence of nodal modulation in S 2 , which is stronger on the north coast. The semidiurnal tidal parameters show significant secular trends in the Bohai and Yellow Seas, on the north coast, and in the Taiwan Strait. The largest increase is found for M 2 for which the amplitude increases by 4-7 mm/yr in the Yellow Sea. The potential causes for the linear trends in tidal constants are discussed.

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Sediment transport over an accretional intertidal flat with influences of reclamation, Jiangsu coast, China

Cited by 196 publications

References 36 publications

Quantitative Analysis of the Waterline Method for Topographical Mapping of Tidal Flats: A Case Study in the Dongsha Sandbank, China

Quantitative Analysis of the Waterline Method for Topographical Mapping of Tidal Flats: A Case Study in the Dongsha Sandbank, China

Modelling and Analysis of Fine Sediment Transport in Wave-Current Bottom Boundary Layer

Nodal variations and long‐term changes in the main tides on the coasts of China

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