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Hydrodynamic Characteristics of Submarine Composite Pipeline in a wave-current Coexisting Field

China Ocean Engineering 1994年第3期9卷 331-342页

作者： Li Yucheng and Zhang Ningchuan Professor, Dalian University of Technology, Dalian 116024 . Lecturer, Dalian University of Technology, Dalian 116024

-A composite pipeline is defined as a pipeline system composed of one big pipe and one or several small pipes. Based on the theory of wave- current interaction and physical model test, the hydrodynamic characteristics of the submarine composite pipeline in wave-current coexisting field (both regular and irregular waves) are investigated. The so-called 'modified diameter method' is used for analyzing the in-fine hydrodynamic coefficients of the composite pipeline, which are well related to KC number. The comparison of test data for regular and irregular waves shows that in the region of 90 > KC> 20, the results in these two cases can be unified. The effect of water depth is analyzed in details. The relationships between CD, CM and KC , which are based on the results of present research, may be used as a reference in engineering design.

关键词： submarine pipeline hydrodynamic coefficient wave-current action model test composite pipeline

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Analyses on Temporal and Spatial Variation Characteristics of Erosion and Deposition in the Front Edge of Salt Marsh Wetland

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Journal of Environmental Science and Engineering(B) 2022年第5期11卷 213-224页

作者： Wenjin Zhu Xue Li Mei Zhang Xiaotian Dong Jiangsu Ocean University Lianyungang 222000China

Taking Yancheng Nature Reserve Salt Marsh as the research object,the remote sensing images from 2005 to 2020 were interpreted by using remote sensing and geographic information system *** this paper,the temporal and spatial variation characteristics of erosion and deposition in the front edge of salt marsh wetland were *** influence of sea level rise on the annual change of salt marsh area was *** characteristics of flow and sediment movement in salt marsh and the causes of erosion and deposition in front of salt marsh were *** results showed that:(1)During 2005-2007,the sea level was relatively low,and Spartina alterniflora in salt marsh expanded to the *** 2007,the front edge of salt marsh wetland has coexisted with erosion and *** 2008 to 2010,the front edge of salt marsh wetland once again showed a trend of comprehensive deposition to the sea *** 2010 to 2012,the erosion of salt marsh wetland was *** 2012 to 2020,the front edge of salt marsh wetland in the range of 9 km south of Xinyang estuary was eroded.(2)The correlation analysis was carried out between the area of salt marsh wetland and sea level *** alterniflora is easily affected by sea level change,owing to it having a low ecological *** the rise of sea level,the area of salt marsh has been decreasing since 2013.(3)In the front sea area of salt marsh wetland,the maximum velocity of the ebb and flood can reach the threshold velocity during the spring *** sediment starts to move at water depth of 10 m under wave *** to wave stirs up sediment and current transports the sediment,resuspended sediment causes the erosion of marsh-edge scarps.

关键词： Salt marsh wetland remote sensing deposition erosion sea level rise wave-current action

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