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Process-based modeling of morphodynamics of a tidal inlet system

Acta Oceanologica Sinica 2010年第6期29卷 51-61页

作者： XIE Dongfeng GAO Shu PAN Cunhong Zhejiang Institute of Estuaries and Hydraulics Hangzhou 310020 China Ministry of Education Key Laboratory for Coast and Island Development Nanjing UniversityNanjing 210093 China

The morphodynamic evolution of an idealized inlet system is investigated using a 2-D depthaveraged process-based model,incorporating the hydrodynamic equations,Englund-Hansen’s sediment transport formula and the mass conservation *** model has a fixed geometry,impermeable boundaries and uniform sediment grain size,and driven by shore-parallel tidal *** results show that the model reproduces major elements of the inlet system,i.e.,flood and ebb tidal deltas,inlet *** is reached after several years when the residual transport gradually decreases and eventually *** equilibrium,the flow field characteristics and morphological patterns agree with the schematized models proposed by O’Brien （1969） and Hayes （1980）.The modeled minimum cross-sectional entrance area of the tidal inlet system is comparable with that calculated with the statistical P-A relationship for tidal inlets along the East China Sea *** morphological evolution of the inlet system is controlled by a negative feedback between hydrodynamics,sediment transport and bathymetric *** evolution rates decrease exponentially with time,i.e.,the system develops rapidly at an early stage while it slows down at later *** changes in hydrodynamics occur in the system;for example,the flood velocity decreases while its duration increases,which weakens the flood domination *** formation of the multi-channel system in the tidal basin can be divided into two stages;at the first stage the flood delta is formed and the water depth is reduced,and at the second stage the flood is dissected by a number of tidal channels in which the water depth increases in response to tidal scour.

关键词： tidal inlet morphological evolution sediment dynamics numerical modeling

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Sediment transport trends and cross-sectional stability of a lagoonal tidal inlet on the Central Coast of Vietnam

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International Journal of Sediment Research 2019年第4期34卷 322-334页

作者： Do Minh Duc Tran Thanh Tung Patrick Mc Laren Tran Ngoc Anh Dinh Thi Quynh Faculty of Geology VNU University of Science Vietnam National University Faculty of Marine and Coastal Engineering Thuyloi University Sed Trend Analysis Limited 4. Faculty of Meteorology Hydrology and Oceanography VNU University of Science Vietnam National University

Lagoonal tidal inlets are a typical morphology of the Central Coast of Vietnam. Recently, navigation channels in these inlets have become increasingly threatened by siltation. This study analyses the relations between sediment distribution and transport trends(using the technique of Sediment Trend Analysis-STAs) in the lagoonal system of the De Gi inlet and then proposes appropriate countermeasures against sand deposition in the navigation channel. The STA identified three types of transport trends in the De Gi inlet, namely dynamic equilibrium, net accretion, and net erosion. Processes associated with the tidal prism have resulted in trends of sediment transport and deposition across the flood and ebb tidal shoals, which maintain a present cross-sectional area of about 1000 m~2. However, longshore sediment transport from north to south resulting from northeast waves cause additional sand deposition in the channel. In addition, the effects of refraction associated with a nearby headland and jetty also increase sedimentation. These processes provide the main reasons for sediment deposition in the De Gi inlet. Short term and regular dredging helps to maintain the navigation channel. A system comprised of three jetties(north, south, and weir) is necessary to ensure the longterm cross-sectional stability of the navigation channel.

关键词： Lagoon tidal inlet Sediment Trend Analysis (STA) tidal prism Cross-sectional stability

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Mean water level setup/setdown in the inlet-lagoon system induced by tidal action—a case study of Xincun inlet,Hainan Island in China

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Acta Oceanologica Sinica 2008年第5期27卷 63-80页

作者： GONG Wenping SHEN Jian WANG Daoru Virginia Institute of Marine Science College of William and Mary Gloucester Point VA 23062USA Hainan Marine Development Planning and Design Research Institute Haikou 570125 China

With the tides propagating from the open sea to the lagoon, the mean water level （MWL） in the inlet and lagoon becomes different from that at the open sea, and a setup/setdown is generated. The change of MWL （setup/setdown） in the system imposes a great impact on regulating the development of tidal marshes, on determining the long-term water level for harbor maintenance, on the planning for the water front development with the flood control for the possible inundation, and on the interpretation of the historical sea level change when using tidal marsh peat deposits in the lagoon as the indicator for open sea＇ s sea level. In this case study on the mechanisms which control the setup/setdown in Xincun inlet, Hainan in China, the 2-D barotropic mode of Eulerian - Lagrangian CIRCulation （ELCIRC） model was utilized. After model calibration and verification, a series of numerical experiments were conducted to examine the effects of bottom friction and advection terms, wetting and drying of intertidal areas, bathymetry and boundary conditions on the setup/setdown in the system. The modeling results show that setup occurs over the inlet and lagoon areas with an order of one tenth of the tide range at the entrance. The larger the bottom friction is, a larger setup is generated. Without the advection term, the setup is reduced clue to a decrease of water level gradient to compensate for the disappearance of the advection term. Even without overtides, a setup can still be developed in the system. Sea level rise and dredging in the inlet and tidal channel can cause a decrease of setup in the system, whereas shoaling of the system can increase the setup. The uniqueness of the Xincun inlet with respect to MWL change is that there is no evident setdown in the inlet, which can be attributed to the complex geometry and bathymetry associated with the inlet system.

关键词： tidal inlet water level setup/setdown ELCIRC Hainan Island

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Relationships Between tidal Prism and Throat Area of tidal inlets Along Yellow Sea and Bohai Sea Coasts

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China Ocean Engineering 1996年第2期11卷 229-238页

作者： Zhang Renshun and Wang Yaping Professor, Dept. of Geography, Nanjing Normal University, Nanjing 210024 Lecturer, Nanjing Normal University, Nanjing 210024 Dept. of Geography Nanjing Normal University Nanjing 210024 Nanjing Normal University Nanjing 210024

The relationship between P (spring tidal prism) and A (throat area below mean sea level) is statistically analysed in terms of 29 tidal inlets or bays along the Huanghai Sea (Yellow Sea) and Bohai Sea coasts. For 15 of these tidal inlets, the best regression equation is A(km2) = 0.845 />(km3)1.20. The analysis shows that C and n are little different from those in the P-A relationship for the inlets of the South China Sea and East China Sea coasts. It is noted that the relationship between P and A is unstable because of the difference in sediment abundance. The study shows that a united P-A relationship can be obtained for the tidal inlets of lagoon type and bay-drowned-valley type, not containing some half-circle shape bays which confront deep water. These half-circle bays do not belong to tidal inlets because they do not have enough sediment abundance and are fairly open.

关键词： tidal inlet P-A relationship Huanghai Sea (Yellow Sea) Bohai Sea

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Hydrodynamics and suspended sediment transport at tidal inlets of Salut Mengkabong Lagoon, Sabah, Malaysia

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International Journal of Sediment Research 2010年第4期25卷 399-410页

作者： Md.Azharul HOQUE Bobita Golam AHAD Ejria SALEH University Malaysia Sabah Kota Kinabalu 88999 SabahMalaysia

Salut-Mengabong Lagoon is located at the west coast of Sabah facing the South China Sea. At the bay side of the main inlet the lagoon splits into Salut and Mengabong Channels. Sediment dynamics at the inlets of the lagoon have recently received considerable attention. But any direct measurement of hydrodynamics and sediment flux are yet to be well documented. This study covers the field measurements of current velocity, water flux, suspended sediment concentration and sediment flux across the three transects (main inlet, Salut entrance and Mengkabong entrance) during typical spring and neap tidal cycles in southwest monsoon and northeast monsoon. Temporal variations and timeaveraged values of measured parameters are discussed. The inlets of Salut-Mengkabong Lagoon are found to be ebb-dominated. The time-averaged velocities during spring tidal measurements are found to be higher in the main inlet followed by Mengkabong entrance and Salut entrance. Suspended sediment concentration and sediment fluxes are substantially higher in spring tidal cycles compared to the same in neap tidal cycles. During spring tidal cycles, ebb tidal sediment fluxes are higher than the flood tidal fluxes. The ebb dominated flux across the main inlet led to the large ebb shoal.

关键词： Hydrodynamics Suspended sediment Lagoon tidal inlet Salut Mengkabong

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Development and Extension of An Aggregated Scale Model: Part 1–Background to ASMITA

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China Ocean Engineering 2016年第4期30卷 483-504页

作者： Ian TOWNEND Zheng Bing WANG Marcel STIVE Zeng ZHOU University of Southampton Southampton S0171B JUK TU Delfl Delft 2600.44The Netherlands Deltares Delft 2600 MHThe Netherlands Jiangsu Key Laboratory of Coast Ocean Resources Development and Environment Security Hohai UniversityNanjing 210098China

Whilst much attention has been given to models that describe wave, tide and sediment transport processes in sufficient detail to determine the local changes in bed level over a relatively detailed representation of the bathymetry, far less attention has been given to models that consider the problem at a much larger scale （e.g. that of geomorphological elements such as a tidal fiat and tidal channel）. Such aggregated or lumped models tend not to represent the processes in detail but rather capture the behaviour at the scale of interest. One such model developed using the concept of an equilibrium concentration is the Aggregated Scale Morphological Interaction between tidal basin and Adjacent coast （ASMITA）. In this paper we provide some new insights into the concepts of equilibrium, and horizontal and vertical exchange that are key components of this modelling approach. In a companion paper, we summarise a range of developments that have been undertaken to extend the original model concept, to illustrate the flexibility and power of the conceptual framework. However, adding detail progressively moves the model in the direction of the more detailed process-based models and we give some consideration to the boundary between the two.

关键词： estuary tidal inlet morphology tides waves sediment transport

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Development and Extension of An Aggregated Scale Model:Part 2-Extensions to ASMITA

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China Ocean Engineering 2016年第5期30卷 651-670页

作者： Ian TOWNEND Zheng Bing WANG Marcel STIVE Zeng ZHOU University of Southampton Southampton S0171B JUK TU Delft Delft 2600 AAThe Netherlands Deltares Delft 2600 MHThe Netherlands Jiangsu Key Laboratory of Coast Ocean Resources Development and Environment Security Hohai UniversityNanjing 210098China

Whilst much attention has been given to models that describe wave, tide and sediment transport processes in sufficient detail to determine the local changes in bed level over a relatively detailed representation of the bathymetry, far less attention has been given to models that consider the problem at a much larger scale （e.g. that of geomorphological elements such as a tidal flat and tidal channel）. Such aggregated or lumped models tend not to represent the processes in detail but rather capture the behaviour at the scale of interest. One such model developed using the concept of an equilibrium concentration is the Aggregated Scale Morphological Interaction between tidal basin and Adjacent coast （ASMITA）. In a companion paper （Part 1）, we detail the original model and provide some new insights into the concepts of equilibrium, and horizontal and vertical exchange that are key components of this modelling approach. In this paper, we summarise a range of developments that have been undertaken to extend the original model concept, to illustrate the flexibility and power of the conceptual framework. However, adding detail progressively moves the model in the direction of the more detailed process-based models and we give some consideration to the boundary between the two.

关键词： estuary tidal inlet morphology tides waves sediment transport

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Developing a Process Driven Morphological Model for Long Term Evolution of a Dynamic Coastal Embayment

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Open Journal of Marine Science 2020年第3期10卷 93-109页

作者： Michael O’Shea Jimmy Murphy ERI MaREI Research University College Cork Cork Ireland

Numerical modelling of coastal morphology is a complex and sometimes unrewarding exercise and often not yielding tangible results. Typically, the underlying drivers of morphology are not properly accounted for in numerical models. Such inaccuracies combined with a paucity of validation data create a difficulty for coastal planners/engineers who are required to interpret such morphological models to develop coastal management strategies. This study develops an approach to long term morphological modelling of a barrier beach system that includes the findings of over 10 years of coastal monitoring on a dynamic coastal system. The novel approach to predicting the long term evolution of the area combines a mix of short term hydrodynamic monitoring and long term morphological modelling to predict future changes in a breached barrier system. A coupled wave, wind, hydrodynamic and sediment transport numerical model was used to predict the coastal evolution in the dynamic barrier beach system of Inner Dingle Bay, Co. Kerry, Ireland. The modelling approach utilizes the schematisation of inputs to reflect observed trends. The approach is subject to two stages of validation both quantitative and qualitative. The study highlights the importance of considering all the parameters responsible for driving coastal evolution and the necessity to have long term monitoring results for trend based validation.

关键词： Morphodynamic Modelling Sediment Transport tidal inlet Ebb tidal Bar Long Term Process

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The coast evolution and regulation in Wanquan River Estuary, Hainan Island

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Journal of Geographical Sciences 2004年第3期14卷 375-381页

作者：高建华陈国强欧维新 Zhu Dakui Nanjing Institute of Geography and Limnology CAS Nanjing 210008 China MOE Key Laboratory of Coastal and Island Development Nanjing University Nanjing 210093 China

In this paper, sediment samples were collected along the Wanquan beaches and sieved in the laboratory in order to obtain the grain size distributions and associated parameters, i.e. mean grain size, sorting coefficient and skewness. Furthermore, we have calculated the longshore drift sediment transport rates and equilibrium cross-sectional areas of the entrance channel by using the method of sedimentary dynamics. The results indicate that the longshore drift sediment transport is dominated by waves with a direction from south to north, which result in rapid changes of the entrance channel. Therefore, some suggestions were proposed for improving the water quality and restoring the ecosystem of estuary. The engineering method includes increasing the sea-route of entrance channel, tidal prism and water exchanges in Shamei Lagoon.

关键词： tidal inlet geomorphic evolution environment engineering Wanquan RiverEstuary

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Geomorphology of the Boao coastal system and potential effects of human activities-Hainan Island,South China

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Journal of Geographical Sciences 2005年第2期15卷 187-198页

作者： ZHUDakui YINYong PeterMARTINI TheKeyLaboratoryofCoast＆IslandDevelopment NanjingUniversityNanjing210093China Dept.LandResourceScience UniversityofGuelphOntarioCanadaNIE4E5

The Boao coastal system along the eastern coast of Hainan Island is a dynamic delta-tidal inlet-barrier formed during the late Holocene. The delta developed inside a shallow lagoon barred by a sandy barrier with a narrow, shallow tidal inlet opening. Two major distributary channels separated by small islands characterize the delta. The lagoon is silting up receiving and trapping sediments from both the river and, in minor measure during storms, through the tidal inlet opening and barrier washovers. The barrier at the tidal inlet is highly dynamic and changes its form, accreting (migrating spit) against the inlet during fair-weather conditions and being eroded during storms and river floods. The delta has almost completely filled the lagoon and major concerns exist on the effect that ongoing large development plans may have on the environment. These concerns include the effect on floods and rate of siltation once banks of the islands have been stabilized and floodwater and sediment load are impeded from spreading over the lowlands, and the effect of increasing pollutant loads from the new facilities on the ecosystems of the increasingly restricting lagoon water and on the seashores.

关键词： estuary coastal barrier coastal erosion tidal inlet flooding prevention lagoon Boao,Hainan Island Wanquan River delta Ground-Penetrating Radar

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