International Coastal Symposium Research Articles

Numerical Investigation on Coastal Inundation of Storm Surges in Estuarine Wetland Waters

Zhang, H.; Zhang, M.; Shen, Y., and Xu, T., 2020. Numerical investigation on coastal inundation of storm surges in estuarine wetland waters. In: Malvarez, G. and Navas, F. (eds.), Proceedings from the International Coastal Symposium (ICS) 2020 (Seville, Spain). Journal of Coastal Research, Special Issue No. 95, pp. 1383-1388. Coconut Creek (Florida), ISSN 0749-0208.Coastal flooding caused by storm surges poses serious threats to coastal areas, communities and ecosystems. Plants that widely distributed in tidal flats play an important role in protecting the coastline from erosion, and mitigating extreme nature hazards. In this paper, based on the finite volume method (FVM), an explicit depth-averaged 2D model is established to investigate the interaction between salt marsh plants and storm surges in estuarine wetland waters. The Roe approximate Riemann solver, coupled with a drying-wetting boundary technique, is proposed in order to evaluate the effectiveness of interface fluxes for tracking the moving coastline and calculating storm surge land intrusions. The drag force induced by vegetation is added to momentum equations as an internal source to express the vegetation resistance to storm surges. The Jelesnianski 65 typhoon model is adopted to simulate the wind and pressure fields of the storm surges, and the background wind field is included in the total wind field. The proposed model is applied to investigate tidal levels, storm surges and flow currents during Typhoon Winnie and Typhoon Matsa in the Bohai Sea. Moreover, the model is used to explore the land intrusion and storm surge attenuation in Liao River Estuary (LRE) wetlands during Typhoon Winnie. Numerical predictions are found to match perfectly with those given by the measured data. The storm surge model can accurately reproduce the storm surge inundation process in wetland waters. The simulated results also indicate that salt marsh plants can reduce the flow current in vegetated regions, thus effectively attenuating the potential threats of storm surges.

A Bayesian Quantile Regression Approach for Nonstationary Frequency Analysis of Annual Maximum Sea Level in a Changing Climate

ABSTRACT Uranchimeg, S.; Kim, J-G.; Kim, J.-G.; Kwon, H.-H., and Lee, S.-O., 2018. A Bayesian Quantile Regression Approach for Nonstationary Frequency Analysis of Annual Maximum Sea Level in a Changing Climate. In: Shim, J.-S.; Chun, I., and Lim, H.S. (eds.), Proceedings from the International Coastal Symposium (ICS) 2018 (Busan, Republic of Korea). Journal of Coastal Research, Special Issue No. 85, pp. 536–540. Coconut Creek (Florida), ISSN 0749-0208. Sea level rise is primarily caused by global warming and has been a key consideration in design practices in coastal engineering. The design of coastal structures is currently based on a frequency analysis of the local sea level under the stationary assumption, meaning that the maximum sea level will not vary significantly over time. However, the stationary assumption for sea levels might not be valid in a changing climate. In such a context, this study proposes a systematic approach to investigate nonstationarity in annual maximum sea levels (AMSLs) and of...

Examining the Effect of Time Lags of Meteorological Variables on a Wave Forecasting Model

ABSTRACT Oh, J. and Suh, K.-D., 2018. Examining the Effect of Time Lags of Meteorological Variables on a Wave Forecasting Model. In: Shim, J.-S.; Chun, I., and Lim, H.S. (eds.), Proceedings from the International Coastal Symposium (ICS) 2018 (Busan, Republic of Korea). Journal of Coastal Research, Special Issue No. 85, pp. 1186–1190. Coconut Creek (Florida), ISSN 0749-0208. Since the last decade, wave forecasting using machine learning such as artificial neural networks (ANN) has been conducted. In this paper, a hybrid model is used, which was developed to forecast significant wave heights and periods by combining the empirical orthogonal function (EOF) analysis and wavelet analysis with the neural network (abbreviated as EOFWNN model). The EOF analysis enables the model to reflect the relationship between spatially distributed meteorological variables and waves to wave forecasting model and to forecast waves at multiple stations simultaneously. The wavelet analysis enables the ANN to deal with non-statio...

Risk Mapping Assessment by Means of Probabilistic Storm Scenarios in a Partially Engineered Beach: Anglet, France

de Santiago, I.; Morichon, D.; Arnoux, F.; Delpey, M., and Epelde, I., 2018. Risk mapping assessment by means of probabilistic storm scenarios in a partially engineered beach: Anglet, France. In: Shim, J.-S.; Chun, I., and Lim, H.S. (eds.), Proceedings from the International Coastal Symposium (ICS) 2018 (Busan, Republic of Korea). Journal of Coastal Research, Special Issue No. 85, pp. 796–800. Coconut Creek (Florida), ISSN 0749-0208.The characterisation of storms and the associated damage level is essential to design correct risk mitigation strategies. The study site, an engineered beach located in the South West of France, is exposed to frequent storm events. The objective of the present work is twofold: (1) to obtain a risk map along the different sectors of the beach and (2) to find risk indicators suitable for the present study site. The storm scenarios are obtained from a hindcast database that includes 66 years of wave parameters. Six storm types have been chosen to be representative of the extreme wave climate of the study site based on the energy flux (EF) threshold. The beach response to storm events is alongshore non-uniform and closely linked to the cross-shore position of the seawall. Total storm power combined with water level and beach volume/width seems to be the best set of risk indicators for the present study site.

Rhythmic Patterns of Coastal Formations as Signs of Past Climate Fluctuations on Uplifting Coasts of Estonia, the Baltic Sea

ABSTRACT Tonisson, H.; Suursaar, U.; Kont, A.; Muru, M.; Rivis, R.; Rosentau, A.; Tamura, T., and Vilumaa, K., 2018. Rhythmic patterns of coastal formations as signs of past climate fluctuations on uplifting coasts of Estonia, the Baltic Sea. In: Shim, J.-S.; Chun, I., and Lim, H.S. (eds.), Proceedings from the International Coastal Symposium (ICS) 2018 (Busan, Republic of Korea). Journal of Coastal Research, Special Issue No. 85, pp. 611–615. Coconut Creek (Florida), ISSN 0749-0208. On uplifting and tideless Baltic Sea Coasts in Estonia, a number of elevated mid to late Holocene beach ridge systems with rhythmic patterns are identified. Such uplifted coastal formations serve as archives of past variations in sea level and climate, as well as extreme events. Luminescence dating and interpretation of airborne LiDAR elevation data were used to identify the main formation mechanisms of such beach ridge systems. More extensive (up to 100–150 ridges) and clearer ridge patterns were found on faster emerging (up...

UAV Photogrammetry for Elevation Monitoring of Intertidal Mudflats

Dai, W.Q.; Li, H.; Zhou, Z.; Cybele, S.; Lu, C.Z.; Zhao, K.; Zhang, X.Y.; Yang, H.T., and Li, D.Y., 2018. UAV Photogrammetry for Elevation Monitoring of Intertidal Mudflats. In: Shim, J.-S.; Chun, I., and Lim, H.S. (eds.), Proceedings from the International Coastal Symposium (ICS) 2018 (Busan, Republic of Korea). Journal of Coastal Research, Special Issue No. 85, pp. 236–240. Coconut Creek (Florida), ISSN 0749-0208.Elevation is a significant factor in analyzing the topographical evolution of intertidal mudflats. However, the difficult access to the site due to the muddy sediment and the tidal creeks make the traditional observations more arduous. Unmanned aerial vehicle (UAV) platforms are nowadays a low-cost source of data for surveillance, mapping and 3D modeling. A multi-rotary UAV was set up with a camera to acquire multi-view images of mudflats in the Yancheng Rare Birds Nature Reserve, China. The procedure for deriving 3-D model was based on the Structure from Motion (SfM) algorithm for Multiview Stereophotogrammetry. Ground control points (GCPs), measured by Real Time Kinematic (RTK), were utilized as reference coordinates to generate the 3-D model and Digital Elevation Model (DEM). Ground references were applied to validate the accuracy of the DEM. However, due to the inhomogeneity and complexity of the ground, representing overall height with a single point would lead to uncertainty. In order to make the accuracy evaluation tend to reality, we employed circular ground references (CGRs) to validate the DEM. The CGRs were measured by a Rod Surface Elevation Table (Rod-SET) system within a circular area of radius 1.4 meter. For each survey, a DEM are computed by SfM photogrammetry, providing a surface representation of the study area. The spatial resolution for DEM is 7.5cm. With reference to the CGRs data, the DEM has a high vertical accuracy with a root mean square error (RMSE) of 10 cm. Repeated acquisitions of high-resolution DEMs enable monitoring of erosion and deposition, computing volumetric changes through time, and assessing sediment budgets. The results demonstrated that UAV can be used for regular mudflats monitoring activities and provide accurate insights into geomorphological processes.

Understanding Interactions between Shoreline Changes and Reef Outer Slope Morphometry on Takapoto Atoll (French Polynesia)

Collin, A.; Duvat, V.; Pillet, V.; Salvat, B., and James, D., 2018. Understanding Interactions between Shoreline Changes and Reef Outer Slope Morphometry on Takapoto Atoll (French Polynesia). In: Shim, J.-S.; Chun, I., and Lim, H.S. (eds.), Proceedings from the International Coastal Symposium (ICS) 2018 (Busan, Republic of Korea). Journal of Coastal Research, Special Issue No. 85, pp. 496–500. Coconut Creek (Florida), ISSN 0749-0208.Low-lying atoll reef islands host populations who are highly exposed to increasing ocean-related pressures resulting from accelerated sea-level rise, ocean warming and acidification. Since 2010, changes in the position of atoll reef island shoreline were estimated on more than 400 Pacific islands using multi-date image analysis. These studies have emphasized island persistence and highlighted the major role of local controls, i.e., human activities and tropical cyclones, in shoreline change. However, they provide limited knowledge on the ecological-morphological linkages driving island change. In order to contribute filling this gap, will be studied the statistical relationships between multi-decadal shoreline change and high-resolution outer slope morphometry of the eastern windward coast of Takapoto Atoll (Tuamotu Archipelago, French Polynesia). Shoreline change was estimated using 1969 airborne and 2013 spaceborne imagery, while outer slope morphometry was mapped at 2 m spatial resolution using 2016 spaceborne imagery. Nine classes of shoreline changes (N=1 402), ranging from >50 m accretion to >50 m erosion, were compared with averages of depth and slope metrics, derived from satellite-based bathymetry mapping. A strong positive correlation between shoreline erosion versus (i) depth and (ii) slope averages was obtained (R2=0.93 and R2=0.96, respectively): the deeper/steeper outer transects are, the more eroded shoreline transects are. Those findings suitably match the theory of wave propagation in shallow/gentle waters describing an increase in cross-shore sediment transfer with shallowness, thus explaining spatial variations in shoreline response. The implications of those original results for reef islands' future under climate change will be discussed.

Monitoring of Structural Dynamic Characteristics of Socheongcho Ocean Research Station

ABSTRACT Kim, W.; Yi, J.-H.; Min, I.K., and Shim, J.S., 2018. Monitoring of structural dynamic characteristics of Sochengcho Ocean Research Station. In: Shim, J.-S.; Chun, I., and Lim, H.S. (eds.), Proceedings from the International Coastal Symposium (ICS) 2018 (Busan, Republic of Korea). Journal of Coastal Research, Special Issue No. 85, pp. 1191–1195. Coconut Creek (Florida), ISSN 0749-0208. In order to study ocean and meteorological changes related to the global climate change and the global warming, Korea is operating several ocean research stations (ORS) such as Ieodo ORS, Gageocho ORS and Socheongcho ORS in remote ocean area. In July 2011, Typhoon Muifa directly hit the Gageocho ORS, and it was damaged to its structural members and various observation devices, unfortunately. After this, the Socheongcho ORS was constructed in 2014, and the structural health monitoring system was instrumented for studying the structural integrity under various external loading conditions. The purpose of this study is ...

Carbohydrate-dominant Phytoplankton and Protein-high Zooplankton in the Northern Part of the Southwestern East/Japan Sea in 2015

ABSTRACT Jo, N.; Kang, J.J.; Park, W.G.; Lee, B.R.; Lee, J.H.; Kim, Y.; Ahn, S.H.; Lee, D.; Min, J.-O.; Kang, C.-K., and Lee, S.H., 2018. Carbohydrate-dominant phytoplankton and protein-high zooplankton in the northern part of the southwestern East/Japan Sea in 2015. In: Shim, J.-S.; Chun, I., and Lim, H.S. (eds.), Proceedings from the International Coastal Symposium (ICS) 2018 (Busan, Republic of Korea). Journal of Coastal Research, Special Issue No. 85, pp. 371–375. Coconut Creek (Florida), ISSN 0749-0208. The biochemical compositions of phytoplankton and zooplankton were monthly investigated in the northern part of the southwestern East/Japan Sea from May to October in 2015 except August. Among the biochemical compositions of phytoplankton, carbohydrate composition (55.5 ± 7.3%) was most dominant during the study period. A significant negative relationship (r = −0.855, p < 0.01, n = 39) was found between the carbohydrate and lipid compositions of phytoplankton in this study, which can be due to a switc...

Seasonally Hypersaline Estuaries in Semiarid Climate Regions: an Example from the Northeast Brazil

ABSTRACT Valentim, S.S.; Menezes, M.O.B., and Teixeira, C.E.P., 2018. Seasonally hypersaline estuaries in semiarid climate regions: an Example from the Northeast Brazil. In: Shim, J.-S.; Chun, I., and Lim, H.S. (eds.), Proceedings from the International Coastal Symposium (ICS) 2018 (Busan, Republic of Korea). Journal of Coastal Research, Special Issue No. 85, pp. 6–10. Coconut Creek (Florida), ISSN 0749-0208. The Coreau river estuary is located in Ceara state, Northeast of Brazil and it is a shallow system, dominated by meso tides and barred about 35 km upstream from its mouth. Generally, hypersaline estuaries are naturally found in arid and semi-arid regions of Brazil, but the blockage the natural flow of rivers by dam interference can also increase hypersaline conditions and residence time in these estuaries. This study examines the importance of water balance and dam interference to the circulation of the Coreau river estuary, using observed data and Delt3D numerical simulations. Five discharge scenari...

Revisiting Head Loss of the Perforated Wall with Vertical Slits

Chun, I.; Kang, H., and Lim, H.S., 2018. Revisiting Head Loss of the Perforated Wall with Vertical Slits. In: Shim, J.-S.; Chun, I., and Lim, H.S. (eds.), Proceedings from the International Coastal Symposium (ICS) 2018 (Busan, Republic of Korea). Journal of Coastal Research, Special Issue No. 85, pp. 1056–1060. Coconut Creek (Florida), ISSN 0749-0208.A theoretical analysis and hydraulic experiments were performed to investigate the head loss that occurs when a flow passes through a perforated wall with vertical slits. In the theoretical analysis, continuity and energy equations were applied to a control volume set near the perforated wall. A non-dimensional energy equation was then derived to calculate head loss for the given values of the ratio of upstream and downstream depths and a Froude number based on downstream depth and velocity. The hydraulic experiments were performed by varying flow condition and the opening ratio of perforated walls. The non-dimensional energy equation and experimental results were finally used to evaluate the accuracy of three existing formulas.

Diachronic Condition Between Maximum Transgressive and Maximum Eustatic Sea-Level in Holocene: Subsidies for Coastal Management

Barboza, E.G.; Rosa, M.L.C.C.; Dillenburg, S.R.; Watanabe, D.S.Z.; Esteves, T.; Martins, E.M., and Gruber, N.L.S., 2018. Diachronic Condition Between Maximum Transgressive and Maximum Eustatic Sea-Level in Holocene: Subsidies for Coastal Management. In: Shim, J.-S.; Chun, I., and Lim, H.S. (eds.), Proceedings from the International Coastal Symposium (ICS) 2018 (Busan, Republic of Korea). Journal of Coastal Research, Special Issue No. 85, pp. 446–450. Coconut Creek (Florida), ISSN 0749-0208.The coastline of Pelotas Basin/Brazil displays alternate sectors showing long-term conditions of erosion and accretion during the Holocene, corresponding to retrogradational/transgressive and progradational/regressive barriers respectively. Currently, the retrogradational/transgressive sectors are suffering from problems related to coastal erosion, generating problems for the public and private sectors. Thus, it is important to understand if coastal sectors suffer long-term erosion. The transition between a retrogradational/transgressive and a progradational/regressive barrier is still not well known, and this is the reason why some GPR (Ground Penetrating Radar) profiles and a drilling were performed in the transition region between the two basic types of barriers that occur at São José do Norte/RS/Brazil. Six radarfacies of aeolian, lagoon and backshore/foreshore, upper/lower shoreface deposits were identified, and, also, the subsurface transition, between a transgressive phase and a regressive phase of the barrier was identified. In the transition, reflectors of a paleochannel and a delta system were interpreted as corresponding to active channel systems during the last glaciation, which was then partially reworked during the final stages of the postglacial marine transgression. The barrier at São José do Norte changed from retrogradational/transgressive to a progradational/regressive phase before the maximum eustatic sea-level which occurred at about 5.6 ka, defining a diachronic condition of the maximum transgression identified in the GPR record and dated by 14C at 6,652 – 6,424 yr cal BP. Based on these results, the area is considered to have a long-term progradational behavior. The identification of deposits with conditions of erosion and accretion in the subsurface gives important information to the understanding of the coastal evolution of Pelotas Basin and contributing to coastal management by identifying the long-term behavior of this sector.

The Study of Utilization and Precision Based on the Comparison and Analysis of Drone-Based Coastal Hazard Data and Its Application in the Ocean Environment

ABSTRACT Jun, K.; Jun, B.-H.; Lee, H.; Kim, S., and Tak, W., 2018. The study of utilization and precision based on the comparison and analysis of drone-based coastal hazard data and its application in the ocean environment. In: Shim, J.-S.; Chun, I., and Lim, H.S. (eds.), Proceedings from the International Coastal Symposium (ICS) 2018 (Busan, Republic of Korea). Journal of Coastal Research, Special Issue No. 85, pp. 811–815. Coconut Creek (Florida), ISSN 0749-0208. As more economic activities are developing along the coast, many studies are performed within the area concerning biological, social, economic factors closely linked to human activities. As coastal hazards occur in various categories, consistent monitoring would establish effective countermeasures and management of the coastal hazard region. Many surveys concerning seashore disasters exist already, like the bathymetric survey, beach profile survey, and shoreline survey. However, some of their disadvantages include high price, the use of equipme...

A Comparison of Numerical Models with Experimental Data for Stem Waves along a Vertical Wall due to Monochromatic Waves

ABSTRACT Shin, C.H.; Yoon, S.B., and Oh, S.C., 2018. A comparison of numerical models with experimental data for stem waves along a vertical wall due to monochromatic waves. In: Shim, J.-S.; Chun, I., and Lim, H.S. (eds.), Proceedings from the International Coastal Symposium (ICS) 2018 (Busan, Republic of Korea). Journal of Coastal Research, Special Issue No. 85, pp. 1121–1125. Coconut Creek (Florida), ISSN 0749-0208. Recently, vertical-type structures are frequently constructed in coastal area to protect ports and operation areas. When the waves propagate at oblique angles to the vertical-type structures, stem waves are generated along a structure due to the nonlinear interaction of incident and reflected waves. Thus, for the design of vertical structures the stem waves should be accurately evaluated using numerical models. In this study the performance of three nonlinear wave models based on different types of governing equations, REF/DIF 1, COULWAVE, and SWASH, was compared by using the measured data f...

Wave Nonlinearity Correction for Parametric Nearshore Wave Modelling

Zhang, C.; Zhang, Q.; Lei, G.; Cai, F.; Zheng, J., and Chen, K., 2018. Wave nonlinearity correction for parametric nearshore wave modelling. In: Shim, J.-S.; Chun, I., and Lim, H.S. (eds.), Proceedings from the International Coastal Symposium (ICS) 2018 (Busan, Republic of Korea). Journal of Coastal Research, Special Issue No. 85, pp. 996–1000. Coconut Creek (Florida), ISSN 0749-0208.Many phase-averaged parametric nearshore wave models are based on the energy balance concept and use linear wave theory to calculate wave parameters (e.g., wave energy, wave height, wave setup). For a wave propagating into shallow water, however, its shape becomes skewed/asymmetric and the linear wave theory may not be appropriate. Seven cases of model-data comparison for regular wave transformation over sloping and barred beaches are carried out. It is shown that the model using linear wave theory underestimates the regular wave height near the breakpoint, and overestimates the breaking roller length in the surf zone. An empirical method is proposed to improve the performance of the parametric wave models in shallow waters by correcting the key model parameters to include wave nonlinearity effects. This includes (1) development of a new empirical formula for the nonlinear wave shape factor, (2) using a nonlinear wave celerity formula, and (3) implementing a new empirical formula for breaking roller slope. These formulas are functions of wave steepness and Ursell number. The proposed method systematically improves predictions of wave height, wave setup and roller evolution under regular wave transformation with different beach configurations. In particular, the peaks of wave height and mean water level near the breakpoint as well as the roller length variation in the surf zone are accurately captured by the wave nonlinearity-corrected model.

Non-stationary Modeling of Trends in Extreme Water Level Changes Along the Baltic Sea Coast

ABSTRACT Kudryavtseva, N.; Pindsoo, K., and Soomere, T., 2018. Application of Non-stationary Extreme Value Modeling to Account for Trends in Extreme Water Level Changes Along the Baltic Sea Coast. In: Shim, J.-S.; Chun, I., and Lim, H.S. (eds.), Proceedings from the International Coastal Symposium (ICS) 2018 (Busan, Republic of Korea). Journal of Coastal Research, Special Issue No. 85, pp. 586–590. Coconut Creek (Florida), ISSN 0749-0208. The classic approach to extreme water levels and their return periods relies on the choice of a convenient extreme value distribution and the subsequent evaluation of its parameters. However, there is increasing evidence that these parameters vary with time owing to climate change. A novel non-stationary modeling of parameters of a generalized extreme value (GEV) distribution is implemented based on the block maximum approach, looking for linear trends in the location parameter of the GEV distribution. The analysis is performed for simulated NEMO-Nordic water level data ...

The Need for Coastal Hazard Prevention and its Valuation Methodologies in Europe

ABSTRACT Malvarez, G.; Navas, F.; Parker, D.J., and Penning-Rowsell, E., 2018. The Need for Coastal Hazard Prevention and its Valuation Methodologies in Europe. In: Shim, J.-S.; Chun, I., and Lim, H.S. (eds.), Proceedings from the International Coastal Symposium (ICS) 2018 (Busan, Republic of Korea). Journal of Coastal Research, Special Issue No. 85, pp. 926–930. Coconut Creek (Florida), ISSN 0749-0208. The artificialisation of the coast has significantly increased the potential for hazard affecting greater populations and still methodologies for valuation of coastal protection are lacking a multidimentisional approach taking into account both hydrometeorological as well as human induced risks in a way that swift decision making can be achieved. Environmental and economic appraisal is needed for managing coastal erosion and inundation as well as oil spills. In depth analyses from the UK, Poland, Italy, Greece and Spain legislative and planning frameworks show that methodologies vary significantly and that...

Anthropogenic Influences on the Tidal Prism and Water Exchange in Yueqing Bay, Zhejiang, China

Ying, C.; Li, R.; Li, X., and Liu, Y., 2018. Anthropogenic Influences on the Tidal Prism and Water Exchange in Yueqing Bay, Zhejiang, China. In: Shim, J.-S.; Chun, I., and Lim, H.S. (eds.), Proceedings from the International Coastal Symposium (ICS) 2018 (Busan, Republic of Korea). Journal of Coastal Research, Special Issue No. 85, pp. 961–965. Coconut Creek (Florida), ISSN 0749-0208.Yueqing Bay (YQB) is a semi-enclosed, calabash-shaped bay with shallow water depths and a large tidal range in the East China Sea that is relatively narrow in the middle and wide at its top and mouth. YQB has been subjected to considerable human activity, including reclamation and dam construction projects, over the past 50 years. To understand the changes in the hydrodynamics and water exchange abilities in YQB with respect to these anthropogenic influences, the tidal prism (TP) and water residence time (WRT) of YQB during the years 1964, 1984, 2002, and 2012 were investigated using a calibrated, two-dimensional hydrodynamic model based on the finite volume method. The simulation results show that the TP of YQB decreased by 21.3% and that the WRT increased by over 80%. The water exchange ability of YQB decreased continuously, especially during 1964–1984. The TP and WRT both show nonsynchronous historical changes with anthropogenic influences due to engineering intervention methods. The inner and outer parts of YQB exhibited considerably different sensitivities to anthropogenic influences due to the calabash shape of the bay. Large-scale engineering construction projects in coastal zones imposed significant impacts on the hydrodynamic characteristics in YQB that may have led to potential environmental and ecological issues.

Fate of Dissolved Trace Metals in the Waters of Bahia Magdalena Lagoon, Baja California Sur, México.

ABSTRACT S.B. Sujitha; M.P. Jonathan; D.C. Escobedo-Urias; Fernando Aguirre-Bahena; S.K. Sarkar; Lorena Elizabeth Campos Villegas, and E. Gonzalez Gomez., 2018. Fate of dissolved trace metals in the waters of Bahia Magdalena lagoon, Baja California Sur, Mexico. In: Shim, J.-S.; Chun, I., and Lim, H.S. (eds.), Proceedings from the International Coastal Symposium (ICS) 2018 (Busan, Republic of Korea). Journal of Coastal Research, Special Issue No. 85, pp. 431–435. Coconut Creek (Florida), ISSN 0749-0208. Concentrations of dissolved trace metals (Fe, Mn, Cr, Cu, Ni, Co, Zn, Cd, As) were determined in forty-one surface and forty bottom water samples procured from Bahia Magdalena lagoon, Baja California Sur, Mexico using an Atomic Absorption Spectrophotometry. In-situ measurements of temperature, salinity, dissolved oxygen and pH were also carried out in each station and high salinities classified the lagoon as Eurihaline. The region witness raised temperatures (avg. 28.92°C) due to their location in an arid s...

Influences of Earthquake Characteristics on Seismic Performance of Anchored Sheet Pile Quay with Barrette Piles

Chen, F.M.; Tan, H.M.; Chen, J., and Jiao, Z.B., 2018. Influences of Earthquake Characteristics on Seismic Performance of Anchored Sheet Pile Quay with Barrette Piles. In: Shim, J.-S.; Chun, I., and Lim, H.S. (eds.), Proceedings from the International Coastal Symposium (ICS) 2018 (Busan, Republic of Korea). Journal of Coastal Research, Special Issue No. 85, pp. 701–705. Coconut Creek (Florida), ISSN 0749-0208.Earthquake waves generated along crustal faults propagate through the bedrock and the local site deposits, impacting on any structure such as coastal structures. Seismic waves acting on the foundation of a sheet pile quay cause an oscillatory motion of the quay structure, and the seismic dynamic effect and soil liquefaction can significantly affect the safety of port structures. This paper reports the dynamic behaviour of a new sheet pile quay structure under seismic loads by using finite element method, and the new anchored sheet pile quay with barrette piles is developed to satisfy the requirements of higher elevation of retained soils and smaller wall deflection in practice. Both EL-Centro wave and Kobe wave are adopted in simulation to analyze the effect of earthquake characteristics on seismic performances of structure. The numerical calculation results show that the barrette piles are still effective to carry lateral earth pressure under the earthquake loads, and the maximum bending moment of structure does not occur when earthquake acceleration reaches the peak value. With the increase of earthquake peak acceleration value, the dynamic responses of structure are all increased at different degrees, and the amplification of barrette pile bending moment is the largest. The amplification coefficients of structure response under the Kobe wave loads are greater than those under the EL-Centro wave with the same PGA value, which indicates besides the peak value of earthquake wave, the responses of structure were also affected by other earthquake characteristics, such as spectrum, wave energy density and wave total energy.