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A PREDICTIVE MODEL FOR LONG-TERM shoreline change

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Journal of Hydrodynamics 1999年第1期11卷 56-63页

作者： Li Shao-wu (Department of Harbor and coastal Engineering, Civil Engineering School, Tianjin Universi-ty, Tianjin 300072, P. R. China) Tianjin Univ Tianjin China

In this paper a predictive model for long-term shoreline change is proposed on the basis of a numerical model of wave-induced current, which is applicable to rather complex boundary conditions in nearshore region, and a one-line model of shoreline change. As a computational example, the model is used in the prediction of shoreline change of the Nouakchott coast of Mauritania and consistent results between computation and measurements are obtained.

关键词： predictive model shoreline change

shoreline change Prediction Model for Coastal Zone Management in Thailand

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Journal of Shipping and Ocean Engineering 2012年第4期2卷 238-243页

作者： Siriluk Prukpitikul Varatip Buakaew Watchara Keshdet Apisit Kongprom Nuttom Kaewpoo Geo-lnformatics and Space Technology Development Agency Bangkok 10210 Thailand

The prediction of shoreline erosion is vital for coastal management. This study aims to utilize geo-informatics technology to increase accuracy of a shoreline prediction model along two study sites in Samutprakarn province and in Prachuabkirikhan province. Predicting coastline change using remote sensing together with GIS （geographic information system） is a spat^o-temporal technology, which can continuously provide perspectives of coastal areas. Due to a long term of operational period of LANDSAT satellite, it is useful to enhance accuracy of prediction model. LANDSAT-5 TM images acquired during 1999-2009 were used to produce historical shoreline vectors. Physical data were modified to be input data of digital shoreline analysis system. The model was validated. Linear regressions were applied in order to derive equations of erosion magnitude. The result presents that averaged erosion and accretion rate along Samutprakarn province was 22.30 meters/year and 2.94 meters/year, respectively. On the other hand, the average rate of coastal erosion along Prachuabkirikhan province was much lower, being 2.48 meters/year while the accretion rate was approximately 4.11 meters/year. The predicted shoreline change at Samutprakarn province in 2019 is about -132.69 ~ 0.758 meters while at Prachuabkirikhan is 40.58 ~ 0.0012 meters. In conclusion, this prediction model focused the changing of shoreline in long term and accuracy of the model could be improved by increasing number of shorelines vectors, transect intervals and resolution of satellite images. Clearly, the model is flexible and can be applied in other particular areas for coastal zone management in Thailand.

关键词： shoreline change coastal prediction model geo-informatics technology.

Numerical study of shoreline changes by emergency beach nourishment project at the Middle Beach of Beidaihe, China

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Acta Oceanologica Sinica 2012年第1期31卷 125-133页

作者： ZHANG Yu HE Lulu KUANG Cuiping PAN Yi GU Jie YANG Yanxiong ZHANG Jiabo College of Geoscience and Surveying Engineering China University of Mining and TechnologyBeijing 100083China Department of Hydraulic Engineering College of Civil EngineeringTongji UniversityShanghai 200092China College of Marine Science Shanghai Ocean UniversityShanghai 201306China Qinhuangdao Mineral Resource and Hydrogeological Brigade Hebei Geological Prospecting BureauQinhuangdao 066003China

Beach nourishment is a common coastal management strategy used to protect beach from erosion along the sandy coastlines. This method has been successfully applied to an emergency project at the West Beach of Beidaihe in the summer of 2008 and the full West Beach nourishment project in 2009-2010, which is the direct base of this study. Some basic information about the emergency engineering area at the Middle Beach is firstly described. The shoreline change of this area, including the analysis of beach width in five monitoring profiles in the bathing places of Middle Beach, is then discussed. After that a numerical modal based on one-line theory is established and the numerical results agree well with the measured shorelines, which indicates that the model is appropriate and is qualified to predict the shoreline change of the Middle Beach. With the same model and parameters, long-term performance of the project is predicted, and the result shows that without follow-up nourishment and project, the bathing places can remain suitable for bathing for about 10 a. It is suggested to nourish the beach in time and carry out the beach nourishment project for the full Middle Beach in Beidaihe.

关键词： one-line model numerical model shoreline change beach nourishmentl Middle Beach in Beidaihe

Numerical investigation of the effect of seasonal variations of depthof-closure on shoreline evolution

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International Journal of Sediment Research 2021年第1期36卷 1-16页

作者： Xuan Tinh Nguyen Minh Thanh Tran Hitoshi Tanaka Trung Viet Nguyen Yuta Mitobe Cong Dien Duong Department of Civil Engineering Tohoku University

The current study presents the effects of seasonal variations in the depth-of-closure（D;） on shoreline evolution using a numerical,one-line shoreline *** erosion of the southern beach of the Nha Trang Coast,which is located in south central of Vietnam,is selected as the study *** study area is immensely influenced by the tropical monsoon climate that has a clear pattern of large waves in the northeast monsoon season and calm waves in the non-monsoon *** analysis of the long-term measured shoreline variations from a video-camera system has found a strong correlation of these variations to the monsoon-dominated wave characteristics in the Nha Trang ***,a new approach for determining the depth-of-closure with consideration of the seasonal wave climate changes is purposed in the current *** implementing this new approach into a numerical,one-line shoreline model,it is found that the seasonal variations of D;appear to better describe the periodical shoreline evolution due to the monsoon-dominated wave characteristics for the Nha Trang *** important findings are considered to commonly apply for monsoon-dominated coastal regions in *** findings are useful information not only for scientific readers but also for the coastal authorities and managers in order to make better countermeasure plans against this kind of erosion mechanism in the future.

关键词： Video camera shoreline change One-line theory Nha Trang Beach Depth-of-closure Monsoon wave climate

shoreline management plan for a protected but eroding coast along the southwest coast of India

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International Journal of Sediment Research 2017年第4期32卷 495-505页

作者： Varangalil Noujas Kachapally Varghese Thomas Nalumakkal Raveendran Ajeesh Research Scholar National Centre for Earth Science Studies 2. Project Scientist ICMAM PD 3. Scientist G & Group Head Coastal Processes Group (Rtd.)National Centre for Earth Science Studies 4. Adjunct FacultyKerala University of Fisheries and Ocean Studies National Institute of Technology Karnataka Engineer (Offshore Structures) WS AtkinsSAIF Zone

Coastal erosion is a serious problem of concern along the southwest(SW) coast of India. Various coastal protection measures have been applied for the recovery of the coast, but the devastating effect of erosion still continues. The present study focuses on a coastal stretch situated on the southern sector of the SW coast of India, where Sundar and Sannasiraj(2006) proposed a groyne field along with an existing seawall to control severe erosion. In order to confirm the net littoral drift of this region and for a preliminary assessment of the performance of the groynes prior to construction of the proposed groyne field, two groynes were initially constructed as a pilot program in 2008-09. Periodic monitoring of shoreline position with the two groynes in place was carried out during 2009-14. A shoreline evolution model for the study region was setup, calibrated,and validated using field observations during 2010-11. In addition to traditional shoreline evolution modelling procedures, a profile simulation model was applied for simulating the shoreline behaviour during extreme monsoon seasons. The validated LITPACK model has been used to evaluate the performance of the proposed groyne field in controlling erosion, and the study also considered testing a modified transitional groyne field proposed as an alternative solution to the existing problem, and the modified transitional groyne field was found to be more effective than the prior design. A beach is expected to develop about 30-50 m within the groyne cells during the fair season which enhances the possibility of retaining a minimum beach width of 10 m during monsoon periods.

关键词： Sediment transport Erosion shoreline change Groyne field LITPACK model

Impact of Brunswick River Mouth Training Walls on Adjacent Beaches,Brunswick Heads,New South Wales,Australia

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海洋工程：英文版 2004年第2期18卷 207-220页

作者：黄海军 Andrew D.SHORT Thomas ZENG David HANSLOW Institute of Oceanology Coastal Studies Unit Department of Land and Water Conservation

River training walls have been built at scores of locations along the NSW coast and their impacts on shoreline change are still not fully understood. In this study, the Brunswick River entrance and adjacent beaches are selected for examination of the impact of the construction of major training walls. Thirteen sets of aerial photographs taken between 1947 and 1994 are used in a GIS approach to accurately determine the shoreline position, beach contours and sand volumes, and their changes in both time and space, and then to assess the contribution of both the structures and natural hydrodynamic conditions to large scale (years-decades and kilometres) beach changes. The impact of the training walls can be divided into four stages: natural conditions prior to their construction (pre 1959), major downdrift erosion and updrift accretion during and following the construction of the walls in 1959～1962 and 1966, diminishing impact of the walls between 1966 and 1987, and finally no apparent impact between 1987～1994. The impact extends horizontally about 8 km updrift and 17 km downdrift, and temporally up to 25 years.

关键词： human structure beach erosion and accretion beach downdrift/updrift shoreline change GIS

Effects of Coastline changes on Tide System of Yellow Sea off Jiangsu Coast,China

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China Ocean Engineering 2009年第4期23卷 741-750页

作者：陈可锋王艳红陆培东郑金海 State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University Nanjing Hydraulic Research Institute

On the basis of historical documents, this paper studies the evolutionary processes of the Jiangsu coast and re-estahhshes the positions of the shoreline in different periods. The East China Sea and the Yellow Sea mathematical models are applied to simulate and analyze the large-scale tidal waves changes under the influence of the coastal change in Jiangsu since 1855 when the Yellow River changed its lower course into the Bohai Sea. Results from this study can be summa- rized in the following aspects：（1） the coastline change strongly affects tidal waves in the region. Generally, the tidal amphtude decreases when the coastline changes in the north coast area of the abandoned Yellow River Delta, whilst increases in the south of this region. The maximum variation of tidal amphtude takes place near the Radial Sandbank. （2） Following the erosion of the abandoned Yellow River Delta in the past century, the non-tidal points of M2 and K1 partial tides move to southwest gradually. （3） During the early 20th century, with the coastline changing, tidal range decreased 30 - 60 cm. From the abandoned Yellow River mouth to the Lvsi Port, the maximum increase of tidal range can exceed nearly 150 cm. From the early 20th century to the early 21st century, the tidal range increases by 20- 50 cm outside the Radial Sandbank. Whereas, the tidal range reduced near the abandoned Yellow River mouth by 30 ~ 50 cm.

关键词： abandoned Yellow River Delta shoreline change numerical simulation the system of the Yellow Sea

Investigating the Effect of Winds and Storms on shoreline Erosion along the Coast of Tanzania

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Journal of Shipping and Ocean Engineering 2013年第1期3卷 61-69页

作者： Shigalla Mahongo1 Yohanna Shaghude Tanzania Fisheries Research Institute P.O. Box 9750 Dares Salaam Tanzania Institute of Marine Sciences University of Dar es Salaam P.O. Box 668 Zanzibar Tanzania

Wind data spanning 28 years （1977-2004） from four meteorological stations （Tanga, Zanzibar, Dar es Salaam and Mtwara） were analyzed to elucidate the effect of winds on coastal erosion along the coast of Tanzania. The investigation entailed wavelet analysis of the time series of winds which were related with past erosion events at each site. The study also analyzed qualitatively the incidences of tropical storms in relation to coastal erosion events along the coast. The results revealed that most of the critical erosion incidents in the past few decades were associated with periods of occurrence of extreme wind speeds and tropical storms. Furthermore, the results indicated that the wind speeds and the frequency and intensity of tropical storms had generally been increasing during the past three decades. The findings were consistent to those recently reported for the coast of Dar es Salaam. The increasing trends of winds and storms are considered to have direct impact on the wave climate with increased risk of shoreline wave-induced erosion that is already affecting relatively many parts of Tanzania.

关键词： coastal erosion shoreline change winds tropical cyclones Tanzania.

Study of the Coastal Vulnerability in Indramayu Regency, Indonesia

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Journal of Marine Science 2021年第2期3卷 8-15页

作者： Waluyo Amelia Fitrina Devi Taslim Arifin Marine and Fisheries Polytechnic of Karawang Ministry of Marine Affairs and FisheriesIndonesia Marine Research Center Ministry of Marine Affairs and FisheriesIndonesia

Coastal vulnerability is a condition of a coastal community or society that leads to or causes an inability to face the threat of *** level of vulnerability can be viewed from the physical(infrastructure),social,demographic,and economic *** vulnerability(infrastructure)describes a physical condition(infrastructure)that is prone to certain hazard *** coastal vulnerability areas can also be interpreted as a condition where there is an increase in the process of damage in the coastal area which is caused by various factors such as human activities and factors from the *** research aims to determine the level of coastal vulnerability in Indramayu coastal Regency with a Coastal Vulnerability Assessment(CVA)analysis approach and a Geographic Information System(GIS).Mapping the status of the vulnerability level of the Indramayu coastal area using the CVA method where the index range generated from the calculation of the four physical parameters mentioned above is between 2.887-3.651 or are in moderate vulnerability.A higher vulnerability value is found in several locations such as Juntikedokan and Benda *** is necessary to develop coastal protection in this area to prevent damage to the coastal area.

关键词： Coastal vulnerability assessment shoreline change Coastal slope Indramayu coastal Tidal type