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Eco-Environmental Impact Assessment of Pre-Leisure beach nourishment on the Benthic Invertebrate Community at Anping Coast

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China Ocean Engineering 2011年第2期25卷 215-236页

作者： Chun-Han SHIH Yi-Yu KUO Ta-Jen CHU Wen-Chieh CHOU Wei-Tse CHANG Ying-Chou LEE Institute of Fisheries Science National Taiwan University Taipei 10617 China Department of Civil Engineering National Chiao Tung University Hsinchu 30010 China Department of Leisure and Recreation Management Chung Hua University Hsinchu 30012 China Department of Civil Engineering Chung Hua University Hsinchu 30012 China

In recent years, owing to global warming and the rising sea levels, beach nourishment and groin building have been increasingly employed to protect coastal land from shoreline erosion. These actions may degrade beach habitats and reduce biomass and invertebrate density at sites where they were employed. We conducted an eco-environmental evaluation at the Anping artificial beach-nourishment project area. At this site, sand piles within a semi-enclosed spur groin have been enforced by use of eco-engineering concepts since 2003. Four sampling sites were monitored during the study period from July 2002 to September 2008. The environmental impact assessment and biological investigations that we conducted are presented here. The results from this study indicate that both biotic （number of species, number of individual organisms, and Shannon-Wiener diversity） and abiotic parameters （suspended solids, biological oxygen demand, chemical oxygen demand, dissolved inorganic nitrogen, dissolved inorganic phosphorus, total phosphorus, total organic carbon, median diameter, and water content） showed significant differences before and after beach engineering construction. Biological conditions became worse in the beginning stages of the engineering but improved after the restoration work completion. This study reveals that the composition of benthic invertebrates changed over the study period, and two groups of organisms, Bivalvia and Gastropoda, seemed to be particularly suitable to this habitat after the semi-enclosed artificial structures completion.

关键词： beach nourishment benthic invertebrate eco-engineering ecological restoration spur groin

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Shoreline Change Modeling on Emergency beach nourishment Project on West beach of Beidaihe,China

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China Ocean Engineering 2010年第2期24卷 277-289页

作者：匡翠萍潘毅张宇刘曙光杨燕雄张甲波 Department of Hydraulic Engineering College of Civil EngineeringTongji University Department of Civil & Environmental Engineering Jackson State UniversityJackson School of Resources and Safety Engineering China University of Mining and Technology(Beijing) Qinhuangdao Mineral Resource and Hydrogeological Brigade Hebei Geological Prospecting Bureau

By use of a shorehne-change numerical model （GENESIS） based on one-line theory, a preliminary modeling study on shoreline changes caused by a beach nourishment project in Beidaihe, China, is presented in this paper. Firstly, the GENESIS model is verified and model sensitivity to the major parameter changes is discussed by simulating a hydraulic model test. The beach nourishment project, after that the shoreline change is kept being monitored, is a small-scale emergency one carried out to use two bathing places on the west beach in the summer, 2008. In this paper the shoreline changes caused by the beach nourishment project are modeled by the GENESIS model, and the computed results fit well with the measured shorelines. With the same model and parameters, a long-term performance of the project is predicted, and the result shows that the bathing places only can be suitable for bathing in 2 to 3 years without subsequence nourishment project. Therefore, it is proposed to nourish the beaches in time to keep the service life of the beach in recent years and carry out the beach nourishment project for the whole west beach as soon as possible.

关键词： GENESIS model shoreline change beach nourishment west beach in Beidaihe

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Potential morphological responses of an artificial beach to a flood in extreme events: field observation and numerical modelling

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Acta Oceanologica Sinica 2024年第7期43卷 78-92页

作者： Jiadong Fan Cuiping Kuang Xuejian Han Lixin Gong Huixin Liu Jiabo Zhang College of Civil Engineering Tongji UniversityShanghai 200082China The Eighth Geological Brigade Hebei Geological and Mineral Exploration Development BureauQinhuangdao 066001China Marine Ecological Restoration and Smart Ocean Engineering Research Center of Hebei Province Qinhuangdao 066001China

Conch Island is a typical artificial island at the Tanghe Estuary in Bohai Sea,*** improve natural environment and boost local tourism,beach nourishment will be applied to its north-western *** projected beach is landward and opposite to the Jinmeng Bay ***,with climate changes,frequent heavy rainfalls in Hebei Province rise flood hazards at the Tanghe *** this circumstance,potential influences on the projected beach of a flood are investigated for sustainable managements.A multi-coupled model is established and based on the data from field observations,where wave model,flow model and multifraction sediment transport model are *** addition,the impacts on the projected beach of different components in extreme events are discussed,including the spring tides,storm winds,storm waves,and sediment *** numerical results indicate the following result.(1)Artificial islands protect the coasts from erosion by obstructing landward waves,but rise the deposition risks along the target shore.(2)Flood brings massive sediment inputs and leads to scours at the estuary,but the currents with high sediment concentration contribute to the accretions along the target shore.(3)The projected beach mitigates flood actions and reduces the maximum mean sediment concentration along the target shore by 20%.(4)The storm winds restrict the flood and decrease the maximum mean sediment concentration by 21%.With the combined actions of storm winds and waves,the maximum value further declines by 38%.(5)A quadratic polynomial relationship between the deposition depths and the maximum sediment inputs with flood is established for estimations on the potential morphological changes after the flood process in extreme *** the uncertainty of estuarine floods,continuous monitoring on local hydrodynamic variations and sediment characteristics at Tanghe Estuary is necessary.

关键词： beach nourishment flood artificial island sediment transport extreme events storm

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Variation in cross-shore wind speeds influenced by the morphology of nourished beach

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Acta Oceanologica Sinica 2023年第7期42卷 149-159页

作者： Xu Chen Jianhui Liu Feng Cai Yanyu He Bailiang Li Hongshuai Qi Shaohua Zhao Gen Liu Third Institute of Oceanography Ministry of Natural ResourcesXiamen 361005China Key Laboratory of Marine Ecological Conservation and Restoration Ministry of Natural ResourcesXiamen 361005China Key Laboratory of Marine Ecology Protection and Restoration of Fujian Province Xiamen 361005China Department of Health and Environmental Sciences Xi’an Jiaotong-Liverpool UniversitySuzhou 215123China

The cross-shore variation in wind speeds influenced by beach nourishment,especially the dramatic changes at the nourished berm,is important for understanding the aeolian sand transport processes that occur after beach nourishment,which will contribute to better beach nourishment project design on windy *** this paper,the influencing factors and potential mechanism of wind speed variation at the edge of a nourished berm were *** observations,together with the Duna model,were used to study the cross-shore wind speed distribution for different nourishment *** results show that the nourished berm elevation and beachface slope are the main factors controlling the increase in wind speed at the berm *** the upper beach slope is constant,the wind speed at the berm edge has a positive linear correlation with the berm *** the berm elevation remains constant,the wind speed at the berm edge is also proportional to the upper beach *** the coupling effects of nourished berm elevation and beachface slope,a model for predicting the wind speed amplification rate at the nourished berm edge was established,and the underlying coupling mechanism was illustrated.

关键词： beach nourishment nourished beach berm cross-shore wind speed Duna model wind speed amplification rate

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A Shoreline Change Analysis Along the Coast Between Kanyakumari and Tuticorin, India, Using Digital Shoreline Analysis System

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Geo-Spatial Information Science 2011年第4期14卷 282-293页

作者： SHEIK Mujabar CHANDRASEKAR National College of Engineering Anna University of Technology Centre for Geotechnology Manonmaniam Sundaranar University

The shoreline is one of the rapidly changing landforms in coastal areas. They are the key element in coastal GIS and provide the most information on coastal land form dynamics. Therefore, accurate detection and frequent monitoring of shorelines is very essential to understand the coastal processes and dynamics of various coastal features. The present study is to investigate the shoreline changes along the coast between Kanyakumari and Tuticorin of south India （where hydrodynamic and morphologic changes occur continuously after the December 2004 tsunami） by using Digital Shoreline Analysis System （DSAS）, an extension of ArcGIS. Multidate 1RS and Landsat Satellite data （1999, 2001, 2003, 2005, 2007, and 2009） are used to extract the shorelines. The data is processed by using the ERDAS IMAGINE 9.1 software and analyzed by ArcGIS 9.2 workstation. The rates of shoreline changes are estimated by three statistical methods, namely, End Point Rate （EPR）, Linear Regression Rate （LRR）, and Least Median of Squares （LMS） by using DSAS. The study reveals that most of the study area has undergoing erosion. Both natural and anthropogenic processes along the coast modify the shoreline configuration and control the erosion and accretion of the coastal zones. The coastal zones along the estuary have experienced accretion due to the littoral processes. The zones with headlands have more eroded than other zones along the study area. The study also shows that the coastal zones where sand is mined have relatively more rate of erosion than that of the other zones. Improper and unsustainable sand mining may also lead to severe erosion problem along this area. The shoreline change rates are altered by various geological processes along the coast. Thus, the present study implies that proper beach filling and nourishment projects should be made in the study area to save from hazards. It also indicates the advantage and suitability of DSAS to assess the shoreline changes compared with the tradi

关键词： coastal zone management erosion accretion hazards beach nourishment

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Estimating shoreline response to sea level rise:the equilibrium model

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Marine Science Bulletin 2020年第1期22卷 1-12页

作者： LI Wenshan GAO Tong WANG Hui DONG Junxing LI Huan XU Hao ZUO Changsheng National Marine Data and Information Service 300171 TianjinChina

Potential sandy coast erosion and socio-economic impacts under sea level rise scenarios as well as socio-economic pathways were assessed in Liaodong *** show that sea level is projected to rise by 20-43 cm in Liaodong Bay by *** dry land loss increases in all sea level rise scenarios,with the maximum loss of 32.1 km2 in 2100 under *** erosion results in forced migration,and the forced migration is higher under SSP3 than other pathways due to its higher population growth rate,reaching the highest of 3.1×10^4 under SSP3/RCP8.5 in ***,the differences of forced migration among all scenarios increas after 2050,and the migration increasing rates tend to decrease under RCP2.6 and *** maximum economic loss due to coastal erosion will reach 8.05 billion yuan under SSP5/RCP8.5 in 2100,in which land loss cost is two order less than migration cost,and the share of total erosion-induced economic loss in local GDP varies from 1.12‰ to 4.76‰ under all scenarios,which is an important indicator to draw local government's attention to take measures such as beach nourishment,especially for tourist ***,it is recommended by cost-benefit analysis to carry out nourishment mainly on beaches with high value,while there is no need for nourishment in areas where erosion impacts are negligible.

关键词： sea level rise coastal erosion equilibrium profile beach nourishment socio-economic loss

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