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Quantitative analysis of microplastics in coastal tidal-flat reclamation in Dongtai,China

Frontiers of Environmental Science & Engineering 2022年第8期16卷 235-245页

作者： Xue Bai Chang Li Lingyu Ma Pei Xin Fengjie Li Zhenjia Xu Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education College of EnvironmentHohai UniversityNanjing 210098China Yangtze Institute for Conservation and Development Hohai UniversityNanjing 210098China

coastal tidal flats have received considerable attention in recent years,as they provide a direct channel for the discharge of terrestrial microplastics into the *** reclamation is occurring increasingly frequently in coastal tidal-flats;however,the environmental impacts of these activities remain ***,this pioneering study assessed the microplastic emission characteristics of reclamation geotextiles and performed a risk assessment *** characterization of geotextile samples collected from five sites in Dongtai,China,provided evidence of sedimentary *** on several assumptions,the average abundance of microplastics in soil covered by geotextiles was estimated to reach 349137 particles/kg dry weight,with the total microplastic load in the reclaimed area estimated to be 20.678.06 *** with previous studies,this research demonstrates that coastal reclamation areas store a high concentration of microplastics,aggravating marine microplastic ***,conditional fragmentation model results revealed that the weathering and distribution characteristics of soil microplastics in coastal tidal-flat areas exhibit spatial heterogeneity,being more easily affected by natural factors(such as tides)than those in inland *** a result of tides,the annual discharge of geotextile-originating microplastics from the studied areas into the ocean was approximately 2465.52960.77 *** findings prove that the risks posed by engineering-microplastics are significant,indicating that further investigations are required on the precise laws of transfer and migration,as well as the toxicity mechanisms,in order to improve analytical techniques and policies in this field.

关键词： coastal reclamation Engineering geotextiles Soil microplastics Weathering simulation Marine emission

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The Effects of reclamation Activity and Yellow River Runoff on Coastline and Area of the Laizhou Bay,China

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Journal of Ocean University of China 2021年第3期20卷 729-739页

作者： XU Yandong GAO Huiwang WEI Xiao ZHU Jinlong Key Laboratory of Marine Environment and Ecology Ministry of EducationOcean University of ChinaQingdao 266100China Shandong Provincial Key Laboratory of Restoration for Marine Ecology Shandong Marine Resource and Environment Research InstituteYantai 264006China Laboratory for Marine Ecology and Environmental Science Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China

Study on morphological changes of a bay can help to identify the effects of anthropogenic activities on coastal environ-ment and guide the exploration of marine *** this paper,morphological data including coastline and water areas in five discrete years between 1968 and 2015 were selected and extracted from the remote sensing images and historical marine charts to study the morphological changes in Laizhou Bay(LZB),one of the bays in the southwest of the Bohai Sea.A systematic analysis on spatial variations of the coastline and the surface areas of different types of waters in LZB was *** results showed that the surface area of LZB was decreased by 1253.2km^(2)in the last half century,which is 17.4%of the total in the *** areas of the natural wetland and the intertidal zone were decreased by 17.2%and 56.1%,respectively,and the average water depth varied from 9.05 m to 8.16m at low tide level from 1968 to *** coastline and shape variations of the bay turned to be complex after the 1980s,and the shape index of LZB showed an increasing trend in more recent *** centroid of the bay generally migrated to the northeast direction,i.e.,the direction of the center of the Bohai Sea,and the shrinking direction of the bay was consistent with the migration direction of the *** reclamation area during 1968-2015 in LZB was 1201.7km^(2),and 94.1%was in the inter-tidal *** overall morphological change of the bay during the last half century was mainly controlled by the coastal reclamation activities,and the Yellow River runoff including the river course change and sediment load variation was also an important control-ling factor.

关键词： morphological change coastal reclamation Yellow River runoff Laizhou Bay

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System simulation of the eco-environment effects on the coastal zone of Bohai Bay, China

System simulation of the eco-environment effects on the coas...

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第40届中国控制会议

作者： Juan Zhou Yanzhong Zhu Wenqian Cai Kuixuan Lin Yu Wang Lusan Liu Chinese Research Academy of Environmental Sciences Technical Centre Soil Agriculture and Rural Ecology and Environment Ministry of Ecology and Environment

During the past few decades, there has been an increase in the number of coastal land reclamation projects for residential, commercial and industrial purposes in more and more coastal cities of China, which led to the destruction of the wetlands and loss of the sensitive marine habitats. Meanwhile, the influences and nature of these projects attract widespread public and academic concern. For identifying the trend of landscape(esp. coastal reclamation) and ecological environment changes, understanding of which interacted, and offering a general science for development of regional plans. In paper, a case study was carried out in Bohai Bay area, based on the analysis of remote sensing data. Landuse maps were created for 1954, 1970,1981, 1990, 2000 and 2010. Landscape metrics were calculated and illustrated that the degree of reclamation changes were linked to the hydrodynamic environment and macrobenthos community. The results indicated that the worst of the loss of initial areas occurred during 1954-1970, with 65.6% lost mostly to salt field;to 2010, coastal reclamation area increased more than 200 km as artificial landscape. In Bohai Bay, for one thing, the numerical simulation of tidal current field in 2003 and 2010 respectively showed that the flow velocity in offshore became faster(from 2-5 cm/s to 10-20 cm/s), the flow direction seem to go astray and it was not conducive to the spread of pollutants and degradation due to the significant changes of coastline;For another, the analysis of the dominant macobenthos from 1958 to 2012 showed that Musculus senhousei(Benson, 1842) as a disturbance tolerant species spread very fast and had been the predominant species in the recent years.

关键词： System simulation coastal reclamation Landscape metrics Spatial patterns Hydrodynamic environment

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