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Changes of coastline and tidal flat and its implication for ecological protection under human activities: Take China’s Bohai Bay as an example

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China Geology 2024年第1期7卷 26-35页

作者： Yong Li Ming-zheng Wen Heng Yu Peng Yang Fei-cui Wang Fu Wang Tianjin Center China Geological SurveyMinistry of Natural ResourcesTianjin 300170China Key Laboratory of Coast Geo-environment China Geological SurveyMinistry of Natural ResourcesTianjin 300170China Tianjin Key Laboratory of Coast Geological Processes and Environmental Safety Tianjin 300170China Hebei University of Environmental Engineering Qinhuangdao 066102China Hebei Engineering Research Center for Ecological Restoration of seaward Rivers and Coastal Waters Qinhuangdao 066102China Department of Earth and Environment Boston UniversityBoston 02215USA

The change processes and trends of shoreline and tidal flat forced by human activities are essential issues for the sustainability of coastal area,which is also of great significance for understanding coastal ecological environment changes and even global *** on field measurements,combined with Linear Regression(LR)model and Inverse Distance Weighing(IDW)method,this paper presents detailed analysis on the change history and trend of the shoreline and tidal flat in Bohai *** shoreline faces a high erosion chance under the action of natural factors,while the tidal flat faces a different erosion and deposition patterns in Bohai Bay due to the impact of human *** implication of change rule for ecological protection and recovery is also *** should be taken to protect the coastal ecological *** models used in this paper show a high correlation coefficient between observed and modeling data,which means that this method can be used to predict the changing trend of shoreline and tidal *** research results of present study can provide scientific supports for future coastal protection and management.

关键词： Shoreline tidal flat Erosion deposition patterns Changing trend Ecological protection Human activity Linear regression model Inverse distance weighing method Prediction Bohai Bay

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Historical trends in the anthropogenic heavy metal levels in the tidal flat sediments of Lianyungang, China

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Journal of Environmental Sciences 2013年第7期25卷 1458-1468页

作者： Rui Zhang Fan Zhang Yingjun Ding Jinrong Gao Jing Chen Li Zhou School of Geodesy and Geomatics Engineering Huaihai Institute of Technology State Key Laboratory of Pollution Control and Resources Reuse Nanjing University Jiangsu Marine Resources Development Research Institute Huaihai Institute of Technology

The sedimentation of metals can preserve the historical record of contaminant input from local and regional sources and provide information on the historical changes in regionalwater and sediment quality. We report the 210Pb activities and the heavy metal （Cd, Cr, Cu, Mn, Pb and Zn）depth profiles from sediment cores retrieved in 2010. The mean sedimentation rates of 0.85-1.5 cm/yr aredetermined by 210 Pbdating. The sediments in the tidal flat have recorded heavy metaldeposition and thus allow the establishment of a connection between the temporal evolution of the heavy metal pollution and the historical changes in the economicdevelopment of Lianyungang. The enrichment factors （EF） are calculated to estimate the level of contamination stored in these sediments. The results show that in the studied sites, Cr and Cudisplay low EF values and are mainly from lithogenic origin. For the other studied trace metals, a great variability in the sedimentary record is observed. Significant anthropogenic enrichment over the last 50 years is revealed at the tidal flat that receives fluvial inputs. Zinc is the elementwith the highest EF values, followed by the order of Pb 〉 Cd 〉 Mn 〉 Cu and Cr. The temporal variations of the heavy metals peakduring the late 1980s to the early2000s and show adecreasing trend afterward. The pollution intensity of the tidal flat isdetermined by using EF and thegeo-accumulation index （Igeo ）,which show that, based on the Igeo scale, the tidal flat of Haizhou Bay is unpolluted to moderately polluted.

关键词： sediment rates heavy metals pollution anthropogenic input tidal flat

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The Effects of Farmyard Manure and Mulch on Soil Physical Properties in a Reclaimed Coastal tidal flat Salt-Affected Soil

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Journal of Integrative Agriculture 2014年第8期13卷 1782-1790页

作者： ZHANG Jian-bing YANG Jing-song YAO Rong-jiang YU Shi-peng LI Fu-rong HOU Xiao-jing State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences Dongtai Institute of tidal flat Nanjing Branch of the Chinese Academy of Sciences

Careful soil management is important for the soil quality and productivity improvement of the reclaimed coastal tidal flat saline land in northern Jiangsu Province, China. Farmyard manure（ FYM） and mulch applications, which affect soil characteristics and plant significantly, are regard as an effective pattern of saline land improvement. As a conventional management in the study region, FYM and mulch are used for the amendment of the new reclaimed tidal flat regularly, but little is known about their effects on soil physical properties functioning. A study was conducted on a typical coastal tidal flat saline land, which was reclaimed in 2005, to evaluate the effects of FYM, polyethylene film mulch（PM）, straw mulch（SM）, FYM combined with PM（FYM＋PM）, FYM combined with SM（FYM＋SM）, on soil hydraulic properties and soil mechanical impedance. CK represented conventional cultivation in study area without FYM and mulch application and served as a control. The experiment, laid out in a randomized complete block design with three replications, was studied in Huanghaiyuan Farm, which specialized in the agricultural utilization for coastal tidal flat. Result showed that capillary water holding capacity（CHC）, saturated water content（SWC）, saturated hydraulic conductivity（ Ks） and bulk density（BD）, cone index（CI） were affected significantly by the FYM and mulch application, especially in the 0-10 cm soil layer. FYM and mulch management increased CHC, SWC and Ks over all soil depth in the order of FYM＋SM〉FYM＋PM〉FYM〉SM〉PM〉CK. With the contrary sequence, BD and CI decreased significantly; however, FYM and mulch application affected BD and CI only in the upper soil layers. CHC, SWC and Ks decreased significantly with the increasing of soil depth, BD and CI, and a significant liner equation was found between CHC, SWC, Ks and BD, CI. With the highest CHC（38.15%）, SWC（39.55%）, Ks（6.00 mm h-1） and the lowest BD（1.26 g cm-3） and CI（2.71 MPa）, the combined management of FYM and SM was reco

关键词： farmyard manure mulch hydraulic property soil mechanical impedance tidal flat northern Jiangsu Province

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Impact of Human Activities on Depositional Process of tidal flat in Quanzhou Bay of China

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Chinese Geographical Science 2007年第3期17卷 265-269页

作者： Wang Aijun Open Laboratry of Ocean Coast Environmental Geology Third Institute of Oceanography State Oceanic Administration Xiamen 361005 China

As a very important component of a coastal system, tidal flats come to be a focus of the studies on land-ocean interaction in the coastal zone because those areas are subjected to intense human activities and are highly sensitive to the global change. The Quanzhou Bay, located along the middle part of Fujian coast of China, covers about 136.4km^2, and the area of coastal wetland in the entire bay from intertidal to subtidal with 6m of water depth accounts for 96% of the total area. Seven short cores were collected and divided in situ with the interval of 5cm on the coastal wetlands of Quanzhou Bay on April 19, 2006. The sediment samples were scattered and the grain sizes were measured by using Mastersizer 2000. Human beings＇ activities on tidal fiat have disturbed the vertical distribution of sediments in stratigraphic sequence and accelerated the sedimentation rates. Grain size analysis results show that the grain size diameters increase and sediment becomes worse sorted towards the sea under the strong human disturbance; Spartina alterniflora can play a role of trapping the fine sediment; but near the bank, the sediment becomes coarse and there are two peak values on frequency curve influenced by the sandpile. The trough formed by human activities along the coastline changes the transport path of water and suspended sediment. The sediments are transported through the trough and deposit in it during the flood; the ebb flow is retarded by the flow output through the adjacent trough, and the deposited sediment can not be re-suspended; then, the sedimentation rate increases. In situ observation show that the sedimentation rate is about 8-10cm/yr.

关键词： tidal flat sediment grain size human activities sedimentation rate Quanzhou Bay

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Bioelectricity generation and remediation of sulfide contaminated tidal flat sediment

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International Journal of Sediment Research 2020年第1期35卷 91-96页

作者： M.Azizul Moqsud Department of Civil and Environmental Engineering University of California

A dramatic decrease in the catch of shellfish has been observed due to the high amount of Acid Volatile Sulfide(AVS) in the tidal flats in *** the current study,an evaluation of simultaneous bioelectricity generation and remediation of sulfide contaminated tidal flat sediment has been *** sediment samples collected from Tokyo Bay and Yamaguchi Bay,Japan,have been used in the laboratory test.A 2 L cylindrical shaped Sediment Microbial Fuel Cell(SMFC) has been used to evaluate the remediation of both sediment samples in the *** different electrode materials carbon felt,carbon fiber and bamboo charcoal were used in the experiments to compare their efficiency to reduce the AVS from the sediment and generate *** was observed that the AVS reduction was higher at 5 cm depths for the Tokyo Bay sediment(100%) compared to the Yamaguchi Bay sediment(60%).The larger grain size for the Tokyo Bay sediment was the probable reason for *** maximum voltage was around 100 and80 mV for Tokyo Bay and Yamaguchi Bay,respectively.

关键词： Acid volatile sulfide Bioelectricity Remediation tidal flat Sediment microbial fuel cell Sediment

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Acid Volatile Sulfide and Simultaneously Extracted Metals in tidal flat Sediments of Jiaozhou Bay, China

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Journal of Ocean University of China 2007年第2期6卷 137-142页

作者： ZHANG Xiangshang ZHANG Longjun Key Laboratory of Marine Environmental Science and Ecology Ministry of EducationOcean University of China Qingdao 266100 P. R. China

It is well known that acid-volatile sulfide (AVS) plays an important role in influencing the toxicity of divalent cationic metals within anoxic sediments. In studying sediment core samples collected from tidal flats within the Jiaozhou Bay, China, we found that the AVS concentration gradually increases with depth and decreases from high tidal flat to low tidal flat areas. We evaluated the chemical activity and bioavailability of heavy metals in the tidal flat based on the molar ratio of simultaneously ex- tracted metals (SEM) and AVS. The value of SEM/AVS is generally less than 1 in this area except for the surface layer, which suggests that the heavy metals only have chemical activity in the surface layer. SEM is most highly concentrated at the boundary of the redox layer. SEM have similar depth distributions throughout the tidal flat. The aeration of low tidal flat sediment indicates that SEM gradually move to deeper sites via interstitial water.

关键词： Jiaozhou Bay tidal flat acid volatile sulfide heavy metal

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Influence of Seawall Line Choice on Tide Lock Drainage in tidal flat Inning——Cangdongpian Inning Area on the west part of Tiaozini Sand as a case study

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Marine Science Bulletin 2007年第1期9卷 55-65页

作者：李加林王艳红张忍顺宁波大学人民环境研究所浙江宁波315211 南京水利科学研究院河流海岸研究所江苏南京210024 南京师范大学海洋与滩涂研究所江苏南京210097

Most of the flood from the wide inner lowland plain discharges through tide locks on coast, and the influence of tidal flat inning projects on the tide lock drainage must be solved by seawall line choice. Taking the Cangdongpian inning area on the west side of Tiaozini Sand as a case study, the paper analyzed the compages and validity of ebb tide water to maintain the flood discharge creek below the tide lock for different projects of seawall line. Result indicates that a rational seawall line program has little influence on the flood discharge of lock during the mean tide or general spring tides, but has certain influences during a storm surge or an extreme spring tide in autumn. However it could be resolved by several times of artificial scour on the creek.

关键词： tidal flat inning tide lock discharge influence

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Distribution of benthic macrofaunal communities in intertidal flat under hydrodynamic influence:a case study of Jiangsu coast,East China

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Journal of Oceanology and Limnology 2023年第3期41卷 1024-1038页

作者： Longhui ZHANG Dezhi CHEN Shu GAO Yaping WANG Benwei SHI Yongfen DU School of Geography and Ocean Science Nanjing UniversityNanjing 210023China State Key Laboratory of Estuarine and Coastal Research East China Normal UniversityShanghai 200241China School of Marine Science and Engineering Nanjing Normal UniversityNanjing 210046China

To identify the distribution pattern of macrofaunal assemblages of the Dafeng intertidal flats in response to hydrodynamic and sediment dynamic processes in the northern Jiangsu coast,East China,macrofauna sampling and hydrodynamic observations were carried out simultaneously across the mud flat,mixed mud-sand flat,and silt-sand flat of the intertidal zone in June *** show that there was a clear zonal distribution pattern of the macrofaunal communities,as is controlled by local hydrological and sedimentary *** component analysis(PCA)revealed three types of intertidal area in terms of hydrological and surficial sediment ***,three distinct groups of the macrofaunal communities,i.e.,mud flat,mix mud-sand,and silt-sand groups,were recognized at similarity level of 24%based on the CLUSTER analysis in similarity profile(SIMPROF)*** analysis upon best variables stepwise search(BVSTEP)indicated the importance of the hydrodynamics(e.g.,water temperature and salinity,tidal duration,flow speed,suspended sediment concentration,and wave height)in the differentiation of macrofaunal communities with different taxonomic classes over the intertidal ***,macrofaunal assemblages,similar to hydrology and surficial sediment,have a unique zonation ***-sized deposit feeders adapt better to low energy environments,thus dominated the upper part of the intertidal flat,whilst the heavy and large-sized filter feeders and deposit feeders were dominant over the middle and lower *** hydrodynamic and sediment processes cause biota-niche separation,which affected the biological processes across the intertidal flat.

关键词： macrofaunal communities hydrodynamic process inter-tidal ecosystem sedimentation tidal flat Jiangsu coast

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Relative importance of tidal flats and artificial habitats for two spoonbill species and related interspecific differences

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Avian Research 2023年第3期14卷 317-325页

作者： Takehiko Shimizu Masayuki Senzaki Yuichiro Fujioka Satoquo Seino School of Interdisciplinary Science and Innovation Kyushu UniversityMotooka 744Nishi-kuFukuoka819-0395Japan Graduate School of Environmental Science Hokkaido UniversityKita 10-jo Nishi 5-chome Kita-kuSapporoHokkaido060-0810Japan Faculty of Environmental Earth Science Hokkaido UniversityKita 10-jo Nishi 5-chome Kita-kuSapporoHokkaido060-0810Japan Faculty of Social and Cultural Studies Kyushu UniversityMotooka 744Nishi-kuFukuoka819-0395Japan Faculty of Engineering Kyushu UniversityMotooka 744Nishi-kuFukuoka819-0395Japan

Artificial/seminatural environments,such as aquacultural ponds,saltpans,and croplands,have recently been acknowledged as important habitats for coastal *** coastal waterbirds tend to use artificial habitats around tidal flats as roosting sites during high-tide,it remains unclear whether the importance of surrounding habitats relative to tidal flats varies among landscape types,seasons,species,or tidal *** Black-faced Spoonbill(Platalea minor)and Eurasian Spoonbill(***)are two closely related sympatric species in East Asia with narrow and wide distribution ranges and habitat requirements,*** therefore expect that both species will use surrounding artificial habitats across seasons at high tides,but Blackfaced Spoonbills will use them less frequently than Eurasian ***,we address these hypotheses in the Imazu tidal flat and its surrounding environments in southern *** investigated the habitat use and behavioral patterns of both species through route and behavioral surveys during the fall migration and wintering seasons in *** found that both species used surrounding habitats including artificial ones more frequently than the tidal flat regardless of the tidal condition or season,but spoonbills used these habitats more frequently in winter than in *** also found that Eurasian Spoonbills foraged in surrounding artificial habitats more frequently than Black-faced *** results not only demonstrate how coastal waterbirds exploit surrounding habitats relative to tidal flats but also suggest that the importance of surrounding habitats varies among species and *** study thus emphasizes that valuing and managing surrounding habitats in addition to tidal flats are key to conserving globally declining waterbirds.

关键词： Artificial habitat Behavior Black-faced Spoonbill Eurasian Spoonbill Habitat use Surrounding environment Species distribution model tidal flat

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Numerical tidal Current Modeling Using Fine Boundary-Fitted Grids for tidal flats

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China Ocean Engineering 1999年第2期14卷 115-124页

作者： Shi, FY Ding, PX Kong, YZ E China Normal Univ State Key Lab Estuarine & Coastal Res Shanghai 200062 Peoples R China

Fine grids with small spacing in boundary-fitted coordinates are normally used to treat the computation of fluid dynamics for estuarine areas and tidal flats. However, the adoption of Cartesian components of velocity vectors in this kind of non-orthogonal coordinates will definitely result in a difficulty in solving implicitly the transformed momentum equations, and also complicate the wet-dry point judgement used for flood areas. To solve this problem, equations in terms of generalized contravariant velocity vectors in curvilinear coordinates are derived in the present study, by virtue of which, an Alternative-Direction-Implicit numerical scheme in non-orthogonal grids would then be easily obtained, and wet-dry point judgement would as well be largely simplified. A comparison is made between the explicit scheme and implicit scheme, showing that the present model is accurate and numerically stable for computations of fluid dynamics for estuarine areas and tidal flats.

关键词： tidal flat estuary boundary-fitted grid tidal current numerical model

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