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Sources of sediment in tidal flats off Zhejiang coast,southeast China

Journal of Oceanology and Limnology 2021年第4期39卷 1245-1255页

作者： Jia JIA Xingze ZHANG Ruhui ZHOU Michael MEADOWS dhritiraj sengupta Lidong ZHU College of Geography and Environmental Science Zhejiang Normal UniversityJinhua 321004China Department of Environmental&Geographical Science University of Cape TownRondebosch 7701South Africa Key Laboratory of Geographic Information Science Ministry of Educationand School of Geographic SciencesEast China Normal UniversityShanghai 200241China

The growth of tidal flats off Zhejiang coasts in southwestern China has provided substantial areas for local agriculture and construction *** evaluate modern and future development of tidal flats in the region,a good understanding of sediment sources is *** research has concluded that the Changjiang(Yangtze)River is the dominant supplier of sediments to this part of the southeast Chinese coast,despite the fact that sediment delivery from this source has been decreased markedly in the past two *** this study,we investigated the sources of tidal flat sediments,and the magnetic and geochemical properties of recent tidal flat sediments along the Zhejiang coast were compared with those discharged from *** and geochemical properties of the tidal flat samples reveal statistically distinct sediment provenance *** magnetic and geochemical scatter plots show that the suspended sediment samples are naturally divided into two different groups,one including the Changjiang River and Qiantang River material,and the other including the Jiaojiang,Oujiang,and Feiyun Rivers that located in the central and southern parts of the study *** last,a binary source of tidal flat sediments along the Zhejiang coast was determined,with the substantial majority originating from local rivers,while a much smaller proportion emanates from the Changjiang River to the *** conclude that the sediment contribution of the Changjiang River to tidal flat development in the region has been markedly overestimated,with important implications for management.

关键词： tidal flats Zhejiang coastal area magnetic and geochemical characteristics sediment source tracing

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Vegetation dynamics in response to human and climatic factors in the Tanzanian Coast

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Frontiers of Earth Science 2021年第3期15卷 595-605页

作者： Herrieth MACHIWA Bo TIAN dhritiraj sengupta Qian CHEN Michael MEADOWS Yunxuan ZHOU State Key Laboratory of Estuarine and Coastal Research East China Normal UniversityShanghai 200241China University of Dar es Salaam College of Information and Communication TechnologiesDepartment of Computer Science and EngineeringDar es Salaam 33335Tanzania Key Laboratory of Geographic Information Science(Ministry of Education) School of Geographical SciencesEast China Normal UniversityShanghai 200241China Department of Environmental&Geographical Sciences University of Cape TownRondebosch 7701South Africa College of Geography and Environmental Sciences Zhejiang Normal UniversityJinhua 321004China

This study of vegetation dynamics in the coastal region of Tanzania provides a fundamental basis to better understand the nature of the factors that underlie observed *** Tanzanian coast,rich in biodiversity,is economically and environmentally important although the understanding of the nature and causes of vegetation change is very *** paper presents an investigation of the relationship between vegetation dynamics in response to climate variations and human activities using Moderate Resolution Imaging Spectro-radiometer(MODIS),Normalized Difference Vegetation Index(NDVI),meteorological,and Globeland30 Landsat data ***-temporal trends and the relationship of NDVI to selected meteorological variables were statistically analyzed for the period 2000-2018 using the Mann-Kendall test and Pearson correlation *** results reveal a significant positive trend in temperature(/?>0,Z=2.87)and a non-significant trend in precipitation(|Z|<1.96).A positive relationship between NDVI and precipitation is *** Tanzania has therefore experienced increased temperatures and variable moisture conditions which threaten natural vegetation and ecosystems at *** land cover maps obtained from GlobeLand30 were analyzed to identify the nature and scale of human impact on the *** analysis of land use and land cover in the region reveals an increase in cultivated land,shrubland,grassland,built-up land and bare land,while forests,wetland and water all decreased between 2000 and *** decrease in forest vegetation is attributable to the fact that most livelihoods in the region are dependent on agriculture and harvesting of forest products(firewood,timber,charcoal).The findings of this study highlight the need for appropriate land-use planning and sustainable utilization of forest resources.

关键词： remote sensing NDVI climate variations spatio-temporal changes LULCC coastal Tanzania

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