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Near-bed sediment transport in a heavily modified coastal plain estuary

International Journal of Sediment Research 2014年第2期29卷 232-245页

作者： Gao-feng LIU Jia-xue WU Yuan-ye WANG Shanghai Estuarine and Coastal Science Research Center The Center for Coastal Ocean Science and Technology Research School of Marine SciencesSun Yat-sen University

Numerous estuaries of the world have been strongly modified by human *** interferences can make great adjustments of not only sediment transport processes,but also the collective behavior of the *** paper provides a typical case of a heavily modified coastal plain estuary of Sheyang on the China coast,where a sluice barrage was built in 1956 to stop the intrusions of storm surges and saline *** sets of instrumented tripods were simultaneously deployed along a cross-shore transect to continuously observe near-bed flow currents and sediment *** in-situ surveys lasted over a spring and neap tide cycle when a strong wind event occurred in the neap *** of flows and sediment transport between tide-dominated and wind-dominated conditions demonstrated the important role of episodic wind events in flows and sediment *** wind-induced currents,bottom stresses,and sediment transport rates were significantly greater when wind was present than corresponding quantities induced by the *** long-shore sediment transport induced by winds exceeds the cross-shore component,especially near the river mouth *** results indicate the noticeable importance of wave-dominated coastal processes in shaping topographic features.A regime shift of estuarine evolution under highly intense human forcing occurs from fluvial to marine *** finding suggests that the management strategy of the estuarine system should focus on the restoration of estuarine processes,rather than the present focus on inhibition of marine dynamics.

关键词： Estuarine dynamics Sediment transport Strong wind event anthropogenic effects

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Impact of human disturbances on soil cyanobacteria diversity and distribution in suburban arid area of Marrakesh, Morocco

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Ecological Processes 2021年第1期10卷 563-578页

作者： Z.Hakkoum F.Minaoui M.Douma K.Mouhri M.Loudiki Laboratory of Water Biodiversity and Climate Change Phycology Biotechnology and Environmental Toxicology Research UnitFaculty of Sciences Semlalia MarrakeshCadi Ayyad UniversityAv.Prince My AbdellahP.O.Box 239040000 MarrakeshMorocco

Background:Cyanobacteria are among the first photoautotrophic component of soil microorganism communities which play a key ecological role in nutrient cycles and soil ***,the sustainability of these soil biodiversity ecosystem services is increasingly compromised,especially in urban and peri-urban areas where soils are heavily exploited and used for a wide range of human *** aim of this study is to assess the impact of different types of human disturbances on cyanobacteria diversity and distribution in suburban soils of *** and cyanobacteria sampling were carried out during two campaigns at six sites located along an anthropogenic gradient from the least urbanized suburbs of Marrakesh to the highly anthropized suburban *** the laboratory,soil physicochemical characteristics were *** morphological identification of cyanobacteria species was based both on microscopic observation and on soil cultures in solid and liquid Z8 ***:The results showed a total of 25 cyanobacteria taxa belonging to ten genera,four families,and two orders(Oscillatoriales 88%and Chroococcales 12%of taxa).Among the taxa identified,seven strains were isolated in soil culture in nutrient media and purified in monoalgal *** highest cyanobacterial diversity was recorded in irrigated soil with treated wastewater compared to the non-cultivated control *** Principal Component and Cluster Analysis,suburban soils were subdivided into three groups depending on the chemical properties and cyanobacteria *** diversity was significantly associated with the soil moisture,total organic carbon(TOC),PO_(4)^(-)P,NO_(3)^(-)N,and NH_(4)^(-)N ***:While diversity and microalgal biomass were significantly lower in the soils affected by municipal and mining solid wastes,the input of organic matter and nutrients from treated wastewater appears to be beneficial for the increasing of the biodiversity of soil cyan

关键词： Cyanobacteria Peri-urban soils Pollution anthropogenic effects Moroccan drylands

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Distribution and sources of heavy metals in the sediment of Xiangshan Bay

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Acta Oceanologica Sinica 2014年第4期33卷 101-107页

作者： SUN Weiping YU Jianjun XU Xiaoqun ZHANG Weiyan LIU Ruijuan PAN Jianming Zhejiang University The Second Institute of Oceanography State Oceanic Administration Nanyang Technological University Key Laboratory of Submarine Geosciences State Oceanic Administration

Heavy metals in the surface sediments and sediment core from the Xiangshan Bay, a mariculture base on the coast of the East China Sea, were determined by inductively coupled plasma mass spectrometry（ICP–MS） in order to evaluate their levels and sources. The results showed that the levels of Cu, Pb, Zn, and Cr in the sediments of the bay have been generally influenced by anthropogenic inputs since the founding of the People’s Republic of China. In particular, Cu and Zn were polluted to some extent, as evidenced by high enrichment factors. Organic matter, grain size, wastewater discharge, and low energy hydrodynamic environment played dominant roles in the heavy metal enrichment in the sediments. The ratio of terrigenous source to marine biogenic deposit of trace metals in the sediments was calculated, revealing that terrigenous inputs were the main source of Cu, Pb, and Zn, while biological pellets contributed much more to the enrichment of Cr and Cd. Considering the influence of biological sources on the enrichment of Cd and Cr, and the fact that the sediment has been polluted by Cu and Zn, the development of mariculture and discharge of wastewater into the Bay should be restricted

关键词： anthropogenic effects biogenic deposits heavy metals sediments enrichment facto

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