Eisma d (28 risultati)

Condizione: gut. Abb., 23 cm, Ecke geknickt, Einband leicht fleckig. Besitzvermerk. Sprache: Englisch.

18pp, 11 figs, Printed Card Cover, VGC.

Concentration distributions of heavy metals and polycyclic aromatic hydrocarbons (PAHs) were determined in sediments taken in the Oyster Grounds. Average concentrations in fine fraction (<63 ?m) of the sediments of Cd, Cu, Hg, Pb, and Zn were 0.14, 21.8, 0.23, 49.2, and 118 ?g g?1, respectively. Average ?PAH concentration was 1.82 ?g g?1. Vertical gradients within the sediment cores varied for all compounds and did not exhibit any one particular trend, probably because of bioturbation and extensive fishery in this highly productive area. A highly significant north to south trend appeared for Cd: average values increased from 0.06 ?g g?1 in the northern part to 0.42 ?g g?1 in the southern. Most of the PAHs showed an opposite gradient: average ?PAH values decreased from 2.53 ?g g?1 in the north to 1.24 ?g g?1 in the southern part of the Oyster Grounds. Heavy-metal levels in Oyster Ground sediments were 5 to 10 times lower than in other North Sea sedimentation areas (e.g. the Wadden Sea and the German Bight) and in the river Rhine. The yearly sediment deposition in the muddy part of the Oyster Grounds was used to calculate the yearly load of the various heavy metals and PAHs. It was estimated that less than 0.03 to 0.3% of the total heavy-metal input to the North Sea reaches the sediments of the Oyster Grounds. 5 pp., 4 figs, gr. 8. …

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Condizione: New. pp. 258 1st Edition.

Gebunden. Condizione: New. The Editor is retired professor in Marine Sedimentology (University of Utrecht & Netherlands Institute for Sea Research, Texel, The Netherlands) with a wide experience in coastal research. The Editor authored more than 200 research papers and seven books on.

Condizione: New. pp. 258.

Buch. Condizione: Neu. Neuware - The varied use of dredgers has led to the development of a variety of dredger types, from small ones appropriate to modest inshore projects, to very large sea-going dredgers for large-scale projects calling for the storage of dredged material within the ship. This book, which is the first book dedicated to dredging and its environmental impact in the widest sense, contains chapters on dredging operations in the Netherlands, Belgium, the UK, Spain, the US, China and Singapore. Additional chapters discuss more general aspects such as dredging techniques, monitoring of dredging operations, and the prospects of dredging in a changing environment. As well as providing information on dredging activities in different areas, it gives an insight into the activities and problems (environmental or other) involved in modern dredging. It will be of interest to professionals and students alike.…

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Condizione: Hervorragend. Zustand: Hervorragend | Sprache: Niederländisch | Produktart: Bücher | Keine Beschreibung verfügbar.

Condizione: Sehr gut. Zustand: Sehr gut | Sprache: Niederländisch | Produktart: Bücher | Keine Beschreibung verfügbar.

Condizione: New. pp. 258 This item is printed on demand.