Latest on Coastal Sediment Research: Oct – 2019

Temperature dependence of aerobic respiration in a coastal sediment

The direct temperature dependence of aerobic respiration made up our minds in sediment from urban center Bay, Denmark, in incubations shorter than twelve h at temperature intervals of one.7°C. element consumption showed a bimodal distribution between −2 and 80°C indicating the presence of distinct non-thermophilic and thermophilic populations. The thermophilic element consumption had minimum, optimum, and most temperatures of forty, 55, and 65°C, severally, and accelerated powerfully once a lag section of 2–3 h, which can result to associate degree activation of spores. The supply of this dormant thermophilic population is unknown. element consumption by the non-thermophilic population had minimum and most temperatures of  [1]

Sulfur and iron cycling in a coastal sediment: Radiotracer studies and seasonal dynamics

The seasonal variation in salt reduction ana the dynamics or sulfur ana iron chemistry were studied throughout a year in sediment of city Bay, Denmark. A radiotracer methodology for activity salt reduction rates was applied with incubation times all the way down to fifteen min and a depth resolution down to two metric linear unit within the change surface layer of the sediment. The radiotracer information were analyzed by a mathematical model that showed that, thanks to partial, speedy reoxidation of hot sulphide throughout incubation, the particular reduction rates during this layer were most likely underestimated 5-fold. within the deeper, sulfidic zone, measured rates gave the impression to be correct. salt reduction followed the seasonal variation in temperature with most activity at 1–2 cm depth in late summer. [2]

Polycyclic aromatic hydrocarbon (PAH)-phase associations in Washington coastal sediment

Polycyclic aromatic (PAH) and acyclic  organic compound compositions, organic carbon, element and polymer contents were determined in whole, unfractionated sediment from the Washington Davy Jones’s locker and in separate sediment fractions separated by particle size and density. a minimum of twenty to twenty fifth of perylene and PAH derived from transmutation processes and five hundredth of the retene measured in whole sediment are contained at intervals organic C- and lignin-rich panicles of density ≤ one.9 g/cc. These particles, that embody primarily plant remains and bits of charcoal, comprise but I Chronicles of the overall sediment weight. In distinction, a series of alkyl group phenanthrene homologs, presumably of fossil origin, are targeted in some element of the additional dense, lithic matrix of the sediment. [3]

World’s largest dam removal reverses coastal erosion

Coastal erosion outpaces land generation on several of the world’s deltas and a big share of shorelines, and human-caused alterations to coastal sediment budgets is necessary drivers of this erosion. For sediment-starved and erosion-prone coasts, large-scale improvement of sediment provide is also a very important, however poorly understood, management possibility. Here we offer new topographical measurements that show patterns and trends of beach accretion following the restoration of sediment provide from a huge dam removal project. stream sediment was at the start deposited in intertidal-to-subtidal deltaic lobes, and this sediment was reworked by ocean waves into subaerial stream mouth bars over time scales of many months. [4]

Influence of Amenities in the Functioning of a Coastal Sediment Cell with a Moving Barrier: Case of Benin Coastal Segment between Hillacondji and Djondji in the Township of Grand Popo

The coast of Republic of Benin, one hundred twenty five kilometer long, is an element of the general west African coast, characterised by a slender strip of coarse and medium sand and by a vital coastal transit, that makes it associate basically fragile lineation. This coast conjointly suffers from a powerful anthropical pressure marked by the presence of port and building infrastructures furthermore because the body and personal buildings wich disturb matter dynamics of the lineation. The coastal sector between Hillacondji and Grand-Popo, that for a moment, is confronted to erosional phenomena of sandy band, that was the topic of the current study. [5]

Reference

[1] Thamdrup, B., Hansen, J.W. and Jørgensen, B.B., 1998. Temperature dependence of aerobic respiration in a coastal sediment. FEMS Microbiology Ecology, 25(2), (Web Link)

[2] Moeslundi, L., Thamdrup, B. and Jørgensen, B.B., 1994. Sulfur and iron cycling in a coastal sediment: radiotracer studies and seasonal dynamics. Biogeochemistry, 27(2), (Web Link)

[3] Prahl, F.G. and Carpenter, R., 1983. Polycyclic aromatic hydrocarbon (PAH)-phase associations in Washington coastal sediment. Geochimica et Cosmochimica Acta, 47(6), (Web Link)

[4] World’s largest dam removal reverses coastal erosion
Jonathan A. Warrick, Andrew W. Stevens, Ian M. Miller, Shawn R. Harrison, Andrew C. Ritchie & Guy Gelfenbaum
Scientific Reports volume 9, Article number: 13968 (2019) (Web Link)

[5] Djara Moussa, B., Laïbi Raoul, A. and Christophe, K. (2017) “Influence of Amenities in the Functioning of a Coastal Sediment Cell with a Moving Barrier: Case of Benin Coastal Segment between Hillacondji and Djondji in the Township of Grand Popo”, Journal of Geography, Environment and Earth Science International, 10(4), (Web Link)

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