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| Hudier, E; Ingram, G. |
| We present series of data describing the small-scale structure of the boundary layer stratification in the vicinity and away from a 1.5 m pressure ridge keel. We then analyze the influence of pressure ridges on the spatial and temporal variability of the ocean boundary layer Our experiment was done during the melt in order to use small-scale salinity gradients to study the variability in intensity of mixing processes. High-resolution salinity records sampled at 0+, 25 and 50 cm from the ice-water interface were analyzed at two stations, one at 5 m and the other at 75 m from a pressure ridge keel. We observed that, in the immediate vicinity of the ridge, melting is associated with the periodic development and dissipation of a melt layer in relation with the... |
| Tipo: Text |
Palavras-chave: Glace; Rugosité; Couche limite; Diffusion turbulente; Ice; Roughness; Boundary layer; Eddy diffusivity. |
| Ano: 1999 |
URL: http://archimer.ifremer.fr/doc/00325/43598/43981.pdf |
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| Bertin, Stephane; Friedrich, Heide. |
| Gravel riverbeds naturally present a range of sediment size that can span several orders of magnitude. However, fine sediment (i.e., size <2 mm) additions affect sediment transport and are potentially harmful to the river ecology. Limited research has been done to understand the effects of sand addition on gravel bed topography. For this study, we conducted flume experiments testing the effectiveness of topography remote sensing to measure the response of a water-worked gravel bed to varying sand additions and bed flushing. Repeated measurements of the bed topography with through-water photogrammetry show that sand deposits primarily in low-lying areas of the bed, where it is sheltered. Observed changes in bed elevation standard deviation, skewness, and... |
| Tipo: Text |
Palavras-chave: Gravel bed; Sand addition; Bed flushing; DEM; Roughness; Photogrammetry. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00637/74905/75969.pdf |
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| Melo,Mariana C.; Tavares,Laene F.; Oliveira,Thaísa F.; Silva,Rodrigo R.; Carvalho Filho,Alberto. |
| ABSTRACT: The effects of natural weathering and different managements performed in agriculture may best be understood by studying the soil roughness. The aim of this study was to evaluate the optimization of the use of pin microrelief meter, an instrument used to determine the soil surface roughness, as the number of readings collected over traditional methodology proposed in the bibliography. The study was conducted in Rio Paranaiba (MG), in a Haplustox soil. The experimental design was completely randomized in a 2×3 factorial design with four replications. There were combined two types of primary tillage: conventional tillage with disc plow (PCAD) and harrow (PCGA), and three amounts of readings (100, 200, and 300 reading points) sampled in each... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mobilization; Pin microrelief meter; Roughness; Soil tillage. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000501056 |
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