scholarly journals Wave refraction and longshore transport patterns along the southern Santa Catarina coast

2007 ◽  
Vol 55 (2) ◽  
pp. 109-120 ◽  
Author(s):  
Eduardo Siegle ◽  
Nils Edvin Asp
Keyword(s):  
Wave Climate ◽  
Transport Processes ◽  
Brazilian Coast ◽  
Santa Catarina ◽  
Wave Refraction ◽  
The North ◽  
Longshore Transport ◽  
Longshore Drift ◽  
Northern Portion ◽  
Transport Patterns

Based on the wave climate for the southern Brazilian coast, wave refraction has been modelled in order to obtain the refracted wave heights and directions along the southern Santa Catarina coast, providing the needed information for potential longshore drift estimates. According to its coastline orientation, different sectors of the coast present varying longshore drift patterns. Estimates have been made for the yearly-averaged wave climate as well as for each season, showing thereby the longshore drift patterns along the year. Based on the results of the potential longshore drift intensities and directions and on the shoreline outline in plan, it has been possible to identify a strongly drift-dominated coast in the south turning to a mixed drift and swash dominated coast towards the north of the studied area. Contrasting patterns of longshore drift between the southern and northern portion of the coastline indicate a sediment surplus in the central portion, making sediment available for cross-shore transport processes, either on- or offshore. Considering long-term aspects, the longshore drift patterns are in agreement with the coastal infilling process which has mainly been driven by persistent surplus from littoral sediment drift.

scholarly journals A significant longshore transport divergence zone at the Northeastern Brazilian coast: implications on coastal Quaternary evolution

2002 ◽  
Vol 74 (3) ◽  
pp. 505-518 ◽  
Author(s):  
ABÍLIO C.S.P. BITTENCOURT ◽  
LOUIS MARTIN ◽  
JOSÉ M.L. DOMINGUEZ ◽  
IRACEMA R. SILVA ◽  
DAIANA L. SOUSA
Keyword(s):  
Climate Model ◽  
Coastal Region ◽  
Wave Climate ◽  
Brazilian Coast ◽  
Wave Fronts ◽  
Longshore Transport ◽  
Longshore Drift ◽  
Significant Divergence ◽  
The Mean

By using the mean directions of the wave-fronts approaching the Brazilian northeastern coastal stretch comprised between the localities of Real river (Sergipe State) and Galinhos (Rio Grande do Norte State) - coincident with those of the main winds occurring in the area - and their periods, we have defined a wave climate model based on the construction of refraction diagrams. The resulting model of sediment transport, as obtained by numerical modelling from the refraction diagrams, taking into consideration the angle of approach and waves heights along the 10-m isobath, was capable of reproducing the patterns of sediment dispersion provided by geomorphic indicators of the longshore drift. All this coastal region, approximately 900 km in length, is characterized by a significant divergence zone in the direction of net longshore drift of sediments, the potential intensity of which increases considerably in value, in almost its entire length, continuously toward downdrift, which might explain the greater or lesser long term susceptibility to erosion, during the Quaternary, along the coastal stretch studied.

scholarly journals Polychaetes of the North-Central Santa Catarina state, Brazil

Check List ◽  
2012 ◽  
Vol 8 (2) ◽  
pp. 204 ◽  
Author(s):  
Tito Cesar Marques de Almeida ◽  
Jorge Matheus Vivan ◽  
Bruno Henrique Pesserl ◽  
Paulo Da Cunha Lana
Keyword(s):  
Distribution Range ◽  
Brazilian Coast ◽  
Santa Catarina ◽  
Inner Shelf ◽  
North Central ◽  
Polychaete Species ◽  
The North ◽  
Santa Catarina State

A preliminary checklist of polychaete species from the inner shelf of Santa Catarina state (S Brazil) is presented, based on material collected between 26°18’ S – 27°18’ S, in depths ranging from 5 to 15 m. The checklist comprises 46 species belonging to 18 families. Sigambra pettiboneae (Hartman-Schröeder, 1979) is newly reported for the Brazilian coast. Mediomastus californiensis Hartman, 1944, Ninoe brasiliensis Kinberg, 1865, Neanthes bruaca Lana and Sovierzoski, 1987 and Paraprionospio pinnata (Ehlers, 1901) occurred in all samples. The distribution range of 22 other species was extended to the Santa Catarina coast.

scholarly journals Description and distribution of the larvae of two species of Fistulariidae (Teleostei, Syngnathiformes) in the southeastern Brazil

2007 ◽  
Vol 7 (1) ◽  
pp. 101-104 ◽  
Author(s):  
Fernanda Bernardo Anacreto Gomes de Barros ◽  
Márcia Salustiano de Castro ◽  
Ana Cristina Teixeira Bonecker
Keyword(s):  
Maximum Depth ◽  
Southeastern Brazil ◽  
Brazilian Coast ◽  
The South ◽  
The North ◽  
Single Genus

Fistulariidae contains the single genus, Fistularia, with four species. Two of these species are recorded from Brazil: Fistularia petimba and F. tabacaria. This study describes larvae of these two species of Fistularia, recording their distribution along the southeastern Brazilian coast, which is limited in the north by Real River (12° S) and in the south by São Tomé Cape (22° S). Samples were collected using a bongo net with mesh apertures of 330 and 500 µm during three oceanographic cruises conducted on spring/98 (Central III), winter/99 (Bahia 1) and autumn/00 (Central IV). The net was towed obliquely and the maximum depth was 200 m. Larvae of F. petimba were the most abundant and most widely distributed within the study area, including the seamounts of the Vitória-Trindade Ridge. Larvae of F. tabacaria were recorded only between 14° S and 21° S.

scholarly journals Study of water storage variations at the Pantanal wetlands area from GRACE monthly mass grids

2019 ◽  
Vol 9 (1) ◽  
pp. 133-143
Author(s):  
Ayelen Pereira ◽  
Cecilia Cornero ◽  
Ana C. O. C. Matos ◽  
M. Cristina Pacino ◽  
Denizar Blitzkow
Keyword(s):  
Water Mass ◽  
Spatial Scales ◽  
Water Storage ◽  
Transport Processes ◽  
Satellite Gravity ◽  
The North ◽  
Paraguay River ◽  
Gravity Recovery ◽  
Grace Mission ◽  
Phase Differences

Abstract The continental water storage is significantly in-fluenced by wetlands, which are highly affected by climate change and anthropogenic influences. The Pantanal, located in the Paraguay river basin, is one of the world’s largest and most important wetlands because of the environmental biodiversity that represents. The satellite gravity mission GRACE (Gravity Recovery And Climate Experiment) provided until 2017 time-variable Earth’s gravity field models that reflected the variations due to mass transport processes-like continental water storage changes-which allowed to study environments such as wetlands, at large spatial scales. The water storage variations for the period 2002-2016, by using monthly land water mass grids of Total Water Storage (TWS) derived from GRACE solutions, were evaluated in the Pantanal area. The capability of the GRACE mission for monitoring this particular environment is analyzed, and the comparison of the water mass changes with rainfall and hydrometric heights data at different stations distributed over the Pantanal region was carried out. Additionally, the correlation between the TWS and river gauge measurements, and the phase differences for these variables, were also evaluated. Results show two distinct zones: high correlations and low phase shifts at the north, and smaller correlation values and consequently significant phase differences towards the south. This situation is mainly related to the hydrogeological domains of the area.

scholarly journals Joint Modelling of Wave Energy Flux and Wave Direction

Processes ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 460
Author(s):  
Takvor H. Soukissian ◽  
Flora E. Karathanasi
Keyword(s):  
Energy Flux ◽  
Wave Energy ◽  
Goodness Of Fit ◽  
North Atlantic Ocean ◽  
Wave Climate ◽  
Western Mediterranean ◽  
Wave Direction ◽  
Bivariate Model ◽  
The North ◽  
Wave Energy Flux

In the context of wave resource assessment, the description of wave climate is usually confined to significant wave height and energy period. However, the accurate joint description of both linear and directional wave energy characteristics is essential for the proper and detailed optimization of wave energy converters. In this work, the joint probabilistic description of wave energy flux and wave direction is performed and evaluated. Parametric univariate models are implemented for the description of wave energy flux and wave direction. For wave energy flux, conventional, and mixture distributions are examined while for wave direction proven and efficient finite mixtures of von Mises distributions are used. The bivariate modelling is based on the implementation of the Johnson–Wehrly model. The examined models are applied on long-term measured wave data at three offshore locations in Greece and hindcast numerical wave model data at three locations in the western Mediterranean, the North Sea, and the North Atlantic Ocean. A global criterion that combines five individual goodness-of-fit criteria into a single expression is used to evaluate the performance of bivariate models. From the optimum bivariate model, the expected wave energy flux as function of wave direction and the distribution of wave energy flux for the mean and most probable wave directions are also obtained.

scholarly journals Dynamical Downscaling of ERA5 Data on the North-Western Mediterranean Sea: From Atmosphere to High-Resolution Coastal Wave Climate

2021 ◽  
Vol 9 (2) ◽  
pp. 208
Author(s):  
Valentina Vannucchi ◽  
Stefano Taddei ◽  
Valerio Capecchi ◽  
Michele Bendoni ◽  
Carlo Brandini
Keyword(s):  
Mediterranean Sea ◽  
Wind Wave ◽  
Dynamical Downscaling ◽  
Wave Climate ◽  
Western Mediterranean ◽  
Limited Area ◽  
Computational Domain ◽  
Wave Hindcast ◽  
The North ◽  
Western Mediterranean Sea

A 29-year wind/wave hindcast is produced over the Mediterranean Sea for the period 1990–2018. The dataset is obtained by downscaling the ERA5 global atmospheric reanalyses, which provide the initial and boundary conditions for a numerical chain based on limited-area weather and wave models: the BOLAM, MOLOCH and WaveWatch III (WW3) models. In the WW3 computational domain, an unstructured mesh is used. The variable resolutions reach up to 500 m along the coasts of the Ligurian and Tyrrhenian seas (Italy), the main objects of the study. The wind/wave hindcast is validated using observations from coastal weather stations and buoys. The wind validation provides velocity correlations between 0.45 and 0.76, while significant wave height correlations are much higher—between 0.89 and 0.96. The results are also compared to the original low-resolution ERA5 dataset, based on assimilated models. The comparison shows that the downscaling improves the hindcast reliability, particularly in the coastal regions, and especially with regard to wind and wave directions.

scholarly journals Preliminary results of drift-bottle releases and recoveries in the Western Tropical Atlantic

1967 ◽  
Vol 16 (1) ◽  
pp. 13-22 ◽  
Author(s):  
Ellen F. Luedemann
Keyword(s):  
Surface Current ◽  
Northeastern Brazil ◽  
Brazilian Coast ◽  
Northern Coast ◽  
The North ◽  
Strong Current ◽  
North Brazil ◽  
Equatorial Current ◽  
The Caribbean ◽  
Area North

In February-March 1963, during the Equalant Operation for the ICITA program, 476 drift-bottles were released at the equatorial waters off the northern Brazilian coast (01ºS to 09ºN and 043ºW to 053ºW). Thirty-five, bottles were recovered (7,4%). Those were classed in five groups according to their different velocity ranges and areas of recovery (Trinidad Island; Lesser Antilles; Caribbean and Florida area; north Brazil; northeastern Brazil). The recoveries of bottles released within 300 nm off the northern and northeastern coast of Brazil confirmed a strong current along the north and northeast coast in northwestern direction (South Equatorial Current and branches). In late February-early March the bottles showed maximum velocities of this current (3,6 knots). The region off the northern coast of Brazil, between 05ºN and 09ºN up to 050ºW seems to have been under the influence of an eastward component of the surface current in this same period, while at late March this influence appears to have been weaker. In the region from Trinidad Island to Yucatan Peninsula the current seems to be stronger on the northeastern side of the Caribbean Sea.

The Britons in Southern Scotland

Antiquity ◽  
1955 ◽  
Vol 29 (114) ◽  
pp. 77-88 ◽  
Author(s):  
Kenneth Jackson
Keyword(s):  
Iron Age ◽  
Roman Period ◽  
Anglo Saxon ◽  
Medieval Period ◽  
The West ◽  
Early Medieval Period ◽  
The North ◽  
Dark Ages ◽  
The People ◽  
Northern Portion

The archaeological background of the people of what is now Scotland south of the Forth and Clyde in the Roman period was a La Téne one, and specifically chiefly Iron Age B. This links them intimately with the Britons of southern Britain in the conglomeration of Celtic tribes who called themselves Brittones and spoke what we call the Brittonic or Ancient British form of Celtic, from which are descended the three modern languages of Welsh, Cornish and Breton. To the north of the Forth was a different people, the Picts. They too were Celts or partly Celts; probably not Brittones however, but a different branch of the Celtic race, though more closely related to the Brittones than to the Goidels of Ireland and (in later times) of the west of Scotland. Not being Brittonic, the Picts may be ignored here. Our southern Scottish Brittones are nothing but the northern portion of a common Brittonic population, from the southern portion of which come the people of Wales and Cornwall. Some historians speak of the northern Brittones as Welsh, following good Anglo-Saxon precedent, but this is apt to lead to confusion. The best term for them, in the Dark Ages and early Medieval period, as long as they survived, is ‘Cumbrians’, and for their language, ‘Cumbric’. They called themselves in Latin Cumbri and Cumbrenses, which is a Latinization of the native word Cymry, meaning ‘fellow-countrymen’, which both they and the Welsh used of themselves in common, and is still the Welsh name for the Welsh to the present day. The centre of their power was Strathclyde, the Clyde valley, with their capital at Dumbarton.

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