A erosão costeira na Praia da Armação do Pântano do Sul, no litoral catarinense

O presente trabalho tem como objetivo relatar, de forma geral, os sistemas atmosféricos e os processos oceanográfcos mais signifcativos queestão relacionados aos episódios de erosão que vem sofrendo a Praia daArmação do Pântano do Sul, na Ilha de Santa Catarina

Monitoramento on-line da qualidade da água com o uso de sondas Multiparâmetros

Abstract: To monitor the water quality of rivers knowing the concentration of physical-chemical compounds in rivers is the basis for several technical and scientific studies in water resources. Besides, this technique can be used to support the management of water resources. This paper presents recommendations for installation and programing of the multiparameter probes based on the experience of Epagri´s water bodies monitoring team. Furthermore it describes the connection and data transmission based on data logger and GPRS (general packet radio service) modem.Resumo: Conhecer a qualidade da água de rios pelo monitoramento da concentração de compostos físico-químicos é uma etapa importante para diversos estudos técnico-científicos e para o apoio à gestão dos recursos hídricos. Neste informativo estão apresentadas as recomendações de instalação e de programação de sondas multiparâmetros utilizadas pela equipe da Epagri no monitoramento tanto qualitativo como quantitativo de corpos hídricos. Ademais, está apresentada a forma de conexão e transmissão de dados com o uso de unidades de armazenamento de dados e modem GPRS (general packet radio service).

Estudo preliminar de características oceanográficas e meteorológicas presentes na pesca da tainha no sul do Brasil

Este trabalho tem como objetivo analisar preliminarmente as características oceanográficas e meteorológicas (TSM, ondas, vento e ciclones) presentes na pesca da tainha no período de 2001-2010. Os resultados mostram que as TSM frias favorecem a pesca, mas volumes significativos podem ser capturados em anos com TSM altas. As ondas com alturas maiores de 1,5m são comuns no período da pesca. A predominância de vento do quadrante sul não necessariamente determina maior volume de tainha pescado. A frequência de ciclones maior em maio não interfere fortemente na pesca. Os volumes pescados revelam nos últimos anos uma alternância de safras boas e ruins. A carência de dados deixou lacunas que precisam ser preenchidas em trabalhos futuros; esses devem envolver outras variáveis e escalas temporais e espaciais diferentes das adotadas no presente estud

Comparação de dois protocolos de aquisição de dados para sensores de marégrafos no porto de Imbituba – Santa Catarina

The Santa Catarina Tide Gauge Network (SCTGN) is a continuous sea level monitoring system to support fishery, aquaculture, and navigation in general.  Deployed in the state of Santa Catarina, Brazil, the initiative started in 2012 with one tide gauge at the Santa Catarina Island South Bay to support aquaculture research projects and hydrodynamic numerical modelling. By 2020, the SCTGN was fully operational, consisting of 11 tide gauge stations along the 450km of the Santa Catarina coastal line. The next step is standardizing these tide stations to international data collection protocols. Knowledge of the effects different programming protocols have on data collection are important since they may affect the results. Data from a radar gauge (RG) and a vented (or relative) pressure gauge (VPG) were obtained over six months. The difference between RG and VPG measurements showed a 5.07cm2 variance. Percentage of reading errors was 0.03% and 0.77% for RG and VPG, respectively. This study aims to evaluate the feasibility of the SCTGN data collection protocol in the RG to comply with the Intergovernmental Oceanographic Commission (IOC) recommendations for sea level monitoring. We find that an RG gauge using the SCTGN protocol is adequate to monitor sea levels and has an easier installation and maintenance, and more stable vertical datum control.Um sistema de monitoramento contínuo do nível do mar foi implantado para apoiar a aquicultura, pesca e a navegação em geral. A iniciativa, denominada de SCTGN (do inglês Santa Catarina Tide Gauge Network), foi iniciada no ano de 2012 com uma estação maregráfica na Baía Sul da Ilha de Santa Catarina para apoiar projetos de pesquisa na área de aquicultura e modelagem numérica hidrodinâmica. No ano de 2020, a SCTGN se estabeleceu com 11 estações maregráficas. A próxima etapa é padronizar as estações para atender aos protocolos internacionais de coleta de dados. O conhecimento sobre os efeitos de distintos protocolos de programação nas estações maregráficas são muito importantes, pois podem afetar os resultados das medições do nível do mar. Dados do sensor de radar (RG) e do sensor de pressão ventilado (ou relativo) (VPG) foram coletados durante um período de seis meses no mesmo local. A variância da diferença entre os dois sensores foi de 5,07 cm2. O percentual de erro de leituras foi de 0,03% e 0,77% para o RG e o VPG, respectivamente. O objetivo do estudo foi avaliar a viabilidade do uso do protocolo de coleta de dados do SCTGN associado com o sensor RG par atender as recomendações do Intergovernmental Oceanographic Commission (IOC) para monitoramento do nível do mar. O uso do protocolo adotado para a SCTGN no marégrafo RG é adequado para monitoramento do nível do mar e tem vantagens em relação ao VPG no que se refere a facilidade de instalação, manutenção e garantia de estabilidade do datum vertical

Modelo de utilidade de marégrafo de boia e contrapeso com estrutura compacta

The sea level monitoring is extremely important for a variety of actvites like sailing, urban planning, environment, tourism and aquaculture. The monitoring is accomplished with equipments named as tde gauges. This document presents the utlity model for the installaton of a tde gauge of buoy and counterweight in a compact support structure with low cost installaton.O acompanhamento do nível do mar é de extrema importância para uma série de atvidades como navegação, planejamento urbano, meio ambiente, turismo e aquicultura. O monitoramento é feito por equipamentos denominadosmarégrafos. Neste informatvo é descrito um modelo de utlidade para a instalação de marégrafos do tpo boia e contrapeso utlizando uma estrutura compacta e de baixo custo de instalaçã

Modelling And Validation Of The Santa Catarina Island Bays Hydrodynamics Based On Astronomic Tides And Measured Tides

Santa Catarina Island bays (SCI bays) has a great economic and social importance in the region. With more than 700.000 habitants in its surroundings, besides touristic and fishery activities, it represents approximately 70% of the Brazilian bivalve shellfish production. In order to understand processes controlling the water quality and food availability, relevant for the shellfish production, it is unquestionably important to understand the main hydrodynamics patterns of SCI Bay. Thus, a hydrodynamic assessment study of the SCI bays was carried out using the numerical model MOHID. The model was implemented using bathymetric information obtained from Brazilian nautical charts, two tide gauges in each one of the bays entrances and two meteorological stations. The fresh water input flow from affluent streams was discretized into 47 major catchments, representing total average flow of approximately 32 m3.s-1. An acoustic Doppler current profiler (ADCP) was deployed in two different locations, during a period of 28 days each, in order to obtain a time series of currents velocity and direction, which were then used to validate the model. An assessment of the model outputs using astronomical tides and measured tides is in development to evaluate the meteorological tide influence. Preliminary results using measured tide show correlation coefficients for water level of 0.95 and mean velocity errors of 0.14 and 1.98 cm.s-1 for U and V, respectively. The results of the hydrodynamic model will be used to drive the water quality model for bacteriological dispersion and decay, aiming to predict its potential influence on local bivalve farms

Beachfront Owners Perception of Beach Erosion along an Armored Shoreline in Southern Brazil

Brazil has about 8500 km of coastline that is mostly undeveloped. However, the pressure of fast-growing coastal urban centers is already impacting the shore. This paper characterizes shore protection works in Hermenegildo Beach, evaluates their efficiency to protect property against the impact of storm events, and presents the response of beachfront owners to erosion. Hermenegildo is a beach village located 12km north of the border with Uruguay in Rio Grande do Sul, the southernmost state in Brazil. Several factors contribute to beach erosion in Hermenegildo: storm surge, redistribution of wave energy, rising sea level, the presence of an underlying layer of impermeable peat, and human activities. The shoreline is heavily armored with about 61% of beachfront houses protected by revetments (30%), seawalls (18%), or a combination of both (13%). A strong storm struck the Rio Grande do Sul coast in 16 April 1999 and resulted in severe beach erosion and destroyed 22 houses, besides all concrete structures, half of the quarrystone revetments, and 80% of the timber seawalls. Shore protection structures in Hermenegildo are threatened by erosion because: (1) they were built too close to the water, (2) shoreline retreat has been observed, and (3) armoring has reduced beach width. Most of the beachfront owners are aware of the severe beach erosion problem and appear to understand basic coastal dynamics. About 82% of the interviewed beachfront owners lost property due to erosion; 88% subsequently built protection structures to prevent further loss. Surprisingly, 88% of those who did not experience property damage also built defense structures. Armoring is commonly an initiative of beachfront owners who build low-budget structures without consultation by technical experts

Níveis e origem da acidificação das chuvas na região do Rio Grande, RS

The current article presents the first data on physical-chemical parameters of wet precipitation collected at single collection point in the city of Rio Grande, during the period of 12 months in 1997-1998. The employed technique of rainwater separation into several portions made clear the process of the atmosphere self-purification during a precipitation event. The pH of rainwater depends on the extent of industrial emissions and increases during a precipitation event. The first portion of rainwater shows an obvious neutralizing effect of soil and ocean-derived components, whose intensity depends on the duration of the preceding dry period

Avaliação de poluição do ar por chumbo particulado: uma abordagem geoquímica

High lead concentrations up to 5478 mg kg-1 were detected in dry atmospheric precipitations in Rio Grande city and adjacent area. Lead anomalies cover up to 30% of the study area. Lead concentration measurement in dry atmospheric precipitation and suspended particulate matter provides a possibility to detect concentrations above lead threshold in the air. The most impacted areas are fishermen's villages. The most possible source of lead in the air is uncontrolled sub industrial activity of local populatio

Evaluation of the air pollution by particulate lead: geochemical approach

Submitted by Bruna Vieira ([email protected]) on 2012-04-03T01:58:41Z No. of bitstreams: 1 AVALIAÇÃO DE POLUIÇÃO DO AR.pdf: 515856 bytes, checksum: a7556ab249a1d43320f29ce9c6faa80e (MD5)Approved for entry into archive by Sabrina Andrade([email protected]) on 2012-06-26T21:55:53Z (GMT) No. of bitstreams: 1 AVALIAÇÃO DE POLUIÇÃO DO AR.pdf: 515856 bytes, checksum: a7556ab249a1d43320f29ce9c6faa80e (MD5)Made available in DSpace on 2012-06-26T21:55:53Z (GMT). No. of bitstreams: 1 AVALIAÇÃO DE POLUIÇÃO DO AR.pdf: 515856 bytes, checksum: a7556ab249a1d43320f29ce9c6faa80e (MD5) Previous issue date: 2003High lead concentrations up to 5478 mg kg-1 were detected in dry atmospheric precipitations in Rio Grande city and adjacent area. Lead anomalies cover up to 30% of the study area. Lead concentration measurement in dry atmospheric precipitation and suspended particulate matter provides a possibility to detect concentrations above lead threshold in the air. The most impacted areas are fishermen’s villages. The most possible source of lead in the air is uncontrolled sub industrial activity of local population