Alejandro José Vitale

Alejandro José Vitale
National Scientific and Technical Research Council | conicet · IADO - Instituto Argentino de Oceanografía

Doctor of Engineering

About

49
Publications
12,145
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325
Citations

Publications

Publications (49)
Article
This work combines in situ measurements with a time series of satellite turbidity derived from Landsat 8-OLI images to provide a first synoptic overview of the main hydrometeorological drivers of turbidity in the Bahía Blanca Estuary (Argentina). An empirical relationship between turbidity and SPM concentrations was established for the study area (...
Article
Full-text available
Nutrient discharge into rivers and estuaries and the factors that control it need to be further understood to decrease the risk of harmful algae blooms on these ecosystems. Preliminary seasonal physicochemical parameters at six stations along the Negro River Estuary (Argentina) were studied during 2019 (Austral summer, winter, and spring) with high...
Article
A wide range of processes determine the hydrodynamics and sedimentary balance in tide-dominated estuarine environments. Tidal channels can be subject to the most energetic processes. Therefore, changes in their geomorphology require continuous updates. Through oceanographic surveys, were collected in situ hydrodynamic, bathymetric, and sedimentolog...
Article
We used airborne hyperspectral images to generate a dense survey of bathymetric data in the Bahía Blanca estuary (Buenos Aires Province, Argentina). This estuarine area is characterized by intense sediment transport turning the water muddy, and thus optical bathymetric estimations are difficult. We used 24 spectral bands in a range of 500–900 nm ac...
Conference Paper
AERONET-OC collects data from worldwide distributed autonomous CE-318 sun-photometers adapted to provide measurements of the radiance emerging from the sea (i.e., water-leaving radiance). The network supports satellite ocean color validation activities through standardized measurements performed at different sites with a single measuring system and...
Article
Full-text available
With conventional monitoring at low-frequency, biological responses to weather-related events are missed. In this paper, we examine the chlorophyll-a concentrations in a shallow lake using high-frequency data from an in situ buoy. Also, we used monthly data of phytoplankton to relation high and low-frequency data. This is the first study about chlo...
Article
Full-text available
According to model projections, increases in the frequency and intensity of heatwaves are expected all over the world. This study analyzed, for the first time, the effect of heatwaves events on long term surface latent (LE) and sensible heat fluxes (H) from two shallow lakes: La Salada lake (LS - 39°27′ S, 62°42′ W) and Sauce Grande lake (SG - 38°5...
Article
Full-text available
Here we present a preliminary methodology and unprecedented data for sandy beach surf zones, focused on understanding the effects of the passage of storm events in surf- zooplankton communities. The main objectives of the present study were to analyze the variation of surf zone physical parameters during several storm events, which have occurred on...
Article
We present an experimental analysis of hydraulic roughness variations due to changes in alluvial cover in a mixed bedrock-alluvial meandering channel with larger bedrock roughness than alluvial roughness. Three sets of experiments were conducted in a highly sinuous flume: one with bare bedrock, and two with enough sediment to cover 21% and 78% of t...
Preprint
Full-text available
Accepted in Water Resources (ISSN 0097-8078): With conventional monitoring at low-frequency, biological responses to weather-related events are missed. In this paper, we examine the chlorophyll-a concentrations in a shallow lake using high-frequency data from an in situ buoy. Also, we used monthly data of phytoplankton to relation high and low-freq...
Article
Shallow lakes, because of their depth, are more vulnerable to the effects of wind and changes in precipitation and evaporation that deeper lakes and thus respond more dramatically to extreme climatic events, such as drought. The morphology of shallow lakes many of their physical, chemical, biological and sedimentological processes including sedimen...
Article
Full-text available
Detailed knowledge of nearshore topography and bathymetry is required for a wide variety of purposes, including ecosystem protection, coastal management, and flood and erosion monitoring and research, among others. Both topography and bathymetry are usually studied separately; however, many scientific questions and challenges require an integrated...
Chapter
Full-text available
Las lagunas de la región pampeana son ambientes naturales que poseen la particularidad de “atraparnos” por diferentes razones. Quizás sea por la tranquilidad que trasmiten sus aguas, el sonido del oleaje, el silencio, su aire fresco y renovador, sus amaneceres, sus atardeceres, el sonido de algunas aves, el disfrute de la pesca o por el contacto co...
Article
Planktonic ciliates constitute a fundamental component among microzooplankton and play a prominent role in carbon transport at the base of marine food webs. How these organisms respond to shifting environmental regimes is unclear and constitutes a current challenge under global ocean changes. Here we examine a multiannual field survey covering 25 y...
Article
Full-text available
Identificar el potencial de los recursos energéticos renovables es de gran interés dentro de la planificación energética. El objetivo principal de este estudio es evaluar los recursos eólico, solar y undimotriz en el Suroeste de la provincia de Buenos Aires (Argentina), analizando su potencial para la producción de electricidad, su relación con la...
Conference Paper
Full-text available
El rasgo hidrodinámico más relevante para este tramo del canal meandriforme, es la generación de un vórtice en el que las corrientes de flujo y de reflujo interactúan con la morfología del fondo del canal y los veriles, sobre todo en las adyacencias del meandro. La ocurrencia de este vórtice el cual se hace presente predominantemente durante la baj...
Article
Full-text available
Understanding the drivers and how they affect ecosystem metabolism is essential for developing effective management policy and plans. In this study, net ecosystem production (NEP), ecosystem respiration (R), and gross primary production (GPP) rates were estimated in relation to physicochemical, hydrological, and meteorological variables in La Salad...
Article
Lakes, rivers, estuaries and ocean waters control many important natural functions at the regional-global level. Hence, integrative and frequent long-term water monitoring is required globally. This paper describes the main features and innovations of a low-cost monitoring buoys network (MBN) deployed in a temperate region of Argentina. The MBN was...
Poster
Full-text available
La costa de Pehuen Co fue afectada por una tormenta causada por el paso de un centro de baja presión entre los días 19 y 21 de mayo de 2017. Durante este evento fueron monitoreadas de forma autónoma variables oceanográficas y meteorológicas mediante una estación que registra los parámetros cada 10 minutos y transmite los datos vía GPRS a un servido...
Article
Full-text available
This study presents a practical open source implementation that uses double-multiple streamtube model for the aerodynamic performance prediction of straight-bladed vertical axis wind turbines, particularly, the power coefficient (Cp) and tip speed ratio (λ) relationship. To improve the analytical capability of the proposed implementation, important...
Article
Full-text available
O objetivo deste estudo foi analisar o comportamento termohigrométrico em diferentes locais da cidade. Para isso, foram projetadas e instaladas dez estações meteorológicas em diferentes bairros da cidade de Bahía Blanca (Argentina) durante 408 dias com frequência de amostragem de 30 minutos. A análise foi realizada em diferentes escalas de tempo: a...
Article
Knowledge of the surface radiation balance and associated components in intertidal wetlands is essential to the understanding of the ecosystem. The aim of this study is to assess the behavior of the radiation balance (or net radiation) and its components in a salt marsh environment (Bahía Blanca Estuary, Argentina), taking into consideration two di...
Article
Full-text available
In semi-arid environments there is often a lack of data on hydrological variables that limits the ability to understand key hydrological processes. In response to this need, geomorphometric analysis is a quantitative approach that has proven to be useful. This work aims to assess and classify 35 exorheic drainage basins located in a semi-arid area...
Article
Full-text available
A new measurement system based on open source electronics (Arduino) was designed to obtain high frequency data to study Urban Heat Island (UHI). The instrument registers geo-referenced information of air temperature, relative humidity, barometric pressure and altitude above sea level in a moving vehicle. The device was designed to analyze the UHI i...
Article
Full-text available
Studies based on continuous monitoring of diel changes in dissolved oxygen concentration allow the estimation of ecosystem metabolism and provide a measure of the overall trophic processes of an ecosystem. In this study, net ecosystem production (NEP), community/ecosystem respiration (R), and gross primary production (GPP) rates were estimated in...
Article
Full-text available
The aim of this work is to evaluate the applicability of the 3D model obtained through Structure-from-Motion (SFM) from unmanned aerial vehicle (UAV) imagery, in order to characterize bioerosion patterns (i.e., cavities for roosting and nesting) caused by burrowing parrots on a cliff in Bahía Blanca, Argentina. The combined use of SFM-UAV technolog...
Article
Full-text available
An assessment of wind energy potential was carried out in five sites (four onshore and one offshore) in South-West of Buenos Aires province (Argentina). We use high-resolution wind data (2 and 5 min) for the period 2009-2012. The power law was used to estimate the wind speed at 30, 40 and 60 m height from the anemometer position. Turbulence intensi...
Poster
Continuous monitoring of changes in dissolved oxygen concentration (DO) allows the estimation of ecosystem metabolism and provides a measure of the overall activity of an ecosystem, summarizing the biogeochemical and trophic processes, and determining the efficiency of resource processing. The aim of this study was to determine the temporal dynamic...
Poster
Full-text available
INTRODUCCIÓN Las lagunas pampeanas son lagos de llanura de escasa profundidad, caracterizados generalmente por falta de estratificación térmica. Estos cuerpos de agua presentan tiempos de residencia y salinidad variables, son naturalmente eutróficos y actualmente se encuentran bajo estrés ambiental que se traduce en un incremento de su contenido de...
Article
Full-text available
It is well known that water temperature directly affects fish reproduction. The aim of this study was to develop a predictive model to determine water temperature conditions on a typical Pampas shallow lake (Chascomu´s, 35�360S, 58�020W) from local climate variables (specifically air temperature and rainfall). In addition, this model was used to as...
Article
Full-text available
This paper describes a three-dimensional numerical model of heat flux using finite-difference approximation for the simulation, prediction, and visualization of sediment, water, and air temperature, applied in Villa del Mar saltmarsh, Bahía Blanca Estuary, Argentina. To make this computation, we develop an open-source software tool called Hemera 1....
Conference Paper
Assessment of physicochemical and biological characteristics of La Salada shallow lake (Argentina) using high frequency buoy data Argentinian Pampean lakes are shallow and naturally eutrophic. Because their great area/volume ratio can respond to environmental, hydrological and anthropogenic changes modifying their water characteristics. La Salada i...
Article
Full-text available
Coastal geomorphology is significantly influenced by waves because they are a major agent in removing and transporting sediments. Furthermore, any kind of human coastal activity is influenced by waves. Consequently, it is essential to know about the wave distribution of the coastal areas. The aim of this study was to analyze the waves at Monte Herm...
Article
Full-text available
RESUMEN: La tecnología del hidrógeno es prometedora para la sustitución de los combustibles fósiles. La obtención del hidrógeno requiere una fuente de energía importante. Esta fuente de energía puede ser producto de un combustible contaminante y no renovable o no contaminante y renovable. La decisión en uno u otro sentido estará enmarcada en el cam...
Article
Full-text available
The present paper presents a new methodology for assessing the effectiveness of the teaching- learning process in engineering careers. This has been designed by considering the cognitive and ecological approaches not commonly used in engineering careers nor in technical courses. The methodology considers not only the results of the grades obtained...
Chapter
Full-text available
The mesotidal estuary of Bahía Blanca (Argentina) has marked ebb-oriented residual flow and sediment transport. Along the Canal Principal, there is a series of subtidal dune fields with a well defined ebb displacement. Including some forms have very steep lee side where flow separation is evident. However, a sector of the Canal Principal of over 2....
Article
The main problem of a wind turbine generator design project is the design of the right blades capable of satisfying the specific energy requirement of an electric system with optimum performance.Once the blade has been designed for optimum operation at a particular rotor angular speed, it is necessary to determine the overall performance of the rot...
Article
Full-text available
Zeus Diseñador was developed to design low-power, horizontal-axis wind turbine blades, by means of an iterative algorithm. With this software, it is possible to obtain the optimum blade shape for a wind turbine to satisfy energy requirements of an electric system with optimum rotor efficiency. The number of blades, the airfoil curves and the averag...
Article
Consider an hypothetical image processing system, where a given target is to be identified. The usual sequence of steps consists on an image equalization to adapt to the illumination situation. Then the image is binarized, allowing a morphological filter to correct the noisy edges and shapes by means of an indeterminate sequence of openings or clos...
Article
Full-text available
Image processing applications can be characterized as an it-erative design of a sequence of processing steps among an heterogeneous set of tools and techniques The user of an application must choose the most adequate, and apply it with the convenient parameter, mostly on a trial and error basis. The Image Processing Spreadsheet PDICalc was proposed...

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Project (1)
Project
Through underwater studies (ADCP, Sonar Side Scan, Multibeam, etc.), sediment stability and hydrodynamical models, geomorphological, sedimentological and geochemical analysis; the stability and fate of cohesive and granular sediments are analyzed to understand and predict environmental behavior.