André Pacheco

André Pacheco
Universidade do Algarve | UALG · Centro de Investigação Marinha e Ambiental (CIMA)

PhD Physical Oceanography

About

64
Publications
21,224
Reads
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970
Citations
Citations since 2017
21 Research Items
680 Citations
2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140
Additional affiliations
April 2012 - present
Universidade do Algarve
Position
  • PostDoc Position
Description
  • Examine aspects related to the potential installation of Tidal Stream Turbines (TSTs) on a confined tidal inlet channel, in particular.
October 2011 - March 2012
Universidade do Algarve
Position
  • PostDoc Position
Description
  • Field data collection of overwash events over breakwaters to set-up, calibrate and validate a Smoothed Particle Hydrodynamic modeldeveloped by the project leader Dr. Eric Didier from the Portuguese National Laboratory of Civil Engineering (LNEC)
January 2011 - September 2011
Universidade do Algarve
Position
  • PostDoc Position
Description
  • Data processing, development of Early Warning Systems to prevent impact of extreme storm events and scientific spreading actions.
Education
December 2006 - January 2010
Universidade do Algarve
Field of study
  • Physical Oceanography
September 1996 - September 2002
Universidade do Algarve
Field of study
  • Environmetal sciences

Publications

Publications (64)
Article
The development on tidal turbine technology is ongoing with focus on several aspects, including hydrodynamics, operation and environment. Before considering an area for exploitation, tidal energy resource assessments in pre-feasibility energy extraction areas must include the relevant characteristics of the device to be used. The present paper uses...
Article
Although it is generally acknowledged that most multiple inlets are unstable and cannot coexist, there is evidence to suggest that such inlets can indeed be stable over decadal time scales. Multiple-inlet systems servicing a single embayment, in contrast to single-inlet systems, confer particular hydrodynamic characteristics such as the potential e...
Conference Paper
Full-text available
RESUMO A implementação de estratégias de circularidade pode ser um importante contributo para a melhoria da eficiência da gestão dos recursos naturais, nomeadamente da água e da energia, sobretudo nas zonas urbanas onde vive a maioria da população mundial. No domínio do ciclo urbano da água, essa eficiência é fundamental, sobretudo no atual cenário...
Article
Islands have the potential to be precursors in the transition to clean energy, by adopting new technologies and applying innovative solutions that can serve as showcases at an international level. This paper is a contribution towards understating the importance of community engagement on energy transition processes. It covers multiple aspects of a...
Article
Full-text available
In this paper the turbulence effects are studied for three rotors mounted on the same instrumented hub. Two scaled models of industrial turbines and one open-geometry turbine are considered. The turbulence characteristics are obtained from 2D Laser Doppler Velocimeter measurements and the turbine behaviour is analysed from thrust and torque measure...
Article
Full-text available
The energy that can be extracted from tidal currents is one of the most promising renewable energy sources due to its high density/predictability. Within this paper this energy source is evaluated economically respecting sustainability principles. This evaluation contrasts from previous studies due to the application of a cost-benefit analysis base...
Article
The Ria Formosa is a sheltered large coastal lagoon located on the Atlantic South Coast of Portugal, that has been classified as a natural park since 1987. The lagoon hosts a diverse and abundant fish community and other species of commercial importance. Several economical activities are supported by shipping, and as such, vessel traffic within the...
Preprint
Full-text available
This paper presents the results of a pilot experiment with an existing tidal energy converter (TEC), Evopod 1 kW floatable prototype, in a real test case scenario (Faro Channel, Ria Formosa, Portugal). A baseline marine geophysical, hydrodynamic and ecological study based on the experience collected on the test site is presented. The collected data...
Article
Full-text available
Overwash hydrodynamic datasets are mixed in quality and scope, being difficult to obtain due to fieldwork experimental limitations. Nevertheless, these measurements are crucial to develop reliable models to predict overwash. Aiming to overcome such limitations, this work presents accurate fieldwork data on overwash hydrodynamics, further exploring...
Chapter
Full-text available
This paper presents a study for estimating the size of a tidal turbine array for the Faro-Olhão Inlet (Potugal) using a surrogate optimization approach. The method compromises problem formulation, hydro-morphodynamic modelling, surrogate construction and validation, and constraint optimization. A total of 26 surrogates were built using linear RBFs...
Article
A B S T R A C T - This paper investigates the optimum tidal energy converter array density at a tidal inlet by applying surrogate-based optimisation. The SBO procedure comprises problem formulation, design of experiments, numerical simulations , surrogate model construction and constrained optimisation. This study presents an example for the Faro-O...
Conference Paper
Full-text available
This paper presents the results of a pilot experiment with an existing tidal energy converter (TEC), Evopod 1 kW floatable prototype, in a real test case scenario (Faro Channel, Ria Formosa, Portugal). Operational results related to the description of power generation capacity, energy capture area and proportion of energy flux are presented and dis...
Presentation
Full-text available
This presentation presents the results of a pilot experiment with an existing tidal energy converter (TEC), Evopod 1 kW floatable prototype, in a real test case scenario (Faro Channel, Ria Formosa, Portugal). Operational results related to the description of power generation capacity, energy capture area and proportion of energy flux are presented...
Article
Full-text available
This paper presents the results of a pilot experiment with an existing tidal energy converter (TEC), Evopod 1 kW floatable prototype, in a real test case scenario (Faro Channel, Ria Formosa, Portugal). A baseline marine geophysical, hydrodynamic and ecological study based on the experience collected on the test site is presented. The collected data...
Conference Paper
Full-text available
This paper investigates the effects of Tidal Energy Converter (TEC) array size at a tidal channel on flood/ebb discharges at multi-inlet coastal lagoon by applying numerical modelling. The paper presents a case study for the Faro-Olhão inlet in the Ria Formosa (Portugal), a potential site for tidal in-stream energy extraction. Arrays of up to 11 ro...
Poster
Full-text available
This paper investigates the effects of Tidal Energy Converter (TEC) array size at a tidal channel on flood/ebb discharges at multi-inlet coastal lagoon by applying numerical modelling. The paper presents a case study for the Faro-Olhão inlet in the Ria Formosa (Portugal), a potential site for tidal instream energy extraction. Arrays of up to 11 row...
Conference Paper
Full-text available
Overwash hydrodynamics datasets are mixed in quality and scope, being hard to obtain due to fieldwork experimental difficulties. Aiming to overcome such limitations, this work presents accurate fieldwork data on overwash hydrodynamics, further exploring it to model overwash on a low-lying barrier island. Fieldwork was performed on Barreta Island (P...
Conference Paper
Full-text available
Overwash hydrodynamics were measured during a storm event. Data from literature and fieldwork were used to setup a numerical model, using XBeach in non-hydrostatic mode. Different simulations were conducted to assess the influence of several factors on overwash statistics. Nearshore morphology was found to greatly influence overwash. Sediment mean...
Article
The challenge for floating offshore wind structures is to reduce costs. The industry needs a wind turbine support solution that can be fabricated and deployed from existing shipyards and port facilities, while investors need accurate estimations and forecasts of wind resources and quantified information on the inherent variability in wind power gen...
Article
The challenge for floating offshore wind structures is to reduce costs. The industry needs a wind turbine support solution that can be fabricated and deployed from existing shipyards and port facilities, while investors need accurate estimations and forecasts of wind resources and quantified information on the inherent variability in wind power gen...
Article
Full-text available
The east coast of the Algarve (Olhos de Água – Guadiana) is a low sandy coast with a high diversity of environments, including a cliffed coast, sandy beaches, dune ridges, an estuary, artificial/antrophic sectors and a main, complex, central morphology: the Ria Formosa barrier islands and coastal lagoon system. The large majority of this coastal se...
Article
The seasonal and annual nitrogen (N), phosphorus (P), and carbon (C) budgets of the mesotidal Ria Formosa lagoon, southern Portugal, were estimated to reveal the main inputs and outputs, the seasonal patterns, and how they may influence the ecological functioning of the system. The effects of extreme weather events such as long-lasting strong winds...
Article
The east coast of the Algarve (Olhos de Água – Guadiana) is a low sandy coast with a high diversity of environments, including a cliffed coast, sandy beaches, dune ridges, an estuary, artificial/antrophic sectors and a main, complex, central morphology: the Ria Formosa barrier islands and coastal lagoon system. The large majority of this coastal se...
Article
Ancão Inlet is a small migrating inlet that was relocated in 1997 and has been monitored since then. In October 2015, it was about to conclude its third eastward migrating cycle since the 1940s. Morphological parameters and migration rates were correlated with oceanographic settings to evaluate the importance of different mechanisms in the evolutio...
Article
Full-text available
This work intends to determine if low-cost surveying techniques based on recreational echosounders can be used to perform nearshore bathymetry for analysing evolution of coastal sectors. For that purpose two hydrographic surveying techniques were compared, i.e. (1) a RTK-DGPS synchronised with a single beam echo sounder with real time tidal elevati...
Data
The CURTTOOLBOXv1.0 is a collection of scripts for computing hydrodynamic parameters and total (bedload+suspended) sediment transport derived from Acoustic Doppler Profilers (ADP's). The m-files were written for a 1500kHz ADP operating on bottom tracking (SonTek/YSI, Inc).
Article
Full-text available
Research into the consequences of engineering works on the long-term behaviour of inlet systems has been hindered by the absence of suitable datasets, the shortcomings of existing formulae and evaluation tools. Cross-sectional channel areas adjust to hydrodynamics and sediment transport conditions. The impacts of a new inlet on the adjacent shoreli...
Article
Full-text available
This paper presents a statistical evaluation of two theoretical fitting methods — logarithmic and power law — commonly used to extrapolate velocities to unmeasured areas of a vertical profile, such as near-bottom velocities. Analysis of covariance (ANCOVA) was used to test the models' performance when applied to velocity data collected with a boat-...
Article
Full-text available
The study aims to calibrate/validate and apply the dune-erosion model, XBeach, in order to predict morphological response to storm events along a meso-tidal, steeply sloping beach. More than 10,000 XBeach calibration runs, including different model parameters and erosion events, were compared with measurements of beach-profile response to storm con...
Article
Very few studies have quantified the wave friction factor, f w , for coarse sediments at field-scale. To address this shortcoming, high-frequency measurements of turbulence obtained within the boundary layer of irreg-ular waves over gravel in the Delta Flume, have been used to calculate values of f w using different evaluation methods. In the field...
Conference Paper
The present contribution presents efforts towards the development of an operational Early Warning System for storm hazard prediction and mitigation. The system consists of a calibrated nested-model train which consists of specially calibrated Wave Watch III, SWAN and XBeach models. The numerical simulations provide daily forecasts of the hydrodynam...
Conference Paper
Full-text available
Tidal currents offer considerable potential for the generation of renewable energy. A study to assess the potential of a site for tidal energy extraction needs to be effective on providing information on the precise distribution of the tidal stream energy (Carballo et al., 2009) as well as detailed assessment of the sites potentially viable for ins...
Article
Full-text available
This article defines short-term (tidal cycle) sediment-transport patterns at a backbarrier beach based on detailed field studies. Fieldwork was planned to record nonstorm, spring tide conditions that enable the definition of background sediment dynamics at the study area. The experiment was set at two beach morphologies: beach face and sandbank. Cu...
Article
In this study, the artificial opening of a new tidal inlet in an existing multiple inlet system is shown to significantly modify the adjacent nearshore and backbarrier morphology, as well as both updrift and downdrift shorelines. The study focuses on the dominant Faro-Olhão and Armona inlets in the Ria Formosa barrier island system of southern Port...
Article
A sandy beach in the south of Portugal (Faro beach, Ria Formosa) was surveyed from the dune crest seaward to 15 m depth 20 times over a period of 26 months. Wave time-series between surveys were analysed to obtain relationships between wave height and vertical profile variations and to define wave thresholds for important morphological changes. Res...
Thesis
Full-text available
Research into the consequences of engineering works on the long-term behaviour of inlet systems has been hindered by the absence of suitable datasets, the shortcomings of existing formulae when applied to different inlets, and the difficulties particular to multi-inlet situations. Cross-sectional channel areas adjust to hydrodynamics and sediment t...
Article
Full-text available
Bezerra, M., Ferreira, O., Pacheco, A., Freitas, M. C., Pires, R., Andrade, C. and Taborda, R., 2011. Evolution stages of an ephemeral inlet immediately after artificial opening. Journal of Coastal Research, SI 64 (Proceedings of the 11th International Coastal Symposium), 1453 - 1456. Szczecin, Poland, ISSN 0749-0208 The study of inlet morphology i...
Article
Full-text available
The morphodynamic evolution of the barrier/inlet of Santo André and relationships between tidal prism and morphological parameters of the inlet were analyzed through seventeen topo-bathymetric surveys. Following the artificial opening of the inlet (March 9, 2009) a prolonged ebb occurred, currents peaking at 6 m/s and excavating a linear V-shaped c...
Article
Full-text available
The complex interaction between morphogenetic processes acting on rocky coasts and substrate characteristics difficult the assessment of its evolution at different time scales. In opposition to other coastal environments such as beaches, where variations on substrate's attributes are constrained to a few possibilities, rocky coasts expose substrate...
Conference Paper
The complex interaction between morphogenetic processes acting on rocky coasts and substrate characteristics difficult the assessment of its evolution at different time scales. In opposition to other coastal environments such as beaches, where variations on substrate's attributes are constrained to a few possibilities, rocky coasts expose substrate...
Article
Full-text available
The present study documents the poorly-described hydro-sediment dynamics of narrow bedrock-controlled estuaries during periods of low-river discharge. The results also contribute to assess the geomorphological evolution of these systems, when affected by drastic flow regulation. The Guadiana Estuary is a narrow rock-bound mesotidal estuary, 80 km i...
Article
Full-text available
This paper compares several methodologies used to compute skin-friction shear stresses and drag coefficients using different methods and equipments: a set of pressure transducers, an acoustic Doppler velocimeter (ADV) and an acoustic Doppler profiler (ADP). The study area is the Ancão Inlet (Ria Formosa, Southern Portugal), an inlet with a mixed wa...
Conference Paper
Full-text available
The study focuses on the western end of the Ria Formosa in Portugal. This evolving sedimentary system comprises barrier islands and three contrasting and connected inlets: Ancão (relocated in 1997 and ebb tide-dominated), Faro-Olhão (opened and stabilised between 1927 and 1958, flood tide-dominated) and Armona (natural and ebb tide-dominated). The...
Article
Research into the response of coastlines to the opening and stabilisation of inlets has been limited by the availability of suitable data, the shortcomings of existing formulae when applied to different inlets, and the difficulties particular to multi-inlet situations. Our appraisal of methodologies for studying inlet dynamics leads us to formulate...
Article
Management of the interactions between social/economic interests and the coastal environment requires practical, interdisciplinary assessment techniques. Backbarrier systems are critical natural resources that provide both economic and social benefits. Activities such as aquaculture, fishing, shipping and port activities, sediment mining, salt extr...
Conference Paper
Full-text available
Ancão Inlet (Southern Portugal) was relocated in 1997 and almost 10 years after its opening has the morphodynamic characteristics and migration pattern predicted by several authors. Its eastwards migration is mostly caused by high W-SW storm events, where the downdrift migration of the channel is accompanied by updrift spit growth and both deltas m...
Article
Full-text available
Uncontrolled dredging in complex environments such as barrier island systems can produce major changes in inlet conditions, current circulations patterns and modify channel margins, leading to silting or erosion. This paper presents a study of the evolution of Faro Channel between 1927 and 2001, in the Ria Formosa barrier island system, taking into...
Article
Determination of inlet hazard areas (IHAs) is important for the management of barrier island systems such as the Ria Formosa. An IHA is an area of natural importance that can be easily destroyed by inlet-related processes and covers the land adjacent to inlets [CAMA, 2004. Handbook for Development in Coastal North Carolina. Division of Coastal Mana...
Conference Paper
Full-text available
Inlet opening greatly modify the nearshore and bay morphology, as well as both updrift and downdrift shorelines. This paper analyses the evolution of the downdrift coast as response to the opening and stabilisation of an inlet at south Portugal. The inlet opening and stabilisation was responsible by two major effects on the downdrift coast: (1) dra...

Questions

Question (1)
Question
Looking for MatLab scripts on inversion algorithms of Landsat8 images to bathymetric maps using known depths and water quality parameters (based on know bibliography i.e Stumpf & Holderied 2003; Albert & Mobley, 2003). Also, suggestions on possible problems on applying the technique (e.g. atmospheric corrections, calibration curves, amongst others). Thanks

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Projects

Projects (7)
Project
Improving the sustainable water management in Culatra Island: Promoting measures for water circularity; Implementing alternative sources of water for non-potable uses; Dissemination of nature-based solutions; Empowering people for efficient usage of water.
Project
The objectives are twofold: (1) use the existent solar PV generation and surplus energy stored on the battery system to improve the water desalination process; and (2) reduce the potable water usage and required energy to pump water from inland to the island by producing non potable water to be used on the fishing activities (e.g. ice production, cleaning fishing gear) and community gardening. In order to accomplish those objectives, we will build a storage tank, use the existing solar PV generation to pump the salt water, desalinate water using a serpentine circuit and increase the production yields of fresh water by accelerating the process using solar thermal supplied by the also existent energy storage system.
Project
To characterize the fortnightly switching of residual flow drivers (barotropic and baroclinic) in a type of estuaries that has been largely unexplored.