1,721,101 research outputs found
Sediment transport pattern and coastal evolution at lido di dante beach, Adriatic Sea
No full textInter-disciplinary medium term monitoring of a small coastal cell of the Northern Adriatic, Lido di Dante Beach, was undertaken starting from 2001. In association with the EU-CoastView Project, coastal state indicators were developed and surveyed. This paper presents the observations done during 3 years of surveys: beach morphodynamics, intertidal bars, dune morphology and vegetation, overwash observation and risk. Results evidence two areas with different dynamics: the Southern part of the beach is dependent on the Bevano River by-pass processes and all indicators are positive (stable vegetation, large beach) while the Northern part is very narrow, eroding (10m/year) and the dune is easily overwashed. This atypical behavior is though to be due to the groin that disturbs the protective function of the nearshore bar system. Copyright ASCE 2006
Valutazione della variazione della linea di riva nell’area di Lido di Dante (RA) tramite GIS e monitoraggio con DGPS cinematico
No full textThe back-barrier wetland system of Vendicari (SR): prediction of dune overwashing using shoreline variability indicators
No full textNearshore bars as a natural protection of beaches, field evidences from Lido di Dante beach, Adriatic Sea
No full textAnIntegrated Study of ShorelineVariability Using Gis andARGUSTechniques
No full textInternational audienceGIS techniques (Arcview) were used to study the long term (last 20 years) shoreline variation in the area of Lido di Dante, Ravenna, northern Italy. The shoreline was identified on the photos as the High Water Line on 4 flights (1978, 1982, 1996, 1998). Evaluation of the error associated to the method (tidal range) indicates an horizontal variability of HWL in the order of 10-30 m, according to the beach slope typical of the different parts of the beach. This means that GIS techniques can be only used as a qualitative instrument for long-term assessments, as on short periods thenoise can be high. In any case, the coastline can be broadly described by two segments: one in erosion affected by the presence of structures and one quite stable, dominated by natural process. To assess the correctness of the data extracted from the GIS, topographic surveys were carried out with a GPS in kinematic relative positioning and a total station. These surveys revealed that the area is eroding in the northern part, is oscillating in the central part and is in oscillation/accretion in the southern one. An ARGUS station was installed in the area. Short-term (hours) shoreline surveys were carried out to compare the GPS data with the ARGUS ones after putting them in a GIS. This comparison revealed that the ARGUS and GPS shorelines are identified with a precision which is comparabl
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Les embouchures Mesotidales (tidal inlets) et leur relation avec les littoraux adjacents - Exemple de la Barra Nova, Sud Portugal.
Full text linkL'évolution d'une embouchure tidale dépend de l'équilibre dynamique entre les processus littoraux sur les côtes adjacentes et la barrière hydraulique que représente le chenal de marée. L'objectif de ce travail était de quantifier l'influence de ces différents paramètres afin de comprendre et prédire la morphodynamique du site de la Barra Nova sur le système d'îlesbarrières de la Ria Formosa (Sud Portugal). Les mesures de morphodynamique (bathymétries, vidéo), d'hydrodynamique et de dynamique sédimentaire (traçages) ont permis de quantifier l'évolution de cette embouchure en déterminant les processus hydrosédimentaires sur le littoral adjacent, et la réponse du système aux variations climatiques. Un schéma conceptuel est proposé, basé sur la compréhension de la morphodynamique à court terme et sur l'enregistrement vidéo à moyen terme. Ce nouveau concept, qui explique l'évolution saisonnière de la Barra Nova, met en évidence les facteurs responsables de la migration historique de cette embouchure.Tidal inlets are among the most dynamic morphological features along the world coastlines. Their evolution and stability, frequently critical to the local environment, are dependent on the relative influence of longshore transport along adjacent coasts and tidal flows in the inlet. Main objective of this study was to quantify the processes involved in the inlet morphodynamics in order to determine the key parameters of these systems and to predict medium to long-term evolution. Morphology evolution (bathymetry, remote sensed video data), hydrodynamics and sediment transport measurements were analyzed to quantify the inlet dynamics. Our approach was based on the study of hydrosedimentary processes along the adjacent coastline, and inlet responses to environmental variations (mainly seasonal). A conceptual model is proposed, based on the understanding of short-term morphodynamics of the system, and medium to long-term video information. This new model, explaining the seasonal evolution of the Barra Nova, points out the processes responsible for the historical migration of this tidal inlet
Tidal inlets and adjacent coasts - Example of the Barra Nova inlet, south Portugal
No full textTidal inlets are among the most dynamic morphological features along the world coastlines. Their evolution and stability, frequently critical to the local environment, are dependent on the relative influence of longshore transport along adjacent coasts and tidal flows in the inlet. Main objective of this study was to quantify the processes involved in the inlet morphodynamics in order to determine the key parameters of these systems and to predict medium to long-term evolution. Morphology evolution (bathymetry, remote sensed video data), hydrodynamics and sediment transport measurements were analyzed to quantify the inlet dynamics. Our approach was based on the study of hydrosedimentary processes along the adjacent coastline, and inlet responses to environmental variations (mainly seasonal). A conceptual model is proposed, based on the understanding of short-term morphodynamics of the system, and medium to long-term video information. This new model, explaining the seasonal evolution of the Barra Nova, points out the processes responsible for the historical migration of this tidal inlet.L'évolution d'une embouchure tidale dépend de l'équilibre dynamique entre les processus littoraux sur les côtes adjacentes et la barrière hydraulique que représente le chenal de marée. L'objectif de ce travail était de quantifier l'influence de ces différents paramètres afin de comprendre et prédire la morphodynamique du site de la Barra Nova sur le système d'îlesbarrières de la Ria Formosa (Sud Portugal). Les mesures de morphodynamique (bathymétries, vidéo), d'hydrodynamique et de dynamique sédimentaire (traçages) ont permis de quantifier l'évolution de cette embouchure en déterminant les processus hydrosédimentaires sur le littoral adjacent, et la réponse du système aux variations climatiques. Un schéma conceptuel est proposé, basé sur la compréhension de la morphodynamique à court terme et sur l'enregistrement vidéo à moyen terme. Ce nouveau concept, qui explique l'évolution saisonnière de la Barra Nova, met en évidence les facteurs responsables de la migration historique de cette embouchure
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