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Pirazzoli, P. A.-Les littoraux., 1993
No full textLerat Serge. Pirazzoli, P. A.-Les littoraux., 1993. In: Cahiers d'outre-mer. N° 196 - 49e année, Octobre-décembre 1996. Vietnam. p. 435
Wind and atmospheric pressure in Venice in the 20th Century: a comparative analysis of measurements from the meteorological stations of the Seminario Patriarcale (1901-1955) and the Istituto Cavanis (1959-2000)
No full textPirazzoli, P. A.-Les littoraux., 1993
No full textLerat Serge. Pirazzoli, P. A.-Les littoraux., 1993. In: Cahiers d'outre-mer. N° 196 - 49e année, Octobre-décembre 1996. Vietnam. p. 435
Origin and Holocene Evolution of a Slightly Submerged Tidal Notch in the NE Adriatic
Full text linkA puzzling, slightly submerged, single tidal notch has been reported from the carbonate coasts of the northeastern Adriatic Sea. This paper attempts to explain the origin and the recent evolution of this marine erosion feature and the reasons for its uniqueness in the late Holocene. After reviewing how tidal notches are usually formed, a comparison of recent measurements of bioerosion rates carried out in the area show that when the contribution of dissolution processes can be neglected, bioerosion rates of the deepening of tidal-notch profiles appear to be very low (often <0.1 mm/y) along the coasts of Istria, in contrast to higher rates (between 0.2 and 1.0 mm/y) generally reported in other Mediterranean areas. Such a low rate of bioerosion implies a long period favourable to tidal-notch development. Several glacial isostatic adjustment computations show that relative sea level changes in the area during the last few millennia may correspond to a period of equilibrium between the regional tectonic subsidence and hydro-isostatic emergence during which relative sea level changes were limited, permitting development of the tidal notch observed. The submergence of the notch is consistent with a coseismic subsidence in late Roman time. After this, a new tidal notch could not form at the present sea level because of the limited amount of local bioerosion and the relatively large rate of sea level rise
Sea-level and surges in the Adriatic area: recent trends and possible near-future scenarios.
No full textSea Surges in Camargue: Trends over the 20th century.
No full textContinental Shelf Research 27 (2007) 922–934
Sea surges in Camargue: Trends over the 20th century
A. Ullmanna,b,, P.A. Pirazzolic, A. Tomasind,e
aUFR des Sciences Ge´ographiques et de l’Ame´nagement, Universite´ d’Aix-Marseille I, Aix en -Provence, France
bCEREGE—UMR 6635, Aix en Provence, France
cCNRS-Laboratoire de Ge´ogrphie Physique, 1 place Aristide Briand, 92 195-Meudon, France
dCNR-ISMAR, Venezia, Italy
eUniversita` di Venezia, Venezia, Italy
Received 8 November 2005; received in revised form 24 November 2006; accepted 4 December 2006
Available online 25 January 2007
Abstract
The vulnerability to short-term and long-term sea-level rises is particularly high in subsiding deltaic areas, especially in
microtidal seas, when surges (the differences between the observed sea heights and the simultaneous astronomical tide) are
frequent. At the Grau-de-la-Dent tide-gauge in the Camargue (Rhone delta, France), daily sea-level records are available
since 1905. Hourly tide data spanning the period 1979–1995 were obtained through the digitisation of the original paper
records: the local harmonic constants and the surges for the whole 20th century have been computed from these hourly
observations. It appears that the annual maximum observed sea-level height increases by 4 mm/yr at a rate that is two
times faster than the average observed relative sea level. The increasing trend of the annual maximum positive sea surges
(+1.9 mm/yr), which is equal to the average relative sea-level rise, is thus responsible for this difference. The most
important meteorological factor associated with local sea-surge occurrences is wind blowing from 1001 to 1201 sectors,
which tends to push the water toward the coasts. Since 1961, the frequency and the speed of wind from this sector
increased, although with some variability, thus contributing in part to the increase in the frequency and intensity of the
surges. Due to the changing hydrodynamics phenomenon in the Camargue, a positive feedback mechanism between
extreme marine events and shoreline regression is another factor to explain the sea-surge rise over the long term. The
increase in sea-surge frequency and height during the last century is especially of concern in the deltaic area if the nearfuture
global sea-level rise predicted by climate models is also taken into account.
r 2007 Elsevier Ltd. All rights reserved.
Keywords: Sea level; Surge; Tide; Wind; Flooding risk; Camargue; Rhone delta
1. Introduction
Any rise in sea level will have adverse impacts
such as coastal erosion and flooding, depending on
the time scale and the magnitude of the rise and the
human response to it (Paskoff, 1993). A rise in sea
level may be due to several factors acting on various
time scales, i.e., atmospheric storms (Bouligand and
Pirazzoli, 1999; Pirazzoli, 2000; Trigo and Davies,
2002; Pirazzoli and Tomasin, 2002), river flooding
in estuaries (Svensson and Jones, 2002), but also
land sinking or similar non climate-related changes,
linked to sediment compaction, isostasy, coastal
geomorphologic evolutions or urban development.
ARTICLE IN PRESS
www.elsevier.com/locate/csr
0278-4343/$ - see front matter r 2007 Elsevier Ltd. All rights reserved.
doi:10.1016/j.csr.2006.12.001
Corresponding author. CEREGE, Europoˆ le Me´diterrane´en
de l’Arbois, B.P 80, 13545 Aix-en-Provence, France.
E-mail address: [email protected] (A. Ullmann)
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