Abstract
The Central Algerian coast, between Cap Matifou in the East and Cap Djinet in the West
is characterized by a very dynamic and complex coastal area, which allows studying and better
understanding the impact of anthropic and natural processes on sediment dynamics.
During these last years, the coastal of the bay of Zemmouri was exposed to many
constraints related to the human activities, such as the abusive extraction of sand in the beaches
(beache of Zemmouri, beach of Mandoura) that of the beds of wadis (wadi of Isser, wadi of
Corso,,,,,). This situation gives this coastal a high vulnerability to coastal risks. The main
objectives of this research is to study the coastal geo-hazards, among which we cite: coastal
erosion, marine flooding.
In the morphodynamic context, the results of the morphodynamic parameters of the sandy
beaches show a more or less intermediate comportment along the coast of Zemmouri.
The spatio-temporal evolution of the shoreline during the period (1980 -2017), allows to
have that the erosion is more important in the Eastern part than the Western and Central part.To
had better understand the mechanisms at the origin of erosion, a complementary study on the
classification of beaches was carried out. Then a study on the spatio-temporal evolution of the
seabed. In order to have an idea on the morpho-hydro-sedimentary functioning of the bay of
Zemmouri.
For the hydro-sedimentary context, we have used a Mike 21 numerical and Arc Gis
mapping software. The results of this model show that the underwater morphology of the
continental shelf of the bay of Zemmouri is characterize by relatively irregular seabeds; this
model also showed that the study area is submit to the influences of swells of sectors 315°N,
45°N and 360°N.
The cartography of the coastal vulnerability with regard to the sea level rise has permitted
to define and identify the coastal risk areas. The results show that 24, 58 km of the Zemmouri
coastline, i.e. 52 %, presents a high to very high vulnerability.
The mapping of marine flooding is based on the use of the method of Hoozemans et al. 1993.
The principal results of the simulation of the phenomenon of marine flooding show that the
land most affected by the maximum level of flooding (5 to 6 m) is essentially the low-lying
coasts (the beaches and wadi beds).
Coastal erosion and marine flooding are constraints that must be integrated into coastal
strategies and plans.
Keywords :
coastal risks, hydro-sedimentary, marine flooding, erosion, Zemmouri.
The Central Algerian coast, between Cap Matifou in the East and Cap Djinet in the West
is characterized by a very dynamic and complex coastal area, which allows studying and better
understanding the impact of anthropic and natural processes on sediment dynamics.
During these last years, the coastal of the bay of Zemmouri was exposed to many
constraints related to the human activities, such as the abusive extraction of sand in the beaches
(beache of Zemmouri, beach of Mandoura) that of the beds of wadis (wadi of Isser, wadi of
Corso,,,,,). This situation gives this coastal a high vulnerability to coastal risks. The main
objectives of this research is to study the coastal geo-hazards, among which we cite: coastal
erosion, marine flooding.
In the morphodynamic context, the results of the morphodynamic parameters of the sandy
beaches show a more or less intermediate comportment along the coast of Zemmouri.
The spatio-temporal evolution of the shoreline during the period (1980 -2017), allows to
have that the erosion is more important in the Eastern part than the Western and Central part.To
had better understand the mechanisms at the origin of erosion, a complementary study on the
classification of beaches was carried out. Then a study on the spatio-temporal evolution of the
seabed. In order to have an idea on the morpho-hydro-sedimentary functioning of the bay of
Zemmouri.
For the hydro-sedimentary context, we have used a Mike 21 numerical and Arc Gis
mapping software. The results of this model show that the underwater morphology of the
continental shelf of the bay of Zemmouri is characterize by relatively irregular seabeds; this
model also showed that the study area is submit to the influences of swells of sectors 315°N,
45°N and 360°N.
The cartography of the coastal vulnerability with regard to the sea level rise has permitted
to define and identify the coastal risk areas. The results show that 24, 58 km of the Zemmouri
coastline, i.e. 52 %, presents a high to very high vulnerability.
The mapping of marine flooding is based on the use of the method of Hoozemans et al. 1993.
The principal results of the simulation of the phenomenon of marine flooding show that the
land most affected by the maximum level of flooding (5 to 6 m) is essentially the low-lying
coasts (the beaches and wadi beds).
Coastal erosion and marine flooding are constraints that must be integrated into coastal
strategies and plans.
Keywords :
coastal risks, hydro-sedimentary, marine flooding, erosion, Zemmouri.