Résumé
191
Fig. 12Shoreline evolution between 1957 and 2017 in the overall study area, (erosion and
accretion) computed by the End Point Rate (EPR) (Figuier to Zemmouri)
- The coastline of Cap Djenat
From Zemmouri to Cap Djenat, we record in this sector a relatively progressive fattening of
the beach from 1957 to 1973. This gain in the beach is variable and reaches by place the 45
meters at the level of the stations of Djenat beaches 01 and 02. To the west of the thermal
station, we pass from a sector that was in fattening to a zone in erosion; net retreats of about
46 meters and 109 meters are recorded respectively at the level of the station's Mazer East and
West. From 1973 to 1980, an apparent retreat of the coastline is recorded at all stations
(locally more than 5 meters per year). From 1980 to 2017, a strong recession of the coastline
reaching or exceeding locally 5 meters per year is observed at the Djenat 01 and 02 beaches
stations. On the other hand, the accretion of the coast is important at the level of the stations
of the beach Djenat Familial (locally more than 2 m / year). This change in the coastline
evolution occurred following the establishment of the port of Djenat in 2009 (see Fig.14),
which has modified the sedimentary transit in this area.The net rate of change of the coastline
between 1957 and 2017 was strong and contrasted from one site to another, and we note an