the southern part of the Mamaia beach. Low permeability longitudinal dams were
positioned at 450–500 m from the shore at a depth of about 5 m, on sections of
250 m, with distances between the dams of 250–400 m (Spataru 1996). This
protection system proved its efficiency up to 5 or 6 years. Current work as subject
of a short, medium and long-term Protection Plan (started in 2015 as far as 2020 and
after) along the Romanian coast, includes short and medium – term protection
measures for Mamaia sand barrier.
8.2 Method
Sediment samples (56) were collected in 2012 on 7 transects from Mamaia Bay: on
the backshore zone 14 samples (upper and medium position of beach), on the swash
zone 7 samples, on the surf zone 21 samples (depth of 1 m, 3 m and 5 m) and on the
nearshore zone 14 samples (depth of 7 and 10 m) (Fig. 8.1b). Sediment analyses
were carried out to analyze the grain size of the sediments (Anastasiu and Jipa 1983,
Jipa 1987, Blott and Pye 2001) using the standard of dry sieving techniques (1/3 phi
sieving interval). Data were statistically analysed according to Folk and Ward
formulae (1957), in terms of mean grain size (mean), standard deviation (sorting),
skewness and qurtosis. The classification between coarser and finer particles was
based on Wentworth’s scale (1922).
8.3 Results
The beach, which develops in Mamaia Bay is a geological formation that was
formed recently, primarily from the contribution of terrigenous longshore sediments, with mainly north – south direction and secondary organogenous sediments,
which are transported to the backshore, mainly by transversal conveying on land
(onshore – offshore).
It is well known that in the nearshore area the wave regime is influenced by local
geomorphological configuration of the beach shoreline, marine relief and the
coastal and marine hydraulic structures. In this context, there are several medium
wave actions in the offshore area, the transformation of waves, surf, swash and
backshore. The boundaries of these sectors are highly mobile and determined by the
sea state.
8.3.1 Backshore Zone
Backshore area is the beach which extends from the base of dunes or limit of the
forward waves on the backshore under stormy conditions until the swash zone. The
8 Granulometry of Sediments in the Mamaia Bay Area
135
positioned at 450–500 m from the shore at a depth of about 5 m, on sections of
250 m, with distances between the dams of 250–400 m (Spataru 1996). This
protection system proved its efficiency up to 5 or 6 years. Current work as subject
of a short, medium and long-term Protection Plan (started in 2015 as far as 2020 and
after) along the Romanian coast, includes short and medium – term protection
measures for Mamaia sand barrier.
8.2 Method
Sediment samples (56) were collected in 2012 on 7 transects from Mamaia Bay: on
the backshore zone 14 samples (upper and medium position of beach), on the swash
zone 7 samples, on the surf zone 21 samples (depth of 1 m, 3 m and 5 m) and on the
nearshore zone 14 samples (depth of 7 and 10 m) (Fig. 8.1b). Sediment analyses
were carried out to analyze the grain size of the sediments (Anastasiu and Jipa 1983,
Jipa 1987, Blott and Pye 2001) using the standard of dry sieving techniques (1/3 phi
sieving interval). Data were statistically analysed according to Folk and Ward
formulae (1957), in terms of mean grain size (mean), standard deviation (sorting),
skewness and qurtosis. The classification between coarser and finer particles was
based on Wentworth’s scale (1922).
8.3 Results
The beach, which develops in Mamaia Bay is a geological formation that was
formed recently, primarily from the contribution of terrigenous longshore sediments, with mainly north – south direction and secondary organogenous sediments,
which are transported to the backshore, mainly by transversal conveying on land
(onshore – offshore).
It is well known that in the nearshore area the wave regime is influenced by local
geomorphological configuration of the beach shoreline, marine relief and the
coastal and marine hydraulic structures. In this context, there are several medium
wave actions in the offshore area, the transformation of waves, surf, swash and
backshore. The boundaries of these sectors are highly mobile and determined by the
sea state.
8.3.1 Backshore Zone
Backshore area is the beach which extends from the base of dunes or limit of the
forward waves on the backshore under stormy conditions until the swash zone. The
8 Granulometry of Sediments in the Mamaia Bay Area
135