Geoscience Reference
In-Depth Information
Fig. 16.5
Seabed map of the nearshore zone of the Curonian Spit. Sedimentation environment:
1
-
3,
lagoon:
1,
mud accumulation;
2,
wave sand accretion;
3,
erosion;
4
-10 - marine:
4,
wave and
current accretion;
5,
wave accretion;
6,
unstable accumulation and transit;
7,
periodic alteration
of erosion/accretion processes;
8,
transit;
9,
weak erosion;
10,
intense erosion;
11
-
15,
lithological
types of sediments:
11,
boulders, pebbles, gravel with sands;
12,
pebbles, gravel with sands;
13,
sands;
14,
silty clay mud;
15,
outcrops of dense clay deposits, partly covered by sands
lengths of some troughs exceed 100 m, with an average width of about 4-5 m
by longshore sediment transport. In the vicinity of Lesnoy and further to the north,
there are practically no sandy sediments on the bottom surface. Boulder-pebble
layer or extensive outcrops of greenish gray organic-rich laminated dense clays,
partly covered by sand, were mapped offshore at depths from 5 to 15 m. Hence, ero-
sion processes dominate within this area. Along the northern coast of the Sambian
Peninsula between the Cape Taran and 25-28 km of the Curonian Spit, the value of
Along the western coast of the Sambian Peninsula, sediment deficit is observed
extremely high level of coastal retreat showing an annual volume of land loss by
16.4.2.3 Slope Slides
Landslides reach a very hazardous level in the Kaliningrad area. Huge landslides
They cause the loss of hundreds of square meters of land annually. Since 2000, the
stability of the Kaliningrad coastal zone has deteriorated. In many areas, the plant
cover of the slopes has been destroyed and the slope steepness of potential landslide
areas has increased up to emergency levels. As a result, landslides have become
more frequent. Nowadays, there are some coastal areas where a risk of building