11.5 Clastic Sediment, Distribution
b :
..
" " ,
,
I
I
I
\
\ OUTER',
, SHELF '
,
I
WAVE ~
:
APPROACH
~
~ •
J
J
I
,
,
,
I
I
J
•
0
'" ,
I
SHELF
BREAK
0
0
,
J
I
I
PRODELTA
~
\
\
521
c
5 km
~
RATES OF DEPOSITION
d
__ '~~~~~' __ ~~'~~~~JO
CONT.
SLOPE
OUTER
SHELF
PRODELTA
SLOPE
DELTA
FRONT
BEACH RIDGES
o
N
DELTA FRONT
0..
o o rn
~ Ir
N >e
PRODELTA
SLOPE
...........
0 .8 · 1·
,
,
30 km
Fig. 11.25. Holocene pro gradation oftwo lobate deltas with their adjacent coastlines in Italy. a Location
map of river Po, some of his tributaries, and river
Tiber. b Development of Po delta during the past
2500 years (time period for mass balance); older and
younger coastlines are not shown; the modem Po
delta formed during the last 250 to 400 years. (After
10 km
200 m
Bondesan et al. 1995, modified). c Tiber delta, dated
historical sites and beach ridges as weIl as (generalized) hydrodynamic regime of the pro delta area.
d Site of most rapid deposition on pro delta slope.
e Cross-section of Tiber delta demonstrating Holocene transgressive and highstand systems tracts. (After Bellotti et al. 1994, modified)