This presentation is about the Geomorphological criteria of Bangladesh. It includes mainly land form, rainfall, river phenomenon , natural potentiality.

1. Geomorphologyof BANGLADESH
Presented by:
Muhammad Shafin Islam Alvee
Reg No: 2017333038
Session:2017-18
Dept. of Civil & Environmental Engineering

2. the study of the physical
features of the surface of the
earth and their relation to its
geological structures.
Definition of Geomorphogy:

3. Some rudimentary importance of
Geomorphology
Remote
sence of
scientific
study
about
earth
and it’s
features
Takes a
great
role in
rehabitat
-ional
process
To study
a land
upon
which
structure
reside.
To
understand
the criteria
of prevail
disaster
Of a
certain
area
Soil
erosion
and
protecti-
on
mechan-
ism
Rehavili-
tational
process
Agricultu-
ral
study

4. Landscape
of
BANGLADESH
The physical geography of Bangladesh is
varied and has an area characterized by
TWO distinctive features.
A broad
plain
land
subjecte
d to
Frequen
t
flooding
A small
hilly
region
crossed
by
swiftly
flowing
rivers

5. Deltaic plan
Ganges flood plain
Atrai flood plan
Brahmaputra Jamuna flood land
Old Brahmaputra flood plain
Meghna flood plain
Hilly region
Chittagong hill tracks
Hill ranges of
northestern Sylhet
Hill along the narrow strip
of Sylhet and Mymensingh

6. RAINFALLcharacterstics
Bangladesh generally
enjoys a sub-tropical
monsoon climate. The
annual rainfall varies
from 1400 mm to 4500
mm and national
average is 2427 mm.
More than 70% of the
total rainfall of the
country occurs during
monsoon .

7. River Erosion
Riverbank Erosion an
endemic and recurrent
NATURAL HAZARD
in Bangladesh.
When rivers enter the
mature stage (as in the
case with the three
mighty rivers, Ganges,
Brahmaputra and
Meghna) they become
sluggish and meander or
braid. These oscillations
cause massive
riverbank erosion.

8. River
flow
directions
Bangladesh is
a riverine country. About 700
rivers including tributaries
flow through the country
constituting a waterway of
total length around 24,140
kilometres (15,000 mi).Most
of the country's land is
formed through silt brought
by the rivers. Bangladesh
geography and culture is
influenced by the riverine
delta system. Bangladesh lies
in the biggest river delta of
the world - the Ganges
Delta system.
The map shows the major rivers of BANGLADESH

9. A phenomena about
BRAHMAPUTRA
Early accounts give its name as Dyardanes.In the past, the
course of the lower Brahmaputra was different and passed
through the Jamalpur and Mymensingh districts. Some
water still flows through that course, now called the Old
Brahmaputra, as a distributary of the main channel.
A question about the river system in Bangladesh is when
and why the Brahmaputra changed its main course, at the
site of the Jamuna and the "Old Brahmaputra" fork that
can be seen by comparing modern maps to historic maps
before the 1800s. The Brahmaputra likely flowed directly
south along its present main channel for much of the time
since the last glacial maximum, switching back and forth
between the two courses several times throughout
the Holocene idea about the most recent avulsion is that
the change in the course of the main waters of the
Brahmaputra took place suddenly in 1787, the year of the
heavy flooding of the river Tista.
A SATELLITE FOOTAGE OF BRAHMAPUTRA

10. Earthquake Phenomenon
Accurate historical information on earthquakes is very important
in evaluating the seismicity of Bangladesh in close coincidences
with the geotectonic elements. Information on earthquakes in and
around Bangladesh is available for the last 250 years. The
earthquake record suggests that since 1900 more than 100
moderate to large earthquakes occurred in Bangladesh, out of
which more than 65 events occurred after 1960. This brings to
light an increased frequency of earthquakes in the last 30 years.
This increase in earthquake activity is an indication of fresh
tectonic activity or propagation of fractures from the
adjacent seismic zone.
Before the coming of the Europeans, there was no definite record
of earthquakes. Following is a chronology of important
earthquakes from 1548.

11. Bangladesh is a pleasing country with natural
beauties. There are a number of amazing tourist
spots in Sylhet and in Chittagong division.
Particularly the waterfalls, fountains, hills, green
dense forests and the villages of the tribal people
are the main attractions.Some of them are:Hum-
hum waterfall, Nafa-khum fountain,Jadipai
fountain
Fountains
FOUNTAINS and LAKES
LAKES
Bangladesh possesses enormous area of wetlands
including rivers and streams, freshwater lakes and
marshes, HAORS, BAORS, BEELS, water storage RESERVOIRS,
fish ponds, flooded cultivated fields and estuarine
systems with extensive mangrove swamps. Lakes are
deeper perennial waterbodies. Swamp forests develop
along the margins of beels, marshes and lakes.

12. THANKS