unlocking the mysteries of beach erosion by studying the surveys conducted in coastal areas and steps to reduce it.

1. WELCOME EVERYONE

2. Unlocking the
mysteries of
“beach erosion”

3. This study achieves the goals of
determining…
• The direction in which sand moves along the shoreline
& why.
• How this migration is affected by our influences such as
beach groins, river jetties.
• The causes of current & past major episodes of beach
erosion
• What might be done to solve beach erosion .

4. BEACH EROSION
IT’S OCCURANCE

5. What Is Beach Erosion?
♦ wearing away of land and the removal of beach
or dune sediments
♦ Takes place by tidal currents, drainage or high
winds
♦ which take the form of long term losses of
sediments and rocks

7. NATURAL INFLUENCES:

9. Plum Island Beach Sand
Erodes & Accretes (gathers),
wind …
& water…
at the direction of
the forces exerted
by…

10. Between the high & low tide lines and below
the water, wave action moves sand…
Photo:Photo: Clark Little,Clark Little, Surfer MagazineSurfer Magazine
This is especially true at Plum Island as
it is a wave & tide dominated beach
Small waves move sand along the shore but
ultimately leave it behind upon the beach.
Large waves remove sand from the beach to the near shore
shallows & continue to move it along near shore, but underwater.

11. Above the water, wind moves sand that isn’t
stored by vegetation, roots, debris,
beach fences & dunes…

12. ……along the beach,along the beach,
Erosion occurs when
sand withdrawals
exceed deposits…
…and when the sand
reserves of the barrier
dune system are depleted.

14. PLOT BETWEEN RATES OF
EROSION & ACCRETION

16. Human
Influences

17. HOW DO PORTS AND OUTER HARBORS
CAUSE EROSION?
♦ alteration of sedimentation patterns may
lead to accretion or erosion of a beach
♦ Majority of Ports and Harbors are causing
large scale Coastal Erosion.
EFFECTS OF IT:
♦ Loss of coastal habitats

18. ♦ Loss of freshwater
and food
resources.
♦ Increased
Vulnerability
♦ Socio-economic
loss.
♦ Unsustainable
development
Erosion Hot
Spots

22. ESTUARIES

23. ESTUARIES:
♦ An estuary is a partially enclosed coastal
body of brackish water with one or more
rivers or streams flowing into it and with a
free connection to the open sea.
♦ Estuaries form a transition zone between the
river environments and the maritime
environments.

27. IMPACTS OF EROSION:
♦ Property loss
♦ Tourism
♦ Environmental Degradation
♦ Historical Sites

28. BEFORE (1980s) AFTER (2000+)
Beach fully Eroded
IMPACTS OF EROSION

30. 100 m
Pond Citizens’ Action Network – July 2009

31. DUMPING ROCKS IS NOT A SOLUTION
• Increases erosion and transfers problem down the
coast

32. • Has to continue
forever as rocks
keep sinking
• Requires huge
sum of public
money

33. Does not protect us from big
waves
Mountains have to be
destroyed
This is NOT sustainable!

36. DO U KNOW FROM HOW
MANY YEARS VIZAG IS
FACING EROSION?

37. SINCE 20 YEARS..........
It has become severe in vizag
since aug 2007 after the
construction of the
“gangavaram port”.

40. HARD-EROSION CONTROLS
♦ provide a more permanent
solution than the former
♦ Seawall and groyne serve
as permanent
infrastructure.
♦ The average life span of a
seawall is 50–100 years
and the average for a
groyne is 30–40 years.

44. SOFT-EROSION CONTROLS
♦ refers to temporary options of slowing the effects
of erosion.
♦ Options includes sandbag,creepers and beach
nourishment.
♦ not intended to be long term or permanent
solutions.
♦ One of the most common methods is beach
nourishment projects.

45. GROWTH OF
CREEPERS IN BEACHES
YOU WOULD HAVE
NOTICED THIS IN
VIZAG BEACH IN OUR
CHILDHOOD

47. Beach nourishment
• Companies like DCI are currently appointed in
Vizag and other places
• These projects involve dredging sand and moving
it to the beaches .

49. IN 2003 SAND NOURISHMENT HAS SHOWN POSITIVE RESULTS
Before Nourishment After Nourishment

50. FORMATION OF
ISLANDSDURING
DREDGING

52. RELOCATION
♦ Under this response, humans move from the coast
and surrender the coast to the natural processes of
sea level rise and erosion.
♦ By removing structures along the oceanfront, the
beach is surrendered to the natural forces of the
ocean.
♦ This would be most effective in reducing the
impacts of erosion on human society.

54. GEO TUBES:
♦ These are cylindrical shaped tubular
structures.
♦ These are filled with sand, collected from
the same place where it is need to be
placed.
♦ These are not so expensive.

56. “Nature never deceives us;
it is we who deceive ourselves.”
~ Jean Jacques Rousseau

57. AS AN INDIVIDUAL
WHAT CAN WE DO ?

58. Step 1

59. Step 2

61. Young Fraternity India (YFI)

62. Step 3

63. Step 4

66. THANK YOU ALL SKYPIES

67. FOR MAKING OUR
PRESENTATION SUCCESFULL

68. REFERENCE

70. Any queries