coastal protection measure for control of coastal …old.cwc.gov.in/cpdac-website/cpdac...

COASTAL PROTECTION MEASURE FOR

CONTROL OF COASTAL EROSION AT

PENTHA IN KENDRAPARA DISTRICT,

ODISHA

DEPARTMENT OF WATER RESOURCES

GOVERNMENT OF ODISHA

INTEGRATED COASTAL ZONE MANAGEMENT

PROJECT ( ICZMP) , ODISHA

CONTENTS

2 Introduction

Erosion as observed from time to time

Survey & Bathymetry variations

Revised Design of geo-textile tube embankment

due to effect of very severe cyclone Phailin (Oct 2013).

Revised Alignment & Cost Revision

Revised construction Program & extension of intended period of completion.

Progress photographs

Observations during Hud Hud (12th Oct 14)

DEPARTMENT OF WATER RESOURCES, GoO,

Map of Kendrapara District showing rivers and coast line

DEPARTMENT OF WATER RESOURCES, GoO, PEA

Bairds & Associate, Canada-2002

6

Sea-Facing Saline Embankment in Rajnagar Block

DEPARTMENT OF WATER RESOURCES, GoO,

1. Location of the Project :

The site is near village Pentha of Rajnagar –Gopalpur Saline

Embankment in Kendrapada District of Odisha.

Lat : N-200-32’-22.40” & Long : E -860-47’-16.0”

2. Objective of the Project :

• The objective was to protect the existing embankment, immediate

cultivable land of 6883 Ha, habitation of village Pentha and adjoining

villages from wave action.

• To study the performance of geo-tube embankment including

instrumentation to measure performance under field condition after

installation

3. Problem faced

• Shoreline of Pentha is shifting towards countryside

• In 2005, shore line was 200m away from existing embankment

Present proposal- Construction of Geo-Tube Embankment

DEPARTMENT OF WATER RESOURCES, GoO,

In 2008, shoreline was 20m away from existing old

embankment.

Traditional method of protection using wooden

stump piling and Big Resin PVC sand bag dumping

was done every year.

In the Year 2009-10, a retard embankment was

constructed on the backside of the old

embankment at a distance of 60 metre

In 2011-12, the shoreline over-ran the old

embankment for a length of 400 metre & washed

away the embankment for 350 metre length.

Problem faced: contd…

DEPARTMENT OF WATER RESOURCES, GoO,

Pictures of the site (Construction of retard embankment is made at 60mtr distance from

the old embankment during the Year 2009-10 )

DEPARTMENT OF WATER RESOURCES, GoO, PEA

Bairds & Associate, Canada-2002

DEPARTMENT OF WATER RESOURCES, GoO,

Index Map of area of the Project for protection

DEPARTMENT OF WATER RESOURCES, GoO,

Pictures of the site: (Dt. 25.09.2007)

Shore line 20 metre away from embankment

DEPARTMENT OF WATER RESOURCES, GoO,

Pictures of the site: (Dt. 30.09.2011)

Severely scoured 350 metre length of embankment is protected by sand bags

DEPARTMENT OF WATER RESOURCES, GoO,

Pictures of the site: (Dt. 30.09.2011)

Retard Embankment built @ 60 metre on country side of Old Embankment

DEPARTMENT OF WATER RESOURCES, GoO,

Pictures of the site: (Dt. 30.09.2011)

350 metre length of Embankment fully damaged by high surge & protected by big volume sand bags and bullah piling

DEPARTMENT OF WATER RESOURCES, GoO,

Pictures of the site: (Dt. 20.10.2011)

400 metre length of embankment as protected earlier by sand bags are fully washed by high surge

DEPARTMENT OF WATER RESOURCES, GoO,

Pictures of the site: (Dt. 20.10.2011)

400 metre length of embankment as protected earlier by sand bags

are fully washed by high surge

DEPARTMENT OF WATER RESOURCES, GoO,

Pictures of the site: (Dt. 20.10.2011)

Retard embankment in front of washed zone was protected by sand bags

DEPARTMENT OF WATER RESOURCES, GoO,

DEPARTMENT OF WATER RESOURCES, GoO,

Pictures of the site: (Dt. 11.01.2013)

400 metre length of embankment as protected earlier by sand bags

are fully washed by high surge & retard embankment is exposed to tides

22

In order to protect the coast line at Pentha from vulnerable erosion, Integrated Coastal Zone Management (ICZMP) & Department of Water Resources, Government of Odisha has taken up an up-to-date method of soft engineering technology which includes construction of a geo-textile tube embankment under the assistance from the World Bank.

It is a pilot project in the State of Odisha in which a structural system is to be developed to face wave action creating threat to the existing Rajnagar- Gopalpur saline embankment for long term protection.

Through a NCB Tender, the IIT( Madras) was appointed as Project Consultant. They surveyed the site and prepared the designs of the geo-textile tube embankment

1. The work for construction of the geo-tube embankment

was awarded to M/s Garware Wall Ropes Ltd, Pune for

Rs 3295.93 Lakhs through a NCB Tender process.

2. The Contract was signed on 24.07.2013 for a construction

period of 11 months. The stipulated date of completion

being 23.06.2014. The Drawing was issued.

3. The Contractor mobilized men & machineries to site to

start the work immediately after monsoon i.e. during

October 2013

4. A very-severe cyclone Phailin occurred on 12th October

2013. The shore line at Pentha was severely eroded. The

alignment for embankment and design was to be changed

to fit in to revised site conditions

Embankment as per original approved

drawing (30m base width) 24

Pictures of the site: (Dt. 13.12.2013) : ( After Phailin)

Advancement of shore line encroaching the sectional area of proposed embankment as per original drawing

25

TOPOGRAPHICAL ALIGNMENT OF REVISED

EMBANKMENT WITH L.T.L IN 2011 AND 2013

Modification in design

Work order : 24.07 2013; Phailin Cyclone: 12.10. 2013

Temporary Cofferdam design on 13.11.2013 and construction

on 14.12.2013; Cofferdam partial damage and excavation

difficulty reported on 12.1.2014

Revising the bottom width from 30m to 24m with submitted on

12.2.2014

Revising the bottom width from 30m to 24m with movement

of crane on top of retarded embankment submitted on

2.3.2014

WRD approval of integrated retarded and geo-textile tube

embankment on 13.4.2014

15-Sep-17 ICZMP ORISSA IIT Madras

27

24m base width Revised Design : March 2014

28

Geo tube laying starts after preparation of bed

15-Sep-17 PUL PUSAN IIT Madras INDIA

29

Installation of pumps on a barge to supply water for sand slurry

30

Laying of Geo Tube

31

Filling of Geo Tube

32

Geo tube filling in progress

15-Sep-17 PUL PUSAN IIT Madras INDIA

33

Geo tube filling in progress

34

Two row sheet piles installed in cut off zone for the

most critical length of 100 mtr (RD 80 to 180 m) 35

Sheet pile driving in progress

15-Sep-17 PUL PUSAN IIT Madras INDIA

36

Sheet pile being installed by using vibro hammers

37

Geotube laying completed & to be covered by gabions

38

Geo Tubes covered by Gabions & finished sections

39

Accretion of sand has started in front of Geo Tube

40

GEOTEXTILE TEST PROPERTIES

15-Sep-17 ICZMP ORISSA

IIT Madras 41

SL.NO MATERIAL

PROPERTY

STANDARDS

REFERRED

As per tender

document

As per sample

tests at IIT

MADRAS

1 Weight per meter

length

ASTM D5261 241 g/m2 239.4 g/m2

2 Puncture

strength

ASTM D4833 890 N 1002.1 N

3 Trapezoidal tear

strength

ASTM D4533 Warp-1068 N Warp-1378.5 N

Weft-676 N Weft-935.3 N

4 Apparent

opening size

ASTM D4751 < 0.075 mm < 0.075 mm

5 Tensile strength IS 1969 Warp-65 KN/m Warp-63.8 KN/m

Weft-43 KN/m Weft-47.2 KN/m

6 Tensile

elongation

IS 1969 Warp-23 % Warp-22%

Weft-16 % Weft-19%

WORK COMPLETION & REVISED COST

42 The principal reason for high cost was due to collection of river

sand with a lead of 100 km to be used in filling the geo-tubes.

The rock products were available at a lead of 120 km from the work site.

The length of the Geo tube embankment was revised and reduced from 675 mtr to 505 mtr in consideration of the extra width of beach and a part of old embankment available in front of the geotube embankment the Northen direction.

The Revised cost of the Project is Rs 3,443.52 Lakhs as against the Agreement value of Rs 3,295.93 Lakhs.

The work has been completed by the Contractor by 30. 06. 2016.

43

Sl.

No Items of work Unit

Quantity as per

Agreement

Quantity fully

executed

(30.6. 2016)

1 Geo-Tube Nos. 234 234

2 Z-Type Sheet piling on

toe mound Sqm 1200 1200

3 9mm Rope

gabion boxes Nos 12089 11,996

4 16mm Rope gabion

boxes Nos 7285 7280

44

Observation of performance of the

protection works at Pentha

(i) During severe cyclone Hud Hud (Oct 2014)

(ii) Accretion of sand in front of geo-tube

at present

Damage to shore line on southern side of

Pentha side during Hud Hud on 12.10.14

15-Sep-17 PUL PUSAN IIT Madras INDIA

45

Damage to shore line on southern side of

Pentha side during Hud Hud on 12.10.14

15-Sep-17 PUL PUSAN IIT Madras INDIA

46

During Hud Hud the sea side slope of retard embankment as

protected by rope gabions are not affected at all

15-Sep-17 PUL PUSAN IIT Madras INDIA

47

Accretion of sand has now started in front of Geo Tube

48

Accretion of sand has started in front of Geo Tube

49

Accretion of sand has started in front of Geo Tube

50

15-Sep-17 PUL PUSAN IIT Madras INDIA

51

15-Sep-17 PUL PUSAN IIT Madras INDIA

52

15-Sep-17 PUL PUSAN IIT Madras INDIA

53

DEPARTMENT OF WATER RESOURCES, GoO, PEA

Bairds & Associate, Canada-2002

15-Sep-17 PUL PUSAN IIT Madras INDIA

55

15-Sep-17 PUL PUSAN IIT Madras INDIA

56

15-Sep-17 PUL PUSAN IIT Madras INDIA

57

Sea-Facing Saline Embankment in Rajnagar Block

15-Sep-17 PUL PUSAN IIT Madras INDIA

59

DEPARTMENT OF WATER RESOURCES, GoO, PEA Breach occurred during Hudhud Cyclone at Satabhaya

Bairds & Associate, Canada-2002

DEPARTMENT OF WATER RESOURCES, GoO, PEA Rajnagar-Gopalpur Saline Embankment Slope failure due to

high tide

Bairds & Associate, Canada-2002

Bairds & Associate, Canada-2002

DEPARTMENT OF WATER RESOURCES, GoO, PEA

Rajnagar-Gopalpur Saline Embankment Slope failure due to high tide

DEPARTMENT OF WATER RESOURCES, GoO, PEA

Bairds & Associate, Canada-2002

DEPARTMENT OF WATER RESOURCES, GoO, PEA Keradagada-Altanga Saline Embankment Slope failure due to

high tide

THANK YOU SIR 64

Presented by :

Er. Jugal Kishore Tripathy,

Chief Construction Engineer,

Rengali Right Irrigation Project.

Department of Water Resources,

Government of Odisha.