I NTEGR EGRATE TED COAST ASTAL L ZONE NE MANAGEM EMENT ENT PROJEC OJECT ( ICZM ZMP) P) , ODISHA SHA COASTAL PROTECTION MEASURE FOR CONTROL OF COASTAL EROSION AT PENTHA IN KENDRAPARA DISTRICT, ODISHA DEPARTMENT OF WATER RESOURCES GOVERNMENT OF ODISHA
CONTENTS Introduction 2 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 (12 th 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
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Sea-Facing Saline Embankment in Rajnagar Block
DEPARTMENT OF WATER RESOURCES, GoO, Present proposal- Construction of Geo-Tube Embankment 1. Location of the Project : The site is near village Pentha of Rajnagar – Gopalpur Saline Embankment in Kendrapada District of Odisha. Lat : N-20 0 -32 ’ - 22.40” & Long : E -86 0 - 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
DEPARTMENT OF WATER RESOURCES, GoO, Problem faced: contd … 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.
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
In order to protect the coast line at Pentha from vulnerable erosion, Integrated Coastal Zone Management (ICZMP) & Department of Water 22 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 27 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 ICZMP ORISSA IIT Madras 15-Sep-17
24m base width Revised Design : March 2014 28
Geo tube laying starts after preparation of bed 29 PUL PUSAN IIT Madras INDIA 15-Sep-17
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 33 PUL PUSAN IIT Madras INDIA 15-Sep-17
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 36 PUL PUSAN IIT Madras INDIA 15-Sep-17
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 SL.NO As per tender MATERIAL STANDARDS As per sample PROPERTY REFERRED document tests at IIT MADRAS 1 ASTM D5261 241 g/m 2 239.4 g/m 2 Weight per meter length 2 ASTM D4833 890 N 1002.1 N Puncture strength 3 ASTM D4533 Warp-1068 N Warp-1378.5 N Trapezoidal tear strength Weft-676 N Weft-935.3 N 4 ASTM D4751 < 0.075 mm < 0.075 mm Apparent opening size 5 Tensile strength IS 1969 Warp-65 KN/m Warp-63.8 KN/m Weft-43 KN/m Weft-47.2 KN/m 6 IS 1969 Warp-23 % Warp-22% Tensile elongation Weft-16 % Weft-19% ICZMP ORISSA 15-Sep-17 41 IIT Madras
WORK COMPLETION & REVISED COST The principal reason for high cost was due to collection of river 42 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.
Quantity fully Sl. Quantity as per Items of work Unit executed 43 No Agreement (30.6. 2016) 1 Geo-Tube Nos. 234 234 Z-Type Sheet piling on 2 Sqm 1200 1200 toe mound 9mm Rope 3 Nos 12089 11,996 gabion boxes 16mm Rope gabion 4 Nos 7285 7280 boxes
Observation of performance of the 44 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 45 PUL PUSAN IIT Madras INDIA 15-Sep-17
Damage to shore line on southern side of Pentha side during Hud Hud on 12.10.14 46 PUL PUSAN IIT Madras INDIA 15-Sep-17
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