[PPT] - Presentation to 15 th Meeting of CPDAC Geosynthetics Applications in PowerPoint Presentation

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Presentation to 15th Meeting of CPDAC

Geosynthetics Applications in Coastal Protection New Delhi ,17th August’ 17

Presented by Rajarshi & Deeraj

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Agenda Applications for Coastal protection and Ports Products & Proposed Solutions Project References International Case studies About Maccaferri

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Established in Bologna Italy in 1879
Gabions, as river bank protection structures, were

used in 1894 for the first time; …the structure is still working today...

Maccaferri group has around 3000 employees

worldwide, 1 billion USD of yearly turnover, and an industrial group working on all five continents

The ENVIRONMENTAL SOLUTION business

area has a yearly turnover of 200 million USD

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About us

OVER

100 YEARS

OF EXPERIENCE

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GEOSYNTHETICS IN BEACH EROSION MITIGATION

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The key physical parameters to identify coastal erosion as a problem are: Coastal Geomorphology: Coastline type and sensitivity to coastal processes. Wind: Wind may transfer sediment from the beach environment landward on all open coastlines. Waves: They introduce energy to the coast and also a series of currents that move sediment along the shore (longshore drift) and normal to the shore (cross-shore transport). Tides: They modulate wave action, controlling energy arriving on the coast and drive groundwater fluctuation and tidal currents. Vegetation: Important for improving slope stability, consolidating sediments and providing some shoreline protection.

Coastal Erosion Parameters

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Human activities that must be considered over the range of spatial and time scales are: Activities along the coast: land reclamation, port/ harbour development, Removal of dune vegetation and mangroves, other structures such as groynes and jetties typically cause erosion down-drift of the structure. Activities within river catchments/watersheds: Dam construction and river diversion cause reduction of sediment supply to the coast that contributes to coastal erosion. Onshore and offshore activities: Sand and coral mining and dredging may affect coasts. The impact of these activities will be obvious within a short period of time (one to ten years).

Coastal Erosion Parameters

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Geosynthetics

Containment: Majorly Geotextile tubes(Geosystems) used for erosion protection, Flood prevention works.

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Geosynthetics in Beach Erosion Mitigation - Historical Background

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Protection Bund Breakwater Groin Structure Beach Formation

Applications on the Coast

Pic taken at : LNG Petronet Kochi

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Replacing Inner core Layer of Groynes with Geo textile bags / tubes Applications on the Coast

Pic Courtesy: PILOT PROJECT IN ARATTUPUZHA ,KERALA

Recommendation of IIT Madras, Ocean Engineering Department

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Installation Methodology - Material Storage and Handling

3. Installation Methodology Material unloading using Cranes Geotextile tube stacking and storing

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Installation Methodology - Preparation of Tubes at Land

3. Installation Methodology Rolling out of Geotextile tubes Lifting of Tubes folded in Concertina style

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Installation Methodology

3. Installation Methodology Transport of Empty Tubes into the Sea Pipeline arrangement from slurry pump to filling area

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Installation Methodology

3. Installation Methodology Spreading of Empty Tube Underwater Hydraulic Filling of Geotextile Tube (Underwater)

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Marine mattresses are rock-filled containers constructed of high-strength geogrid

Applications on the Port

Mattress lengths vary up to a recommended maximum of 35 ft. Mattress thickness is usually between 8 and 12 in. for revetment applications, but thicknesses can vary between 4 in. for bedding layers up to 24 in. for heavy- duty applications exposed to waves and

currents. Assuming the stone fill has a

volumetric weight of about 110 lb/cu ft, a 35- ft-long, 5-ft-wide, 1-ft-thick mattress weighs approximately 9.6 tons

Shore protection mattress revetment , Cape May State Park Philadelphia Scour apron at Seabrook, New England

Applications: 1. Under layer for Rubble-Mound Structures 2. Toe Protection. 3. Pipeline and Outfall Protection. 4. Revetment Units for Low to Moderate Wave Exposure. 5. Scour Mats at Inlets 6. Scour Prevention Mats in Advance of Construction

f Coastal Structures.

7. Structure Foundation Mats and Bedding Layers Where Erosion Is Problematic or Foundation Soil Strength Is Poor

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Construction of Dykes using Gabions Applications on the Port

Pic Courtesy: Proposed Solution at Nayachara Island

Tail end portion on the Nayachara Island. A Dyke structure is to be constructed with stacked Geotextile Tubes and covered with Gabion Mattress filled with Geotextile Bags towards the Estuary side. Length: 6.9 Km Gabion walls to retain the dredged material. Front Height : 6m Wall at the back:2m Material: Zinc+PVC coated Gabions lined with geotextile and filled with dewatered non- cohesive dredged material

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Quay wall using Gabions for mooring and berthing of vessels Applications on the Port

a)A schematic sketch of Gabion block quay wall ( 1.5m-3.0m Height) b) Reinforced gabion walls for greater heights

Prefilled Gabions are placed under

the berthing platform replacing piles Quays with an open construction, where the deck is supported on piles

Pic Courtesy: International container Trans-shipment Terminal, Cochin Port trust. (Maccaferi- India 2009-2010)

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Anchorage/ protection of pipelines using ACBM Applications for Pipeline Protection

Rectangular unit made up of concrete blocks which can be manufactured in different thickness, joined by means of polypropylene ropes.

Articulated Concrete Block Mattress

Uses:

Designed for pipe line protection & anchorage.
Prevent scour action on pipeline reducing flow of fines.

Advantages:

Materials are sea water proof - no reduction in compressive strength.
Quick Installation leads to cost savings.
Design life of minimum 25 years - no maintenance required.
Easily removable

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Anchorage/ protection of pipelines using SARMAC Applications for Pipeline Protection

The Sarmac mattress is a rectangular unit made of an external geotextile covering, filled with stones and sand asphalt mastic, internally reinforced with a steel woven wire mesh.

Articulated Concrete Block Mattress

Advantages:

Permanent flexibility
High unit weight
Toughness
Resistance to fracture
Flexible lifting loops
Easy to transport
Economical to store
Preformed shape to

facilitate positioning

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Solutions using Geosynthetics

Basal reinforcement PVDs Basal reinforcement for Piled Embankments Geosynthetic Encased Stone Column/Stone Column

Applications on the Port Roads

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BREAKWATER

Potential Applications

Basal Reinforcement PVDs Piled Embankment Stone Column

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Other Applications

RE Wall : Design Completed Structure

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PROJECTS

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Project No -1

Project : Using Geo-Textile Tubes:

Protection Bund
Construction of Groyne
Extension of Existing Break water

Client : LNG PETRO NET LTD. Construction Start Date : April 2014 Construction Completion date : January 2015 Project Brief : To provide long term solution for achieving required tranquility at the LNG Jetty, reduce siltation and protect beach from erosion.

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Geotextile Tubes

Large size tubular containers filled with sand slurry on land or in

water

Geotextile tubes are made of sewn geotextile material, they

contain inlets on the top for attachment of pipe to allow hydraulic fill

Height of geotextile tubes vary from 1.5m to 3 m, width vary

between 2m to 6m

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Main Applications of Geotextile Tubes Prot

tect

ctio ion n Bund nd / Sea Wall

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Seawall / Protection bund using Geotextile Tubes

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Main Applications of Geotextile Tubes Groyne Structu ture re

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Effects of Geotextile Tubes

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Main Applications of Geotextile Tubes Breakw akwat ater

It is an offshore structure built along the shoreline to dissipate the wave energy and increase harbor

tranquility.

The conventional rock breakwater is considered a hard structure and could pose dangers to small boats

and vessels during high tides when it is fully submerged.

Geotextile tubes are alternative to these problems and also cost effective when compared to the

conventional rubble mound breakwaters

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Geotextile Tubes : Breakwater Structure

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Beach nourished due to Groin Structure Protection Bund

Effects of Geotextile Tubes

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Project No -2

Project : Construction of Artificial Submerged Reef Using Geo-synthetic Tubes Client : Maharashtra Maritime Board (MMB) Construction Start Date : February 2015 Construction Completion date : Going On Project Brief : Mirya Bay, located on the West Coast in Ratnagiri District, Maharashtra had been subjected to severe erosion and consequently accretion. In order to mitigate the problem of erosion, Maharashtra Maritime Board (MMB) has proposed the construction of a Multipurpose Submerged Geotextile Reef at the Northern shoreline of Mirya Bay by installing sand filled Geotextile containers

n the sea bed under water.

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Submerged Reefs

Submerged reefs are offshore structures build parallel to the shoreline.
The main function of submerged reef is to dissipate the wave energy reaching

the shoreline

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Submerged Reefs using Geotextile Tubes

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Protection from Erosion using Geotextile Tube at Ambalapuzha - Irrigation Department Kerala  Pilot Project for 100m in Kerala  Constructed in continuation of a reformed Sea wall before the erosion season  Work Commenced in April 2016  Local sand was made into a slurry and pumped into the tubes  In last January, Sea wall structure made of Armour stones have collapsed completely in the southern side, but Geo systems are still intact

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