International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 11 Issue: 07 | July 2024
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p-ISSN: 2395-0072
Case Study on Impacts of Groyne Structures on Puducherry Coastline Mohitmuthu G R1, Deepakraj M2, Lohith R3, Praveen Kumar G4, Dr. G.Vijayakumar 5 1,2,3,4 Student& PTU
5 Professor, Dept. of Civil Engineering, PTU, Puducherry, India
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Abstract - Coastal areas, the place where the water of the
introduced such as Groynes, Seawall, Breakwater and Jetties.
sea meets the land are unique places. Coastal Zones are dynamic interface between land and water and are common locations of high-density development, therefore monitoring of these regions are of immense importance both in terms development and protection of coastal settlement and ecology. Protection may be provided by constructing coastal protection structures such as Sea wall, Groynes, Jetties and so on. This study examines the Shoreline changes that have occurred after the construction of groynes structures along the Puducherry Coastline (Kalapet to Bommiarpalayam) for a period of 3 months (January to April), A handheld GPS device has been used in this study to map the Shoreline changes and this data were then exported to a GIS software (ArcGIS) and were analyzed using DSAS Version 5.0 (Digital Shoreline Analysis System) developed by USGS (U.S. Geological Survey) to determine various factors such as Net Shoreline Movement (NSM), Shoreline Change Envelope (SCE), End Point Rate (EPR) and Linear Regression Rate (LRR) and Weighted Linear Regression (WLR) and evaluate the effects that the Groynes have had on the Shoreline. The use of GPS provides better accuracy compared to conventional surveying methods. Furthermore, Soil samples have also been collected on the lee side of the groyne to determine their sediment characteristics and fall velocity.
1.1 Coastal Area Coastline is the point of contact between land and water. Due to the rapid urbanization, they are constantly under pressure which leads to coastal erosion, sea water intrusion and shoreline modification. The coastline from Bommayapalayam to Kalapet has been victim to major coastal erosion which has negatively impacted the coastal ecology and coastal settlements. To protect the coastline from further erosion and to regain the lost coastline groyne field were laid along this stretch to trap sediment from travelling in the longshore direction.
1.2 Coastal process and factors affecting it Coastal erosion not only affects the coastline but also the Coastal settlements and Coastal ecology. If it is not monitored and maintained properly, they will have a devastating impact and have a monetary cost to rehabilitate the coastline. The factors affecting coastal process include activities such as Fishing, Sand mining, Sewage disposal, urban expansion and tourism. This affects the natural process of the coast and cause coastal erosion. Seawater intrusion and shoreline modification. Coastal erosion not only affects the coastline but also the Coastal settlements and Coastal ecology. If it is not monitored and maintained properly, they will have a devastating impact and have a monetary cost to rehabilitate the coastline.
Key Words: Coastal Erosion, GIS, Sediment Transport, Groyne, DSAS.
1. INTRODUCTION This study focuses on the effects of Groyne field on the Puducherry Coastline. Coastal areas play a major role for the human beings from ancient time for trading, livelihood etc. Due to this phenomenon, rapid urbanization developed on the coastal area and developmental activities were conceded in order to fulfill the requirements of the settlements which have created a negative impact on the coast and its upland. These negative impacts include changes in shoreline such as erosion, seawater intrusion, shoreline modification etc. Coastal zone is increasingly under pressure from human activities such as fishing, sand mining, sewage disposal, urban expansion and tourism. Sand mining and harvesting of Mangroves have a major negative impact on beach stability, it gives the results of beach erosion and drastic shoreline change. To protect the receding shoreline coastal protection structures are
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1.3 Preventive Measures To prevent Coastal erosion, Coastal protection structures have been introduced. These include structures such as Groyne, Seawall, Jetties and Breakwater. Each has different use case depending upon the location and requirement. Our study focuses on Groyne structures and their effectiveness in Puducherry coastline.
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