Remote sensing and GIS-based Seashore changes of Tuticorin Zone and Punnaikayal Zone in parts of Thoothukudi Coast, Tamil Nadu, India (original) (raw)
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Indian Journal of Geo Marine Sciences, 2021
Shoreline change study is very challenging for any coastal scientists because of its dynamic changes. Erosion and accretion processes directly control the shoreline and coastal landforms. The present study is attempted to assess the shoreline changes between the Vembar and Tharuvaikulam coast of the Thoothukudi district, Tamil Nadu, India. Both the places were regarded as two zones viz. Vembar and Tharuvaikulam zone. These zones are further subdivided into three grids to understand and mark the erosion and deposition zones. The shorelines were digitized from satellite images of Landsat-5 (1997) and Landsat-8 (2018), and also the base details were extracted from a survey of India (SOI, 1968). These shorelines were taken to Geographic Information System for overlay analysis to determine the extent of erosion and accretion in the study area. The result of this study shows that during the period 1968-1997, Vembar and Tharuvaikulam zones have noticed accretion with a rate of 6.9 m 2 /y and 4.5 m 2 /y, respectively. Whereas, during the period 1997-2018, the Vembar zone was subjected to erosion with a rate of-1 m 2 /y. While in the Tharuvaikulam zone, the accretion process has reduced with a rate of 0.1 m 2 /y. The study results have shown that the Vembar zone has undergone erosion, whereas; the Tharuvaikulam zone has undergone both erosion and accretion. The accretion process rate is less compared to the erosion process during 1968-1997. The study concludes that the erosion is increasing due to natural and human intervention.
Journal of the Geological Society of India, 2022
The coastal region is one of the most sensitive areas on earth. This region has a diversified ecosystem. Erosion and accretion are common natural phenomena that can be seen in this region. In some circumstances, these changes become hazardous to the coastal ecosystem. Natural processes such as rainfall, flood, cyclone, longshore drift, and tectonic shifts can trigger irregular coastal changes. Similarly, anthropogenic factors such as urbanization, unscientific land usage, mining, etc., enhance coastal dynamics and make larger changes. Hence identification of such region has great importance. Geospatial technology has brought various advanced methods for shoreline change studies. It has decreased the huge effort for getting an accurate result for a larger area. Landsat satellite imageries with 30 m spatial resolution have been used for studying the changes in the shoreline of Ramanathapuram for the years 2000, 2005, 2010, 2015 and 2020. In Geographic Information System (GIS) software, the Digital Shoreline Analysis System (DSAS) tool is added for shoreline change analysis. DSAS will build the baseline transects. The rate of shoreline change was calculated using the MATLAB feature runtime function for ArcGIS. Based on the DSAS output, the region of high erosion, low erosion, stable, and low accretion, high accretion zones have been identified on the shore. The results reveal that 5.1% of the shoreline, around 9.3 km is under high erosion, 11.5% of the shoreline, which is around 20.8 km, is under low erosion, 71% of the shoreline, around 128 km, is a stable region, 6.7% of shorelines, around 12 km, have low accretion, and 5.6% of shorelines, around 10.1 km, have high accretion. The coastal villages, namely, Mayakulam, Keelakakrai, Periapattinam, Mandapam, West-Pamban, and East-Rameswaram, have a high erosion with a maximum rate of change between 2.29 to 5.11 m/y. The coastal villages Ervadi, Kalimankund, Sattankonvalsai, South-Pamban and South- Rameswaram have high accretion with a maximum rate of change between 2.34 to 5.24 m/y.
This paper focuses on shoreline changes due to erosion in the Puducherry coast of southern peninsular region in India. Accurate detection and frequent monitoring of shorelines are very essential to understand the coastal processes and its impact on coastal zone habitats. The present study is to investigate the spatial as well as quantify the shoreline erosion and accretion along the coast in the parts of Puducherry state and Villupuram district, east coast of Tamil Nadu by using geospatial techniques. The Survey of India topographic map, multi-temporal Remote Sensing satellite data were used to extract the shorelines. The data is processed and analyzed by software like ENVI image processing, Qgis and ArcGIS respectively. The rates of shoreline changes are estimated by Digital Shoreline Analysis System (DSAS) using GIS environment. Due to length of the shoreline, the study area has divided into four segments namely A, B, C and D. The study reveals that most of the study area has been undergoing erosion around 289m for the past 30 decades except south most part of Segment D. Both natural and anthropogenic processes along the coast modify the shoreline configuration and control the erosion, accretion activities of the coastal zones.
Arabian Journal of Geosciences, 2013
Shoreline is one of the rapidly changing landform in coastal area. So, accurate detection and frequent monitoring of shorelines are very essential to understand the coastal processes and dynamics of various coastal features. The present study is to investigate the shoreline changes along the coast between Kanyakumari and Tuticorin of south India, where hydrodynamic and morphologic changes occur continuously after the December 2004 tsunami. Multi-date satellite data of Indian Remote Sensing (IRS) satellites (1999, 2000, 2003, 2005, and 2006) are used to extract the shorelines. The satellite data is processed by using the ERDAS IMAGINE 9.1 software and analyzed by ArcGIS 9.2 workstation. The different shoreline change maps are developed and the changes are analyzed with the shoreline obtained from the Survey of India Toposheets (1969). The present study indicates that accretion was predominant along the study area during the period 1969-1999. But recently (from 1999 onwards), most of the coastal areas have experienced erosion. The study also indicates the reversal of shoreline modifications in some coastal zones. The coastal areas along the headlands have experienced both erosion and accretion. Though the coastal erosion is due to both natural and anthropogenic activities, the coastal zones where sand is mined have more impacts and relatively more rate of erosion than that of other zones. Improper and in-sustainable sand mining leads to severe erosion problem along this area. So the concept of sustainable management should be interpreted in the management of the near-shore coastal sand mining industry.
Arabian Journal of Geosciences, 2020
Shoreline position has been forwarding or retrograding due to many factors, among them climate change and human interferences play a major role. The shoreline changes can be analyzed by various methods. In the present study, Linear Regression Rate (LRR) method is applied for the demarcation of rate of shoreline changes along the coast of Thiruchendur Taluk, Thoothukudi district, by using Digital Shoreline Analysis System (DSAS). It is an extension tool in ArcGIS. The length of the coast is 45 km. The coastal zone is further divided into three coastal zones based on their administrative division (panchayat union). The zones are Alwarthirunagiri coast, Thiruchendur coast, and Udankudi coast. These zone divisions are done for detailed mapping. Multi-date of remotely sensed data was used for mapping the details. These data are georeferenced with the UTM projection of WGS1984 and digitized the shorelines with the FCC color image. Transect lines were generated using DSAS tool. The transect lines starting from 752 to 1210 were used for present study to assess the shoreline changes. The tool had generated the LRR Statistic reports on each transect lines for all shorelines. The statistic report has been classified into five classes, viz., high erosion, low erosion, stable, low accretion, and high accretion. Finally, the shoreline has classified with LRR reports. The overall result shows that, low accretion has notied at 36 km (79%), high accretion perceived at 8.7 km (8.7%), and stable has observed in 8.3 km (8.3%), along the coast. Whereas, low erosion was noticed around 1.4 km (3.1%), and no high erosion was noticed along the study area. Thiruchendur and Udankudi coastal zones are mostly perceived low rate of shoreline changes with the rate from 1.02 to 3.96 m/year, happen in 18.9 km and 16.5 km, respectively. But, Alwarthirunagiri coast zone, low rate of erosion is noticed along the 1.4-km length of the shore. The study has concluded that, most of the Thiruchendur Taluk coastal areas are under the low-rate accretion, and the same area is observed as erosion along the coast due to both natural and human activities. Thiruchendur Taluk has major coastal cities, and a large number of people live around the coast. There are numerous natural resources and tourist places around the coast. Therefore, this coastal area shoreline changes studies should be examined.
An attempt is being made to elucidate the effect of shoreline changes ersion and accretion along the parts of Cuddalore district coastal area. The spatial variability of shoreline changes are studied using IRS 1B LISS-I 1991, IRS 1D LISS-III 2001 with IRS 1D PAN merged data, IRS P6 LISS-IV data 2006 and Resourcesat-2 data 2012. The Survey of India toposheets of (1971) used for this study. The kind and extent of shoreline changes were investigated by using GPS during ground truth verification. Erosion during the period 1971 to 1991 was 0.81 km2, 1991 to 2001 was 4.91, 2001 to 2006 was 0.39 and 2006 to 2012 was 1.27 km2 respectively. The accretion during the period 1971 to 1991 was 4.07 km2, 1991 to 2001 was No change, 2001 to 2006 was 1.13 and 2006 to 2012 was 0.21 km2 respectively. Erosion and accretion were also observed in specific geographical areas such as beach, plantation, land with scrub, river, mangrove forest, villages and urban coast. In overall these areas the erosion dominates, suggesting the many of the natural disasters occur in the study period. The results are analyzed and presented in this paper. The study results revealed that 3.21 km2 area erosion of the shoreline occurred in the past 41 years.
ECO CHRONICLE, 2019
The present study investigates the rate of shoreline changes along the coast of Tharuvaikulam taluk, Thoothukudi district, between the long-term period of 1968 and 2018. The study area has been divided into four divisions based on their coastal villages namely Vembar, Periasamypuram, Vaippar and Kallurani. The shorelines have been extracted for various periods through Landsat Satellite imagery and Survey of India (SOI) Toposheets. The Linear Regression Rate (LRR) method has been used to assess the rate of shoreline changes along the coast with the help of Digital Shoreline Analysis System (DSAS) tool in ArcGIS software. The DSAS tool generated 225 transect lines perpendicular to the shorelines. It has also estimated the LRR statistical report at each transect. The statistical report has been further classified as the classes of High Erosion, Low Erosion, Stable, Low Accretion and High Accretion. Of the 21.4 km length of the coast of Tharuvaikulam division, 52% of low accretion in 10.7 km and 24% low erosion in 4.1km were noticed. Vaippar coastal village was noticed with severe erosion along its 4.8 km coast. The present study thus concluded that low accretion and low erosion have dominated the entire coast of Tharuvaikulam taluk in Thoothukudi district, however, Vaippar zone was noticed with severe erosion during the period of 1968-2018.
International Seminar on “Computational Environmental Earth Science” (CEES 2022), 2022
This research article summarizes the techniques for integrating Remote Sensing and GIS, with field measurements for validating and analyzing the shoreline Changes. Geomorphic evolution of coast also identifies by using Multi-temporal Landsat Satellite Data of the year’s 1969, 1992, 2000, 2010 and 2019. Coastal Digital Elevation Model (DEM) Data was retried by Shuttle Radar Topography Mission (SRTM) data for identifying the inundation area in the coast. Shoreline changes were elucidated using Digital shoreline analysis system (DSAS) analysis. It has identified that accretion as well as erosion takes place in the present study area. The findings of the present study from the coastal region of Tuticorin can be used as Coastal Change Analysis, in particular the variation in Shorelines and Sea Level Rises important for coastal disaster reduction, environmental conservation, resource management and decision making on coastal development
Assessment of coastal erosion along Indian coast on 1 : 25, 000 scaleusing satellite data
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2014
The long stretch of coastline on the either side of Indian peninsula is subjected to varied coastal processes and anthropogenic pressures, which makes the coast vulnerable to erosion. There is no systematic inventory of shoreline changes occurring along the entire Indian coast on 1:25, 000 scale, which is required for planning measures to be taken up for protecting the coast at national level. It is in this context that shoreline change mapping on 1:25, 000 scale for the entire Indian coast based on multidate satellite data in GIS environment has been carried out for 1989-91 and 2004-06 time frame. The paper discusses salient observations and results from the shoreline change inventory. The results show that 3829 km (45.5%) of the coast is under erosion, 3004 km (35.7%) of the coast is getting accreted, while 1581 km (18.8%) of the coast is more or less stable in nature. Highest percentage of the shoreline under erosion is in Nicobar Islands (88.7%), while percentage of accreting coastline is highest for Tamil Nadu (62.3%) and the state of Goa has highest percentage of stable shoreline (52.4%). The analysis shows that the Indian coast has lost a net area of about 73 sq km during 1989-91 and 2004-06 time frame. In Tamilnadu, a net area of about 25.45 sq km have increased due to accretion, while along Nicobar Island about 93.95 sq km is lost due to erosion. The inventory has been used to prepare "Shoreline Change Atlas of the Indian Coast", brought out as Six Volumes for the entire Indian coast.