Shoreline and coral reef ecosystem changes in gulf of Mannar, Southeast coast of India

Thanikachalam, Muniappan; Ramachandran, S.

doi:10.1007/bf03030823

Cited by 17 publications

(4 citation statements)

References 5 publications

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“…The change in the geometric center of gravity of the bay is positively related to the growth rate of the shoreline and the complexity of the shoreline geometry; that is, faster shoreline changes correspond to a greater rate of change in the geometric center of gravity of the bay in space (Lai et al, 2015;Li et al, 2010;Snoussi et al, 2008). Among the coastal areas where socioeconomic activities are more concentrated, the change in the bay shape is mainly affected by reclamation activities (Thanikachalam et al, 2003). After studying the changing features of the structure, development and utilization of the Chinese shoreline, reported that human activity mainly involving land reclamation has far exceeded natural factors and has become the dominant factor, especially in recent decades.…”

Section: Reasons For Variations In the Geometric Shape Of The Baymentioning

confidence: 99%

Dynamics of shoreline and land reclamation from 1985 to 2015 in the Bohai Sea, China

et al. 2019

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Extraction and analysis of the shoreline and land reclamation patterns are important for studies on topics such as the dynamics of coastal wetland ecological environments, transportation and exchange of material energy in coastal regions, and recruitment of fishery resources. Spatial-temporal variations in the shoreline and land reclamation in the Bohai Sea were analyzed based on 49 Landsat images of 7 periods from 1985 to 2015. The following conclusions were drawn. (1) The extracted shoreline data based on visual interpretation had high precision, and the shoreline extraction errors could be controlled within the theoretical range. (2) Over the past 30 years, the shoreline of the Bohai Sea has exhibited an average rate of change of 188.47 m/a and an average accretion distance of 3.55×10 3 m toward the sea. The fastest rate of shoreline change occurred in Laizhou Bay (134.78 m/a), followed by Bohai Bay (128.20 m/a) and Liaodong Bay (61.69 m/a). (3) The average rate of reclamation was 3.25×10 4 ha/a in the Bohai Sea, where the total area of aquaculture land, unused land, and salt land exceeded 60% of the total reclamation area. (4) The geometric shape of the bay became increasingly complicated from year to year, and the geometric center of gravity of the bay moved rapidly toward the sea. In addition, the area of the bay showed a significant decreasing trend. Therefore, to protect the function and structure of the ecosystem in coastal regions, we must control the scale and rate of land reclamation in the future.

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Section: Reasons For Variations In the Geometric Shape Of The Baymentioning

confidence: 99%

Dynamics of shoreline and land reclamation from 1985 to 2015 in the Bohai Sea, China

et al. 2019

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“…This would indicate that this coast has been subjected to intense soil erosion and accretion. Thanikachalam and Ramachandran (2003) have also reported an average rate of erosion and accretion of 6.23 and 6.54 m/year respectively along the shore of Rameshwaram island of the adjacent Bay of Bengal. Such soil erosions would definitely affect the reef ecosystem by depositing certain percentage of soil on the reef area.…”

Section: Coral Reef Resourcesmentioning

confidence: 91%

Assessment of coastal bio-resources of the Palk Bay, India, using IRS-LISS-III data

Sridhar

Thangaradjou

Kannan

et al. 2010

J Indian Soc Remote Sens

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Coastal resources viz., coral reefs, seagrasses, mangroves, and coastal land features viz., sandy beach, mudflats and salt pan/aquaculture ponds were classified and assessed in the Palk Bay region of the south-east coast of India using IRS LISS III satellite image (1996, 2000, 2002 and 2004). The study recorded an areal coverage of 286.95 ha of reef area during 2004, which is 177.54 ha lesser than that of the reef area of 1996. The reef vegetation composed mainly of seaweeds has gained over 29.44 ha during the same period. Likewise, sand over reef area has also increased alarmingly i.e. 120.34 ha between 1996 and 2004. The seagrass beds of Munaikkadu region of the Palk Bay are comparatively protected and have gained over 7.5 ha between 1996 and 2004. It has been found that both the dense (2.99 ha) and sparse (36.45 ha) mangroves have gained their areal coverage considerably between 1996 and 2004. Whereas in Devipattinam region, many anthropogenic pressures are exerted only on the seagrass resources which has led to the reduction of over 785.5 ha of dense seagrass beds between 1996 and 2004. The study clearly indicated that the resources are under the pressures of low to high threats, especially the coral reefs and seagrasses, if the pressures continue, coastal resources of the Palk Bay may face serious threats of destruction in this part of the Bay in the years to come.

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“…Shoreline change is the impact of gain and loss of sediment due to the littoral drift. During northeast monsoon period, littoral currents move towards south alter the rate of change of erosion/accretion (Thanikachalam & Ramachandran 2003). The entire coast of Rameswaram facing the GoM, experiences current in westerly direction throughout the year, except in June and July.…”

Section: Coastal Stabilitymentioning

confidence: 99%

Shoreline oscillation of Dhanushkodi, Rameswaram, India

Natesan

Vishnunath

Kathiravan

2014

Geocarto International

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Rameswaram Island located on the southeast coast of India bounded by Gulf of Mannar (GoM) on the south and Palk Bay (PB) on the north, respectively, is unique in nature. The southeastern part of Rameswaram Island known as Dhanushkodi foreland is a long sand spit of about 20 km length. Shoreline erosion/accretion rates are computed based on End-Point Rate, Linear Regression Rate and Net Shoreline Change from Indian Remote sensing Satellite, Linear Imaging Self scanning Sensor III images from 1998 to 2012. Along the PB coast of Dhanushkodi foreland, eroding shorelines are dominant except Arichamunai, whereas it is reversing along GoM. Inter-annual shoreline change revealed that changing trend and stability of Island are affirmed with statistical approaches. An equilibrium shoreline trend is noticed on both the sides of Dhanushkodi foreland. Annual shoreline change rate indicates erosion and accretion in northern and southern coastline of Dhanushkodi foreland varies, respectively.

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Shoreline and coral reef ecosystem changes in gulf of Mannar, Southeast coast of India

Cited by 17 publications

References 5 publications

Dynamics of shoreline and land reclamation from 1985 to 2015 in the Bohai Sea, China

Dynamics of shoreline and land reclamation from 1985 to 2015 in the Bohai Sea, China

Assessment of coastal bio-resources of the Palk Bay, India, using IRS-LISS-III data

Shoreline oscillation of Dhanushkodi, Rameswaram, India

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