AIM

The principal component of mapping shoreline positions is to ascertain the seaward movement (erosion) and landward movement (accretion) due to evolving climatic and anthropogenic influences. This provides a framework for monitoring shoreline movement, identifying coastal hazard zones, and formulating policies for coastal development regulation.

OBJECTIVES

The shoreline change assessment of Karnataka coast represents long-term shoreline change for a period of 31 years from 1990-2021 using high-resolution satellite data. Shoreline changes were evaluated by comparing eleven set of satellite images as follows.

• Shoreline change data were prepared on 1:25,000 scale using various satellite imagery and stored as layers in a GIS environment for 11 set of years. For evaluating the shoreline positions, different shoreline proxies such as vegetation line, Berm line, High water line, structures, dune vegetation line, and rocky coast were mapped on satellite images.
• Long-term shoreline change rates calculated by Linear Regression method using Digital Shoreline Analysis (DSAS) method for every 200 m transect interval perpendicular to the coast from the baseline to calculate erosion/accretion statistics.
• Overall the results were categorized into eight classes as “Zones of erosion/accretion” as follows:

FINDINGS

Table 1: Shoreline Characteristics and Statistics for Karnataka coast

• Shoreline change rates calculated for 1397 transects that covers a length of about 323 km.
• Shoreline change analysis for long-term trend reveals that about 14% of Karnataka coast has erosion, 23% artificially protected by seawalls and the coast underlines 22% of rocky coast.

Fig 1: Overall Erosion/Accretion pattern of Karnataka coast

About 9% of the coast has accretion and 31% is stable.

AIM

The principal component of mapping shoreline positions is to ascertain the seaward movement (erosion) and landward movement (accretion) due to evolving climatic and anthropogenic influences. This provides a framework for monitoring shoreline movement, identifying coastal hazard zones, and formulating policies for coastal development regulation.

OBJECTIVES

The shoreline change assessment of Puducherry coast represents long-term shoreline change for a period of 31 years from 1990-2021 using high-resolution satellite data. Shoreline changes were evaluated by comparing eleven set of satellite images as follows.

• Shoreline change data were prepared on 1:25,000 scale using various satellite imagery and stored as layers in a GIS environment for 11 set of years. For evaluating the shoreline positions, different shoreline proxies such as vegetation line, Berm line, High water line, structures, dune vegetation line, and rocky coast were mapped on satellite images.
• Long-term shoreline change rates calculated by Linear Regression method using Digital Shoreline Analysis (DSAS) method for every 200 m transect interval perpendicular to the coast from the baseline to calculate erosion/accretion statistics.
• Overall the results were categorized into eight classes as “Zones of erosion/accretion” as follows:

FINDINGS

Table 1: Shoreline Characteristics and Statistics for Puducherry coast

• Shoreline change rates calculated for 219 transects that span a length of about 42 km.
• Shoreline change analysis for long-term trend reveals that about 44% of the Puducherry coast is eroding, and 11% artificially protected by seawalls.
• About 10% of the coast has accretion and 34% is stable.

Fig 1: Overall Erosion/Accretion pattern of Puducherry coast

AIM

The principal component of mapping shoreline positions is to ascertain the seaward movement (erosion) and landward movement (accretion) due to evolving climatic and anthropogenic influences. This provides a framework for monitoring shoreline movement, identifying coastal hazard zones, and formulating policies for coastal development regulation.

OBJECTIVES

The shoreline change assessment of Kerala coast represents long-term shoreline change for a period of 31 years from 1990-2021 using high resolution satellite data. Shoreline changes were evaluated by comparing eleven set of satellite images as follows.

• Shoreline change data were prepared on 1:25,000 scale using various satellite imagery and stored as layers in a GIS environment for 11 set of years. For evaluating the shoreline positions, different shoreline proxies such as vegetation line, Berm line, High water line, structures, dune vegetation line, and rocky coast were mapped on satellite images.
• Long-term shoreline change rates calculated by Linear Regression method using Digital Shoreline Analysis (DSAS) method for every 200 m transect interval perpendicular to the coast from the baseline to calculate erosion/accretion statistics.
• Overall the results were categorized into eight classes as “Zones of erosion/accretion” as follows:

FINDINGS

Table 1: Shoreline Characteristics and Statistics for Kerala coast

• Shoreline change rates calculated for 2938 transects that covers a length of about 586 km.
• Shoreline change analysis for long-term trend reveals that about 15% of Kerala coast is eroding, 4% has rocky coast and artificially protected seawalls (46%) dominate the major stretch of the coastline.
• About 18% of the coast has accretion and 17% is stable.

Fig 1: Overall Erosion/Accretion pattern of Kerala coast

Aim

The principal component of mapping shoreline positions is to ascertain the seaward movement (erosion) and landward movement (accretion) due to evolving climatic and anthropogenic influences. This provides a framework for monitoring shoreline movement, identify coastal hazard zones and formulate policies for regulation of coastal development.

Objectives

The shoreline change assessment of Goa coast represents long-term shoreline change for a period of 31 years from 1990 to 2021 using high resolution satellite data. Shoreline changes were evaluated by comparing eleven set of satellite images as follows:

• Shoreline change maps were prepared on 1:25,000 scale using various satellite imagery and stored as layers in GIS environment for 31 years. Different shoreline proxies such as vegetation line, berm line, high water line, structures, dune vegetation line and rocky coast for evaluating the shoreline positions were considered.
• Long-term shoreline change rates were calculated using Digital Shoreline Analysis (DSAS) taking Linear Regression Rate for every 200 m transect interval perpendicular to the coast from the baseline to calculate erosion/accretion status.
• The results were categorized into eight classes as “Zones of erosion/accretion” as follows:

Key Findings

• Shoreline change rates were calculated for 588 transects that covers a length of about 172 km.
• Shoreline change analysis for long-term trend reveals that about 7% of Goa coast is eroding.
• About 10% of the coast has accretion and 26% is stable.

Shoreline Change Statistics for Goa coast

Overall Erosion/Accretion pattern of Goa coast

AIM

The principal component of mapping shoreline positions is to ascertain the seaward movement (erosion) and landward movement (accretion) due to evolving climatic and anthropogenic influences. This provides a framework for monitoring shoreline movement, identifying coastal hazard zones, and formulating policies for coastal development regulation.

OBJECTIVES

The shoreline change assessment of TamilNadu coast represents long-term shoreline change for a period of 31 years from 1990-2021 using high-resolution satellite data. Shoreline changes were evaluated by comparing eleven set of satellite images as follows.

• Shoreline change data were prepared on 1:25,000 scale using various satellite imagery and stored as layers in a GIS environment for 11 set of years. For evaluating the shoreline positions, different shoreline proxies such as vegetation line, Berm line, High water line, structures, dune vegetation line, and rocky coast were mapped on satellite images.
• Long-term shoreline change rates calculated by Linear Regression method using Digital Shoreline Analysis (DSAS) method for every 200 m transect interval perpendicular to the coast from the baseline to calculate erosion/accretion statistics.
• Overall the results were categorized into eight classes as “Zones of erosion/accretion” as follows:

FINDINGS

Table 1: Shoreline Characteristics and Statistics for Tamil Nadu coast

• Shoreline change rates calculated for 4526 transects that covers a length of about 1005 km.
• Shoreline change analysis for long-term trend reveals that about 31% of Tamil Nadu coast is eroding, and 6% artificially protected by seawalls.
• About 24% of the coast has accretion and 39% is stable.

Fig 1: Overall Erosion/Accretion pattern of Tamil Nadu coast