Shoreline changes along the Kutubdia Island, south east Bangladesh using digital shoreline analysis system (original) (raw)
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Arab Gulf Journal of Scientific Research
PurposeThis study aims to determine shoreline change statistics and net erosion and accretion, along the Kuakata Coast, a magnificent sea beach on Bangladesh’s southernmost point.Design/methodology/approachThe research follows a three stages way to achieve the target. First, this study has used the geographic information system (GIS) and remote sensing (RS) to detect the temporal observation of shoreline change from the year 1991 to 2021 through satellite data. Then, the digital shoreline analysis system (DSAS) has also been explored. What is more, a prediction has been done for 2041 on shoreline shifting scenario. The shoreline displacement measurement was primarily separated into three analytical zones. Several statistical parameters, including Net Shoreline Movement (NSM), Shoreline Change Envelope (SCE), End Point Rate (EPR) and Linear Regression Rate (LRR) were calculated in the DSAS to quantify the rates of coastline movement with regard to erosion and deposition.FindingsEPR a...
The study attempted to assess the changes in shoreline and erosion-accretion of newly formed island at the mouth of the Meghna river estuary in Bangladesh using multi temporal satellite images and GIS techniques. The current study used NDWI an MNDWI to delineate land and water boundary to extract the shoreline and also used some overlay analysis to measure the erosion-accretion. DSAS extension is used for analyzing the shifting of the shoreline. The results (1990-2015) show that the island has 1192 hectares of land accreted during this time period, and about 1 km of its shoreline lost during this time period as it has broken in few places. Most accretion found in the northwestern part and erosion in southeastern and southwestern part. The study area was divided into four different segments and about 115 transects were constructed, of which about 74 shows the seaward movement and 44 shows landward movement. Seaward movement and rate of shoreline shifting is higher in the northwestern part where net shoreline movement (NSM) is +1897 meters and end point rate (EPR) is +73 m/year. Landward movement and the rate of shoreline shifting are higher in southeastern and southwestern part of which net shoreline movement (NSM) is about-2680 meters and end point rate (EPR) is about-129 m/year. The highest landward movement is found as-2680 meters and highest seaward movement as +1897 meters. Accretion process is dominant while erosion process discontinued the shoreline in some places.
Shoreline change detection using DSAS technique: Case of Saint Martin Island, Bangladesh
Remote Sensing Applications: Society and Environment, 2023
This study focuses on the shoreline change detection along the North Sinai coast in Egypt using geographic information system and digital shoreline analysis system (DSAS) during the elapsed period from 1989 to 2016. The measurement of shoreline variation is mainly described for three zones: zone I, El-Tinah plain bay; zone II, El-Bardawil Lake; zone III, El-Arish valley. The rates of shoreline changes in the form of erosion and accretion patterns are automatically quantified by four statistical parameters functioned in DSAS namely endpoint rate, net shoreline movement, linear regression rate (LRR), and least median of squares. LRR results elucidate that the western seaside of El-Tinah plain bay has experienced an extremely dynamic feature with an average erosion rate of −8.17 m/year. The littoral drifts have been driven by eastward alongshore currents toward the east side of the bay to be accreted with an average rate of +4.28 m/year. Moreover, the shoreline has progressed west of El-Bardawil inlet (1), El-Bardawil inlet (2), and El-Arish harbor. Subsequently, the corresponding average beach growth rates are found to be +2.7, +8.5, and +6.5 m/year, respectively. In contrast, the shoreline on the down-drift side to the east has negatively retreated, and the corresponding beaches have regressed at rates of −4.5, −8.65, and −2.9 m/ year, respectively.
Technical and Social Approaches to Study Shoreline Change of Kuakata, Bangladesh
Frontiers in Marine Science, 2021
In recent years, shoreline determination has become an issue of increasing importance and concern, especially at the local level, as sea level continues to rise. This study identifies the rates of absolute and net erosion, accretion, and shoreline stabilization along the coast of Kuakata, a vulnerable coastal region in south-central Bangladesh. Shoreline change was detected by applying remote sensing and geographic information system (RS-GIS)-based techniques by using Landsat Thematic Mapper (TM), Landsat 8 Operational Land Imager (OLI) and Thermal Infrared Sensor (TIRS) satellite images at 30-m resolution from 1989, 2003, 2010, and 2020. The band combination (BC) method was used to extract the shoreline (i.e., land-water boundary) due to its improved accuracy over other methods for matching with the existing shoreline position. This study also used participatory rural appraisal (PRA) tools which revealed the societal impacts caused by the shoreline changes. Coupling RS-GIS and PRA ...
With a total population of 278000, Sandwip has long been facing severe land erosion and accretion problems because of its geographical setting in the coastal area of Bangladesh. This research aimed to assess the erosion and accretion status along with the shoreline movement of this island based on multi temporal Landsat imagery and hydrological data from 1974 to 2014. The results revealed that water discharge and water level data are positively correlated with erosion and negatively correlated with accretion data. The results also indicate that the island has lost around 90 km 2 of its stable and gained around 17 km 2 of new land. The erosion activity is mostly happening in the northwestern, western, and southern banks whereas accretion has been occurring at a slower rate in the northern and eastern banks of the island. Because of this dynamic erosion-accretion activity the shoreline of the island has been moving towards the northeast side. This 40 years' data analysis solemnly affirms that maximum shoreline movement towards the land was 4004 meter in the southern bank with annual rate of approximately 100 m per year. At the same time interval, maximum seaward movement of the shoreline was observed in the northeastern portion (NSM >2247 m) at a maximum net rate of around 56 m per year (EPR = 55.85 m per year). Because of this idiosyncratic characteristic Sandwip's total land area was reduced to 73 km 2 during 1974 and 2014.
Asian Journal of Geographical Research, 2019
Coastal zones are the most dynamic feature of earth surface in which lithosphere, hydrosphere and atmosphere gets into contact with each other. Such dynamic process should be monitored with great importance as a large portion of the world’s population is living along the coastal zones. This paper focuses on delineation of the changes in the coastal land areas of Chittagong in Bangladesh through the shifting of coastline. Chittagong coastal area is around 245 km with an unbroken 125 km gently slopped sandy sea beach in Cox’s Bazar. However, due to both the natural phenomenon and human interventions, coastline in these areas has been changing gradually. These changes have occurred in relation to land biomass, erosion and accretion rate. Therefore, shoreline geometry analysis can help understand such dynamic coastal process. Several satellite images from Thematic Mapper (TM) and Enhanced Thematic Mapper (ETM) were used for the long term coastline change analysis. The digital shoreline ...
ESTEEM Academic Journal, 2023
Kelantan is a Malaysian state renowned for its beautiful jungles and coastal districts. Kelantan, which is susceptible to monsoons and tidal waves, witnessed a tsunami-like inundation that affected its coastline landscape in 2014. This study does a comparative examination of shoreline alterations between 2013 and 2021 using the Digital Shoreline Analysis System (DSAS) technology. The coastline has grown by approximately 4.03 percent, from 62.1 kilometres to 64.6 kilometres, as a result of the implementation of digitalisation procedures. This highlights the increase in coastline areas between 2013 and 2021. Using GIS and satellite data, the study identifies considerable sedimentation in Pantai Geting and Lagun Jubakar, Tumpat, as well as severe erosion in Pantai Kundur and Pantai Cahaya Bulan, Kota Bharu. The analysis of the Shoreline Change Envelope (SCE) and Net Shoreline Movement (NSM) reveals an accretion rate of 728.44 m/year and a negative distance of-281.91 m/year, which indicates erosion. The paper concludes by emphasising Kelantan's shoreline expansion over the previous decade, stressing the significance of monitoring coastal changes for effective environmental management and catastrophe preparedness.
Rates of shoreline change along the coast of Bangladesh
Bangladesh, at the confluence of the sediment-laden Ganges and Brahmaputra Rivers, supports an enormous and rapidly growing population (>140 million in 2011), across low-lying alluvial and delta plains that have accumulated over the past few thousand years. It has been identified as one of the most vulnerable places in the world to the impacts of climate change and sea-level rise. Although abundant sediment supply has resulted in accretion on some parts of the coast of Bangladesh, others are experiencing rapid erosion. We report a systematic assessment of rates of shoreline change over a 20-year period from 1989 to 2009, using Landsat satellite images with pixel resolution of 30 m on the ground. A Band ratio approach, using Band-5 divided by Band-2, discriminated the water line on images that were largely cloud-free, adequately registered, and at comparable tidal stages. Rates of shoreline change were calculated for >16,000 transects generated at 50 m intervals along the entire mainland coastline (>1,100 km) and major islands, using the End Point Rate (EPR) method in the Digital Shoreline Analysis System (DSAS) extension in ArcGIS®. Erosion characterises most of the seaward margin of the Sundarbans in western Bangladesh. Retreat rates of up to 20 m/yr are typical, with little evidence that local devastation of the mangrove fringe by Cyclone Sidr in November 2007 had resulted in uncharacteristic long-term rates of retreat where it made landfall. Erosion exceeded accretion in the Barguna Patuakhali coastal zone, most of which eroded at up to 20 m/yr, but with truncation of the southern tip of the Patharghata Upazila at up to 100 m/yr. In Bhola, erosion at rates of up to 120 m/yr were observed along much of the coast, but in the Noakhali Feni coastal zone, similar rates of erosion were balanced by rapid accretion of the main promontory by more than 600 m/yr. Rates of change were more subdued in the Chittagong and Cox’s Bazar coastal zones of southeast Bangladesh. Islands in the Meghna estuary were especially dynamic; Hatiya Island accreted along some of its shoreline by 50 km2 between 1989 and 2009, but lost 65 km2 through erosion elsewhere, resulting in the island moving south. Similar trends were observed on adjacent islands. The overall area changed relatively little across the entire coastline over the 20-year period with accretion of up to 315 km2, countered by erosion of about 307 km2.Bangladesh, at the confluence of the sediment-laden Ganges and Brahmaputra Rivers, supports an enormous and rapidly growing population (>140 million in 2011), across low-lying alluvial and delta plains that have accumulated over the past few thousand years. It has been identified as one of the most vulnerable places in the world to the impacts of climate change and sea-level rise. Although abundant sediment supply has resulted in accretion on some parts of the coast of Bangladesh, others are experiencing rapid erosion. We report a systematic assessment of rates of shoreline change over a 20-year period from 1989 to 2009, using Landsat satellite images with pixel resolution of 30 m on the ground. A Band ratio approach, using Band-5 divided by Band-2, discriminated the water line on images that were largely cloud-free, adequately registered, and at comparable tidal stages. Rates of shoreline change were calculated for >16,000 transects generated at 50 m intervals along the entire mainland coastline (>1,100 km) and major islands, using the End Point Rate (EPR) method in the Digital Shoreline Analysis System (DSAS) extension in ArcGIS®. Erosion characterises most of the seaward margin of the Sundarbans in western Bangladesh. Retreat rates of up to 20 m/yr are typical, with little evidence that local devastation of the mangrove fringe by Cyclone Sidr in November 2007 had resulted in uncharacteristic long-term rates of retreat where it made landfall. Erosion exceeded accretion in the Barguna Patuakhali coastal zone, most of which eroded at up to 20 m/yr, but with truncation of the southern tip of the Patharghata Upazila at up to 100 m/yr. In Bhola, erosion at rates of up to 120 m/yr were observed along much of the coast, but in the Noakhali Feni coastal zone, similar rates of erosion were balanced by rapid accretion of the main promontory by more than 600 m/yr. Rates of change were more subdued in the Chittagong and Cox’s Bazar coastal zones of southeast Bangladesh. Islands in the Meghna estuary were especially dynamic; Hatiya Island accreted along some of its shoreline by 50 km2 between 1989 and 2009, but lost 65 km2 through erosion elsewhere, resulting in the island moving south. Similar trends were observed on adjacent islands. The overall area changed relatively little across the entire coastline over the 20-year period with accretion of up to 315 km2, countered by erosion of about 307 km2.
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
Estimation of Areal Changes along the Coastline of Bangladesh due to Erosion and Accretion
International Journal of Engineering Sciences, 2019
The present study focuses on the entire coastline of Bangladesh, which was analyzed for the last thirty years, with a five years' interval in between, to identify the changes in the shoreline position due to erosion or accretion. Shoreline positions for the time period 1989-2019, were manually digitized using multi-temporal Landsat satellite images of 30m resolution and comparable tidal conditions. A polygon-based approach was then employed in Arc GIS to determine the areal changes in the three different exposed coastal zones. The central zone was found to be the most dynamic in terms of both erosion and accretion. The western zone was mostly characterized by erosion, whereas only the eastern zone experienced a net land gain in this time span. Periodic reversal from erosion or accretion was also noted in several locations. The outcome of this study regarding the general trend (erosional or depositional) along the coastline, is expected to aid the proper planning and land management of the coastal zones in Bangladesh.