GIS-Based Analysis and Modeling of Coastline Erosion and Accretion along the Coast of Sindh Pakistan

Hashmi, Syed Ghulam Mohayud Din; Ahmad, Sajid Rashid

doi:10.4172/2473-3350.1000455

Cited by 20 publications

(14 citation statements)

References 10 publications

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“…The sector between Waddi/Khuddi and Dabbo creeks in the Mirpur-Sakro subzone is found to be highly erosional and receding at a rate reaching up to 70 m/yr during the last three decades. This result also agrees with earlier observations from Giosan et al [24] and Hashmi and Ahmad [57], who showed that this sector is eroding at very high and similar rates during the post-damming period, mainly due to a reduction in the sediment influx to the Indus River and SWI. Towards the farther east, the coastal sector between Dabbo and Chhan creeks covering the Ghorabari administrative unit also seems to be receding at an average rate of 15 m/yr, significantly less compared to the subzone Mirpur Sakro However, the maximum erosion rate in Ghorabari coastline segment is found to be increased (up to 50 m/yr in most parts).…”

Section: Ir West Zonesupporting

confidence: 93%

Three Decades of Coastal Changes in Sindh, Pakistan (1989–2018): A Geospatial Assessment

et al. 2019

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Coastal erosion endangers millions living near-shore and puts coastal infrastructure at risk, particularly in low-lying deltaic coasts of developing nations. This study focuses on morphological changes along the~320-km-long Sindh coastline of Pakistan over past three decades. In this study, the Landsat images from 1989 to 2018 at an interval of 10 years are used to analyze the state of coastline erosion. For this purpose, well-known statistical approaches such as end point rate (EPR), least median of squares (LMS), and linear regression rate (LRR) are used to calculate the rates of coastline change. We analyze the erosion trend along with the underlying controlling variables of coastal change. Results show that most areas along the coastline have experienced noteworthy erosion during the study period. It is found that Karachi coastline experienced 2.43 ± 0.45 m/yr of erosion and 8.34 ± 0.45 m/yr of accretion, while erosion on the western and eastern sides of Indus River reached 12.5 ± 0.55 and 19.96 ± 0.65 m/yr on average, respectively. Coastal erosion is widespread along the entire coastline. However, the rate of erosion varies across the study area with a general trend of erosion increasing from west to east in the Indus Delta region (IDR), and the highest average erosion rate is 27.46 m/yr. The interdecadal change during 1989-periods depicted an increasing linear trend (R 2 = 0.78) from Karachi to Indus River (IR) East zone. The spatial trend from west to east is positively correlated with mean sea level rise, which has increased from 1.1 to 1.9 mm/year, and negatively correlated with topographic slope, which is found to be decreasing eastward along the coastline. The findings necessitate appropriate actions and have important implications to better manage coastal areas in Pakistan in the wake of global climate change.

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Section: Ir West Zonesupporting

confidence: 93%

Three Decades of Coastal Changes in Sindh, Pakistan (1989–2018): A Geospatial Assessment

et al. 2019

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“…Analysis, mapping, monitoring, and forecasting of coastline changes by field measurements and aerospace methods are important for integrated coastal zone management and planning, resource management, environmental research, and sustainable development (Aryastana et al, 2018;Hashmi and Ahmad, 2018). Application of Geographic Information Systems and statistical algorithms, implemented in GIS environment, and remote sensing (space images with different resolutions, unmanned aerial vehicle images, etc.)…”

Section: Methodsmentioning

confidence: 99%

“…Application of Geographic Information Systems and statistical algorithms, implemented in GIS environment, and remote sensing (space images with different resolutions, unmanned aerial vehicle images, etc.) for detailed analysis of short and long-term changes in coastline dynamics, provide ample opportunities for forecasting and cartographic description of coastline changes, based on established models (Hashmi and Ahmad, 2018;Dominici, 2020).…”

Section: Methodsmentioning

confidence: 99%

“…Being located at the physical contact of land and water basin (Fu et al, 2017;Alicandro et al, 2019;Pugliano et al, 2019;Liu, 2017;Appeaning et al, 2008), coastal zones are natural territories with a complex geological-geomorphological structure, unique ecological environment, biological diversity and climatic conditions (Ashis, 2002;Zollini et al, 2020). In recent times, coastal areas have become vulnerable to the effects of natural disasters (typhoons, tornadoes, tsunamis, abrasions, floods, etc.)…”

Section: Introductionmentioning

confidence: 99%

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Detection of coastal dynamics depending on the Caspian Sea level change using remote sensing data: A case study in the Kura geomorphological sub-region (Azerbaijan)

Gasimov¹

2021

Acta Geodynamica Et Geomaterialia

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Based on the analysis performed in the Kura geomorphological sub-region of the Caspian coastal zone, it was determined that the sea level rise of 2.43 m in 1976-1996 caused an average annual rate of erosion processes about 75 times higher than accumulation processes. In 1996-2019, the stabilization and the following drop of the sea level of 1.39 m led to an average annual rate of accumulation processes up to 14 times higher than the average annual rate of erosion processes. This pattern is observed along the entire coastline of those periods. Erosion processes in the initial stage increased the indentation and length of the coastline by almost 2 times, and in the next stage the intensification of accumulation processes resulted in the smoothing and reduction of the coastline by 35 %. Statistical analysis of coastlines was carried out by processing Landsat satellite images for 1976-2019; each coastline was divided into 14 segments according to geomorphological zones and their morphostructures in the study area. The development forecast for the next 10 and 20 years is provided.

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“…In latest years, the coastal zone has been exposed to pressure and process of changes (Rahisha et al, 2016), and coastal erosion and accretion have long been important processes occurring in many coastal places around the world (Chowdhury and Tripathi, 2013). So, shoreline mapping and monitoring is a very important tool for sustainable coastal development (Hashmi and Ahmad, 2018). Coastal erosion is always accompanied by the shoreward recession of the shoreline and the loss of land area (Saravanan et al, 2014) therefore it has many bad effects on the coastal environment, causing suffering local economies (Bio et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Coastal Erosion Assessment of the Nile Delta Coast using Remote Sensing, GIS, and Modified Coastal Vulnerability Index

Abdelaty

2021

Alexandria Science Exchange Journal

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The coastal zones are very much dynamic and are changing very fast, so it is completely important to study them in a temporal domain, for which remote sensing and GIS are the best tools. The coastal zone along the Governorates of Kafr El Sheikh, Dakahlia, and Damietta in north Egypt are reported to be facing serious environmental challenges. This study evaluates the coastline erosion and accretion and coastal vulnerability index (CVI) along these three Governorates, with a total length of 153Km over the past 34 years are analyzed using satellite images of TM 1984, ETM+ 2001, and ASTER 2018. The results showed that the study area was exposed to remarkable and non-expected changes over the study periods. Erosion and accretion were found variable over time and place, ranging from 0.14 ha/year in Dakahlia governorate during 1984-2001 to 66.12 ha/year in Kafr El Sheikh Governorate during 2001-2018 for erosion, and from 3.15 ha/year in Dakahlia Governorate at 2001-2018 to 42.45 ha/year in Kafr El Sheikh Governorate at 1984-2001 for accretion. Total land loss due to erosion as high as about 2034.68 ha of shoreline, and land gain as high as about 1459.71 ha of coastline was estimated in the study area with a net of lost lands of about 574.97 ha. In general, Kafr El Sheikh Governorate was more affected by erosion. According to Modified CVI, about 9.66%, 11.03%, 33.10%, and 46.21% of the length of the coastline is classified as very high, high, moderate, and low vulnerability, respectively.

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GIS-Based Analysis and Modeling of Coastline Erosion and Accretion along the Coast of Sindh Pakistan

Cited by 20 publications

References 10 publications

Three Decades of Coastal Changes in Sindh, Pakistan (1989–2018): A Geospatial Assessment

Three Decades of Coastal Changes in Sindh, Pakistan (1989–2018): A Geospatial Assessment

Detection of coastal dynamics depending on the Caspian Sea level change using remote sensing data: A case study in the Kura geomorphological sub-region (Azerbaijan)

Coastal Erosion Assessment of the Nile Delta Coast using Remote Sensing, GIS, and Modified Coastal Vulnerability Index

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