remote sensing Article Three Decades of Coastal Changes in Sindh, Pakistan (1989–2018): A Geospatial Assessment Shamsa Kanwal 1,* , Xiaoli Ding 1 , Muhammad Sajjad 2,3 and Sawaid Abbas 1 1 Department of Land Surveying and Geo-Informatics, The Hong Kong Polytechnic University, Hong Kong, China;
[email protected] (X.D.);
[email protected] (S.A.) 2 Guy Carpenter Asia-Pacific Climate Impact Centre, School of Energy and Environment, City University of Hong Kong, Hong Kong, China;
[email protected] 3 Department of Civil and Environmental Engineering, Princeton University, Princeton, NJ 08542, USA * Correspondence:
[email protected] Received: 3 November 2019; Accepted: 13 December 2019; Published: 18 December 2019 Abstract: 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.