Long-term coastal erosion assessment along the coast of Karnataka,west coast of India |
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| Authors: | K.Sowmya M.Dhivya Sri Aparna S.Bhaskar K.S.Jayappa |
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| Affiliation: | 1. Department of Marine Geology, Mangalore University, Karnataka, India;2. Department of Geography, University of Madras, Chennai, India;3. Department of Civil Engineering, SRM Institute of Science and Technology, Chennai, India;4. Department of Marine Geology, Mangalore University, Karnataka, India;1. Faculty of Geology, VNU University of Science, Vietnam National University, Hanoi 334 Nguyen Trai, Thanh Xuan, Hanoi, Viet Nam;2. Faculty of Marine and Coastal Engineering, Thuyloi University, 175 Tay Son, Dong Da, Hanoi, Vietnam;3. SedTrend Analysis Limited, 7236 Peden Lane, Brentwood Bay, BC, Canada V8M1C5;4. Faculty of Meteorology, Hydrology and Oceanography, VNU University of Science, Vietnam National University, Hanoi, 334 Nguyen Trai, Thanh Xuan, Hanoi, Vietnam;1. Department of Civil Engineering, Case Western Reserve University, 2104 Adelbert Road, Bingham 269, Cleveland, OH 44106-7201, United States;2. Department of Civil Engineering, Case Western Reserve University, 2104 Adelbert Road, Bingham 206, Cleveland, OH 44106-7201, United States |
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| Abstract: | Coastal areas are always under frequent threat from various natural processes and man-induced activities.Coastal erosion is recognized as the permanent loss of land along the shoreline resulting in the transformation of the coast. The current study focuses on long-term coastal erosion analysis of the entire Karnataka coast using Remote Sensing, Geographical Information System(GIS), Linear Regression Rate(LRR), and End Point Rate(EPR) techniques. Analysis of 26(1990 to 2016) years of erosion using Landsat images by the use of the Digital Shoreline Analysis System(DSAS) tool has been done. The results show a high erosion rate at Ullal during this period(LRR-1.3 m/yr) and accretion at Devbagh(LRR 3.2 m/yr). The southern Karnataka coast faces severe erosion especially at Ullal, where the settlement is high. At Thanirbhavi, Mukka, Kota,and Om Beaches erosion also is noticed. Both anthropogenic activities like ports, seawalls, breakwaters, etc.and natural processes like long shore drift, seasonal variation, etc. are factors affecting the shoreline change along the Karnataka coast. |
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| Keywords: | Karnataka coast Landsat images Erosion Linear Regression Rate End Point Rate |
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