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Delineation of sensitive coastal zone of northern Ramanathapuram coast,Tamilnadu,India,using a GIS approach

Geodesy and Geodynamics 2022年第5期13卷 456-463页

作者： Gurugnanam Balasubramanian Sreechitra Suresh Santonu Goswami Bairavi Swaminathan Glitson Francis Pereira Centre for Applied Geology The Gandhigram Rural Institute-Deemed to Be UniversityDindigulTamil NaduIndia National Remote Sensing Centre India

This research aims to assess the sensitive coastal zones by analyzing the shoreline changes such as accretion and erosion in the eastern coastal part of Ramanathapuram District,Tamil Nadu,*** study focused on Mandapam,Pirappanvalsai,Enmanamcondam,Nagachi,Terbogi,Athyuthu,Chitrakkottai,Pathengal,Attangarai,Alagankulam,and Devipattinam *** of these areas are distinguished as highly sensitive ecological *** erosion of an area leads to irreplaceable disturbances to ***,erosion and accretion studies are top priorities when studying the coastal *** addition to GIS technology,which has been widely used in the past 20 years,the End Point rate(EPR)and linear regression rate(LRR)analyses were conducted to better understand the shoreline *** stability of the coastal region was analyzed by observing the slope variations of the beach during the profile *** the study,we analyzed that the Quaternary deposits of sand are the dominant geological feature of the study *** reefs and salt pans are highly distributed along the coastal *** coast of Mandapam village has been detected as a highly sensitive region,with an average erosion rate of-3.1 m/yr and an average accretion rate of 1.22 m/yr,resulting in high erosion and low *** coast is a steep coast with an average slope angle of 0.24°.This study provides insight into sustainable coastal zone management.

关键词： End point rate linear regression rate Geographic information system Beach profile Ramanathapuram

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Long-term coastal erosion assessment along the coast of Karnataka,west coast of India

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International Journal of Sediment Research 2019年第4期34卷 335-344页

作者： K.Sowmya M.Dhivya Sri Aparna S.Bhaskar K.S.Jayappa Department of Marine Geology Mangalore University Department of Geography University of Madras Department of Civil Engineering SRM Institute of Science and Technology

Coastal areas are always under frequent threat from various natural processes and man-induced *** 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, *** natural processes like long shore drift, seasonal variation, etc. are factors affecting the shoreline change along the Karnataka coast.

关键词： Karnataka coast Landsat images Erosion linear regression rate End Point rate

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Analysis of Shoreline Changes in Ikoli River in Niger Delta Region Yenagoa,Bayelsa State Using Digital Shoreline Analysis System(DSAS)

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Journal of Marine Science 2022年第1期4卷 34-42页

作者： Egai Ayibawari Obiene Eteh Desmond Rowland Inko-Tariah Ibiso Michael Department of Geology Niger Delta UniversityWilberforce IslandBayelsa StateNigeria Department of Geography and Environmental Management Rivers State UniversityRivers StateNigeria

The use of Digital Shoreline Analysis System was used to determine shoreline changes in Ikoli River,Yenagoa,Bayelsa *** data were extracted from satellite imagery over thirty years(1991-2021).The basis of this study is to use Digital Shoreline Analysis System to determine erosion and accretion *** result reveals that the average erosion rate in the study area is 1.16 m/year and the accretion rate is 1.62 m/year along the Ikoli River in Ogbogoro Community in Yenagoa,Bayelsa *** mean shoreline length is 5.24 km with a baseline length of 5.2 km and the area is classified into four zones to delineate properly area of erosion and accretion based on the five class of linear regression rate,endpoint rate and weighted linear rate of which zone Ⅰ contain very high erosion and high erosion with an area of landmass 255449.93 m^(2) of 38%,zone Ⅱ contain moderate accretion,very high accretion and high accretion with a land area of 1666816.46 m^(2) with 24%,zone Ⅲ has very high erosion and high erosion with an area of landmass 241610.85 m^(2) of 34% and zone Ⅳ contain moderate accretion and high accretion with land area 30888.08 m^(2) with 4%.Out of the four zones,zone Ⅰ and Ⅱ were found to be eroding with 72% and zone Ⅱ and Ⅳ contain accretion with 28%.The result shows that 44% of the area have been ***,coastal engineers,planners,and shoreline zone management authorities can use DSAS to create more appropriate management plans and regulations for coastal zones and other coastal parts of the state with similar geographic features.

关键词： Satellite imagery Erosion Accretion Yenagoa linear regression rate Endpoint rate Weighted linear rate Digital Shoreline Analysis System

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