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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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Study on Headland-Bay Sandy Coast Stability in South China Coasts

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China Ocean Engineering 2011年第1期25卷 1-13页

作者：于吉涛陈子燊 Department of Water Resources and Environment Geography and Planning SchoolSun Yat-sen University

Headland-bay beach equilibrium planform has been a crucial problem abroad to long-term sandy beach evolution and stabilization, extensively applied to forecast long-term coastal erosion evolvement and the influences of coastal engineering as well as long-term coastal management and protection. However, little concern focuses on this in China. The parabolic relationship is the most widely used empirical relationship for determining the static equilibrium shape of headland-bay beaches. This paper utilizes the relation to predict and classify 31 headland-bay beaches and concludes that these bays cannot achieve the ultimate static equilibrium planform in South China. The empirical bay equation can morphologically estimate beach stabilization state, but it is just a referential predictable means and is difficult to evaluate headland-bay shoreline movements in years and decades. By using Digital Shoreline Analysis System suggested by USGS, the rates of shoreline recession and accretion of these different headland-bay beaches are quantitatively calculated from 1990 to 2000. The conclusions of this paper include that （a） most of these 31 bays maintain relatively stable and the rates of erosion and accretion are relatively large with the impact of man-made constructions on estuarine within these bays from 1990 to 2000; （b） two bays, Haimen Bay and Hailingshan Bay, originally in the quasi-static equilibrium planform determined by the parabolic bay shape equation, have been unstable by the influence of coastal engineering; and （c） these 31 bays have different recession and accretion characters occuning in some bays and some segments. On the one hand, some bays totally exhibit accretion, but some bays show erosion on the whole. Shanwei Bay, Houmen Bay, Pinghai Bay and Yazhou Bay have the similar planforms, characterized by less accretion on the sheltering segment and bigger accretion on the transitional and tangential segments. On the other hand, different segments of some bays

关键词： Headland-bay beaches parabolic bay shape equation digital shoreline analysis system end point rate

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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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