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

2022 ◽  
Vol 4 (1) ◽  
Author(s):  
Egai Ayibawari Obiene ◽  
Eteh Desmond Rowland ◽  
Inko-Tariah Ibiso Michael
Keyword(s):  
Baseline Length ◽  
Coastal Zones ◽  
Land Area ◽  
Shoreline Changes ◽  
Zone Management ◽  
Digital Shoreline Analysis System ◽  
Erosion And Accretion ◽  
Zone Ii ◽  
Analysis System ◽  
Very High

The use of Digital Shoreline Analysis System was used to determine shoreline changes in Ikoli River, Yenagoa, Bayelsa State. Shoreline 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 areas. The 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 State. The 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 m2 of 38%, zone II contain moderate accretion, very high accretion and high accretion with a land area of 1666816.46 m2 with 24%, zone III has very high erosion and high erosion with an area of landmass 241610.85 m2 of 34 % and zone IV contain moderate accretion and high accretion with land area 30888.08 m2 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 eroded. Therefore, 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.

Rapid detection of changes in the riverbanks of Laigiang river of the South Central Coast Vietnam: A methodology based on Digital Shoreline Analysis System and Sentinel-2

2021 ◽  
Vol 14 (11) ◽  
pp. 13-24
Author(s):  
Anh Tu Ngo ◽  
Stéphane Grivel ◽  
Thai Le Phan ◽  
Huu Xuan Nguyen ◽  
Trong Doi Nguyen
Keyword(s):  
Linear Regression ◽  
Shoreline Change ◽  
The South ◽  
Central Coast ◽  
Shoreline Changes ◽  
South Central ◽  
Digital Shoreline Analysis System ◽  
Analysis System ◽  
End Point Rate ◽  
Sentinel 2

The research focuses on using Sentinel-2 that can be integrated with the Digital Shoreline Analysis System (DSAS) as an effective tool for the determination of changes in the riverbanks and using linear regression to predict shoreline changes. The research applied the assessment of shoreline changes in the period of 2015- 2020 and forecast to 2025 in Laigiang river of the South Central Coast region of Vietnam. Based on the DSAS tool, parameters such as Shoreline Change Envelope (SCE), Net Shoreline Movement (NSM), End Point Rate (EPR) and Linear Regression Rate (LRR) were determined. The analysis results show that the accretion process in the Laigiang river in the period of 2015-2020 with the accretion area ranges from 81.47 ha. Meanwhile, the area of shoreline erosion only fluctuates around 54.42 ha. The rhythm of evolution is a determinant element for this transitional system.

scholarly journals Shoreline Change Analysis of Pontang Cape of Serang Regency of Banten Province

Omni-Akuatika ◽  
2020 ◽  
Vol 16 (2) ◽  
pp. 90
Author(s):  
Abdurrahman Al Farrizi ◽  
Ankiq Taofiqurohman ◽  
Subiyanto Subiyanto
Keyword(s):  
Coastal Zone ◽  
Shoreline Change ◽  
Sand Mining ◽  
Change Analysis ◽  
Factors Affecting ◽  
Shoreline Changes ◽  
Sea Sand ◽  
Digital Shoreline Analysis System ◽  
Analysis System ◽  
Shoreline Change Analysis

Coastal areas, being vulnerable to environmental problems, have one of the most frequent problems which are the change in the shorelines. Shoreline changes, namely abrasions, can cause problems such as land degradations or loss of land in a coastal zone. This problem occurs in many areas, one of which is Pontang Cape. This study aims to determine the distance and rate of shoreline changes that occured in the Cape and its surroundings, as well as explaining the analysis points based on similar studies that had been conducted. This research used ArcMap software and Digital Shoreline Analysis System (DSAS) toolset to determine the distance and rate of shoreline changes for 19 years (1999-2018). Based on the results, there were two shoreline segments where different phenomena of shoreline change took place, namely Banten Bay (accretion) and Pontang Cape-Lontar (abrasion). The most likely causes of changes in the shorelines are sediment runoffs from rivers that lead to bay and sediment transports that affect Banten Bay accretions, while sea sand mining and conversions of mangrove swamps into fishery ponds are factors affecting abrasions in Pontang Cape.Keywords: Abrasion, Accretion, Pontang Cape, Banten Bay, DSAS

scholarly journals Caracterização dos setores erosivos e deposicionais da linha de costa de Icapuí (CE) com base em produtos de sensoriamento remoto e técnicas de geoprocessamento

2020 ◽  
Vol 13 (1) ◽  
pp. 143
Author(s):  
Cláudio Ângelo Da Silva Neto ◽  
Cynthia Romariz Duarte ◽  
Michael Vandesteen Silva Souto ◽  
Eduardo Viana Freires ◽  
Willamys Rangel Nunes de Sousa ◽  
...  
Keyword(s):  
Far East ◽  
Shoreline Change ◽  
Temporal Analysis ◽  
Coastal Zones ◽  
Dynamic Features ◽  
Coastal Morphology ◽  
Erosion And Deposition ◽  
Digital Shoreline Analysis System ◽  
Analysis System ◽  
Landsat Satellite

A importância das zonas costeiras implica na necessidade de contínuos estudos relacionados ao monitoramento de seus processos. Neste contexto, a linha de costa representa uma das feições mais dinâmicas, e sua variabilidade é um indicador da erosão ou deposição costeira. A fim de avaliar as tendências de mudança da linha de costa do município de Icapuí, localizado no extremo leste do estado do Ceará, este trabalho envolveu a utilização de imagens orbitais do satélite Landsat, compondo uma série temporal de 30 anos com intervalos de cinco anos entre cada cena. Foram aplicados o Método de Mudança do Polígono e o Digital Shoreline Analysis System (DSAS) na caracterização da linha de costa, quantificando suas taxas de variação e balanço sedimentar em área. A área total foi setorizada em quatro porções, utilizando a morfologia costeira como critério de segmentação. Os resultados indicaram a existência de três hotspots de erosão e deposição, relacionados à desembocadura do riacho Arrombado, no setor leste; à desembocadura do estuário Barra Grande, que separa os setores centrais leste e oeste; e ao promontório de Ponta Grossa, que condiciona uma inflexão da linha de costa no setor oeste. Cada um destes setores apresenta dinâmica de deposição a barlamar e erosão a sotamar, com destaque para os processos acentuados de retrogradação entre as praias de Barreiras de Baixo e Barrinhas, no setor central oeste, e a forte dinâmica deposicional da praia de Ponta Grossa, no setor oeste. Identification of the erosive and depositional sectors of the Icapuí (CE) shoreline based on remote sensing products and geoprocessing techniques A B S T R A C TThe importance of coastal zones implies the need for continuous studies related to the monitoring of their processes. In this context, the shoreline represents one of the most dynamic features, and its variability is an indicator of erosion or coastal deposition. In order to evaluate the changing trends of the coast of the Icapuí city, located in the far east of the state of Ceará, this work involved the use of Landsat satellite orbital images, composing a 30-year time series with five-year intervals between each scene. The Polygon Change Method and the Digital Shoreline Analysis System (DSAS) were applied to characterize the shoreline, quantifying its variation rates and sedimentary balance in area. The total area was divided into four portions, using coastal morphology as a segmentation criterion. The results indicated the existence of three erosion and deposition hotspots, related to the Arrombado stream inlet, in the eastern sector; the Barra Grande estuary inlet, which separates the central east and west sectors; and the Ponta Grossa promontory, which conditions a shoreline inflection in the western sector. Each of these sectors has a deposition dynamic to updrift and erosion to downdrift, with prominence to the accentuated processes of retrogradation between the Barreiras de Baixo and Barrinhas beaches, in the central west sector, and the strong depositional dynamics of Ponta Grossa beach, in the west sector.Keywords: coastal erosion; shoreline change; temporal analysis.

scholarly journals SPATIAL ANALYSIS OF SHORELINE CHANGES IN THE COASTAL OF SUBANG DISTRICT, WEST JAVA

2012 ◽  
Vol 4 (2) ◽  
Author(s):  
Ankiq Taofiqurohman ◽  
M. Furqon Azis Ismail ◽  
M. Furqon Azis Ismail ◽  
M. Furqon Azis Ismail
Keyword(s):  
Regression Analysis ◽  
Spatial Analysis ◽  
Field Survey ◽  
Shoreline Change ◽  
Residential Construction ◽  
Maximum Width ◽  
Shoreline Changes ◽  
Digital Shoreline Analysis System ◽  
Analysis System ◽  
System Program

<p>ABSTRACT</p> <p>Observation of coastal shoreline changes in the Subang District was conducted using Digital Shoreline Analysis System Program based on the satelite images of Landsat TM from 1996 to 2010. The purpose of this study was to determine the distance of shoreline change. Methods used in this study were field survey and regression analysis of shoreline data. The results of this study indicated the existence of a region experiencing accretion and abrasion. The maximum width of accretion of the coast was 1,051.55 meter while the maximum abration was 1,206.83 meter. Coastal shoreline change in Subang District occurred mainly due to the development activities such as residential construction, altering the coastal mangrove to ponds and rice paddies, and sediment transport from the river around Subang District.</p> <p>Keywords: shoreline, Subang District, satelite images, accretion, abration</p>

SPATIAL ANALYSIS OF SHORELINE CHANGES IN THE COASTAL OF SUBANG DISTRICT, WEST JAVA

2012 ◽  
Vol 4 (2) ◽  
Author(s):  
Ankiq Taofiqurohman ◽  
M. Furqon Azis Ismail ◽  
M. Furqon Azis Ismail ◽  
M. Furqon Azis Ismail
Keyword(s):  
Regression Analysis ◽  
Spatial Analysis ◽  
Field Survey ◽  
Shoreline Change ◽  
Residential Construction ◽  
Maximum Width ◽  
Shoreline Changes ◽  
Digital Shoreline Analysis System ◽  
Analysis System ◽  
System Program

ABSTRACT Observation of coastal shoreline changes in the Subang District was conducted using Digital Shoreline Analysis System Program based on the satelite images of Landsat TM from 1996 to 2010. The purpose of this study was to determine the distance of shoreline change. Methods used in this study were field survey and regression analysis of shoreline data. The results of this study indicated the existence of a region experiencing accretion and abrasion. The maximum width of accretion of the coast was 1,051.55 meter while the maximum abration was 1,206.83 meter. Coastal shoreline change in Subang District occurred mainly due to the development activities such as residential construction, altering the coastal mangrove to ponds and rice paddies, and sediment transport from the river around Subang District. Keywords: shoreline, Subang District, satelite images, accretion, abration

Perubahan Garis Pantai Menggunakan Citra Satelit Landsat di Pesisir Kecamatan Sayung, Kabupaten Demak

2021 ◽  
Vol 10 (2) ◽  
pp. 299-305
Author(s):  
Yualita Prasida Ramadhani ◽  
Ibnu Praktikto ◽  
Chrisna Adhi Suryono
Keyword(s):  
Remote Sensing ◽  
Average Rate ◽  
Rate Of Change ◽  
Northern Coast ◽  
Shoreline Changes ◽  
Coastline Change ◽  
Sensing Technology ◽  
Digital Shoreline Analysis System ◽  
Analysis System

Wilayah pesisir Kabupaten Demak yang terletak di bagian utara Pantai Jawa merupakan yang rentan terhadap perubahan garis pantai. Perubahan yang serius ini perlu dilakukan pemantauan terus menurus. Penelitian ini dilakukan untuk memperoleh informasi tentang perubahan garis pantai yang disebabkan oleh tingkat abrasi dan akresi yang terjadi di Kecamatan Sayung, Kabupaten Demak pada tahun 2013-2020. Metode penelitian ini dengan menggunakan metode deskriptif studi kasus dengan menggunakan teknologi penginderaan jauh. Metode penginderaan jauh yang digunakan untuk mengetahui perubahan garis pantai adalah dengan metode overlay (tumpang susun) garis pantai pada tahun yang berbeda dan Digital Shoreline Analysis System (DSAS). Hasil penelitian menunjukkan garis pantai Kecamatan Sayung dengan panjang pantai 20.953,59 m, telah mengalami abrasi pantai seluas 141,49 ha dan akresi sebesar 36,61 ha. Sehingga persentase tingkat abrasi sebesar 82% dan akresi sebesar 18%. Secara keseluruhan, rata-rata laju abrasi yang terjadi dalam kurun waktu periode 2013-2020 adalah sebesar 13,08 meter/tahun dan laju akresi sebesar 8,22 meter/tahun. Perubahan garis pantai yang terjadi dari tahun 2013 hingga tahun 2020 lebih banyak mengalami abrasi jika dibandingkan dengan akresi. The coastal area of Demak Regency, which is located on the northern coast of Java, is  vulnerable to shoreline changes. This serious change is necessary for ongoing monitoring. This research was conducted to obtain information about coastline change in coastal Sayung District of Demak Regency in 2013 until 2020. This research method is done by using descriptive method of case study by using remote sensing technology. The remote sensing method used to determine shoreline changes is overlay method and Digital Shoreline Analysis System (DSAS) in different years. Based on the research results can be seen the rate of change of coastline length of 20.953,59 m, shoreline changes that occur in the form of abrasion of 141,49 ha and changes in the form of accretion of 36,61 ha. So that the proportion of the abrasion rate is 82% and the accretion is 18%.Overall, the average rate of abrasion that occurred in the 2013-2020 period was 13.08 meters / year and the accretion rate was 8.22 meters / year. Coastlines that occur from 2013 to 2020 more experienced abrasion process when compared to the accretion process.

scholarly journals DETECCIÓN DE CAMBIOS DE LA LÍNEA COSTERA AL NORTE DEL DISTRITO DE BUENAVENTURA MEDIANTE EL USO DE SENSORES REMOTOS

2017 ◽  
Vol 46 (1) ◽  
Author(s):  
María Alejandra Cifuentes Ossa ◽  
Leidy Viviana Rosero Henao ◽  
John Josephraj Selvaraj
Keyword(s):  
Salt Marshes ◽  
Shoreline Change ◽  
The United States ◽  
Shoreline Changes ◽  
Natural Processes ◽  
Northern District ◽  
Erosion And Accretion ◽  
Analysis System ◽  
End Point Rate ◽  
Colombian Pacific

This study focuses on detecting the magnitude of shoreline changes of the northern District ofBuenaventura, in the Colombian Pacific, over a 30-year period, on a coast where the geomorphologyincludes beaches, cliffs, estuaries, deltas and salt marshes. Satellite imagery (Landsat MSS, ETM + andOLI TIRS) were used to detect historical positions of the shoreline in order to identify the processes ofchange, in terms of erosion and accretion, from 1986 to 2015. Statistical analysis of changes was carriedout to estimate distances and shoreline change rates, using a tool developed by the United States GeologicalSurvey (USGS): Digital Shoreline Analysis System (DSAS). The statistics on Net Shoreline Movement(NSM) and End Point Rate (EPR), provided information about the magnitude and trends of changes in theshoreline. The results indicate that areas with more advanced processes of accretion correspond to sectorsin Boca San Juan, Puerto España and near to La Concepción beach in the Department of Valle del Caucaand in the south of Chavica, in the Department of Chocó; all these sectors are located in the northern partof the study area. Also in the same sectors, particularly around Chavica, the most advanced processes oferosion were found, along with El Choncho beach and a small sector in the Malaga bay. Some sectors ofthe shoreline remained mostly stable, such as Malaga and Buenaventura Bays. Average shoreline changerate of (-) 0.21m per year was found, reflecting its erosive tendency with maximum EPR values 26.92mof accretion and (-) 21.01m for coastal erosion. Natural processes such as the influence of river dischargeand El Niño phenomenon, have contributed to these shoreline changes. The identified erosion and accretionprocesses can be recognized as priority areas of coastal management in the Colombian Pacific.

scholarly journals ANALISIS PERUBAHAN GARIS PANTAI DALAM MENDUKUNG KETAHANAN EKOSISTEM PESISIR

2020 ◽  
Vol 6 (2) ◽  
Author(s):  
Andik Isdianto ◽  
Ilham Maulana Asyari ◽  
Muchamad Fairuz Haykal ◽  
Faradhilah Adibah ◽  
Muhammad Javier Irsyad ◽  
...  
Keyword(s):  
Linear Regression ◽  
Coastal Ecosystems ◽  
Regression Rate ◽  
Shoreline Changes ◽  
End Point ◽  
Digital Shoreline Analysis System ◽  
Average Change ◽  
Analysis System ◽  
End Point Rate ◽  
Mangrove Conservation

Total luas Clungup Mangrove Conservation (CMC) adalah 177,24 ha, terdiri dari 71 ha mangrove, 10 ha terumbu karang dan 96,24 ha hutan lindung. Pada tahun 2020, selain pandemi COVID-19, wilayah Malang Selatan juga mengalami bencana lain yaitu banjir rob pada tanggal 26 Mei 2020. Hal tersebut mempengaruhi banyak hal termasuk perubahan garis pantai. Untuk mendukung ketahanan ekosistem pesisir, terutama perubahan garis pantai, perlu dilakukan penelitian tentang perubahan garis pantai selama 12 tahun terakhir (2008-2020). Perhitungan Net Shoreline Movement (NSM), Linear Regression Rate (LRR), dan End Point Rate (EPR) merupakan metode perhitungan perubahan garis pantai dalam metode Digital Shoreline Analysis System. Perhitungan regresi liner digunakan untuk mengukur tingkat perubahan garis pantai, metode yang digunakan adalah Linear Regression Rate (LRR) . Akresi tertinggi terjadi di pantai Tiga Warna dengan laju pertambahan rata-rata 0,11 meter / tahun dan jarak perubahan rata-rata 1,28 meter. Sedangkan abrasi tertinggi terjadi di Pantai Mini dengan laju abrasi rata-rata -0,33 meter / tahun dan jarak perubahan rata-rata -5,84 meter. Di pantai Gatra, abrasi dan akresi sama-sama tinggi. Informasi mengenai perubahan garis pantai dan prediksi perubahan garis pantai untuk kedepannya merupakan salah satu upaya yang dapat digunakan sebagai upaya awal untuk perlindungan Kawasan pesisir untuk mendukung ketahanan ekosistem pesisir. Kata kunci : Abrasi, akresi, digital shoreline analysis system, end point rate, net shoreline movement.  The total area of Clungup Mangrove Conservation (CMC) is 177.24 ha, consisting of 71 ha of mangroves, 10 ha of coral reefs and 96.24 ha of protected forest. In 2020, apart from the COVID-19 pandemic, the South Malang region also experienced another disaster, namely the tidal flood on May 26, 2020. This affected many things including changes to the coastline. To support the resilience of coastal ecosystems, especially changes in shorelines, it is necessary to conduct research on changes in coastlines over the last 12 years (2008-2020). Calculation of Net Shoreline Movement (NSM), Linear Regression Rate (LRR), and End Point Rate (EPR) is a method of calculating shoreline changes in the Digital Shoreline Analysis System method. Liner regression calculations are used to measure the rate of change in the shoreline, the method used is the Linear Regression Rate (LRR). The highest accretion occurs at Tiga Warna beach with an average growth rate of 0.11 meters / year and an average change distance of 1.28 meters. Meanwhile, the highest abrasion occurred at Pantai Mini with an average abrasion rate of -0.33 meters / year and an average change distance of -5.84 meters. At Gatra beach, abrasion and accretion are both high. Information about shoreline changes and predictions of changes in coastlines in the future is one of the efforts that can be used as an initial effort to protect coastal areas to support the resilience of coastal ecosystems. Keywords: Abrasion, Accretion, Digital Shoreline Analysis System, End Point Rate, Net Shoreline Movement.

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