scholarly journals Coastal Morphology Assessment and Coastal Protection

2021 ◽  
Vol 9 (7) ◽  
pp. 713
Author(s):  
Yoshimichi Yamamoto
Keyword(s):  
Coastal Protection ◽  
Coastal Morphology

Sediment-collecting in rivers and seas to secure a large amount of aggregate reduces the supply of earth and sand to coasts [...]

A strategy towards estimating a sediment budget for the Baltic Sea coastline of Schleswig-Holstein, Germany

2020 ◽  
Author(s):  
Tanita Averes ◽  
Klaus Schwarzer ◽  
Jacobus Hofstede ◽  
Arfst Hinrichsen ◽  
Hans-Christian Reimers ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Sediment Budget ◽  
Coarse Grained ◽  
Coastal Protection ◽  
Shore Protection ◽  
The Baltic Sea ◽  
Coastal Morphology ◽  
Protection Measures ◽  
Variable Character ◽  
The Baltic

<p>Sea level rise along with the changing climate leads to severe enhancement of hydrodynamic impact to coastlines worldwide. Along the Baltic Sea coast of Schleswig-Holstein (Germany), this leads to the erosion of exposed glacial cliffs (up to 30 % of the coastline) and abrasion platforms (unknown extend). Irreversible land loss and seafloor deepening are the consequences, causing socio-economic and environmental concerns in affected areas. However, the adjacent coastal sections benefit from the development as the mobilized material constitutes the main sediment source to the nearshore bar and beach systems. Here, temporal built up of nearshore bars and the deposition at sandspits and beaches functions as natural shore protection.</p><p>The heterogenous and dynamic morphology, exposition and geology of the cliff sections and their offshore continuation complicates system understanding and management of the Schleswig-Holstein coastline. The availability of coarse-grained sediments (sand, gravel, stones) from the poorly sorted glacial till, forming the cliffs, is comparatively low. This lack of obtained material suitable to build up a coastal morphology attributes a central role to the source areas and the quantification of the sediment budget regarding coastal preservation.</p><p>On this account we attempt to develop a strategy towards a classified coastal sediment budget, which is based on a comprehensive field and literature data base, addressing the highly variable character of the observed coastline described in morphological, morphodynamic, geological, sedimentological, hydrodynamic and anthropogenic parameters.</p><p>The coastline of Schleswig-Holstein is structured into 58 active cliff sections for individual description via categorized cliff profiles. Furthermore, 22 abrasion platforms are defined in the offshore region and characterized by descriptive summaries. The data summary reveals well investigated zones (e.g. Schönhagen, Stohl, Heiligenhafen, Brodten), serving as potential pilot areas for complementary studies, but also identifies study areas which require further research.</p><p>The literature values for past cliff retreat and eroded sediment volumes bear high uncertainties. This is due to the fact that former studies are based on unequal spatial extend of cliff sections, variable time intervals and differing methods. Further, computation of eroded material volumes is lacking important input parameters, e.g. the degree of compaction and the grain size distribution. This is considered for budget calculations and their confidence for individual coastal units in template form.</p><p>The current study compiles and visualizes the heterogenous data for further scientific applications. The project aims to support future studies on the sediment availability and transport in the near-shore system using hydrodynamic modelling and thus creates a sound scientific base for system understanding and new governmental regulations concerning coastal protection measures at the Schleswig-Holstein Baltic Sea.</p>

Coastal Stability and Micro Morphology; Disturbances due to Human Interventions along West Coast of India

2020 ◽  
Author(s):  
Rafeeque Mk ◽  
Akhil Thulasidharan ◽  
Mintu E George ◽  
Suresh Babu Ds ◽  
Prasad Tk
Keyword(s):  
Coastal Region ◽  
Coastal Hazards ◽  
Coastal Protection ◽  
Peninsular India ◽  
Coastal Morphology ◽  
Protection Measures ◽  
The World ◽  
Human Interventions ◽  
Kerala State ◽  
Micro Morphology

<p>Coastal areas are known as cradles of civilization from the beginning of human settlements and the coastal belts in tropics experience high density of population all over the world. Indian coastal region is one of the most populated coastal belts of the world. Kerala coastal region of South West Peninsular India hosts 2931 person per sq. km. Stability of coastal zone helps to prevent the intensity of coastal hazards like extreme waves, coastal flooding and coastal erosion, which is quite noticeable in the northern part of Kerala state, when compared to the southern coastal region. The paleo-shoreline of Kozhikode coast in northern Kerala is identified as 2.5 to 5 km landward from the modern shoreline in the Beypur – Kallayi sector, 1 to 2 km in the Kallayi – Korapuzha Sector and 1 to 2.5 km in the Korapuzha – Quilandi Sector. This proves that the area is an accreting one over the recent geological history. The sediment discharge of Chaliyar, Korapuzha, Kadalundi and Kallayi rivers along with micro morphology leads to the evolution and development of this coastal plain for last few centuries. Paleo channels of this area changed its direction in many places during Holocene – Pleistocene period under the tidal influence. Nearshore bottom features of the area got diversified with parallel and transverse bars, reefs, exposed and buried rocks. The major nearshore features are demarcated as Kadalur Cape, Thoovappara, Elathur Cape, Thikkodi reef, Kadalur reef, Anchorage reef, Coote reef, Calicut reef, Rocky It, Gilham rocks, Rocky points, Black rock and Puthiyangadi bay. As a fast growing urbanised coastal city of the state, the Kozhikkode coast line is subjected to intense human interventions and thereby adversely affect sustainability of the coastline. Construction of two major fishing harbours, vis. Puthiyappa and Quilandi and Beypur port in 1990s re-defined the coastal morphology and nearshore bottom features of the sector. Shoreline towards the south of Puthiyappa harbour and Beypur breakwater is accreted and vast beach was developed while the Quilandi harbour doesn’t have much influence on sediment drift. Rocky coast, sand bed, seasonal sand bar and exposed and buried rocks have been properly documented in the paper. Along with those natural features, the artificial landforms and coastal protection measures have been analysed for understanding the disturbances in the coastal stability of the area. One-meter contour of the bathymetry line runs parallel to the coast except in the near shore of the Elathur and Kadalur headlands. Current investigations show that 48 percent of the total coastline can be considered as stable (Quilandi - Korapuzha and Korapuzha – Kallayi sectors), while 36 percent is erosion prone (Kallayi – Beypur Sector) and the rest is accreting.</p>

scholarly journals Kajian Sosial Ekonomi SID Pantai Calang dan Pantai Krueng Sabee, Kota Aceh Jaya

2018 ◽  
Vol 1 (2) ◽  
pp. 23
Author(s):  
Sumarna Hasan
Keyword(s):  
Interest Rate ◽  
Economic Analysis ◽  
Coastal Area ◽  
Coastal Protection ◽  
Coastal Morphology ◽  
Crop Cultivation ◽  
Municipal Administration ◽  
Settlement Location ◽  
Banda Aceh ◽  
Made In

Town Calang besides area settlement location also as Calang municipal administration center with various activity of economics society. Around this area there are also fishery activity and fishpond as Coastal area fisherman society living of Calang. Effect of existence of Tsunami and earthquake have resulted changing coastal morphology where so that have resulted the resignment of coastline as for ± 100-200 m. Besides have eliminated coastal area, Tsunami have also eliminated some of joint streets pass by quickly Banda Aceh-Meulaboh which have location around this coast. Coastal protection of Calang and Krueng Sabee desides conducted with coastal building development, is also planned by coastal protection brand involved.  Coastal protection involved represent bekt green with Coconut crop cultivation and Mangrove. Coastal Protection made in which suited for applied at this study location is breakwater building. Result of calculation from economic analysis, this development within 25 years at interest rate 24% estimated to have NPV equal to 1.018.582.359,72 net B/C 1,131 and IRR is 26,89%.

Pemilihan Tipe Bangunan Pelindung Pantai di Desa Sikeli Berbasis Bahan Lokal

2020 ◽  
Vol 24 (1) ◽  
pp. 100-105
Author(s):  
Herawati Herawati ◽  
Muhammad Arsyad Thaha ◽  
Chairul Paotonan
Keyword(s):  
Analytical Hierarchy Process ◽  
Movement Pattern ◽  
Terrestrial Ecosystems ◽  
Coastal Protection ◽  
The North ◽  
Sea Wall ◽  
Hierarchy Process ◽  
Local Materials ◽  
Current Movement ◽  
Process Method

Abstrak Wilayah pesisir merupakan pertemuan antara wilayah laut dan wilayah darat, dimana daerah ini merupakan daerah interaksi antara ekosistem darat dan ekosistem laut yang sangat dinamis dan saling mempengaruhi. Tujuan penelitian ini adalah untuk menentukan material lokal yang potensial dapat digunakan sebagai bahan bangunan pelindung pantai dan memilih tipe bangunan pelindung pantai yang sesuai kondisi hidro-oseanografi di lokasi studi dengan metode Analythic Hierarchy Process. Lokasi penelitian berada di Provinsi Sulawesi Tenggara, tepatnya di Pulau Kabaena, Kecamatan Kabaena Barat Desa Sikeli kabupaten Bombana. Pulau Kabaena memiliki luas 873 km2. Secara geografis terletak antara 4°22’ 59,4” - 5°28’ 26,7” Lintang Selatan serta antara 121°27’46,7”-122°09’,4” Bujur Timur. Hasil penelitian menunjukkan perairan disepanjang tanjung perak sangat mempengaruhi hidro-oseonografi disekitar pantai desa Sikeli. Kondisi ini berpengaruh terhadap pola pergerakan arus dan tinggi gelombang datang disekitar pantai desa Sikeli. Tinggi gelombang rata-rata yang paling besar merambat dari arah barat sebesar 0.49 m dengan presentase kajadian sebesar 32.42 %, disusul arah barat laut sebesar 0.39 m (20.56 %), arah tenggara sebesar 0.31 m (8.72 %) arah barat daya sebesar 0.31 m (7.99 %), arah utara sebesar 0.20 m (6.94 %), arah timur sebesar 0.15 m (11.81 %), arah selatan sebesar 0.12 m (3.42 %), dan arah timur laut sebesar 0.11 m (8.15 %). Pengambilan keputusan untuk memilih tipe bangunan pelindung pantai dengan metode AHP (Analytical Hierarchy Process) untuk penanganan abrasi pesisir pantai desa Sikeli berbasis bahan lokal diperoleh bahwa alternatif bangunan dengan nilai keterpilihan yang tertinggi adalah detached breakwater (0,4432) disusul groin (0,2479), sea-wall (0,1700) dan revetment (0.1389). Detached breakwater berfungsi untuk menahan laju sedimen kearah laut, mengurangi ketinggian dan meredam energi gelombang dan tidak dibangun sepanjang garis pantai yang akan dilindungi sehingga kapal nelayan dapat ditambat dipesisir pantai dengan aman. Abstract The Selection Type of Coastal Protection Structures in Sikeli Village Based on Local Materials. The coastal area is a meeting point between the sea and land areas, where this area is an area of interaction between terrestrial ecosystems and marine ecosystems which are very dynamic and influence each other. The purpose of this research is to determine local materials that can be used as coastal protection materials and to select the type of coastal protection that is suitable for the hydro-oceanographic conditions in the study location using the Analythic Hierarchy Process method. The research location is in Southeast Sulawesi Province, precisely on Kabaena Island, Kabaena Barat District, Sikeli Village, Bombana Regency. Kabaena Island has an area of 873 km2. Geographically it is located between 4° 22' 59.4"- 5° 28' 26.7" South Latitude and between 121° 27' 46.7 "-122° 09' 4" Longitude East. The results showed that the waters along Tanjung Perak greatly affect the hydro-oseonography around the coast of Sikeli village. This condition affects the current movement pattern and the height of the incoming waves around the coast of Sikeli village. The largest average wave height propagating from the west is 0.49 m with a kajadian percentage of 32.42%, followed by the northwest direction of 0.39 m (20.56%), southeast direction of 0.31 m (8.72%) to the southwest of 0.31 m (7.99%), to the north of 0.20 m (6.94%), to the east of 0.15 m (11.81%), to the south of 0.12 m (3.42%), and to the northeast of 0.11 m (8.15%). The decision to choose the type of coastal protection using the AHP (Analytical Hierarchy Process) method for the coastal abrasion management model in Sikeli village based on local materials was obtained that the alternative building with the highest electability value was the detached breakwater (0.4432) followed by groins (0.2479), sea-wall (0.1700) and revetment (0.1389). The detached breakwater model which functions to restrain the sediment rate towards the sea, reduce the height and reduce wave energy and is not built along the coastline which will be protected so that fishing boats can be moored to the coast safely.

Propagation of Japanese Black Pine (Pinus thunbergii) Seedlings for Restoration of Coastal Protection Forest

2015 ◽  
Vol 69 (4) ◽  
pp. 366-368
Author(s):  
Naoki Negishi ◽  
Nobuaki Urata ◽  
Katsuhiko Nakahama ◽  
Akiyoshi Kawaoka
Keyword(s):  
Pinus Thunbergii ◽  
Coastal Protection ◽  
Black Pine ◽  
Protection Forest ◽  
Japanese Black Pine

ECOLOGICAL AND GEOMORPHOLOGICAL ASSESSMENT OF THE VULNERABILITY OF THE COASTS OF THE KARA SEA TO THE OIL SPILL

2017 ◽  
Author(s):  
Alexander Ermolov ◽  
Alexander Ermolov
Keyword(s):  
Oil Spill ◽  
Oil Spills ◽  
International System ◽  
Kara Sea ◽  
Coastal Protection ◽  
Sensitivity Index ◽  
Oil Spill Response ◽  
Expert Assessments ◽  
International Systems

International experience of oil spill response in the sea defines the priority of coastal protection and the need to identify as most valuable in ecological terms and the most vulnerable areas. Methodological approaches to the assessing the vulnerability of Arctic coasts to oil spills based on international systems of Environmental Sensitivity Index (ESI) and geomorphological zoning are considered in the article. The comprehensive environmental and geomorphological approach allowed us to form the morphodynamic basis for the classification of seacoasts and try to adapt the international system of indexes to the shores of the Kara Sea taking into account the specific natural conditions. This work has improved the expert assessments of the vulnerability and resilience of the seacoasts.

EVOLUTION OF SANDY BEACH IN THE CITY OF VARNA

2017 ◽  
Author(s):  
Dachev Veliko Z ◽  
Dachev Veliko Z
Keyword(s):  
Retrospective Review ◽  
Anthropogenic Impact ◽  
Sandy Beach ◽  
New Method ◽  
Coastal Protection ◽  
Area Growth ◽  
Long Time ◽  
The City ◽  
Further Development ◽  
Beach Volume

The article represents a retrospective review of long time research of genesis and development of the Central beach in the City of Varna which makes possible a forecast of its further development. Both natural and anthropogenic impact on the beach evolution is taken into consideration. It is ascertained that construction of coastal protection structures at the northern part of the beach in 80’s resulted in cessation of natural beach area growth. The strengthen of a breakwater in the main port and illegal building also contributed to considerable coast recession and beach volume reducing. Because of this a recreational potential of the Central beach is gradually decreasing. New method named “cross-shore sediment bypassing” is suggested to reduce the negative trend.

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