scholarly journals Assessment of Coastal Protection Based on Risk Maps: A Case Study on Yunlin Coast, Taiwan

2018 ◽  
Author(s):  
Wei-Po Huang ◽  
Jui-Chan Hsu ◽  
Chun-Shen Chen ◽  
Chun-Jhen Ye
Keyword(s):  
Land Use ◽  
Coastal Region ◽  
Design Criteria ◽  
Coastal Protection ◽  
Coastal Zones ◽  
Protection Measures ◽  
Coastal Defense ◽  
Protection Area ◽  
Risk Maps

In this study, we used the natural and anthropogenic characteristics of a coastal region to generate risk maps showing vulnerability and potential hazards, and proposed design criteria for coastal defense and land use for the various kinds of risks faced. The Yunlin coast: a first-level protection area in mid-west Taiwan, was then used as an example to illustrate the proposed design criteria. The safety of the present coastal defenses and land use of the Yunlin coastal area was assessed, and coastal protection measures for hazard prevention were proposed based on the generated risk map. The results can be informative for future coastal management and the promotion of sustainable development of coastal zones.

scholarly journals The Study of the Coastal Management Criteria Based on Risk Assessmeant: A Case Study on Yunlin Coast, Taiwan

Water ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 988 ◽  
Author(s):  
Wei-Po Huang ◽  
Jui-Chan Hsu ◽  
Chun-Shen Chen ◽  
Chun-Jhen Ye
Keyword(s):  
Land Use ◽  
Coastal Management ◽  
Coastal Region ◽  
Design Criteria ◽  
Coastal Protection ◽  
Coastal Zones ◽  
Protection Measures ◽  
Coastal Defense ◽  
Protection Area

In this study, we used the natural and anthropogenic characteristics of a coastal region to generate risk maps showing vulnerability and potential hazards, and proposed design criteria for coastal defense and land use for the various kinds of risks faced. The Yunlin coast, a first-level protection area in mid-west Taiwan, was then used as an example to illustrate the proposed design criteria. The safety of the present coastal defenses and land use of the Yunlin coastal area was assessed, and coastal protection measures for hazard prevention were proposed based on the generated risk map. The results can be informative for future coastal management and the promotion of sustainable development of coastal zones.

Coastal protection measures, case study (Mediterranean zone, Egypt)

2015 ◽  
Vol 19 (3) ◽  
pp. 281-294 ◽  
Author(s):  
Ali Masria ◽  
Moheb Iskander ◽  
Abdelazim Negm
Keyword(s):  
Coastal Protection ◽  
Protection Measures

scholarly journals Impacto Econômico da erosão na praia do Hermenegildo (RS), Brasil.

2001 ◽  
Vol 28 (2) ◽  
pp. 393 ◽  
Author(s):  
LUCIANA SLOMP ESTEVES ◽  
ISAAC RODRIGUES DOS SANTOS
Keyword(s):  
Property Values ◽  
Local Economy ◽  
Beach Erosion ◽  
Coastal Protection ◽  
Protection Measures ◽  
The Real Estate ◽  
Best Management ◽  
Coastal Defense ◽  
Property Owners ◽  
Real Estate Sales

Although there is still a discussion about the extent of erosion along the Rio Grande do Sul shoreline, some places are recognized as intensely eroded, such as Jardim do Éden beach, Conceição Lighthouse, and Hermenegildo. This study evaluates the economic impacts of erosion in Hermenegildo based on the costs of coastal protection, destruction of structures during storms, and depreciation of beachfront property values. The study area consists in the 2-km long urbanized shore of Hermenegildo, a beach village located in the southernmost littoral of Brazil, 12 km north of the Uruguayan border. Erosion has threatened beachfront development during storms, resulting in a heavily armored shoreline. Quarrystone revetments (rip rap) and/or seawalls are the most common structures. A strong storm struck this coast in 16 April 1999 destructing 22 houses, all concrete structures, half of the quarrystone revetments, and 80% of the timber seawalls. After that storm, similar structures were built to protect beachfront properties. According to interviews conducted with property owners, average protection costs were estimated in U$ 2,203/property or U$79,308/km. Extrapolating the average costs for the 72 protected properties, total expenses in coastal defense is estimated in U$ 158,616. Considering a storm with same intensity and destruction power reaching the coast of Hermenegildo, the expected damage in land loss, destruction of houses and structures would be in the order of U$ 394,000. Analysis of the real estate sales in the last three years indicates a depreciation of 50-80% in beachfront property values while properties located further inland had a depreciation of 10%. Beach erosion has impacted the local economy and will continue to do so until the problem is effectively addressed. As the values at risk in Hermenegildo are relatively lower than usual coastal protection measures, probably relocation of structures or alternative techniques might be the best management option.

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 Impact of coastal protection systems on marine ecosystems

2019 ◽  
Vol 85 ◽  
pp. 07011 ◽  
Author(s):  
Iulia Alina Anton ◽  
Mariana Panaitescu ◽  
Fanel-Viorel Panaitescu ◽  
Simona Ghiţă
Keyword(s):  
Beach Nourishment ◽  
Ecological Impacts ◽  
Coastal Protection ◽  
Marine Animals ◽  
Protection Measures ◽  
Coastal Defense ◽  
Protected Natural Areas ◽  
Sand Nourishment ◽  
Fixed Structure ◽  
Protection Structures

Various solutions, which consist of numerous techniques, technologies and planning measures, are testing for reduction shoreline erosion, precisely for protection shore against waves attack. These methods may affect the site's geology and geomorphology, involving changes of the habitats in the site. Coastal defense projects and ideas must take into account the structure and functions of protected natural areas and their conservation objectives in order to avoid threatening the species and/or habitats on the site. The ecological impacts expected from coast protection structures on short-term are mostly negative, may disturbance the birds from their habitat, and destruct the marine coastal habitats with their own flora and fauna. In this study, we are indicating the effects of coastal protection measures on the ecosystem. Therefore, we present a part of methods applied or which will be apply on the Romanian shoreline and the effects that have an impact on the species and/or habitats on the site. The methods referred to “hard” methods so to harder the shore with fixed structure (bulkhead, seawall, revetment, breakwaters, sills or groins) or “soft” methods like beach nourishment that is not a sustainable method in time. The protection structures like breakwaters and groins trap or add sand and will change the beach geometry this means that can introduce new artificial material, which is extensively and rapidly colonized by algae and marine animals. In the cases of beach nourishment, under water sand nourishment and mudflat recharge, there are impacts both at the borrow site (the sediment source) and the target site. In the zone of extraction of borrow, sediments appear a damage and mortality to the benthos. Finally, it can conclude that some of the effects are beneficial for socio-economic aspect, but it is important also, the environment, which can bring bad consequences for earth landscape and make the ecosystem, be unbalanced.

scholarly journals A RISK-INFORMED APPROACH TO COASTAL ZONE MANAGEMENT

2011 ◽  
Vol 1 (32) ◽  
pp. 8 ◽  
Author(s):  
Ruben Jongejan ◽  
Roshanka Ranasinghe ◽  
Han Vrijling
Keyword(s):  
Climate Change ◽  
Land Use ◽  
Coastal Zone ◽  
Land Use Planning ◽  
Value At Risk ◽  
Exceedance Probability ◽  
Coastal Protection ◽  
Coastal Zones ◽  
Economic Perspective ◽  
Buffer Zones

Economic and population growth have led to an unprecedented increase in the value at risk in coastal zones over the last century. To avoid excessive future losses, particularly in the light of projected climate change impacts, coastal zone managers have various instruments at their disposal. These primarily concern land-use planning (establishing buffer zones) and engineering solutions (beach nourishment and coastal protection). In this paper, we focus on risk mitigation through the implementation of buffer zones (setback lines). Foregoing land-use opportunities in coastal regions and protecting coasts is costly, but so is damage caused by inundation and storm erosion. Defining appropriate setback lines for land-use planning purposes is a balancing act. It is however unclear what level of protection is facilitated by current approaches for defining setback lines, and whether this is, at least from an economic perspective, sufficient. In this paper, we present an economic model to determine which setback lines would be optimal from an economic perspective. The results provide a useful reference point in the political debate about the acceptability of risk in coastal zones. The main conclusions are (i) that it is useful to define setback lines on the basis of their exceedance probabilities, (ii) that the exceedance probability of an economically efficient setback line will typically be in the order of magnitude of 1/100 per year, (iii) that it is important to distinguish between situations in which morphological conditions are stationary and non-stationary, and (iv) that long-term uncertainties (e.g. due to climate change) influence the exceedance probability of efficient setback lines but only to a limited extent.

scholarly journals Bathymetry mapping using VNREDSAT-1 image: A case study in Ninh Hai coast, Ninh Thuan province of Vietnam

2019 ◽  
Vol 19 (4A) ◽  
pp. 67-77
Author(s):  
La Van Khin ◽  
Tong Phuoc Hoang Son ◽  
Nguyen Huu Huan ◽  
Pham Ba Trung
Keyword(s):  
Water Depth ◽  
Atmospheric Correction ◽  
Coastal Region ◽  
Correlation Coefficients ◽  
Coastal Zones ◽  
Scientific Application ◽  
Regression Methods ◽  
Minimum Requirements ◽  
Remote Sensing Techniques

Bathymetry mapping of coastal zones is one of the minimum requirements to serve related activities as marine management, transportation, construction and scientific application. However, the traditional method of direct measurement in the fields meets problems of time consuming, manpower and money. Applying remote sensing techniques to establish bathymetry in shallow water is an effective method to overcome the traditional problems. The objective of this study is to use VNREDSAT-1 data to map the bathymetry in a coastal region of Vietnam and Ninh Hai coast was selected as a case study in this research. The image was acquired on September 4th, 2013 and preprocessed through atmospheric correction using 6S model and sun glint removal by Hedley method. A total of 3,642 collected data points were divided into two parts, the first part of 2,810 points used to build up the model and the rest of 832 points for validation. The model used is based on multiple regression methods with four independent variables as four bands and a dependent variable as water depth. The results show that the models got high accuracy at the water depth from 10 m to 19 m with root mean square error of 1.03 m to 1.99 m and correlation coefficients of 0.72 to 0.74. This study demonstrates the capacity of VNREDSAT-1 in bathymetry mapping, and it would be an efficient tool for precisely mapping crude bathymetry in Vietnam.

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