scholarly journals EXPERIMENTAL MODELING OF WAVE FORCES AND HYDRODYNAMICS ON ELEVATED COASTAL STRUCTURES SUBJECT TO WAVES, SURGE OR TSUNAMIS: THE EFFECT OF BREAKING, SHIELDING AND DEBRIS

2018 ◽  
pp. 53
Author(s):  
Pedro Lomonaco ◽  
Mohammad Shafiqual Alam ◽  
Pedro Arduino ◽  
Andre Barbosa ◽  
Daniel T. Cox ◽  
...  
Keyword(s):  
Tropical Cyclones ◽  
Tsunami Wave ◽  
Coastal Communities ◽  
Accurate Estimation ◽  
Coastal Protection ◽  
Wave Forces ◽  
Coastal Structures ◽  
Critical Variable ◽  
Large Numbers ◽  
Recreational Services

Coastal communities provide important economic, transport, and recreational services to large numbers of people worldwide. However, these coastal communities are vulnerable to damage by extreme events such as tropical cyclones or tsunamis. Waves and surge, as well as tsunami-wave events, may cause extensive damage to elevated structures through a combination of horizontal and vertical wave and surge-induced forces. Structural elevation has been shown to be a critical variable affecting damage and loss. Recent efforts have been made to retrofit structures or improve coastal protection and damage mitigation plans in coastal communities to increase community resilience. However, to effectively retrofit old structures or design new structures to resist damage due to hurricanes or tsunamis, engineers require an accurate estimation of both the wave hydrodynamics and the resulting loads.

scholarly journals STABILITY ANALYSIS OF RUBBLE-MOUND BREAKWATERS UNDER TSUNAMI FIRST IMPACT AND OVERFLOW

2018 ◽  
pp. 43
Author(s):  
Íñigo Aniel-Quiroga ◽  
César Vidal ◽  
Mauricio González ◽  
Javier L. Lara
Keyword(s):  
Stability Analysis ◽  
Scientific Community ◽  
Tsunami Wave ◽  
Coastal Protection ◽  
Coastal Structures ◽  
Marine Structures ◽  
Physical Experiments ◽  
Rubble Mound ◽  
Rubble Mound Breakwaters ◽  
The Eu

Tsunamis are relatively infrequent but very destructive phenomena that can cause devastating consequences on coastal areas. In view of recent tragic episodes, the scientific community is strengthening their efforts to develop strategies to mitigate the risk of tsunami consequences, specially focused on the potentially affected areas. One of the strategies in this direction is the design and construction of more efficient coastal structures. In this way, in the frame of the EU FP7 project ASTARTE physical experiments on rubble-mound breakwaters (RMB) under tsunami wave attack have been carried out in the IH Cantabria facilities in Santander, Spain. These experiments focused on gaining a better understanding of tsunami impacts on this kind of structures. Improving the knowledge about their stability and hydrodynamics will contribute to a better design of coastal protection marine structures.

scholarly journals Resilience from coastal protection

2015 ◽  
Vol 373 (2053) ◽  
pp. 20140383 ◽  
Author(s):  
Lesley C. Ewing
Keyword(s):  
Cultural Values ◽  
San Francisco ◽  
Coastal Communities ◽  
Coastal Hazards ◽  
Community Safety ◽  
Coastal Protection ◽  
Shore Protection ◽  
Coastal Community ◽  
Effective Community ◽  
Key Aspects

Coastal areas are important residential, commercial and industrial areas; but coastal hazards can pose significant threats to these areas. Shoreline/coastal protection elements, both built structures such as breakwaters, seawalls and revetments, as well as natural features such as beaches, reefs and wetlands, are regular features of a coastal community and are important for community safety and development. These protection structures provide a range of resilience to coastal communities. During and after disasters, they help to minimize damages and support recovery; during non-disaster times, the values from shoreline elements shift from the narrow focus on protection. Most coastal communities have limited land and resources and few can dedicate scarce resources solely for protection. Values from shore protection can and should expand to include environmental, economic and social/cultural values. This paper discusses the key aspects of shoreline protection that influence effective community resilience and protection from disasters. This paper also presents ways that the economic, environmental and social/cultural values of shore protection can be evaluated and quantified. It presents the Coastal Community Hazard Protection Resilience (CCHPR) Index for evaluating the resilience capacity to coastal communities from various protection schemes and demonstrates the use of this Index for an urban beach in San Francisco, CA, USA.

Performance of Light Coastal Structures Under Normal and High Water Conditions

1975 ◽  
Vol 2 (4) ◽  
pp. 381-391 ◽  
Author(s):  
J. W. Kamphuis
Keyword(s):  
Lake Erie ◽  
High Water ◽  
Water Levels ◽  
Coastal Protection ◽  
Coastal Structures ◽  
Water Conditions ◽  
Protection Structures

A number of lightweight coastal protection structures, built on the Lake Erie shore are discussed in this paper. There were two constraints on the design; limited funds and a very precarious downdrift beach. Thus the structures were inexpensive and the protection was low-key to prevent damage downdrift. In 1972–1974 these structures were subjected to a combination of large waves and high water levels and thus they were tested well beyond their design limits.The paper discusses the structures, their performance under normal conditions, and their performance during and after the abnormally high water levels. It is found that inexpensive, low-key structures are sufficiently strong to survive normal conditions, but fail by overtopping and flanking under conditions beyond their low design limits.

Climate Change, Humanitarian Risks, and Social-Political (In)stability Along the Gulf of Aden: Expert Elicitation for the Case of Somalia and Yemen

2021 ◽  
Author(s):  
Laurent Lambert ◽  
Mahmood Almehdhar ◽  
Mustafa Haji
Keyword(s):  
Climate Change ◽  
Tropical Cyclones ◽  
Political Stability ◽  
Coastal Areas ◽  
Expert Elicitation ◽  
Coastal Communities ◽  
Gulf Of Aden ◽  
The World ◽  
Environmental Events

<p><strong>Abstract</strong>: Changes in the global oceanic system have already negatively affected the world’s marine life and the livelihoods of many coastal communities across the world, including in the Middle East' and Eastern Africa's Least Developed Countries (LDCs). Coastal communities in Somalia and Yemen for instance, have been particularly affected by extreme environmental events (EEEs), with an increase in the frequency of tropical cyclones over the past 20 years. Using expert elicitation as a method to generate data to assess and quantify a specific issue in the absence of sufficient and/or reliable data, the authors interviewed selected specialists in or from Somalia and Yemen, from diverse fields of expertise related to climate change, extreme environmental events, disaster risk reduction, and humanitarian affairs. Ten experts followed the elicitation protocol and answered a specific series of questions in order to better quantify the expectable mid-to-long-term climatic and humanitarian levels of risks, impacts, and consequences that climate change and related issues (e.g., sea-level rise, tropical cyclones, and sea surge) may generate in coastal areas along the Gulf of Aden's coastal cities of Aden and Bossaso, in Yemen and Somalia, respectively.</p><p>The findings indicate that there is cause for significant concern as climate change is assessed by all interviewees - irrespective of their background -, as very likely to hold a negative to a devastating impact on (fresh) water security, food security, public health, social conflicts, population displacement, and eventually political stability; and to strongly worsen the humanitarian situations in Somalia and Yemen, both in the medium-term (i.e., 2020-2050) and the long-term (i.e., 2020-2100). The authors call on the scientific community to further research the issue of climate change in the understudied coastal areas of the Gulf of Aden, and on the international community to pro-actively and urgently help the local populations and relevant authorities to rapidly and strongly build up their adaptation capacities, especially in the niche of coastal EEEs.</p>

Distributed Damping of Tsunamis

2015 ◽  
Author(s):  
Mohammadreza Javanmardi ◽  
M. Reza Alam
Keyword(s):  
Shallow Water ◽  
Solitary Waves ◽  
Wave Breaking ◽  
Tsunami Wave ◽  
Coastal Communities ◽  
New Method ◽  
Major Threat ◽  
Tsunami Energy

Tsunamis are a major threat to coastal communities. One of the ways to avoid tsunami disasters is to use breakwaters to attenuate the incident tsunami energy. The incident tsunami energy is expected to be dissipated by induced wave breaking in the shallow water over the structure peak. In this paper, a new method to attenuate the tsunami energy is described and investigated. This new concept dissipates tsunami energy by implementing small barriers into the water before the tsunami reaches the shore. The interaction of tsunami-like solitary waves with new submerged barriers has been investigated and their performance was compared with that of conventional breakwaters. We found that the new structure can be used as a tsunami wave attenuator.

Designing Coastal Structures for Tsunami Loads per ASCE 7-16

2019 ◽  
Author(s):  
Ian N. Robertson ◽  
Jacob McKamey
Keyword(s):  
Puerto Rico ◽  
Pacific Coast ◽  
American Samoa ◽  
Tsunami Hazard ◽  
Economic Consequences ◽  
Coastal Communities ◽  
Risk Category ◽  
Coastal Structures ◽  
High Rise ◽  
The Us

Abstract The 2016 edition of ASCE 7, Minimum Loads and Associated Criteria for Buildings and Other Structures, contains a brand new Chapter 6 on Tsunami Loads and Effects. This new chapter applies to the tsunami design of all Risk Category III (high occupancy) and IV (essential) buildings, and potentially many taller Risk Category II (regular) buildings, in coastal communities in Alaska, Washington, Oregon, California and Hawaii. These provisions can also be applied to other communities exposed to tsunami hazard, including Guam, American Samoa, Puerto Rico, and communities outside the US. This paper shows an example of how the new tsunami design provisions would apply to the design of prototypical multi-story coastal reinforced concrete buildings at different locations on the US Pacific Coast. The prototypical Risk Category II buildings are located in Seaside OR, Monterey CA, Waikiki HI and Hilo HI. Economic consequences of including tsunami design for mid- to high-rise Risk Category II buildings are discussed.

scholarly journals A Waterfront View of Coastal Hazards: Contextualizing Relationships among Geographic Exposure, Shoreline Type, and Hazard Concerns among Coastal Residents

2019 ◽  
Vol 11 (23) ◽  
pp. 6687 ◽  
Author(s):  
Steven B. Scyphers ◽  
Michael W. Beck ◽  
Kelsi L. Furman ◽  
Judy Haner ◽  
Lauren I. Josephs ◽  
...  
Keyword(s):  
Climate Change ◽  
Cost Effectiveness ◽  
Coastal Communities ◽  
Coastal Hazards ◽  
Coastal Protection ◽  
Research And Practice ◽  
Living Shorelines ◽  
Ecological Objectives ◽  
Coastal Residents ◽  
Impacts Of Climate Change

Coastal communities exist on the front lines of diverse natural hazards and the growing impacts of climate change. While traditional strategies for dealing with coastal hazards have often involved the hardening or armoring of shorelines, more recent research and practice have demonstrated the value and cost-effectiveness of “living shorelines” and other ecosystem-based strategies for coastal protection. To explore potential relationships among geographic exposure (waterfront vs. inland), shoreline condition (armored vs. natural), and hazard concerns, we surveyed 583 waterfront and inland residents in the northern Gulf of Mexico. We found that overall concern for coastal hazards was similar across waterfront and inland residents, as well as among residents with both armored and natural shorelines. However, concern for specific hazards differed across these groups. Waterfront residents were significantly more concerned about major hurricanes and erosion than inland residents. Conversely, inland residents were more concerned with drought and flooding than waterfront residents. Among waterfront residents, specific hazard concerns were similar between residents with natural and armored shorelines with two key exceptions. Residents with armored shorelines reported higher concern for erosion and sea level rise than residents with natural shorelines. Our results suggest that armored shorelines do not necessarily alleviate concerns about coastal hazards. In the context of balancing social and ecological objectives in addressing coastal hazards or adapting to climate change, understanding the perceptions and behaviors of coastal residents is essential for conserving and protecting coastal ecosystems along residential shorelines.

scholarly journals Numerical Study on Tsunami Hazard Mitigation Using a Submerged Breakwater

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Taemin Ha ◽  
Jeseon Yoo ◽  
Sejong Han ◽  
Yong-Sik Cho
Keyword(s):  
Wave Reflection ◽  
Surf Zone ◽  
Numerical Study ◽  
Tsunami Hazard ◽  
Coastal Communities ◽  
Coastal Structures ◽  
Accurate Analysis ◽  
Submerged Breakwater ◽  
Eddy Simulation ◽  
Large Eddy

Most coastal structures have been built in surf zones to protect coastal areas. In general, the transformation of waves in the surf zone is quite complicated and numerous hazards to coastal communities may be associated with such phenomena. Therefore, the behavior of waves in the surf zone should be carefully analyzed and predicted. Furthermore, an accurate analysis of deformed waves around coastal structures is directly related to the construction of economically sound and safe coastal structures because wave height plays an important role in determining the weight and shape of a levee body or armoring material. In this study, a numerical model using a large eddy simulation is employed to predict the runup heights of nonlinear waves that passed a submerged structure in the surf zone. Reduced runup heights are also predicted, and their characteristics in terms of wave reflection, transmission, and dissipation coefficients are investigated.

scholarly journals Flooding of Sandy Beaches in a Changing Climate. The Case of the Balearic Islands (NW Mediterranean)

2021 ◽  
Vol 8 ◽  
Author(s):  
Miguel Agulles ◽  
Gabriel Jordà ◽  
Piero Lionello
Keyword(s):  
Sea Level ◽  
Cost Effective ◽  
Wave Climate ◽  
Sandy Beaches ◽  
Balearic Islands ◽  
Accurate Estimation ◽  
Coastal Protection ◽  
Wave Runup ◽  
Sea Levels ◽  
Wide Range

The fate of the beaches around the world has paramount importance as they are one of the main assets for touristic activities and act as a natural barrier for coastal protection in front of marine storms. Climate change could put them at risk as sea levels rise and changes in the wave characteristics may dramatically modify their shape. In this work, a new methodology has been developed to determine the flooding of sandy beaches due to changes in sea level and waves. The methodology allows a cost-effective and yet accurate estimation of the wave runup for a wide range of beach equilibrium profiles and for different seagrass coverage. This, combined with regional projections of sea level and wave evolution, has allowed a quantification of the future total water level and coastline retreat for 869 beaches across the Balearic Islands for the next decades as a function of greenhouse gases emission scenario. The most pessimistic scenario (RCP8.5) at the end of the century yields an averaged percentage of flooded area of 66% under mean conditions which increases up to 86% under extreme conditions. Moreover, 72 of the 869 beaches of the region would permanently disappear while 314 would be completely flooded during storm episodes. Under a moderate scenario of emissions (RCP4.5), 37 beaches would permanently disappear while 254 would disappear only during storm episodes. In both cases, the average permanent loss of beach surface at the end of the century would be larger than 50%, rising over 80% during storm conditions. The results obtained for the Balearic Islands can be extrapolated to the rest of the Mediterranean as the beaches in all the regions have similar characteristics and will be affected by similar changes in sea level and wave climate. These projections indicate that adaptation plans for beach areas should be put in place as soon as possible.

scholarly journals ANALYSIS OF SHORELINE CHANGE IN COASTAL AREA OF SUBANG WEST JAVA INDONESIA FROM 2010 TO 2019 THROUGH SATELLITE IMAGERY

2020 ◽  
Vol 8 (9) ◽  
pp. 1166-1172
Author(s):  
O. Pattipawaej ◽  
◽  
G. Hardiyan ◽  
Keyword(s):  
Negative Impact ◽  
Shoreline Change ◽  
Google Earth ◽  
Coastal Communities ◽  
Coastal Protection ◽  
Damage Analysis ◽  
West Java ◽  
Shoreline Changes ◽  
Coastal Damage ◽  
Satellite Mapping

The condition of beaches in Indonesia is currently quite concerning. Indonesia's mangroves and coastal sand are in danger of being damaged. Commitment from all parties is needed to overcome coastal damage. If not, the negative impact will be dangerous for the existence of coastal communities. Damage to coastal is a serious threat to the surrounding ecosystem, even tends to harm humans. Not only waste carried by the flow into the sea, but also garbage disposed of around the coastal areas of the sea and poor land management are clearly some actions that can reduce the carrying capacity of the environment. This carriage a serious threat to the environment. The beach in Subang district, West Java has quite severe coastal damage. Analysis of shoreline changes is needed to overcome the damage to the coast. The method used to analyze shoreline changes is through satellite mapping using Google Earth. The results obtained from 10 years of coastline satellite mapping in Subang Regency are changes in coastline and area that occur due to erosion and/or accretion. These results will help to challenge erosion and/or accretion. The next step can be made a coastal protection in the form of mangrove plants or coastal protection structures.

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