scholarly journals Assessment of potential beach erosion risk and impact of coastal zone development: a case study on Bongpo–Cheonjin Beach

2021 ◽  
Vol 21 (12) ◽  
pp. 3827-3842
Author(s):  
Changbin Lim ◽  
Tae Kon Kim ◽  
Sahong Lee ◽  
Yoon Jeong Yeon ◽  
Jung Lyul Lee
Keyword(s):  
Survey Data ◽  
Coastal Zone ◽  
Parabolic Type ◽  
Sediment Supply ◽  
Beach Erosion ◽  
Aerial Photographs ◽  
Erosion Risk ◽  
Risk Curve ◽  
Zone Development ◽  
Beach Survey

Abstract. In many parts, coastal erosion is severe due to human-induced coastal zone development and storm impacts, in addition to climate change. In this study, the beach erosion risk was defined, followed by a quantitative assessment of potential beach erosion risk based on three components associated with the watershed, coastal zone development, and episodic storms. On an embayed beach, the background erosion due to development in the watershed affects sediment supply from rivers to the beach, while alongshore redistribution of sediment transport caused by construction of a harbor induces shoreline reshaping, for which the parabolic-type equilibrium bay shape model is adopted. To evaluate beach erosion during storms, the return period (frequency) of a storm occurrence was evaluated from long-term beach survey data conducted four times per year. Beach erosion risk was defined, and assessment was carried out for each component, from which the results were combined to construct a combined potential erosion risk curve to be used in the environmental impact assessment. Finally, the proposed method was applied to Bongpo–Cheonjin Beach in Gangwon-do, South Korea, with the support of a series of aerial photographs taken from 1972 to 2017 and beach survey data obtained from the period commencing in 2010. The satisfactory outcomes derived from this study are expected to benefit eroding beaches elsewhere.

scholarly journals MECHANISM OF OFFSHORE SAND DISCHARGE INTO SUBMARINE CANYON TRIGGERED BY CONSTRUCTING DETACHED BREAKWATER CLOSE TO SHORELINE

2011 ◽  
Vol 1 (32) ◽  
pp. 18
Author(s):  
Koji Yamada ◽  
Takaaki Uda ◽  
Yoshio Suwa ◽  
Toshiro San-nami ◽  
Kou Furuike ◽  
...  
Keyword(s):  
Survey Data ◽  
Submarine Canyon ◽  
Sediment Supply ◽  
Beach Erosion ◽  
Aerial Photographs ◽  
Sand Transport ◽  
Submarine Canyons ◽  
Bathymetric Survey ◽  
Bed Slope

Several submarine canyons have developed offshore of the Aramata region of the Shimoni-ikawa coast in Toyama Bay, which is one of the three deep bays in Japan. The Kurobe River with a steep bed slope flows into the sea immediately north of this region, and a large amount of sediment has been supplied to this area, which has been transported by southward longshore sand transport. However, beach erosion has occurred owing to the decrease in sediment supply from the Kurobe River. Furthermore, since the construction of detached breakwaters as a measure against beach erosion, offshore sand transport has accelerated and beach erosion has become more severe. In this study, aerial photographs and bathymetric survey data were analyzed, then the mechanism of offshore sand transport was investigated using the BG model proposed by Serizawa et al. (2007).

scholarly journals Quantitative interpretation of risk potential of beach erosion due to coastal zone development

2021 ◽  
Author(s):  
Changbin Lim ◽  
Taekon Kim ◽  
Sahong Lee ◽  
Yoon Jeong Yeon ◽  
Jung Lyul Lee
Keyword(s):  
Coastal Zone ◽  
Coastal Erosion ◽  
Beach Erosion ◽  
Aerial Photographs ◽  
Base Line ◽  
Littoral Drift ◽  
Erosion Damage ◽  
Anthropogenic Development ◽  
Zone Development ◽  
Risk Potential

Abstract. Coastal erosion is more severe due to human-induced coastal zone development in addition to natural climate change. Anthropogenic development affecting coastal erosion is divided into three areas; watersheds, coastal waters, and coastal land areas. In this study, the ultimate effect of anthropogenic development on changes in the amount of sand, changes in the littoral drift, and changes in shoreline variability in these three planar areas is expressed as quantitative risk potential of beach erosion damage, defined as a change in the planar surface of the sand beach. The change in the amount of sand is due to the law of conservation of matter, and the littoral drift characteristic of sand is interpreted as a change in the main crest line at the breaking point, and the response characteristics of shoreline position is interpreted as change in the erodibility and recovery characteristics of beach sand. This quantitative method was applied to Bongpo-Cheonjin Beach of erosion grade D (frequency of erosion damage within 5 years) in Gangwon-do, Korea to identify the cause of erosion and evaluate the detailed applicability of this method. It was interpreted using a series of aerial photographs taken from 1972 to 2017 and survey data obtained from the erosion rating project started in 2010. In the erosion rating project, the GPS shoreline survey of 4 times per year and the sand sampling at the swash zones of base line at 150 m intervals are mainly carried out. We showed the feasibility of methodology evaluating the risk potential for beach erosion proposed in this study, and it can be expected that this method will be applicable to eroded beaches elsewhere.

Coastal zone development: Mitigation, marsh creation, and decision-making

1982 ◽  
Vol 6 (4) ◽  
pp. 317-328 ◽  
Author(s):  
Margaret Seluk Race ◽  
Donna R. Christie
Keyword(s):  
Decision Making ◽  
Coastal Zone ◽  
Zone Development ◽  
Marsh Creation

scholarly journals Διαχρονική παρατήρηση των μεταβολών της ακτογραμμής τμήματος της παράκτιας ζώνης του νόμου Πιερίας και εκτίμηση των επιπτώσεων από την μελλοντική άνοδο της θαλάσσιας στάθμης

2005 ◽  
Vol 38 ◽  
pp. 182
Author(s):  
Κ. ΤΣΑΝΑΚΑΣ ◽  
Ε. ΚΑΡΥΜΠΑΛΗΣ ◽  
Ι. ΠΑΡΧΑΡΙΔΗΣ
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Coastal Zone ◽  
Global Climate ◽  
Aerial Photographs ◽  
Qualitative Assessment ◽  
Gis And Remote Sensing ◽  
Socioeconomic Environment ◽  
Area North ◽  
Remote Sensing Techniques

The aim of this study is to detect shoreline changes along part of the coastal zone of Piena during the time period between 1969 and 2000 using aerial photographs and satellite images. Additionally, a quantitative and qualitative assessment of the future sea-level rise (triggered by the global climate change) implications to the physical and socioeconomic environment of the area is attempted taking into account various sea-level rise scenarios. Retreating as well as prograding regions along the study area were defined and retreating/prograding rates for the time periods 1969-1987 and 1987-2000 were estimated using GIS and Remote Sensing techniques. Building activity rates for the coastal area of Paralia Katerinis were also estimated for the same periods. The coastline of the study area is retreating^ except than the area north of torrent Mavroneri where a progradation rate of 48 cm/year was estimated between 1969 and 1987. Retreating rate of the coast for the northern part of the area (Saltworks) is estimated to be 25 cm/year and 19 cm/yrear for the periods of 1969-1987 and 1987-2000 respectively. The broader study area is particularly vulnerable to a potential future sealevel rise due to the low-lying topography of the coastal zone and intensive socioeconomic activities such as tourism and commerce.

scholarly journals BACTON SANDSCAPING - BUILDING WITH NATURE TO SAFEGUARD THE UK'S GAS SUPPLY AND HELP COMMUNITIES ADAPT TO COASTAL CHANGE

2020 ◽  
pp. 15
Author(s):  
Jaap Flikweert ◽  
Christine Adnitt
Keyword(s):  
Large Scale ◽  
Beach Nourishment ◽  
Beach Erosion ◽  
Coastal Change ◽  
Erosion Risk ◽  
Natural Processes ◽  
Building With Nature ◽  
The Uk ◽  
Gas Supply

The Bacton Sandscaping scheme is a large-scale beach nourishment, designed to protect the Bacton Gas Terminal from cliff and beach erosion while also reducing flood and erosion risk to the communities of Bacton and Walcott, buying the time they need for adaptation to coastal change. The scheme was inspired by the even larger Dutch Zandmotor project, translating the concept to the different geography and governance setting of the UK - it can be seen as the Zandmotor's 'little nephew'. The term 'Sandscaping' was introduced to illustrate the large-scale and ambitious nature of the concept: work at a large scale, designing to work with natural processes and to achieve multiple objectives.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/FA3DjdCgKrk

scholarly journals Dynamics of Farming Systems under the Context of Coastal Zone Development: The Case of Xuan Thuy National Park, Vietnam

Agriculture ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 138 ◽  
Author(s):  
Thi Trang Nhung NGUYEN ◽  
Huu Cuong TRAN ◽  
Thi Minh Hop HO ◽  
Philippe BURNY ◽  
Philippe LEBAILLY
Keyword(s):  
Coastal Zone ◽  
National Park ◽  
Production Efficiency ◽  
Family Income ◽  
Farming Systems ◽  
Coastal Development ◽  
Variable Cost ◽  
Integrated Aquaculture ◽  
Rural Livelihood ◽  
Zone Development

The study was conducted in Xuan Thuy National Park to provide a comparative assessment of different farming systems under the context of the coastal zone development of Vietnam. Based on a sample of 234 farmers in this area, SCP (Structure–Conduct–Performance) analysis revealed three farming systems: integrated aquaculture–mangrove (IAM), intensive shrimp (ISH), and rice-based (RB) farming. The evaluation of farm performance among the systems indicated that ISH incurred the highest values of variable cost and sustainable family income. Meanwhile, IAM obtained the lowest production cost due to the availability of allocated natural resources. The imbalance of applying synthesized fertilizers and an overdependence on nitro-based fertilizers were reported in the case of RB systems. In comparison with the other coastal areas of Vietnam, these farming systems achieved a lower level of production efficiency. It is urgent for policy makers to take action to promote sustainable farming practices in accordance with the stringent enforcement of environmental standards to reduce potential impacts and strengthen the coexistence of systems. Additionally, the purpose of securing rural livelihood under coastal development is aligned with the recommended solutions for economic improvement in this study.

Soft rock cliff retreat under changing climate drivers

2020 ◽  
Author(s):  
Thomas Spencer ◽  
Susan Brooks
Keyword(s):  
North Sea ◽  
Regional Scale ◽  
Soft Rock ◽  
Water Levels ◽  
Sediment Supply ◽  
Aerial Photographs ◽  
Observation Data ◽  
Short Term ◽  
Sediment Release ◽  
Cliff Retreat

<p>Shoreline retreat can happen rapidly in cliffs composed of loosely consolidated glacial and pre-glacial sediments. Typical centennial-scale average retreat rates for some cliffed coastlines of East Anglia, UK are 2 - 5 m a<sup>-1</sup> where cliffs have no protection from storm energetics. Recent research using pre- and post-storm clifftop (geomorphological) surveys, as well as aerial photographs, has shown that in single events retreat can be 3 – 4 times the long-term average, with up to 15 m of retreat in a single event. Periods of clifftop stasis are thus interspersed with short term shocks, when meteorological conditions generate energetic drivers of change (elevated still water levels, high onshore waves, high rainfall inputs). Furthermore, short term shocks deliver enhanced sediment supply to the nearshore region, which is an important factor to take into account within future management planning strategies.  </p><p>This paper uses the latest Earth Observation data to quantify and evaluate rates of soft rock cliff retreat, thereby identifying periods when short term shocks have been delivered to the cliffs. It then explores the climate drivers of these shocks and assesses the associated synoptic meteorological scenarios. Finally it considers the implications for quantities of sediment released, in terms of both overall magnitude and alongshore variability.</p><p>Results suggest that three recent events stand out as having a significant impact on rates of cliff retreat and associated sediment release on the Suffolk coast, southern North Sea. The “Big Freeze” of the UK winter of 2010-11 involved a protracted period of easterly air flow from mid-November and into December, 2010. The process drivers were high magnitude onshore winds, generating nearshore waves of around 4 m. The 5 December 2013 North Sea surge similarly resulted in rapid cliff retreat and sediment release. In this event winds were alongshore so the wave impacts were lower, but the elevated water levels generated by the surge meant that wave action could be directed onto the cliffs. By far the biggest recent event in terms of storm forcing energetics was the February – March 2018 “Beast from the East” and “Mini Beast”, where persistent onshore winds generated waves of almost 4.5 m at Southwold Approaches (highest on record) that coincided with two phases of high spring tides (no surge). When regional-scale Sudden Stratospheric Warming (SSW) generates strong and persistent easterly winds there are widespread potentially irreversible consequences for cliff and beach sediments around the western North Sea coastline.</p>

scholarly journals The Analysis of Beach Survey Data and Prediction on The Movement of Shore Line

1997 ◽  
Vol 13 ◽  
pp. 675-680
Author(s):  
Kouhei Takahasi ◽  
You Sakamoto ◽  
Shoichi Abe
Keyword(s):  
Survey Data ◽  
Shore Line ◽  
Beach Survey
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