scholarly journals Impact Assessment of Beach Erosion from Construction of Artificial Coastal Structures Using Parabolic Bay Shape Equation

2020 ◽  
Vol 34 (6) ◽  
pp. 436-441
Author(s):  
Changbin Lim ◽  
Sahong Lee ◽  
Seung-Min Park ◽  
Jung Lyul Lee
Keyword(s):  
Impact Assessment ◽  
Beach Erosion ◽  
Coastal Structures ◽  
Shape Equation

scholarly journals Simulation of Bay-Shaped Shorelines after the Construction of Large-Scale Structures by Using a Parabolic Bay Shape Equation

2021 ◽  
Vol 9 (1) ◽  
pp. 43
Author(s):  
Changbin Lim ◽  
Jooyong Lee ◽  
Jung Lyul Lee
Keyword(s):  
Shoreline Change ◽  
Beach Erosion ◽  
Eastern Coast ◽  
Development Projects ◽  
Change Model ◽  
Change Models ◽  
Shoreline Changes ◽  
Beach Slope ◽  
Shape Equation ◽  
Genesis Model

Among the various causes of coastal erosion, the installation of offshore breakwaters is considered the main cause that influences the most serious changes in shorelines. However, without a proper means for predicting such terrain changes, countries and regions continue to suffer from the aftermath of development projects on coastal land. It has been confirmed that the parabolic bay shape equation (PBSE) can accurately predict shoreline changes under the wave climate diffracted as a result of such development projects. This study developed a shoreline change model that has enhanced the previous shoreline change models by applying PBSE to shoreline changes into bay-shaped features. As an analytical comparison with the second term of the GENESIS model, which is an existing and well-known shoreline change model, a similar beach erosion width was obtained for a small beach slope. However, as the beach slope became larger, the result became smaller than that of the GENESIS model. The validity of the model was verified by applying it to satellite images that demonstrated the occurrence of shoreline changes caused by breakwaters for seaports on the eastern coast of Korea; Wonpyeong beach, Yeongrang beach, and Wolcheon beach. As a result, each studied site converged on the static equilibrium planform within several years. Simultaneously, the model enabled the coastal management of the arrangement of seaports to evaluate how the construction of structures causes serious shoreline changes by creating changes to wavefields.

LAYOUT DESIGN OF COASTAL STRUCTURES FOR MITIGATING BEACH EROSION

2019 ◽  
Author(s):  
JUNG L. LEE ◽  
SAHONG LEE ◽  
TAE-KON KIM ◽  
WON CHUL CHO
Keyword(s):  
Layout Design ◽  
Beach Erosion ◽  
Coastal Structures

scholarly journals ANALYSIS OF BEACH EROSION AROUND LARGE-SCALE COASTAL STRUCTURES

1986 ◽  
Vol 1 (20) ◽  
pp. 171 ◽  
Author(s):  
T. Uda ◽  
M. Sumiya ◽  
Y. Kobayashi
Keyword(s):  
Large Scale ◽  
Beach Erosion ◽  
Aerial Photographs ◽  
Coastal Structures ◽  
Large Scale Structures ◽  
Spatial Changes ◽  
The Pacific ◽  
Median Diameter ◽  
The Pacific Ocean ◽  
Ibaraki Prefecture

The coast of Ibaraki Prefecture, facing the Pacific Ocean, has an alongshore stretch of 181 km. On this coast many structures associated with harbors have been constructed since early 1960s. Since then 25 years have passed, and some notable beach changes due to the influence of the construction of the coastal structures have been observed. This study aims to examine the actual situation of the beach change around large-scale structures and the damages of the coastal structures selecting the coast of Ibaraki Prefecture as the study area. For the purpose aerial photographs were taken along the coast, and the topographic surveys and measurements of median diameter of beach-face materials were made. Data of the soundings having been conducted once a year since 1975 around Oharai Port and Hazaki Fishery Harbor were collected in order to study the beach changes around the large-scale coastal structures. For the analysis of these data the comparison of the shoreline changes were performed by using four sets of aerial photographs since 1947 to the present. Moreover, temporal and spatial changes of the beach topography were investigated by the sounding data.

scholarly journals CHRONIC BEACH EROSION INDUCED BY COASTAL STRUCTURES IN CHELEM, YUCATÁN

2012 ◽  
Vol 1 (33) ◽  
pp. 125 ◽  
Author(s):  
María Alejandra Lira-Pantoja ◽  
Alec Torres-Freyermuth ◽  
Christian Mario Appendini ◽  
Diana Carolina Fernández ◽  
Paulo Salles ◽  
...  
Keyword(s):  
Sediment Transport ◽  
Numerical Model ◽  
Water Depth ◽  
Beach Erosion ◽  
Wave Transformation ◽  
Coastal Structures ◽  
Erosion Rates ◽  
Wave Conditions ◽  
Alongshore Sediment Transport ◽  
The Waves

The Yucatan coastline has been experiencing beach erosion during the past few decades; the erosion has reached critical points at some locations such as the Chelem beach, located near the Progreso Pier. Despite this problem, only few studies have been devoted in order to investigate the role of coastal structures on explaining the high erosion rates reported at this location. Therefore, the aim of this work is to evaluate the effects of the Progreso Pier on the wave transformation and alongshore sediment transport in the study area. Field surveys were conducted in a monthly basis in order to estimate the erosion rates and wave conditions with an ADCP installed at 8 m water depth. The field information confirmed the high erosional trends (O(1)m/year) that explain coastal infrastructure damage and property losses. The wave measurements were employed as the forcing of a wind-wave numerical model (MIKE 21 SW). The numerical model is implemented in the study area for two different scenarios, with and without the pier; this was to estimate nearshore wave conditions. Subsequently, the nearshore wave climate at 5 m water depth is employed for the calculation of alongshore sediment transport rates in 5 points that are representative of the littoral drift along the study area. The modeling results show that the pier acts as a large scale wave-sheltering structure that induces important alongshore sediment transport gradients under mean wave conditions, decreasing the capacity of the waves to recover the beach. On the other hand, during winter storms, when the direction of the waves is from the NNW, the structure does not seem to play an important role on wave transformation into the study. As a result, the Progreso Pier enhances beach erosion in the Chelem area by inducing algonshore gradients in sediment transport and decreasing the beach recovery capability

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