Morphological recovery of beach severely damaged by the 2011 great east Japan tsunami

Hoang, Vo Cong; Tanaka, Hitoshi; Mitobe, Yuta

doi:10.1016/j.ecss.2019.106274

Cited by 5 publications

(7 citation statements)

References 26 publications

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“…The rapid recovery of the beach north of Meulaboh documented here is consistent with observations of post tsunami beach recovery after the 2011 Tohoku Tsunami in Japan [8] and at Lampu Uk, the bay immediately north to Leupung 60% of the sediment lost due to the tsunami was regained within 6 months [16]. This rapid beach recovery has also been seen in Thailand after the 2004 IOT [3,7,11].…”

Section: Discussionsupporting

confidence: 88%

After the Indian Ocean Tsunami (IOT): Natural beach recovery, Meulaboh, Sumatra, Indonesia

2022

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Ground-penetrating radar (GPR) offers an efficient and non-invasive method of identifying and characterising subsurface features. It has previously been used to investigate both tsunami deposits and marine erosion surfaces from tsunamis as well as the structure of the structure of prograding beaches. The present study investigates beach deposits at Meulaboh, western coast of Aceh Province in Sumatra Island of Indonesia, to estimate the volume of sediment that has been deposited since the 2004 Indian Ocean Tsunami, using the GPR with an antenna of 200 MHz. Two profiles perpendicular to the coastline were collected, one 93 m long and the other 30 m long, to capture the internal profile of beach ridge deposition. From the GPR measurement the amount of 1,190,191,716 tons of sediment redeposited along the 1092 m coastline since the 2004 tsunami, with a prograding length of 73 m per year. As beaches provide a good form of tsunami protection the rapid beach recovery and the return of a large amount of sediment helps provide much needed coastal protection to the area.

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Section: Discussionsupporting

confidence: 88%

After the Indian Ocean Tsunami (IOT): Natural beach recovery, Meulaboh, Sumatra, Indonesia

2022

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“…A very high correlation (squared correlation coefficient, R 2 = 0.84) between the amount of sudden retreat and subsidence was observed, as shown in Figure 7a. Based on the estimation, the retreats were reducing from north to south (from #1 to #8, the Figure 7), which may be dependent on cross-shore sediment transport generated by sudden subsidence, or relative sea level rise, as reported in Hoang et al, (2019) [12]. A regular survey on shoreline position at the Hasaki Research Pier (HORS), located approximately 100 km south of Ibaraki, reports that the coast did not experience an obvious retreat, while subsidence caused by the earthquake was approximately 0.2 m [13].…”

Section: Shoreline Change: Retreat Due To Subsidence and Tsunamimentioning

confidence: 61%

“…Attempting to help the recovery of the coast and reduce the effects of a future tsunami to the hinterland, local governments along the Honshu Island have proposed an earthquake disaster reconstruction plan [12]. For example, the repair of coastal structures (2016-2019), as seen at the Ariake, can be an important factor for shoreline advancement (see Figure 6c).…”

Section: Shoreline Change: Remaining Issuesmentioning

confidence: 99%

Shoreline Changes along Northern Ibaraki Coast after the Great East Japan Earthquake of 2011

Quang

Takewaka

2021

Remote Sensing

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In this study, we analyze the influence of the Great East Japan Earthquake, which occurred on 11 March 2011, on the shoreline of the northern Ibaraki Coast. After the earthquake, the area experienced subsidence of approximately 0.4 m. Shoreline changes at eight sandy beaches along the coast are estimated using various satellite images, including the ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer), ALOS AVNIR-2 (Advanced Land Observing Satellite, Advanced Visible and Near-infrared Radiometer type 2), and Sentinel-2 (a multispectral sensor). Before the earthquake (for the period March 2001–January 2011), even though fluctuations in the shoreline position were observed, shorelines were quite stable, with the averaged change rates in the range of ±1.5 m/year. The shoreline suddenly retreated due to the earthquake by 20–40 m. Generally, the amount of retreat shows a strong correlation with the amount of land subsidence caused by the earthquake, and a moderate correlation with tsunami run-up height. The ground started to uplift gradually after the sudden subsidence, and shoreline positions advanced accordingly. The recovery speed of the beaches varied from +2.6 m/year to +6.6 m/year, depending on the beach conditions.

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“…The dominant wave directions indicate that before any anthropogenic processes, the main direction of the alongshore drift on the Sendai Coast is from the south to the north starting from the Abukuma River mouth to the end of the littoral drift at the Sendai Port. According to the field measurement of accumulative sediment from Sawamoto [19], after the construction of the Yuriage Port, the sediment bypassing rate from the updrift through the port to the northern coast is equal to zero. Further investigations conducted by Widyaningtia et al [25] provided the depth of closure (DoC) value in the port to be from 12 to 14 m, which is much bigger than the average DoC of 8 m on the Sendai Coast [26].…”

Section: Field Sitementioning

confidence: 99%

“…Monecke et al [11] simulated the cross-shore profile change under the prevailing hydrodynamic conditions to investigate the recovery process, while Martínez et al [12] applied a more complicated sediment transport model (Delft3D) in conjunction with morphology and topography data analysis to discuss the erosive behavior of the microtidal Tubul-Raqui wetland in south-central Chile. In Japan, more thorough and multidisciplinary research of the coastal and riverine damage and recovery after the tsunami was conducted using the sufficient availability of both pre-and post-tsunami data [13][14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Morphology Recovery and Convergence of Topographic Evolution in the Natori River Mouth after the 2011 Tohoku Tsunami

Hiep¹,

Tanaka²,

Tinh³

2022

Water

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The 2011 Great East Japan earthquake and tsunami caused significant damage along the coastal region in Miyagi Prefecture. In the Natori River of Miyagi Prefecture, the recovery process of the estuarine morphology has been observed since the tsunami arrived. In this study, detailed analyses of collected aerial photographs and beach topography in front of the river mouth were conducted to evaluate whether the river mouth has reached a new equilibrium. The shoreline analysis suggests that the river mouth has obtained an equilibrium state after 2014 in which the sediment volume can be preserved within the littoral system. In addition, the convergence process to the stable topography was detected by the first spatial and temporal eigenfunctions obtained from the empirical orthogonal function (EOF) analysis of the beach profiles. From the results, it can be concluded that the river mouth has obtained a new equilibrium of morphology after the tsunami. As the recurrence of the tsunami can be expected in the next several centuries, the findings of this study can be useful for long-term coastal and riverine management against future disasters in this river mouth, and other coastal regions that are prone to large-scale disasters in the near future.

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Morphological recovery of beach severely damaged by the 2011 great east Japan tsunami

Cited by 5 publications

References 26 publications

After the Indian Ocean Tsunami (IOT): Natural beach recovery, Meulaboh, Sumatra, Indonesia

After the Indian Ocean Tsunami (IOT): Natural beach recovery, Meulaboh, Sumatra, Indonesia

Shoreline Changes along Northern Ibaraki Coast after the Great East Japan Earthquake of 2011

Morphology Recovery and Convergence of Topographic Evolution in the Natori River Mouth after the 2011 Tohoku Tsunami

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