Preprints
https://doi.org/10.5194/nhess-2022-253
https://doi.org/10.5194/nhess-2022-253
 
09 Nov 2022
09 Nov 2022
Status: this preprint is currently under review for the journal NHESS.

Assessing Typhoon Soulik-induced morphodynamics over the Mokpo coast region in South Korea based on a geo-spatial approach

Sang-Guk Yum1, Moon-Soo Song2, and Manik Das Adhikari3 Sang-Guk Yum et al.
  • 1Department of Civil Engineering, Gangneung-Wonju National University, Gangneung, Gangwon do 25457, South Korea
  • 2Interdisciplinary Program in Crisis, Disaster and Risk Management, Sungkyunkwan University, Suwon, Gyeonggi-do 2066, South Korea
  • 3Department of Civil Engineering, Gangneung-Wonju National University, Gangneung, Gangwon do 25457, South Korea

Abstract. The inner shelf and coastal region of the Yellow Sea along the Korean peninsula are frequently impacted by Typhoons. The Mokpo coastal region in South Korea has been significantly affected by typhoon Soulik in 2018, the deadliest typhoon strike to the southwestern coast, since Maemi in 2003. Typhoon Soulik overran the region, causing extensive damage to the coast, shoreline, vegetation, and coastal geomorphology. Therefore, it is important to investigate its impact on the coastal ecology, landform, erosion/accretion, suspended sediment concentration (SSC) and associated coastal changes along the Mokpo region.

In this study, net shoreline movement (NSM), Normalized Difference Vegetation Index (NDVI)), coastal landform change model, Normalized Difference Suspended Sediment Index (NDSSI), and SSC-reflectance relation have been used to analyze the coastal morphodynamics over the typhoon periods. We used pre- and post-typhoon Sentinel-2B MSI images for mapping and monitoring the typhoon effect. The findings highlighted the significant impacts of typhoons on coastal dynamics, wetland vegetation and sediment resuspension along the Mokpo coast. It has been observed that typhoon-induced SSC influences shoreline and coastal morphology. The outcome of this research may provide databases to manage coastal environments and a long-term plan to restore valuable coastal habitats. In addition, the findings may be useful for post-typhoon emergency response, coastal planners, and administrators involved in the long-term development of human life.

Sang-Guk Yum et al.

Status: open (until 21 Dec 2022)

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  • RC1: 'Comment on nhess-2022-253', Anonymous Referee #1, 15 Nov 2022 reply

Sang-Guk Yum et al.

Sang-Guk Yum et al.

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Short summary
1. Study performed analysis on typhoon-induced Coastal morphodynamics for Mokpo coast. 2. Wetland vegetation was severely impacted by typhoon Soulik. 3. 87.35 % of shoreline transects experienced seaward migration. 4. The result highlighted that sediment resuspension controls the land alteration process over the typhoon period. 5. The land accretion process was dominated during the pre- to post-typhoon period.
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