TY - JOUR

T1 - Assessment of shoreline changes for setback zone establishment from Son Tra (Da Nang city) to Cua Dai (Hoi An city), Vietnam

AU - Van Liem, Ngo

AU - Van Bao, Dang

AU - Bac, Dang Kinh

AU - Cuong, Ngo Chi

AU - Nga, Pham Thi Phuong

AU - Burkhard, Benjamin

AU - Chi, Giap Thi Kim

N1 - Funding Information: This study was supported by a national scientific and technological project, No. KC.09.17/16-20 funded by the Ministry of Science and Technology in Vietnam. We are thankful to the VNU University of Science, Hanoi for providing all the facilities for this research. We are grateful for the time and efforts of the editors and the anonymous reviewers on improving our manuscript.

PY - 2020/9/14

Y1 - 2020/9/14

N2 - The most important function of the coastal setback is to minimize damage due to coastal erosion, climate change response, and sea-level rise. There are many directions and methods of researching and assessing coastal changes and coastal erosion. This study presents the results of the shoreline changes in the area from Son Tra (Da Nang City) to Cua Dai (Hoi An City), Central Vietnam based on remote sensing data from 1965 to 2019. Three methods are used to include End Point Ratio (EPR), Linear Regression Rate (LRR), and Weighted Linear Regression (WLR). The results show that the EPR method is effective when calculating the rate of shoreline changes only at two different times. For more objective and reliable calculation, it is necessary to assess the shoreline changes over time. Meanwhile, the LRR method was shown to be superior because all shoreline data were taken into account during the construction of the regression line. However, when there is much shoreline data with different reliability, the WLR method proved more superior because of limited objective errors. The results show that from 1965 to 2019, the coast of the Son Tra - Cua Dai area had quite complicated fluctuations, of which the northern area (Son Tra) tended to accretion, the central area tends to be alternate between accretion and erosion, while the south area (Cua Dai) is strong to very strong erosion. The coast with sudden changes is the Cua Dai area with the shoreline change envelope (SCE) reaching 512 m. The results also allow us to divide the coast of the Son Tra - Cua Dai area into 30 segments. They are clustered into 8 groups with different levels of erosion and accretion. This is an important basis for the setback zone establishment in the study area.

AB - The most important function of the coastal setback is to minimize damage due to coastal erosion, climate change response, and sea-level rise. There are many directions and methods of researching and assessing coastal changes and coastal erosion. This study presents the results of the shoreline changes in the area from Son Tra (Da Nang City) to Cua Dai (Hoi An City), Central Vietnam based on remote sensing data from 1965 to 2019. Three methods are used to include End Point Ratio (EPR), Linear Regression Rate (LRR), and Weighted Linear Regression (WLR). The results show that the EPR method is effective when calculating the rate of shoreline changes only at two different times. For more objective and reliable calculation, it is necessary to assess the shoreline changes over time. Meanwhile, the LRR method was shown to be superior because all shoreline data were taken into account during the construction of the regression line. However, when there is much shoreline data with different reliability, the WLR method proved more superior because of limited objective errors. The results show that from 1965 to 2019, the coast of the Son Tra - Cua Dai area had quite complicated fluctuations, of which the northern area (Son Tra) tended to accretion, the central area tends to be alternate between accretion and erosion, while the south area (Cua Dai) is strong to very strong erosion. The coast with sudden changes is the Cua Dai area with the shoreline change envelope (SCE) reaching 512 m. The results also allow us to divide the coast of the Son Tra - Cua Dai area into 30 segments. They are clustered into 8 groups with different levels of erosion and accretion. This is an important basis for the setback zone establishment in the study area.

KW - Coastal erosion

KW - Hoi An

KW - Linear regression

KW - Setback zone

KW - Shoreline changes

UR - http://www.scopus.com/inward/record.url?scp=85099530228&partnerID=8YFLogxK

U2 - 10.15625/0866-7187/42/4/15410

DO - 10.15625/0866-7187/42/4/15410

M3 - Article

AN - SCOPUS:85099530228

VL - 42

SP - 363

EP - 383

JO - Vietnam Journal of Earth Sciences

JF - Vietnam Journal of Earth Sciences

SN - 2615-9783

IS - 4

ER -