Abstract
Cua Dai estuary belonged to Quang Nam province is considered to be one of the localities of Vietnam having a complex erosion and accretion process. In this area, sandbars are recently observed with lots of arguments about the causes and regimes of formation. This could very likely result of not reliable source of information on shoreline evolution and a lack of historical monitoring data. Accurately identification of shoreline positions over a given period of time is a key to quantitatively and accurately assessing the beach erosion and accretion. The study is therefore to propose an innovative method of accurately shoreline positions for an analysis of coastal erosion and accretion in the Cua Dai estuary. The proposed technology of multitemporal remote sensing and digital evaluation model with tidal correction are used to analyse the changes in shoreline and estimate the rate of erosion and accretion. An empirical formula is, especially, exposed to fully interpret the shoreline evolution for multiple scales based on a limitation of satellite images during 1965 to 2018. The results show that there is a significant difference of shoreline shift between corrections and non-corrections of tidal. Erosion process tends to be recorded in the Cua Dai cape located in the Cua Dai ward, especially in the An Luong cape located in the Duy Hai commune with the length of 1050 m. Furthermore, it is observed that there is much stronger erosion in the north side compared with south side of Cua Dai estuary.
Highlights
Estuary and coastal zone located along the Quang Nam province of Vietnam frequently affected by the types of disaster such as tropical cyclones, floods, accretion/erosion processes and shifting water flow and level
The values of shoreline shift (a) in the Equation 1 are relatively small ranging from 0.62 to 16.27. The reason for this is due to negligible values of beach slope and tidal level in the Cua Dai estuary
The study proposed an innovative method on the basic of a combination multitemporal remote sensing and digital evaluation model with a tidal correction
Summary
Estuary and coastal zone located along the Quang Nam province of Vietnam frequently affected by the types of disaster such as tropical cyclones, floods, accretion/erosion processes and shifting water flow and level. The entry and exit activities of ships and boats, tourism and seafood exploitation services are directly affected This has been drawing special attentions of national and international scientists. In the evolution of the Cua Dai estuary, Quang Nam province, it is observed that human activities (e.g., exploitation of sand) are main factors caused the strong erosion processes. To overcome this problem, Vietnam government and investors in nation and international are spent hundreds of billions of VND for Cua Dai beach [3]. Vietnam government and investors in nation and international are spent hundreds of billions of VND for Cua Dai beach [3] To overcome these big issues, there is a need to accurately clarify the shoreline changes
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