Assessment of potential beach erosion risk and impact of coastal zone development: a case study on Bongpo–Cheonjin Beach

Abstract. In many parts, coastal erosion is severe due to human-induced zone development and storm impacts, in addition climate change. this study, the beach risk was defined, followed by a quantitative assessment of potential based on three components associated with watershed, development, episodic storms. On an embayed beach, background watershed affects sediment supply from rivers while alongshore redistribution transport caused construction harbor induces shoreline reshaping, for which parabolic-type equilibrium bay shape model adopted. To evaluate during storms, return period (frequency) occurrence evaluated long-term survey data conducted four times per year. Beach carried out each component, results were combined construct curve be used environmental impact assessment. Finally, proposed method applied Bongpo–Cheonjin Gangwon-do, South Korea, support series aerial photographs taken 1972 2017 obtained commencing 2010. The satisfactory outcomes derived study are expected benefit eroding beaches elsewhere.