Abstract
The effects of bars and tides on shoreline change were investigated by a multiple regression analysis. The shoreline change rates used for the analysis were estimated from the beach profiles measured every workday during a 22-year period from 1986 to 2007 on the Hasaki coast in Japan. The examined parameters which had the potential to affect shoreline change rates were offshore wave energy fluxes, previous shoreline positions, maximum, minimum and average tides, and inner and outer bar crest elevations. In the multiple regression analysis, parameters which affected the shoreline change rate were selected by comparing the multiple regression models developed by combining the parameters on the basis of the Akaike Information Criterion (AIC) value, and the effects were also estimated by using the coefficients of the best model which had the smallest AIC. The shoreline change was affected by not only the offshore wave energy fluxes and the previous shoreline positions but also the maximum and minimum tides and the inner and outer bar crest elevations. The largest effect was the offshore wave energy fluxes, followed in order by the maximum tides, the previous shoreline positions, the minimum tides, the outer bar crest elevations and the inner bar crest elevations.
Highlights
Beach erosion is on the rise in many places around the world and has become a problem
The Akaike Information Criterion (AIC) value of No 1 was about 680 less than that of No 3 and about 85 less than that of No 2. This result confirmed that the wave energy fluxes and the shoreline position and bars and tides contribute to the shoreline change
The effects of bars and tides on shoreline change were investigated by multiple regression analysis
Summary
Beach erosion is on the rise in many places around the world and has become a problem. Beach erosion is expected to be exacerbated by the rise in sea level and extraordinary tropical cyclones due to global warming. Yates et al 2009, Miller and Dean 2004, Katoh and Yanagishima 1988, Davidson et al 2010). Those models assumed that the shoreline change rates could be expressed by the wave energy and the shoreline position. The shoreline position used as an explanatory variable had a function that the beaches that had already advanced or eroded largely tend to recover to their original state, which results from the equilibrium beach profile in wave energy. The function shows that the further the shoreline position retreats, the more shoreline positions tend to advance, and vice versa
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