This study focuses on the muddy-coastal headland bay beaches in Zhejiang Province,identifies the primary factors influencing the position of the sand-mud boundary,and analyses the transition mechanism.A depth formula of the sand-mud boundary point in headland bay beaches is proposed.The results show that:the tide level,wave height,beach slope and spring mean tide range in front of the beach are the main factors affecting the location of sand-mud boundary;the depth of sand-mud boundary is positively correlated with the 1/10 wave height in front of the beach and the spring mean tide range,and negatively correlated with the slope of the beach;the position of the sand-mud boundary exhibits seasonal and inter-annual variations.During summer,the sand-mud boundary tends to shift seaward and decrease in elevation,while in winter,it moves landward.Notably,in 2020,compared to 2019,the sand-mud boundary showed a clear trend of seaward migration and a decrease in elevation.
embayed beachsand-mud transitionmuddy coastevolutionary mechanismempirical formula
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