Shoreline Change Short Term

Shorelines are continuously moving in response to winds, waves, tides, sediment supply, changes in relative sea level, and human activities. Shoreline changes are generally not constant through time and frequently switch from negative (erosion) to positive (accretion) and vice versa. Cyclic and non-cyclic processes change the position of the shoreline over a variety of timescales, from the daily and seasonal effects of winds and waves, to changes in sea level over a century to thousands of years. The shoreline "rate of change" statistic thus reflects a cumulative summary of the processes that altered the shoreline for the time period analyzed.海岸线始终处于动态演变之中，其位移受风力、海浪、潮汐、沉积物补给、相对海平面变化以及人类活动等多重因素共同驱动。海岸线的变化通常并非恒定不变，时常会从负向变化（侵蚀）转向正向变化（淤积），反之亦然。周期性与非周期性过程会在不同时间尺度上改变海岸线位置，时间跨度涵盖风浪作用的日、季节尺度，直至百年乃至千年尺度的海平面变化。因此，海岸线‘变化速率’这一统计指标，可反映所分析时段内所有改造海岸线的过程的累积效应。