As is the case with many deltas in the world, the Po Delta (Italy) and its barrier systems have experienced severe modifications over the last century as a consequence of anthropogenic subsidence and river input decrease. The interruption of subsurface fluid withdrawals in the early 1960s created an opportunity to evaluate the effects of the subsequent subsidence decrease along the 11 km of beaches and 45 km of barrier islands of the Po Delta, and improve the understanding of coastal system response to relative sea level rise. To this aim, shoreline and bathymetric multi-decadal dataset were coupled with the local rate of subsidence and classified with a geomorphic - response approach. From 1954-78, a mean shoreline variation of −224 m (−9.34 m y⁻¹) occurred under high rates of subsidence (14–43 mm y⁻¹) with a diffuse process of landward barrier rollover (up to 1124 m), frequently associated with break-up. This phase is evidenced by the diffuse sinking of the shoreface (up to 4 m), the negative upper shoreface sediment budget and the parallel drowning of the cross-shore profiles highlighted by the 1968–2008 bathymetric dataset. Despite the loss of altimetry and shoreline retreat being almost irrecoverable, during the period from 1978 to 1996 and 1996 to 2014 barrier islands experienced a stabilisation in response to a decrease in the subsidence rates down to 6 mm y⁻¹. The mean rates of shoreline changes (−0.25 and + 1.51 m y⁻¹ respectively) are the results of different local behaviour with progressively dominant longshore processes and progradation at the most active fluvial branches. The most recent bathymetric data (2008–2014) confirm this reversal trend, both in the altimetry differences and in the upper shoreface sediment budget. This trend is at odds with signals from many of the world's deltas and represents an important issue for the present and future coastal management and adaptation plans.

与世界上许多三角洲的情况一样，由于人为沉降和河流输入减少，波河三角洲（意大利）及其屏障系统在上个世纪经历了严重的变化。1960 年代初期地下流体抽取的中断为评估随后沿波三角洲 11 公里海滩和 45 公里障壁岛的沉降减少的影响提供了机会，并增进了对沿海系统对相对海的响应的理解水平上升。为此，海岸线和水深多年代际数据集与当地沉降率相结合，并使用地貌响应方法进行分类。从 1954-78 年，-224 m (-9.34 my ^-1 )的平均海岸线变化发生在高沉降率(14-43 mm y^-1 ) 具有向陆障碍翻滚的扩散过程（高达 1124 m），经常与破裂有关。1968-2008 年测深数据集突出显示的岸面扩散下沉（高达 4 m）、负的上岸面沉积物收支以及跨岸剖面的平行淹没证明了这一阶段。尽管高度测量和海岸线后退几乎无法恢复，但在 1978 年至 1996 年和 1996 年至 2014 年期间，由于沉降率下降至 6 mm y ^{-1 ，}障壁岛经历了稳定。海岸线变化的平均速率（-0.25 和 + 1.51 我的^-1分别）是不同地方行为的结果，在最活跃的河流分支处逐渐占主导地位的沿岸过程和进积。最新的测深数据（2008-2014）证实了这种逆转趋势，无论是在测高差异还是在上岸面沉积物收支中。这种趋势与来自世界许多三角洲的信号不一致，代表了当前和未来沿海管理和适应计划的一个重要问题。