Assessing the recent subsidence of the central coastal Delta of Bangladesh by dating submerged kiln

恒河-雅鲁藏布江三角洲因俯冲相关的构造沉降（约 1 毫米/年）而缓慢沉降，而由于厚达 60 米的全新世泥浆的压实（估计为 1-4 毫米/年），沉降速度更快。两座水下窑址相距 35 公里，有四到六座箱形窑址，由于侵蚀而暴露在三角洲当前的海岸上，在退潮时可以进入。将测量它们目前在海平面以下的确切位置，并通过窑砖墙的发光测年确定淹没的时间。结果用于确定海岸的连续或逐步沉降。很少有试点数据表明东部最深的窑炉（距高潮以下约 2 m）已于 250 年前被洪水淹没（通过热释光测定陶器年代），因此，这些地点将提供与现代三角洲直接相关的信息。此外，用于陶器或制盐的窑炉将在被热带气旋完全淹没或破坏之前进行采样、记录和存档。

The delta of the Ganges‐Brahmaputra slowly subsides by subduction‐related tectonic subsidence (about 1 mm/a) and more rapidly due to compaction of the up to 60 m‐thick Holocene muds (estimated as 1‐ 4 mm/a). Two submerged kiln sites, 35 km apart from each other, with four to six box‐shaped kiln constructions are exposed by erosion at the current coast of the delta and are accessible during ebb tides. Their present exact position below sea level will be measured and the timing of submergence will be determined by luminescence dating of the kiln brick walls. The results are used to determine the continuous or stepwise subsidence of the coast. Few pilot data suggest the deepest eastern kiln (about 2 m below high tide) has been flooded 250 years ago (pottery dated by thermoluminescence) and, thus, the sites will yield information, which is of direct relevance for the modern delta. Furthermore, the kiln which were either used for pottery or for salt production will be sampled, documented and archived before their complete submergence or destruction by tropical cyclones.