Abstract Southeast Asian coastal environments are undergoing massive transformations with unprecedented population and infrastructure development. These transformations are occurring on a backdrop of intense natural and anthropogenic environmental change, which are increasing the risk to the burgeoning coastal population. Little is known about how central Vietnamese coastal environments have changed naturally since the mid-Holocene sea-level highstand and how recent anthropogenic change and sea-level variation have affected the coastal system. The Chan May embayment in central Vietnam allows us to examine how recent changes in both anthropogenic development and sea-level change have affected the coastline. The embayment preserves a series of prograding beach ridges and is subject to intense human pressures with the construction of a large economic and industrial park, and expansion of tourist facilities. Using ground penetrating radar and quartz optical dating we identify a switch from 6000 years of prograding beach ridges to transgressive dunes within the past century resulting in a decreasing rate of beach ridge progradation possibly in the last 100 years. The recent modes of sediment deposition through washovers and a transgressive dune indicates that coastal progradation has slowed and might have stopped.

中文翻译：

---

越南中部 Chan May 沿海海湾的全新世演化：与中晚期全新世海平面变化可能迫使的海进速率下降相关的沿海动态变化

摘要 东南亚沿海环境正经历着前所未有的人口和基础设施发展的巨大转变。这些转变发生在剧烈的自然和人为环境变化的背景下，这增加了新兴沿海人口的风险。自全新世中期海平面高位以来，越南中部沿海环境如何自然变化，以及最近的人为变化和海平面变化如何影响沿海系统，我们知之甚少。越南中部的 Chan May 海湾使我们能够研究最近人为发展和海平面变化的变化如何影响海岸线。海湾保留了一系列渐进的海滩山脊，随着大型经济和工业园区的建设以及旅游设施的扩建，受到了强烈的人类压力。使用探地雷达和石英光学测年，我们确定了过去一个世纪内从 6000 年的前移海滩山脊到海侵沙丘的转变，这可能导致过去 100 年里海滩山脊前移的速度下降。最近通过冲刷和海侵沙丘的沉积物沉积模式表明，沿海进积已经放缓并可能已经停止。使用探地雷达和石英光学测年，我们确定了过去一个世纪内从 6000 年的前移海滩山脊到海侵沙丘的转变，这可能导致过去 100 年里海滩山脊前移的速度下降。最近通过冲刷和海侵沙丘的沉积物沉积模式表明，沿海进积已经放缓并可能已经停止。使用探地雷达和石英光学测年，我们确定了过去一个世纪内从 6000 年的前移海滩山脊到海侵沙丘的转变，这可能导致过去 100 年里海滩山脊前移的速度下降。最近通过冲刷和海侵沙丘的沉积物沉积模式表明，沿海进积已经放缓并可能已经停止。