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Late-Holocene sea-level reconstruction (1200 BC–AD 100) in the Westergo terp region of the northern Netherlands
Netherlands Journal of Geosciences ( IF 2.7 ) Pub Date : 2021-02-17 , DOI: 10.1017/njg.2021.1
Peter C. Vos , Annet Nieuwhof

In the early 20th century, archaeological research in the terp (artificial dwelling-mound) region of the northern Netherlands focused, besides settlement history, on natural salt-marsh dynamics and sea-level rise. In particular Van Giffen used salt-marsh deposits under dated terp layers to reconstruct the rate of sedimentation of the developing salt marsh and relative sea-level rise. This line of research in archaeology was rekindled during excavations in the terp of Wijnaldum-Tjitsma between 1991 and 1993. Since then, geology has become an integral part of archaeological research in the terp region. This paper focuses on the northwestern part of the province of Friesland (Westergo), where most archaeological terp research during the past three decades has been carried out, owing to several research programmes by the Province of Friesland. The primary aim of the geoarchaeological research is to better understand the interaction between human inhabitants and the salt-marsh landscape. The sedimentary record exposed in the excavation trenches makes it possible to collect data on the development of the coastal environments of the Wadden Sea prior to habitation, including data on sea-level rise. The sea-level data collected in the geoarchaeological studies in Westergo are the topic of this paper. The measured levels of the tidal-flat/salt-marsh boundary underneath the terps make it possible to reconstruct palaeo-Mean High Water (palaeo-MHW) levels. Such sea-level index points (SLIPs), based on marine shell data points from 12 locations, now make it possible to establish a palaeo-MHW diagram for this part of the Wadden Sea, for the period between 1200 BC and AD 100. In this period the palaeo-MHW in the Westergo region rose from c.1.8 m to 0.3 m −NAP: a mean sea-level rise of c.0.12 m per century. We discuss the fact that elevation of the palaeo-MHW SLIP is not only determined by relative sea level (RSL), but also by the magnitude of the tidal amplitude. The tidal range, and therefore the MHW elevations in a tidal basin, can change from place to place and also in time. Also in a single tidal basin the tidal range is variable, due to the distortion of the tidal wave as a result of the morphology of the tidal system. Such local tidal range fluctuations – not related to sea-level rise – influence the palaeo-MHW curve of Westergo and other tidal basins in the Wadden Sea and need to be taken into account when interpreting the curve. In this paper, we will go into the causes of changes in palaeotidal ranges in meso- and macrotidal systems, analyse the tidal range variations in recent and subrecent basins and estuaries and discuss the implications of these changes on the sea-level curve of the Westergo region in NW Friesland.

中文翻译:

荷兰北部 Westergo terp 地区晚全新世海平面重建(公元前 1200 年至公元 100 年)

在 20 世纪初,荷兰北部 terp(人造土丘)地区的考古研究除了定居历史外,还侧重于天然盐沼动态和海平面上升。特别是,范吉芬使用过时的 terp 层下的盐沼沉积物来重建发展中的盐沼的沉积速率和相对海平面上升。1991 年至 1993 年间,在 Wijnaldum-Tjitsma 的挖掘过程中重新点燃了这一考古学研究方向。从那时起,地质学就成为了 terp 地区考古研究的一个组成部分。本文重点关注弗里斯兰省 (Westergo) 的西北部,由于弗里斯兰省的多项研究计划,过去 30 年中大部分考古学研究都在此进行。地质考古研究的主要目的是更好地了解人类居民与盐沼景观之间的相互作用。挖掘沟中暴露的沉积记录使收集有关瓦登海沿海环境在有人居住之前发展的数据成为可能,包括海平面上升的数据。韦斯特戈地质考古研究中收集的海平面数据是本文的主题。terps 下方潮滩/盐沼边界的测量水位使得重建古平均高水位 (palaeo-MHW) 水位成为可能。这样的海平面指数点 (SLIP) 基于来自 12 个地点的海洋贝壳数据点,现在可以为瓦登海的这一部分建立 BC 1200 年至公元 100 年期间的古 MHW 图。C。1.8 m 至 0.3 m -NAP:平均海平面上升C。每世纪 0.12 m。我们讨论了古MHW SLIP的海拔不仅取决于相对海平面(RSL),还取决于潮汐幅度的大小。潮差,因此潮汐盆地中的 MHW 高程可以随地点和时间而变化。同样在单个潮汐盆地中,潮差是可变的,这是由于潮汐系统的形态导致潮汐波的扭曲。这种与海平面上升无关的局部潮差波动会影响 Westergo 和瓦登海其他潮汐盆地的古-MHW 曲线,在解释曲线时需要考虑到这一点。在本文中,我们将探讨中潮和大潮系统中古潮范围变化的原因,
更新日期:2021-02-17
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