Multi-decadal Evolution and North Atlantic Oscillation Influences on the Dynamics of the Danube Delta Shoreline

4区地球科学 Q3 Earth and Planetary Sciences

Journal of Coastal Research Pub Date : 2024-03-29 DOI:10.2112/jcr-si50-031.1

A. Vespremeanu‐Stroe, Ş. Constantinescu, F. Tătui, L. Giosan

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引用次数: 42

Abstract

VESPREMEANU-STROE, A.,CONSTANTINESCU, Ş., TĂTUI, F. and GIOSAN, L., 2007. Multi-decadal Evolution and North Atlantic Oscillation Influences on the Dynamics of the Danube Delta Shoreline. Journal of Coastal Research, SI 50 (Proceedings of the 9th International Coastal Symposium), 157 – 162. Gold Coast, Australia, ISSN 0749.0208 A comprehensive analysis of data collected over the last five decades on the Danube delta coast (topographic maps, satellite imagery, GPS surveys and beach profiles) revealed two different shoreline dynamics patterns: (1) high mobility during 1961-1979 interval with high retreating and; (2) advancing rates and low mobility afterwards (1979-2006). The divergence zones in the longshore sediment transport system experienced the highest rates of retreat (~20 m/yr and ~10 m/yr in the first/second time interval), whereas the shoreline advanced fastest along the coast of active lobes (i.e., Chilia and Sf. Gheorghe lobes). During the second interval the decrease of shoreline changes rates was similar for the erosive beaches (with 55-66%) and non-uniform for the accretionary coasts (20-61% for open beaches and 80% for the sheltered secondary deltas). Wind data analysis reveals a good connection between multi-decadal winter storm frequency along the Danube delta coast and negative NAO phases (r = -0.76). The results of the present study clearly show that shoreline changes at decadal time scales are also ultimately driven by the NAO which controls the storminess on the Danube delta coast. ADDITIONAL INDEX WORDS: shoreline retreat/advance, longshore sediment transport (LST), storms, multi-decadal climate variability, Black Sea

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多瑙河三角洲海岸线的十年演变和北大西洋涛动对其动态的影响

VESPREMEANU-STROE, A.,CONSTANTINESCU, Ş., TĂTUI, F. and GIOSAN, L., 2007.Multi-decadal Evolution and North Atlantic Oscillation Influences on the Dynamics of the Danube Delta Shoreline.Journal of Coastal Research, SI 50 (Proceedings of the 9th International Coastal Symposium), 157 - 162.澳大利亚黄金海岸，ISSN 0749.0208 对过去五十年多瑙河三角洲海岸收集的数据（地形图、卫星图像、全球定位系统调查和海滩剖面图）进行综合分析，发现了两种不同的海岸线动态模式：(1) 1961-1979 年间的高流动性与高后退；(2) 此后（1979-2006 年）的前进率与低流动性。长岸沉积物输运系统中的分流区的后退速度最快（在第一个/第二个时间区间分别为约 20 米/年和约 10 米/年），而活跃裂片（即 Chilia 和 Sf. Gheorghe 裂片）沿岸的海岸线前进速度最快。在第二个时间间隔内，侵蚀性海滩的海岸线变化率下降幅度相似（55%-66%），而增生海岸的海岸线变化率则不均匀（开阔海滩为 20%-61%，受庇护的次级三角洲为 80%）。风力数据分析显示，多瑙河三角洲沿岸多年冬季风暴频率与负 NAO 相位之间存在良好联系（r = -0.76）。本研究结果清楚地表明，海岸线在十年时间尺度上的变化最终也是由控制多瑙河三角洲沿岸风暴的西北风环流所驱动的。补充索引词：海岸线后退/前进、沿岸沉积物输送（LST）、风暴、十年期气候多变性、黑海

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来源期刊

Journal of Coastal Research 地学-地球科学综合

自引率

0.00%

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审稿时长

3-8 weeks

期刊介绍： The Journal of Coastal Research (JCR) is one of the leading international journals for coastal studies and processes, and is published bi-monthly by the Coastal Education & Research Foundation [CERF]. By covering the entire field of coastal research, the JCR encompasses all subjects relevant to natural and engineered environments (freshwater, brackish, or marine) and the protection/management of their resources in the vicinity of coastlines of the world. Even though the journal broadly focuses on immediate shoreline zones, the JCR also embraces those coastal environments that either reach some indefinite distance inland or that extend seaward beyond the outer margins of the sublittoral (neritic) zone. The JCR disseminates accurate information to both the public and research specialists around the world on all aspects of coastal issues in an effort to maintain or improve the quality of our planet''s shoreline resources.