Relationships between channelization, sedimentation and sea level in the deltaic environment of the ancient harbor of Lattara, southern France

IF 2.6 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
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Abstract

The impacts of coastal changes and human land use on depositional processes, ecological conditions, geomorphic evolution and harbor works at the archaeological site of Lattara, one of the oldest cities of the northwestern Mediterranean built in a deltaic environment, were investigated from a multi-proxy approach based on sedimentological, biological and geochronological analyses. A distributary channel connected to the ancient harbor of Lattara was deepened and channelized around 200 cal BCE. The drastic increase in water depth caused by channelization was associated with increased flow competence and bedload transport, and could have improved navigation in the harbor area. By contrast, high accumulations of anthropogenic deposits in the channelized stream from the second century CE seem to have negatively affected sediment transport conditions by reducing bedload flux. The construction of a cobble pavement on the western bank of this channelized stream in the fourth century CE was contemporaneous with a sharp decrease in bedload transport showing an abrupt transition to a low energy environment such as in abandoned channels. A drainage ditch was then dug in the deposits of the channelized stream during the Medieval Warm Period, in a context of land use intensification and increased river flooding that led to the deposition of coarser sediments.

法国南部拉塔拉古港三角洲环境中河道化、沉积作用和海平面之间的关系
拉塔拉考古遗址是建在三角洲环境中的地中海西北部最古老的城市之一,研究人员采用基于沉积学、生物学和地质年代学分析的多代理方法,调查了沿海变化和人类土地利用对该遗址的沉积过程、生态条件、地貌演变和港口工程的影响。公元前 200 年左右,连接拉塔拉古港的一条支流河道被加深并渠道化。渠化造成的水深急剧增加与水流能力和基质运移的增加有关,并可能改善了港口地区的航运状况。与此相反,公元二世纪以来渠化河道中大量堆积的人为沉积物似乎对沉积物的迁移条件产生了负面影响,减少了基质通量。公元四世纪,在这条渠化溪流的西岸修建了卵石路面,与此同时,河床载荷迁移量急剧下降,显示出突然过渡到低能量环境(如废弃的河道)。随后,在中世纪温暖时期,人们在渠化溪流的沉积物中开挖了一条排水沟,当时土地利用加剧,河水泛滥,导致更粗糙的沉积物沉积。
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来源期刊
Marine Geology
Marine Geology 地学-地球科学综合
CiteScore
6.10
自引率
6.90%
发文量
175
审稿时长
21.9 weeks
期刊介绍: Marine Geology is the premier international journal on marine geological processes in the broadest sense. We seek papers that are comprehensive, interdisciplinary and synthetic that will be lasting contributions to the field. Although most papers are based on regional studies, they must demonstrate new findings of international significance. We accept papers on subjects as diverse as seafloor hydrothermal systems, beach dynamics, early diagenesis, microbiological studies in sediments, palaeoclimate studies and geophysical studies of the seabed. We encourage papers that address emerging new fields, for example the influence of anthropogenic processes on coastal/marine geology and coastal/marine geoarchaeology. We insist that the papers are concerned with the marine realm and that they deal with geology: with rocks, sediments, and physical and chemical processes affecting them. Papers should address scientific hypotheses: highly descriptive data compilations or papers that deal only with marine management and risk assessment should be submitted to other journals. Papers on laboratory or modelling studies must demonstrate direct relevance to marine processes or deposits. The primary criteria for acceptance of papers is that the science is of high quality, novel, significant, and of broad international interest.
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