Palaeo debris-flow activity and implications for the Qiaotou archaeological site, upper Qiantang River, eastern China

IF 5.7 1区农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Catena Pub Date : 2025-05-31 DOI:10.1016/j.catena.2025.109188

Yiting Xu , Zhou Lin , Joseph Desloges , Wenjia Zhang , Leping Jiang

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引用次数: 0

Abstract

Local and regional geomorphic processes can be important determinants of patterns of human occupation during the early Holocene. Through a combination of complementary methods of sedimentology, GPR and terrain analysis, Late-Pleistocene and Holocene piedmont fan building are reconstructed around Qiaotou archaeological site in the lower Yangtze River region of China. Qiaotou site occupation was dominated by the Shangshan Culture (10–8.5 ka BP), the earliest Neolithic culture in eastern China.

Excavated sedimentary outcrops and radiocarbon dating indicate intense debris-flow and hyperconcentrated-flow activities at the Qiaotou site since the late Pleistocene (31, 8, 7, ∼6.2, 4ka cal BP). The GPR survey reveals debris flow activity has dominated an area that extends about 2.4–3 km outwards from the fan apex encompassing the Qiaotou site. Morphometric analysis of fan-building in mountain watersheds around Qiaotou suggests that most of the tributary basins feeding the fan have higher Melton ratios and thus are prone to produce debris flows in the underlying erodible sedimentary rock.

The comprehensive investigations around the Qiaotou archaeological site provide a better understanding of the occurrence and intensity of the debris flow activities as well as the association between Holocene climate fluctuations and local geomorphic changes. These results first unveil palaeo environments in the upstream reaches of the Qiantang River, and provide crucial information regarding the relationship between Holocene environmental changes and settlement abandonment.

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钱塘江上游桥头遗址古泥石流活动及其意义

局部和区域地貌过程可能是全新世早期人类活动模式的重要决定因素。通过沉积学、探地雷达和地形分析相结合的互补方法，在长江下游地区桥头考古遗址周围重建了晚更新世和全新世的山前扇构造。桥头遗址以中国东部最早的新石器文化——上山文化（10-8.5 ka BP）为主导。出土的沉积露头和放射性碳定年表明，晚更新世（31,8,7,~ 6.2,4ka cal BP）以来，桥头遗址存在强烈的碎屑流动和高浓度流动活动。探地雷达调查显示，泥石流活动主导了一个区域，从围绕桥头遗址的扇顶向外延伸约2.4-3公里。对桥头附近山地流域扇造造的形态计量学分析表明，大多数扇造造的支流盆地具有较高的梅尔顿比，因此在下部可蚀沉积岩中容易产生泥石流。通过对桥头考古遗址周围的综合调查，可以更好地了解泥石流活动的发生和强度，以及全新世气候波动与当地地貌变化的关系。这些结果首次揭示了钱塘江上游的古环境，为全新世环境变化与聚落废弃的关系提供了重要信息。

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来源期刊

Catena 环境科学-地球科学综合

CiteScore

10.50

自引率

9.70%

发文量

816

审稿时长

54 days

期刊介绍： Catena publishes papers describing original field and laboratory investigations and reviews on geoecology and landscape evolution with emphasis on interdisciplinary aspects of soil science, hydrology and geomorphology. It aims to disseminate new knowledge and foster better understanding of the physical environment, of evolutionary sequences that have resulted in past and current landscapes, and of the natural processes that are likely to determine the fate of our terrestrial environment. Papers within any one of the above topics are welcome provided they are of sufficiently wide interest and relevance.