3D modeling of the impact of ancient Yellow River floods on urban landscapes: A new look at the late imperial landscape at the Shuntianmen Site of Kaifeng City, Henan Province, China

Floods had a massive impact on the development of ancient cities around the world and understanding this phenomenon constitutes an essential part of the history of long-term and dynamic human–environment interactions. There remains, however, an enormous challenge in identifying records of ancient floods in urban environments due to various sedimentation and postdepositional processes that often remove, erase, and alter such environmental records. During archaeological excavations in the famous historic city of Kaifeng, we identified records of two historical floods at the Shuntianmen site. Related stratums were carefully studied, from which dating and sediment samples were collected. These excavated stratums were also scanned to obtain digital data for modeling. Combining these data, we then applied three-dimensional modeling to reconstruct the evolution of the natural and cultural landscape of the site since the Northern Song Dynasty (960–1127 AD), which was not possible in previous studies due to the deep burial of archaeological strata. Our results indicate that the two floods occurred during the late Ming Dynasty (1368–1644 AD) and the Qing Dynasty (1636–1912 AD), respectively. During the Northern Song Dynasty, Shuntianmen was an important part of Kaifeng, which was, at that time, the capital of China and one of the largest cities in the world. Later, during the Yuan and Ming dynasties, Shuntianmen became a suburban settlement situated along various traffic routes. During the Qing Dynasty, the area became a small village. Subsequently, the area was completely abandoned and deserted until modern Kaifeng, which was built at the same place. The evolution of the regional landscape is the direct result of the interaction between the natural environment and human activities, among which the precarious alluvial processes of the Yellow River were playing an increasingly vital role. Over the centuries, the Yellow River floods, warfare, and wind-blown sand accumulation reduced the Kaifeng region from a prosperous capital to a comparatively deserted area.