ABSTRACT

The integration of field surveys, bibliographic research and multitemporal analysis of historical maps, aerial photographs and satellite images in a GIS environment, allowed the current and past geomorphological features of the old city of Alessandria and its surrounding areas, NW Italy, to be identified and mapped. Their analysis provided an overview of the geomorphological evolution of the city that is strictly related to the historical vicissitudes occurred since the Middle Ages. Nowadays, the most representative landforms and deposits characterizing the urban landscape result from human interventions and are associated with ancient military facilities and infrastructures, a historical man-made channel network no longer recognizable, the Tanaro riverbed channelization, and the urban sprawl occurred from the second half of the nineteenth century onwards. This study represents a useful tool for urban planning and management and for raising the citizens’ awareness of the urban-landscape geomorphological features and evolution, and therefore the geo-hydrological risk.

摘要

在GIS环境中整合了实地调查，书目研究以及对历史地图，航拍照片和卫星图像的多时相分析，从而可以识别出意大利亚历山德里亚及其周边地区的当前和过去的地貌特征，并映射。他们的分析概述了该城市的地貌演变，这与中世纪以来发生的历史变迁严格相关。如今，最具代表性的地貌和沉积物是人类干预的结果，并与古代的军事设施和基础设施，不再被认可的历史悠久的人造河道网络，塔纳罗河床河道，从19世纪下半叶开始出现城市蔓延。这项研究为城市规划和管理以及提高公民对城市景观地貌特征和演变以及由此带来的地文水文风险的认识提供了有用的工具。