ABSTRACT

This paper presents the results of geohazards mapping and evaluation their role in the modifying of the urban landscape in Poznań, Poland. Information on geohazards specific to an urban lowland area (river floods, flash floods, mass movement, wind erosion) because of increasing climate change was compiled into a geomorphological map. The most spatially widespread geohazards in Poznań include: (a) on moraine hills/uplands: mass movement, wind erosion, and flash floods (4.9% of the city area); (b) on outwash plains: mass movement and flash floods (8.6% of the city area); (c) on fluvial landforms: mass movement and river floods (9.8% of the city area); (d) within plains of various origin: flash floods (7.6% of the city area). Mass movement affecting short but numerous (and locally steep) slopes, and flash floods are the most widespread geohazards (16 and 14%, of Poznań’s area, respectively). Extensive urbanisation especially the expansion of impervious surfaces increases the high risk of flash floods.

摘要

本文介绍了地质灾害测绘的结果，并评估了它们在波兰波兹南城市景观改造中的作用。由于气候变化加剧，城市低地地区特有的地质灾害信息（河流洪水、山洪暴发、群众运动、风蚀）被编入地貌图。波兹南空间分布最广的地质灾害包括： (a) 在冰碛山丘/高地上：群众运动、风蚀和山洪暴发（占城市面积的 4.9%）；(b) 在外冲平原上：群众运动和山洪暴发（占城市面积的 8.6%）；(c) 在河流地貌上：群众运动和河流洪水（城市面积的 9.8%）；(d) 在不同起源的平原内：山洪暴发（占城市面积的 7.6%）。影响短而多（且局部陡峭）的斜坡的群众运动，和山洪暴发是最普遍的地质灾害（分别占波兹南地区的 16% 和 14%）。广泛的城市化，尤其是不透水表面的扩张，增加了山洪暴发的高风险。