ABSTRACT

The city of Antananarivo is located in the central highlands of Madagascar, and is the largest urban center of the island. Considering the frequent heavy cyclonic rains frequently affecting the area, its geomorphological context is particularly prone to geo-hydrological hazards, such as landslides and flash floods, as recently proved during the disastrous events of the winters of 2015 and 2018. Field data and high-resolution remote sensing data interpretation (DEMs and satellite orthophotos) were combined in order to produce detailed hydrographic and geomorphological maps. The aim was to understand the processes acting in the Analamanga hill area, with special regards to the effect of human activity in modeling the natural landforms and exacerbating the geo-hydrological hazards. The obtained maps will provide management-planning tools to be used as a first step towards a risk reduction strategy in the Antananarivo historical urban center.

摘要

塔那那利佛市位于马达加斯加的中央高地，是该岛最大的城市中心。考虑到频繁的强旋风降雨经常影响该地区，最近在2015年和2018年冬季的灾难性事件中证明，其地貌背景特别容易发生地质水文灾害，例如滑坡和山洪。高分辨率遥感数据解释（DEM和卫星正射影像）相结合，以产生详细的水文和地貌图。目的是了解Analamanga丘陵地区的活动过程，并特别考虑人类活动对自然地形建模和加剧地球水文危害的影响。