 |
| Titel |
Debris flood hazard documentation and mitigation on the Tilcara alluvial fan (Quebrada de Humahuaca, Jujuy province, North-West Argentina) |
| VerfasserIn |
G. Marcato, G. Bossi, F. Rivelli, L. Borgatti |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1561-8633
|
| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 12, no. 6 ; Nr. 12, no. 6 (2012-06-13), S.1873-1882 |
| Datensatznummer |
250010920
|
| Publikation (Nr.) |
 copernicus.org/nhess-12-1873-2012.pdf |
|
|
|
|
|
| Zusammenfassung |
For some decades, mass wasting processes such as landslides and debris
floods have been threatening villages and transportation routes in the Rio Grande
Valley, named Quebrada de Humauhuaca. One of the most significant examples
is the urban area of Tilcara, built on a large alluvial fan. In recent
years, debris flood phenomena have been triggered in the tributary valley of the
Huasamayo Stream and reached the alluvial fan on a decadal basis.
In view of proper development of the area, hazard and risk assessment
together with risk mitigation strategies are of paramount importance. The
need is urgent also because the Quebrada de Humahuaca was recently included
in the UNESCO World Cultural Heritage. Therefore, the growing tourism
industry may lead to uncontrolled exploitation and urbanization of the
valley, with a consequent increase of the vulnerability of the elements
exposed to risk. In this context, structural and non structural mitigation
measures not only have to be based on the understanding of natural
processes, but also have to consider environmental and sociological factors
that could hinder the effectiveness of the countermeasure works.
The hydrogeological processes are described with reference to present-day
hazard and risk conditions. Considering the socio-economic context, some
possible interventions are outlined, which encompass budget constraints and
local practices. One viable solution would be to build a protecting dam
upstream of the fan apex and an artificial channel, in order to divert the
floodwaters in a gully that would then convey water and sediments into the
Rio Grande, some kilometers downstream of Tilcara. The proposed remedial
measures should employ easily available and relatively cheap technologies
and local workers, incorporating low environmental and visual impacts
issues, in order to ensure both the future conservation of the site and its
safe exploitation for inhabitants and tourists. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|