NDLI: Geomorphological mapping for route selection and road construction at lower Kihansi in Tanzania

Content Provider	Springer Nature Link
Author	Marwa, Ernest M. M. Kimaro, Didas N.
Copyright Year	2005
Abstract	This paper reports the use of geomorphological mapping to obtain a better understanding of the terrain for the Lower Kihansi Dam Access Road in the Udzungwa Mountains. The long-term accessibility of the road and protection of the natural resources of the area were pre-conditions for the construction of this road, which was primarily to facilitate the transportation of equipment, machinery and personnel during construction of a 54,000 m3 concrete gravity dam related to a 180-MW hydropower station. Black and white vertical aerial photographs supplemented with field mapping were used to prepare a 1 : 5,000 geomorphological map of a possible route corridor. The mapping identified areas with unfavourable ground conditions which were subsequently studied and characterized in order to select the final route. In sections where it was not possible to deviate the road from the unfavourable areas, protection and stabilization measures were considered during the design and construction phases. The road was constructed successfully and without causing damage to the environment. Geomorphological mapping proved to be a useful tool in selecting the optimum route and appropriate construction method.L’article présente comment la cartographie géomorphologique a permis d’aider au choix du tracé de la route d’accès au barrage de Kihansi aval, dans les montagnes de Udzungwa. L’accessibilité de cette route à long terme et la protection des ressources naturelles de la région ont présidé au choix du tracé. Cette route a pour première fonction de permettre le transport des équipements et du matériel ainsi que du personnel pendant la construction du barrage poids en béton de 54000 m3, qui alimente une centrale hydroélectrique de 180 MW. Des photographies aériennes panchromatiques en appui à des travaux cartographiques de terrain ont permis d’établir la carte gèomorphologique au 1/5000 d’un possible fuseau pour cette route. Cette cartographie a mis en évidence les zones de terrain défavorable qui ont fait l’objet d’études complèmentaires afin de décider du choix final du tracé. Pour les sections où les zones de terrain défavorable ne pouvaient être évitées, des techniques de protection ou de stabilisation des terrains ont été définies en phase de conception et mises en œuvre durant la construction. La route a été construite avec succès et sans créer de dommage à l’environnement. La cartographie géomorphologique a montré sa capacité à contribuer au choix d’un tracé routier et à celui de méthodes de construction adaptées.
Starting Page	333
Ending Page	339
Page Count	7
File Format	PDF
ISSN	14359529
Journal	Bulletin of the International Association of Engineering Geology - Bulletin de l'Association Internationale de Géologie de l'Ingénieur
Volume Number	64
Issue Number	4
e-ISSN	14359537
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-10-07
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Udzungwa Mountains Gullies Landslides and geomorphological mapping Nature Conservation Geoecology/Natural Processes Structural Foundations, Hydraulic Engineering Applied Geosciences
Content Type	Text
Resource Type	Article
Subject	Geology Geotechnical Engineering and Engineering Geology

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