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Rapid geomorphological reconnaissance survey for road alignment in West Nepal

  • G. J. Hearn
Article

Abstract

A rapid geomorphological reconnaissance survey of the 112 km Baitadi-Darchula road currently under construction in the Middle Himalaya of West Nepal is described. The first 39 km of the proposed road was under construction when this 5 day survey commenced, to cover both the initial segment as well as an examination of the stability and practicability of the remainder of the alignment. A combination of landslide and erosion mapping along the proposed alignment and interpretation of air photographs led to the recommendation to abandon the remainder of the alignment and adopt an alternative route, considered to be more stable. The findings were later endorsed by a detailed feasibility study and preliminary design thus supporting the cost-effective use of rapid geomorphological surveys for engineering projects in unstable mountain terrain.

Keywords

Valley Side Reconnaissance Survey Road Research Laboratory Geomorphological Survey Area Location Plan 

Reconnaissance géomorphologique rapide d'un tracé routier dans l'Ouest du Népal

Résumé

L'article décrit la reconnaissance géomorphologique rapide des 112 km de la route entre Baitadi et Darchula actuellement en construction dans l'Ouest du Népal. Les 39 premiers kilomètres étaient en construction lorsque cette étude de 5 jours a débuté englobant à la fois le tronçon déjà en travaux et l'examen de la stabilité et de la faisabilité du reste du tracé. Une cartographie des glissements de terrain et des phénomènes d'érosion le long du tracé proposé, combinée à l'étude des photographies aériennes, a conduit à recommander l'abandon du tracé prévu et le choix d'un tracé de remplacement, considéré comme plus stable. Ces options furent confirmées plus tard lors de l'étude de faisabilité détaillée, confortant ainsi l'intérêt financier de l'utilisation des reconnaissances géomorphologiques rapides pour des projets dans des zones montagneuses instables.

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Copyright information

© International Association of Engineering Geology 1993

Authors and Affiliations

  • G. J. Hearn
    • 1
  1. 1.Scott Wilson Kirkpatrick & PartnersBasingstokeUK

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