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16 - The effect of elevation on monsoon rainfall distribution in the central Himalayas

Published online by Cambridge University Press:  05 November 2011

O. N. Dhar
Affiliation:
Indian Institute of Tropical Meteorology
P. R. Rakhecha
Affiliation:
Indian Institute of Tropical Meteorology
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Summary

In this study, an attempt is made to ascertain up to what elevation in the central Himalayas rainfall increases with height. In the central Himalayas there are about 50 rainfall stations which were installed from 1948 onwards in connection with the Kosi dam project and other flood control projects. The mean monsoon (June to October) rainfall data of these stations have been utilized in this study with a view to obtaining a suitable relationship between rainfall and elevation in this section of the Himalayas. This study has shown: (i) that there exist no linear relationships between elevation and monsoon rainfall; (ii) that the elevation and rainfall parameters can best be related by a polynomial of fourth degree; and (iii) rainfall-elevation profiles show that the zones of maximum rainfall occur near the foothills and at an elevation of 2.0 to 2.4 km. Beyond this elevation, rainfall decreases continuously as elevation increases until the great Himalayan range is reached.

Introduction

Hill (1881) made a detailed study of the distribution of rainfall in the northwest Himalayas and found that rainfall increases with elevation up to a height of about 1.2 km and thereafter it diminishes as the elevation increases. In the Sierra Nevada mountains in the USA, the rainfall increases up to a height of 1.5 km (Linsley et al. 1949). Rumley (1965) investigated the distribution of rainfall with elevation in the Andes mountains in Ecuador and found two zones of maximum rainfall along the western and eastern slopes at elevations of 1.0 and 1.4 km respectively.

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Chapter
Information
Monsoon Dynamics , pp. 253 - 260
Publisher: Cambridge University Press
Print publication year: 1981

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