Recently, omniscape geology was advocated as one of research fields of the engineering geology used for the environmental problem and disaster prevention. However, this research method has not been established enough, and the method is groped for. In this paper, the environmental problem and disaster prevention in the mountainous terrain of Nepal were examined by the viewpoint of the omniscape geology. The results are the followings.
(1) For landscape of the valley and the terrace paddy field, we examined the form and color of landscape by fractal analysis. As the result, it was shown that the landscape in Nepal is similar to the landscape in Shikoku region of Japan.
(2) Between Nepal and Japan, especially the Shikoku region, there are geographical and geological similarities, and is a climatic similarity. Therefore, the landscape between the two regions is similar.
(3) The similarities of geographical and geological features and the similarity of the climate in two regions have the possibility to cause the similar environmental problem and the similar disaster. Therefore, there is a possibility that the biodiversity will decrease by the dilapidation of the terrace paddy field in the future in the mountainous terrain of Nepal. Moreover, the dilapidation of the terrace paddy field will decrease the flood alleviation function.
(4) In the present, the similarity of the valley landscape has caused slope disasters such as collapses and landslides as similar to Shikoku in Japan. However, enough measures cannot be done in Nepal by an economical problem.
(5) Grasping the region targeted by a viewpoint the omniscape geology contributes to the decision of prior measures by the comparison with a similar region where the problem on the environment and disaster prevention has already been caused.