大山火山における地形面の分布について
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概要
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The purpose of the present study is to classify the surface of Daisen Volcano based on the distribution of geomorphic surfaces of the volcano. Daisen Volcano is located in the western part of Tottori Prefecture. It is a large-sized volcano that is about 38km. long from east to west, and about 25km. long from north to south. The writer has tried to make clear the distribution of geomorphic surfaces based upon the topographic contour map (Fig. 1), projected profiles of sixteen compass directions (Fig. 2), stream pattern (Fig. 3), stream fraequency (Tab. 1), stream densities (Tab. 2), restored geomorphological map (summit level, Fig. 4), and distribution of geomorphic surfaces (Fig. 5). The main conclusions are as follows : The geomorphic surfaces in the Daisen Volcano are classified into five parts. (1) Eastern and Northeastern slopes. The length of the slope is about 25km. and the mean inclination of the slope is about 2.8°. The slope from the middle to the upper part indicates that it is at its mature stage topographically, that is, there are few depositional surfaces. But there remain the wide depositional surfaces in the lower slope below 200meters above the sea. (2) Northern slope. The length of the slope is about 17km. and the mean inclination of the slope is about 3.0°. The depositional surfaces remain from the upper slope to the seaside. There are many small dissected valleys in them. But the wide depositional surface can be restored on the summit level map. (3) Western slope. The length of the slope is about 17km. and the mean inclination is about 4.0°. It is the steepest slope in the Daisen Volcano. The wide original surfaces remain from upper slope to the River Hino and there are a few small shallow dissected valleys in them. (4) Southern slope. The length of the slope, about 10km., is the shortest in the volcano and the mean inclination is about 3.8°. The erosional stage is like that of the eastern slope. But the wide depositional surfaces are in the bottom of the valleys where head-ward erosion reaches to the center of the volcano. (5) Hiruze Basin slope. The length of the slope is about 15km., and the mean inclination, about 2.5°, is the most gentle slope in the volcano. The erosional stage is going on like that of the eastern slope, but the wide original surfaces still do remain.
- 湘南工科大学の論文
- 1971-03-31