Quantitative Study of the Slope Development of Fluvial Terrace Scarps

在秩父盆地和沿着Sai和Oi河的河流阶地陡坎上，用单位跨度为2米的坡度剖面仪测量了坡度剖面。研究的阶地陡坎高度为2.5 ~ 90 m，平均倾角为7 ~ 90 °，距今约0.5 ka B。P.至30 ka B. P.在陡崖时代。岩石为白垩纪和第三纪沉积岩，真倾角为15 ° ~ 90 °。大多数简介分为三个部分：根据实测和估算的陡坎年龄、陡坎初始高度、相对倾角和基岩力学性质等变量，建立了任意地点和给定时间内，三个陡坎段的坡率和坡高比变化率的公式。和气候条件。

Slope profiles were measured with a slope profiler having a unit span of 2 meters on the fluvial bedrock-terrace scarps in the Chichibu Basin and along the Sai and Oi Rivers. The terrace scarps studied range from 2.5 m to 90 m in height, from 7 to 90 degree in mean angle, and from 0.5 ka B. P. to 30 ka B. P. in the scarp age. The bedrocks are Cretaceous and Tertiary sedimentary rocks ranging from 15ﾟ to 90ﾟ in true dip. Most of the profiles were divided into three segments : crstal convex, middle straight and basal concave segments.The rate of slope decline and the rate of changes in the height ratio of each of the three segments at an arbitrary site and at a given time were formulated in terms of the practically measured and estimated variables such as scarp age, initial height of scarp, retive dip and mechanical properties of bedrock, and climatic condition.