土地改変と第4紀地質学 (大規模土地改変と第4紀研究<シンポジウム>)
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概要
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Recently large-scale land transformations especially for residential development have been progressing around the suburbs of the cities. There are several types of land transformation in building residential areas on the hills. The types differ according to geomorphic and geologic characteristics and also by the development of construction instruments. They are called a step-shaped cutting, a flat-type by cutting and filling, and a filled-up-valley type.Since much artificial ground which consists of fill has appeared around the suburbs of the cities, we cannot neglect it in a geological map. It should be treated as a special geologic unit, i.e., an artificial formation.Residential areas built by fill are often deformed by natural phenomena like, earthquakes and rainfalls. When a slump or slide occurs on an inclined land-surface composed of fill, the sliding plane is generated not only on its basal surface but also in the inner part of fill containing mud or clay. Even on the flattened surface which fills up a valley, there occur some deformations like slide, slump and subsidence.Compared with natural sediments, the artificial formation consequently bears some irregularities and differences as well as some characteristics, resulting from its processes. It is pointed out that there is some similarity between the artificial sediments which form a filled-up-valley type residential area and the debris laid on the natural valley floor.It is necessary to investigate the geomorphic development of the valley among the geology of young artificial sediments, for maintaining such artificially formed land in safety.
- 日本第四紀学会の論文
著者
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