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  • 加藤 哲也, 中田 高, 成瀬 敏郎
    地理科学
    1966年 6 巻 65-77
    発行日: 1966/12/15
    公開日: 2017/04/08
    ジャーナル フリー
    The Abu river with 83km in length and 593km^2 in drainage area has its drainage in the northwestern part of Yamaguchi prefecture and pours into the Ses of Japan in the City of Hagi. It is generally believed that volcanic activies and resultant changes of river system occurred in the upper part of this river. Except for M. Oga's study there is no detailed geomorphological study based on field survey of the process of these changes The authors conducted investigation of remnant geomorphic surfaces (mainly their altitudes and surface conditions) and their deposits, in order to understand the geomorphological history of this area. The process of changes of this river system may be sumarized as follows: 1) The upper branches upwards than the Deaibuchi depths of the Abu river was the upper ones of the Tsuwano river and flewn towards north-east. The upper streams upwards than Yokoyama of the Saba river jointed the Tsuwano river at Yoro. On the other hand, the Ikumo river, one of the bra nches of the Abu river, belonged to the drainage of the Abu river before. These phenomena are deduced by the altitude of the surface of basement complex. 2) Eruptions of the Miharayama lava dome group took place just on the river course of the Tsuwano. 3) There emerged former lake Tokusa dammed by the above volcanic bodies. The altitude of the lake level was about 320m. in height and the lake extended its area as far as the upper parts of the rivers Shinome and Saba. However, the basin of the Ikumo river was not covered with the lake. These occurences are deduced from the distribution of the lacustrine terraces and the above-mentioneed deposits. Emergence of the former lake is urgued by E.Takahashi to be dated in the lacustrine deposits. However, geomorphological evidences to fully support his thesis has not yet obtained by the present writers. 4) The lake water began to drain from the Deaibuchi depths of the Chomon gorge and river courses were converted from the former direction to present-day ones. On the other hand near Tokusa town-ship, there remained a small dammed-lake. by meanes of deltaic doposits of the branch 5) Following the subsidence, the lacustrine terraces were dissected or covered with talus deposits and the branches made fans on and/or blow the lacustrine terrace. In the basin of the Matsumoto river, the river meandered and formed terraces at several levels. At early tme of the subsiding the Saba river captiured.
  • 稻見 悦治
    地理学評論
    1951年 24 巻 10 号 337-343
    発行日: 1951/10/01
    公開日: 2008/12/24
    ジャーナル フリー
    It is generally believed that river piracy is a rare phenomenon in our mountainous country. In Jaapn, however, there are many upheaved peneplains where river piracy often occurs, and we have many examples of crustal movements which are the direct causes of river piracy. On account of these facts, various examples of river piracy are found in Japan, and these phenomena took place by way of surface streams and subterranean capture of surface streams, and faulting tilted block movement, tectonic line and selective erosion and so forth. In Japan, spill-overr is due mainly to volca-nic activity and river load. As regards regions, Chugoku and Abukuma districts attract our attention with their abundance of examples of river piracy and spill-over.
  • 関口 千穂
    第四紀研究
    2001年 40 巻 1 号 1-17
    発行日: 2001/02/01
    公開日: 2009/08/21
    ジャーナル フリー
    飯山盆地周辺山地における森林植生の変遷を明らかにするために,北ドブ湿原(標高1,550m),茶屋池湿原(標高1,100m),沼の原湿原(標高830m)においてボーリング調査を行い,得られた湿原堆積物について14C年代測定,テフラの同定,花粉分析を行った.笹ヶ峰(標高1,280m)では,露頭から採取した泥炭層の花粉分析を行った.湿原堆積物中には,多数の示標テフラが認められ,北ドブ湿原と沼の原湿原の堆積物は最終氷期の約18,000~17,000yrs BP以降,茶屋池湿原のそれは御岳潟町テフラ(On-Kt)が介在することから,最終氷期前半にさかのぼる堆積物であることが明らかになった.
    湿原堆積物と笹ヶ峰で採取した泥炭層の花粉分析結果から,飯山盆地周辺山地ではIB-I帯からIB-VI帯までの6地域花粉帯が設定される.本地域の植生変遷をこれらの地域花粉帯ごとにまとめると,IB-I帯:最終氷期前半の温帯性針葉樹と落葉広葉樹の混生する疎林期(約93,000~74,000yrs BP),IB-II帯:AT降下前の亜寒帯性針葉樹と落葉広葉樹の混生する疎林期(約26,000~25,000yrs BP),IB-III帯:最終氷期後半の亜寒帯性針葉樹とカバノキ属が混生する森林期(約18,000~14,000yrs BP),IB-IV帯:晩氷期のカバノキ属優占の落葉広葉樹林期(約14,000~10,000yrs BP),IB-V帯:後氷期の最温暖期を含むブナの優占する落葉広葉樹林期(約10,000~4,000yrs BP),IB-VI帯:ブナ優占の落葉広葉樹林が卓越するが,針葉樹林も生育地を拡大する時期(約4,000yrs BP以降)となる.
    飯山盆地周辺山地における約10,000yrs BP以降のブナの優占する落葉広葉樹林の発達は,ブナ林が急速に成立・拡大したことを示唆し,このブナ林の発達は,晩氷期以降に本地域が多雪地となったことに強く関連していると考えられる.
  • 石井 英也
    人文地理
    1977年 29 巻 1 号 1-25
    発行日: 1977/02/28
    公開日: 2009/04/28
    ジャーナル フリー
    Minshuku are cheap lodging houses or their management in a tourist resort. Most of them are usually operated by farmers and fishers as their side work. Minshuku has rapidly developed since about 1960 with the increase of recreational demands in Japan and minshuku regions have emerged here and there. Generally they were typical agricultural or fishing regions in less-developed areas in Japan. It is an urgent subject to clarify the conditions for the forming process of a minshuku region. The aim of this paper is to present the explanatory model of the forming process of a minshuku region by describing a representative one, in order to make clear where and on what conditions the minshuku region has been formed.
    Studies about minshuku are still few and requiring further systematic consideration for the studies. The author already wrote a paper which deals with the actual status of the development of minshuku in Japan. In this paper he made clear that the minshuku regions can be classified into those located at coastal bathing resorts and those located near skiing grounds. For that reason he examines here the forming process of a minshuku region, taking the case of Hakuba Mura, Nagano Prefecture, as a typical latter type.
    The results are summarized in Table 6.
    The period from about 1910 till world War 2 was the germinal stage for minshuku. In this period the region was primarily agricultural, for each household in this region made a living most by farming. But the agricultural productivity was very low in the case of most other snowy and cold highlands. Hence the farmers had necessarily to supplement their income by non-agricultural economic activities. Such state stimulated the emergence and development of minshuku with the spread of skiing and mountain climbing as sports, particularly since around 1930. Mountain slopes in this highland were generally wastelands or broad-leef woodlands, where the farmers were gathering grasses, straws and fuel woods. Such conditions could easily be used for making skiing grounds.
    The second stage was the period from World War 2 to about 1960. In this period the development of the region as a tourist resort got into its stride. After World War 2 the development of tourism such as the installation of ski lifts was made by the local capitals earlier than other similar regions, because Hakuba Mura was already well known as a tourist resort. It attracted the Tokyu capital of Tokyo, one of the greatest private railway companies and nation-wide tourist enterprises, which played later a large role in the development of Hakuba Mura. In these circumustances the farmers have made possible the development of minshuku by the best use of various regional conditions such as the presence of silkworm rearing rooms and stables or the low productive mountain slopes, which originated in the former economic activities. On the other hand, the techniques for rice growing have advanced and the compound management of minshuku with rice growing has been settled, because of the stability of producer price of rice and the better seasonal distribution of labour.
    The third stage was the period after 1961. In this period the capital investment for minshuku has been popularized and a result was differentiation of minshuku in respect to the scale of management. Various other tourist developments have also been made. Part of arable lands near the regional center have been converted to tourist facilities like parking places, sports grounds and so on by some of the minshuku which rely largely on minshuku rather than on agriculture. Many parts of wastelands and broad-leef woodlands were changed into skiing grounds and mountain cottage lands. For these developments much of the communal lands have been well utilized.
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