地理学評論
Online ISSN : 2185-1719
Print ISSN : 0016-7444
ISSN-L : 0016-7444
25 巻, 6 号
選択された号の論文の5件中1~5を表示しています
  • 關口 武
    1952 年 25 巻 6 号 p. 211-220
    発行日: 1952/06/01
    公開日: 2008/12/24
    ジャーナル フリー
    Snow and frost are remarkable weather phenomena of winter. But it is general that these phenomena do not occur at the same time at the same place. Therefore, we can detect two climatic regions according to such chara-cteristics of winter, i. e. snowy regions and frosty regions. Such divisions are also significant to research from an environmental point of view on climates, because snow and frost have also important roles on our daily lifes and productive activities. Using the observed number of snowy days and frosty days, we researched dates of arrivals, retreats and durations of winter at various places and which is a predominant phenomenon among snow and host at each locality.
    1) Frosty regions can be found at the Pacific Side of Japan and snowy regions are the Japan Sea Side.
    2) An arrival of frost is about November and its retreat is April almost at every place in Japan. And generally speaking snow comes in December and ends at March.
    3) Then at the Japan Sea Side, it is general that winter begins at December and ends at March both with snow. But at some places, it can be seen one or two months of frosty winter before and behind of these snowy months. (Cf. Tab.1)
    4) Larger parts of Hokkaido are snowy. Frosty places can be found only at southeastern parts. In this region, frost and snow also begin to fall at October and end at April. Therefore, winter durations become t ro months longer than other regions.
    5) At the Pacific Side, winter are comparatively longer than the Japan Sea Side. They continue from November to April. But at southern areas (Shikoku, Kyushu etc.), they are rather warmer and winter opens at December and closes at March. Especially at promontory of southern peninsulas, winter is very short. It is only one month. It begins at January and ends at that month.
    (3) Referring to the chi-square test, we considered that 3.8 days per month which have frost and snow respectively are significant as threshold values to recongnize an entrance or a retreat of winter.
    4) Regional reprecentativenesses of snowy and frosty days as climatic elements are larger at the Japan Sea Side and smaller at the Pacific Side.
  • 町田 貞, 井口 正男
    1952 年 25 巻 6 号 p. 221-229
    発行日: 1952/06/01
    公開日: 2008/12/24
    ジャーナル フリー
    Chichibu Basin is situated at the north-eastern part of Kanto-Mts. In this basin river terraces are distributed along the River Ara and River Akahira.
    We have researched the terrace deposits, especially size and angularity, sorting of terrace gavels, altitude and thickness of gravel beds, from which we have studied on the environment of deposition and the process of formation of terrace plains.
    The main subjects are summarized as follows: (1) Terrace plains in this basin are classified into. three groups.
    (2) Upper terrace gravels which form a divide between two rivers are fanglomerates of the River Ara and the upper terrace plain is a remnant of dissected fan.
    (3) Middle and lower terrace gravels which are found a long two rivers are deposits of old flood plains.
    (4) The thickest gravel deposit on each terrace is found at the southern part of Chichibu City, and it suggests relative subsidence of this region during each stage of terrace building, related to the earth movement of this basin.
  • 菊地 利夫
    1952 年 25 巻 6 号 p. 230-241
    発行日: 1952/06/01
    公開日: 2008/12/24
    ジャーナル フリー
    I. Shindens drained lakes and marshes were almost colonized in the early and middle stage of Edo Era. In the early stage, few marshy lands of lakes were drained by Kantoryu, rudimentery enbankment works. In the middle stage, many lakes and marshy lands which connected with the big rivers by the branch streams were changed into the new paddy fields by Kishuryu, the epoch-making embankment works. Shiunji Shinden was drained, which was remained as the reservoir of water by Kantoryu, when the river Kazi rose.
    2. The irrigation-drainage ways of Shiunji Shinden, as same as the other lake-drained Shinden consisted of the three parts:
    1) Mawashibori-arounded Shinden, drained the unnecessary water from the old paddy field.
    2) Naka-akusuiro-drained the unnecessary water of Shinden itself.
    3) Otoshibori-drained the unnecessary water from Mawashibori and Nakaakusuiro to the out of Shinden. Moreover lake-drained Shindenn by Kishuryu was added the three part:
    1) Shimekeri-dammed the branch stream connected with the main stream.
  • 貝塚 爽平
    1952 年 25 巻 6 号 p. 242-246
    発行日: 1952/06/01
    公開日: 2008/12/24
    ジャーナル フリー
    In this paper, the origin of asynmetrical river terrace of Dosi-gawa (river) hass been considered. From the shape of terrace and the distribution of terrace gravel, it is concluded that Doshi-gawa is an example of C. A. Cotton's “Valley-side superposition, ” and the lateral sliding of the trunk river on the ancient valley floor was caused by the pushing of fan-shape deposits of tributaries. And, the asynmetrical pressure of tributary deposits are derived from the difference of catchment areas and bights on both side sloes of the trunk river.
  • 1952 年 25 巻 6 号 p. 247-250_1
    発行日: 1952/06/01
    公開日: 2008/12/24
    ジャーナル フリー
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