砂防学会誌
Online ISSN : 2187-4654
Print ISSN : 0286-8385
ISSN-L : 0286-8385
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67 巻, 4 号
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口絵〈災害報告〉
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  • 平成25年10月伊豆大島豪雨災害における土砂流下範囲と被害発生時刻
    秋山 怜子, 石塚 忠範, 吉永 子規, 水谷 佑, 森田 耕司
    2014 年 67 巻 4 号 p. 3-12
    発行日: 2014/11/15
    公開日: 2016/12/01
    DOIhttps://doi.org/10.11475/sabo.67.4_3
    ジャーナル フリー
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    This article is intended to clarify the inundated area and the time of the debris flows triggered by large-scale shallow landslides in Izu Oshima Island on 16 October, 2013. A large number of shallow landslides occurred on slopes consisting of the volcanic sediment, and debris flows which contain fine particles such as volcanic ash flooded down wide area. In addition, it is characterized that debris flows traveled over a small ridge and widened the damaged area because of the undeveloped topography. It is important to analyze the situation of debris flow disaster peculiar to a volcanic area for the countermeasures in other similar areas. First, we conducted field investigation to designate the inundation area in detail, such as measuring the height of flood mark on a wall of houses. Next, interviews to municipal officials, fire authorities and inhabitants were carried out to clarify when the debris flow damage occurred in each districts. As a result, the inundation area of the debris flows was widespread from upstream to the shore, and the sedimentation more than one meter depth was mostly around the vicinity of Okanesawa stream. In the other area nearer the sea, sedimentation was equal or less than 50 cm depth. As a result of interviews, damages occurred 2 : 20-2 : 30 in Kandatsu district that is most upper area and it occurred about 2 : 30-3 : 00 in the middle stream area. It is suggested that four times of surge flow hit the area around Motomachi Bridge in the downstream around 3 : 00 and 3 : 30. We concluded that the damaged area widened from Kandatsu district where the first event occurred to the downstream area sequentially during one to two hours.
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  • 河道閉塞の緊急対策として最適な仮排水路の計画について
    桜井 亘, 酒井 良, 後藤 彦幸, 梶原 修, 下野 公仁, 江口 健治, 森田 真幸, 荒川 淳二, 大塚 康之
    2014 年 67 巻 4 号 p. 23-30
    発行日: 2014/11/15
    公開日: 2016/12/01
    DOIhttps://doi.org/10.11475/sabo.67.4_23
    ジャーナル フリー
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  • 天然ダムの水位予測に漏水量が与える影響
    秋山 怜子, 藤村 直樹, 石塚 忠範, 内田 太郎, 桜井 亘, 酒井 良, 海原 荘一, 只熊 典子
    2014 年 67 巻 4 号 p. 31-37
    発行日: 2014/11/15
    公開日: 2016/12/01
    DOIhttps://doi.org/10.11475/sabo.67.4_31
    ジャーナル フリー
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    In this article, we proposed an indirect method of measuring seepage of natural dam and considered the effect of seepage on prediction of water level in natural dam. It is one of the most important subjects to predict overtopping time of natural dam. It has not been obvious whether pondage depends on seepage in natural dam reservoir, because monitoring of inflow and seepage is difficult in natural river bed. First, we estimated seepage volume of natural dam with hydrological data. Second, we back-calculated inflow volume. The data was observed around a natural dam in Nagatono Valley in Kii Peninsula, from Sep. 2012 to March 2014. In our proposed method, it was assumed that seepage was followed Darcy's law. We compared observed inflow with back-calculated inflow by the saturated hydraulic conductivity, and obtained the same results. Using the back-calculated inflow, it clarified that 30-90% of inflow volume leaked from a natural dam, and 30-70% of seepage is observed as spring water from lower of the natural dam during rainfall period and 24 hours after stopping rainfall. The existence of substantial seepage in this natural dam shows necessity of consider in prediction of water level in natural dam.
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