巻号一覧
65 巻 (2012)
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前身誌
65 巻, 4 号
選択された号の論文の14件中1～14を表示しています
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口絵〈災害報告〉
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久保田 哲也, 地頭薗 隆, 清水 収, 平川 泰之, 本田 健, 飯島 康夫, 泉山 寛明, 海堀 正博, 北原 哲郎, 小林 浩, 松本 ...2012 年 65 巻 4 号 p. 01-02
発行日: 2012/11/15
公開日: 2015/08/03
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口絵〈観測の現場を訪ねて－35〉
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阿部 俊夫, 山野井 克己, 溝口 康子2012 年 65 巻 4 号 p. 03-04
発行日: 2012/11/15
公開日: 2015/08/03
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論説
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執印 康裕2012 年 65 巻 4 号 p. 1-2
発行日: 2012/11/15
公開日: 2015/08/03
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論文
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林 真一郎, 水野 正樹, 小山内 信智, 西 真佐人, 清水 孝一, 中川 和男, 松本 定一2012 年 65 巻 4 号 p. 3-14
発行日: 2012/11/15
公開日: 2015/08/03
ジャーナル オープンアクセスSynthetic aperture radar（SAR）installed in an artificial satellite can observe ground conditions even at night and in bad weather conditions when disaster surveying by helicopters is difficult. Using SAR in the Japanese artificial satellite ALOS（Daichi）to detect landslides applies correlation coefficient difference analysis and NDPI（Normalized Difference Polarization Index）difference analysis to the area damaged by the Iwate-Miyagi inland earthquake（Iwate-Miyagi）and sediment-related disasters caused by heavy rain in Hofu city, Yamaguchi Pref.（Yamaguchi disaster）. The results are summarized as follows. The analysis methods have almost identical landslide detection capability. Both analysis methods can detect landslides with size over 10,000 m2 with above 60％accuracy, and over 40,000 m2 with above 80％ accuracy. There may be a minimum detectable landslide size. The size of the Iwate-Miyagi is 900 m2 and Yamaguchi disaster is 2,500 m2. In all analyzed views of SAR satellite images, detection accuracy was better in the Iwate-Miyagi case than the Yamaguchi disaster case. Landslide size is a more effective determinant of capability to detect landslides than slope gradient. The smaller a landslide's size, the more effective slope direction is as a determinant of landslide detection difficulty.抄録全体を表示PDF形式でダウンロード (4829K)
報文
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中谷 加奈, 奥山 悠木, 長谷川 祐治, 里深 好文, 水山 高久2012 年 65 巻 4 号 p. 15-23
発行日: 2012/11/15
公開日: 2015/08/03
ジャーナル オープンアクセスDebris flow stops and deposits when it reaches an alluvial fan. There are often many houses on the fan, and they seem to influence the debris flow flooding and deposition process. In this study, we conducted model experiments and numerical simulations with a debris flow simulator Kanako2D, in order to confirm the influence of houses. The model experiments results show that when there are houses, debris flow spreads widely in the cross direction just upstream of the houses, especially when the flow discharge is large or the grain size is small. The houses influence is shown in the simulation, too. We also considered houses destruction in the simulation with simplified method using fluid force. When some houses are destroyed by debris flow, the deposition conditions change from that when the houses are not destroyed. Debris flow grain size and peak discharge have an effect on houses destruction.抄録全体を表示PDF形式でダウンロード (6055K) -
林 拙郎, 内田 芳貴, 櫻本 智美, 沼本 晋也2012 年 65 巻 4 号 p. 24-31
発行日: 2012/11/15
公開日: 2015/08/03
ジャーナル オープンアクセスIn Mie and Fukui prefectures, many slope failures occurred in the forest slopes caused by heavy rainfall in 2004. The influence of standing trees for failed sediment was discussed. Study sites were located in former Miyagawa village in Mie prefecture and Miyama town in Fukui prefecture. The depth and width of slope failures, sedimentation stopped by the standing trees or flowing down through the stands were investigated by field surveys in each forest slope. In the case of slope failures of smaller than a 10 meter width, the ratio of slope failure areas were high at the younger stands, around 5 to 15 years old, for both sites. Also, the relationship between slope width and slope depth was found as follows. In the case of sedimentation, when the slope failures were small, the diameter at breast height of standing trees was large. When the slope failures were large, the diameter at breast height of standing trees was small in case of flowing down. The data of both cases were classified by discriminant analysis using factors of the diameter at breast height and slope failure depth.抄録全体を表示PDF形式でダウンロード (3872K)
研究ノート
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宮前 崇, 平松 晋也2012 年 65 巻 4 号 p. 32-38
発行日: 2012/11/15
公開日: 2015/08/03
ジャーナル オープンアクセスHydrologic properties in soil layer are determined by various kinds of heterogeneities (for example soil pipes, cracks,cobbles and forest roots etc.). And these heterogeneities give large influences to hydrologic processes in soil layer. Therefore, it is important to estimate accurately effects that heterogeneities give for water movement in soil layer. Nevertheless, few studies concerned with these phenomena, without soil pipes study. In this study, on hydrologic processes, that is, the movement of water in soil layer, in order to understand effects of forest roots (living-root and decayed-root) which are a portion in primary factor to make soil layer structure heterogeneous, laboratory flume experiment using a simplified form pseudo roots was carried out. The following matters were confirmed by this experiment.
1) Forest roots in soil layer increased runoff in a steady state.
2) Permeability of the entire flume is increased by presence of forest roots, when slope is at
least 20°.
3) The hydraulic property around forest roots is represented in the similar to Manning law.抄録全体を表示PDF形式でダウンロード (1917K) -
宮前 崇, 渡海 勇輝, 平松 晋也2012 年 65 巻 4 号 p. 39-44
発行日: 2012/11/15
公開日: 2015/08/03
ジャーナル オープンアクセスHydrological properties of soil layer are determined by various kinds of heterogeneities, and these heterogeneities give large influences to hydrological processes in the soil layer. Of these heterogeneities components present in the forest soil, this study focused on the common and abundant forest roots, as intended to quantitatively assess the influence its presence on the movement of rainwater in soil layer, vertical infiltration experiment using a pseudo roots was carried out. As a result, the presence of forest roots significantly affects behavior of rainwater in soil layer was revealed, such as, reduced the startup time of groundwater runoff and increased the amount of groundwater runoff. In addition, the startup time of groundwater runoff and the amount of groundwater runoff were able to approximate by using circumferential length of pseudo roots and sprinkling intensity, were confirmed.抄録全体を表示PDF形式でダウンロード (2270K)
技術ノート
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横田 浩, 吉田 圭佐, 古山 利也, 判田 乾一2012 年 65 巻 4 号 p. 45-49
発行日: 2012/11/15
公開日: 2015/08/03
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災害報告
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久保田 哲也, 地頭薗 隆, 清水 収, 平川 泰之, 本田 健, 飯島 康夫, 海堀 正博, 北原 哲郎, 小林 浩, 松本 俊雄, 松尾 ...2012 年 65 巻 4 号 p. 50-61
発行日: 2012/11/15
公開日: 2015/08/03
ジャーナル オープンアクセスWe had a deluge in July 2012 in the northern Kyushu district with intense rainfall of 800 mm and 108 mm/hr. This intensity yielded countless traces of debris flow and slope failures that induced tremendous damage and causalities in the area. Hence, several field investigations and reconnaissance tasks were conducted by the society to delve into this sediment-related disaster. The various results and the information obtained through this investigation were reported as the primary report, mentioning the damage, geologic-geomorphologic features and hydraulic characteristics of the debris flows, vegetation effects, and the efficiency of Sabo facilities in other scenes of this disaster.抄録全体を表示PDF形式でダウンロード (7808K)
現場情報コーナー
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松本 静男, 平山 勝彦, 向山 正純, 鷲尾 洋一2012 年 65 巻 4 号 p. 62-67
発行日: 2012/11/15
公開日: 2015/08/03
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観測の現場を訪ねて－35
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阿部 俊夫, 山野井 克己, 溝口 康子2012 年 65 巻 4 号 p. 68-71
発行日: 2012/11/15
公開日: 2015/08/03
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報告
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堀田 紀文, 朱 培紅2012 年 65 巻 4 号 p. 72
発行日: 2012/11/15
公開日: 2015/08/03
ジャーナル オープンアクセスPDF形式でダウンロード (716K)
新刊紹介
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清水 収2012 年 65 巻 4 号 p. 73
発行日: 2012/11/15
公開日: 2015/08/03
ジャーナル オープンアクセスPDF形式でダウンロード (658K)
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