砂防学会誌

別荘住民とハザードマップ

鈴木勇二

2003 年 56 巻 1 号 p. 1-2
発行日: 2003/05/15
公開日: 2010/04/30

DOIhttps://doi.org/10.11475/sabo1973.56.1

ジャーナルフリー

PDF形式でダウンロード (2434K)
斜路式魚道における粗石の配置について

宮園正敏, 戸松修

2003 年 56 巻 1 号 p. 3-12
発行日: 2003/05/15
公開日: 2010/04/30

DOIhttps://doi.org/10.11475/sabo1973.56.3

ジャーナルフリー

抄録を表示する抄録を非表示にする

During a heavy downpour, runoff fluctuates rapidly in the upstream and allows a lot of sediments, woody debris and other suspended load to be transported and deposited. Therefore it is important that sediment deposition does not occur in fishways. To find an appropriate solution to this problem, a suitable fishway known as the protruding boulder type fishway was designed. The authors tried to investigate the characteristics of this type of fishway through a hydraulic model experiment and the fish release test. The purpose of the hydraulic model experiment was to verify whether boulders could reduce flow velocity while the essence of the fish release test was to observe the behavior of fishes around the boulders. The experiment revealed the following findings: 1) Flow in the channel accelerated without the boulders, so the function of the boulders was to decelerate flow. 2) There were two types of flow. One occurred as the boulders were submerging, while the other occurred as the boulders were emerging from the stream. In the case where the boulders sank, the velocity of flow was fast. For the fishes to ascend the cannel, the mean velocity must be below the cruising speed. To satisfy this, the slope of the channel should be less than 2%. 3) In the case where the boulders rise to the surface, it partially dams up the upstream flow. When the spaces between the boulders (arranged along the width of the channel) are narrow, the water surface becomes level and appears as steps. To maintain sanctuaries for fishes, it is necessary that the longitudinal distances between the boulders are widened and lateral distances narrowed.

抄録全体を表示

PDF形式でダウンロード (13037K)
花崗岩山地一次谷流域の流出現象に及ぼす岩盤地下水の影響

宮田秀介, 内田太郎, 浅野友子, 安藤宏幸, 水山高久

2003 年 56 巻 1 号 p. 13-19
発行日: 2003/05/15
公開日: 2010/04/30

DOIhttps://doi.org/10.11475/sabo1973.56.13

ジャーナルフリー

抄録を表示する抄録を非表示にする

To evaluate the contribution of bedrock groundwater seepage to stormflow generation in a granitic headwater catchment, runoff and water chemistry of springs and streamflow were observed simultaneously at a headwater catchment, Ibi, central Japan. In the catchment covered with a natural closed forest, there were about 20 springs along the first-order stream, one from soil-bedrock interface, and the other from cracks in the bedrock. Hydrologic and hydrochemical observation indicates that bedrock springs at the catchment can be divided into two types; relatively responsive to rainfall, and low SiO₂ concentration and EC (“Type A”) ; little runoff fluctuation and relatively high SiO₂ concentration and EC (“Type B”). The SiO₂ concentration indicated the source of “Type A” spring was shallower than “Type B”. Hydrologic observation indicates that the runoff from soil-bedrock interface is dominant to rapid and large peak runoff that coincided with the rainfall peak (45mm, 110mm). However on the heaviest rain event (287mm), bedrock groundwater seepage is dominant to delayed and large peak discharge. This peak flow was three times greater than the initial peak flow, which was conjunction with the peak of subsurface storm flow.

抄録全体を表示

PDF形式でダウンロード (10470K)
2001年8月21日に和歌山県東の川で発生した土石流における樹林帯の土石流制御効果

芝嵜茂, 松本司, 海原荘一, 伊藤統博, 水山高久

2003 年 56 巻 1 号 p. 20-24
発行日: 2003/05/15
公開日: 2010/04/30

DOIhttps://doi.org/10.11475/sabo1973.56.20

ジャーナルフリー

抄録を表示する抄録を非表示にする

A debris flow due to typhoon No. 11 occurred at Higashinokawa river basin of Wakayama Prefecture southern part in 2001. Debris flow was trapped and the expansion of the overflowing debris flow was controlled by the trees in debris flow deposit area. The form of the trapping of debris flow by the tree is divided into two types. One is that boulders are trapped by boulders interlocking each other between the trees (type 1). The other is that boulders are trapped by boulders by log crosspieces due to splintered trees and fallen trees (type 2). To control overflowing of debris flow in this basin, It was found out that 30m of average forest length along stream line was necessary.

抄録全体を表示

PDF形式でダウンロード (9926K)
木製流路工の植生導入効果と腐朽度評価

谷口義信, 清水牧

2003 年 56 巻 1 号 p. 25-30
発行日: 2003/05/15
公開日: 2010/04/30

DOIhttps://doi.org/10.11475/sabo1973.56.25

ジャーナルフリー

PDF形式でダウンロード (9498K)
パインアップル圃場における赤土砂対策手法について

南哲行, 桜井亘, 山田孝, 徳永敏朗, 冨坂峰人

2003 年 56 巻 1 号 p. 31-36
発行日: 2003/05/15
公開日: 2010/04/30

DOIhttps://doi.org/10.11475/sabo1973.56.31

ジャーナルフリー

PDF形式でダウンロード (8862K)
大火から蘇った森林

江田島町における22年間の取り組み

寺田一之, 水谷嘉孝

2003 年 56 巻 1 号 p. 37-44
発行日: 2003/05/15
公開日: 2010/04/30

DOIhttps://doi.org/10.11475/sabo1973.56.37

ジャーナルフリー

PDF形式でダウンロード (17609K)
韓国における土砂災害と対策の現状

全槿雨

2003 年 56 巻 1 号 p. 45-53_2
発行日: 2003/05/15
公開日: 2010/04/30

DOIhttps://doi.org/10.11475/sabo1973.56.45

ジャーナルフリー

PDF形式でダウンロード (19616K)
平成14年度砂防学会ワークショップ (若手研究助成)

「源頭部森林流域における浮遊土砂及び浮遊有機物の流出特性に関する流域問比較」

芳賀弘和

2003 年 56 巻 1 号 p. 54-55
発行日: 2003/05/15
公開日: 2010/04/30

DOIhttps://doi.org/10.11475/sabo1973.56.54

ジャーナルフリー

PDF形式でダウンロード (314K)
平成14年度砂防学会ワークショップ成果概要報告

土砂災害・土砂流出に対する岩盤地下水の役割に関する研究

八反地剛

2003 年 56 巻 1 号 p. 56-57
発行日: 2003/05/15
公開日: 2010/04/30

DOIhttps://doi.org/10.11475/sabo1973.56.56

ジャーナルフリー

PDF形式でダウンロード (253K)

J-STAGEへの登録はこちら（無料）