著者

森 俊勇 井上 公夫 水山 高久 植野 利康

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.60, no.3, pp.44-49, 2007-09-15 (Released:2010-04-30)

参考文献数

21

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As many as 19 landslide dams have been formed in the northern region of Nagano prefecture, central Japan, in last 500 years except one case. Of this number, seven were formed when the Zenkoji Earthquake occurred in 1847. This abundance is likely because of the geotectonic background of this area which is located at the western end of the “Fossa Magna, ” or Japan's central graben belt.The Tobata landslide occurred in the early morning of June 24, 1757 due to heavy rain. Blocking the Azusa River, which is upstream of the Shinano River, a landslide dam with a height of 130 m and a storage capacity of 85 million m3 was formed. Around 10 a.m. on the third day (54 hours later), this landslide dam burst and its water flooded the area up to the confluence with the Narai River. According to calculation using the Manning's formula, it is estimated that the flood water ran down the river in a concentrated path with a velocity of 12 m/s and a peak flow of 27, 000 m3/s.When the dam burst, local people were quickly ordered to evacuate and no casualties were caused during this flood.

著者

井良沢 道也 石川 芳治 水山 高久 本間 久枝

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.44, no.6, pp.12-20, 1992-03-15 (Released:2010-04-30)

参考文献数

8

被引用文献数

4

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As comfortable lives are demanded nowadays, we begin to take an interest in near mountain torrents. It seems that constructing sabo facilities in such a mountain torrent affect migratory fishes.So we investigated fish ladders on sabo facilities in the whole country by questionnaire. As a result of the investigation, some questions and consideration of fish ladders become clear. We consider the rate of satisfaction for fish ladders, but it is difficult to propose the best structure of fish ladders on account of a lack of examples.We intend to examine fish ladders where fishes can go upstream easily in consideration of the sediment runoff and hydraulic condition of mountain torrents where sabo facilities are built. And we make another attempt to investigate not only fish ladders but also means of environmental preparation which is comfortable for fishes in whole watershed.

著者

戸松 修 岩本 航

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.54, no.6, pp.35-38, 2002-03-15 (Released:2010-04-30)

参考文献数

7

著者

宮田 秀介 藤田 正治 堤 大三 市田 児太朗

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.66, no.5, pp.92-95, 2014-01-15 (Released:2015-11-30)

参考文献数

6

著者

大井 英臣 檜垣 大助 八木 浩司 臼杵 伸浩 吉野 弘祐

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.65, no.3, pp.56-59, 2012-09-15 (Released:2015-08-03)

参考文献数

1

被引用文献数

1

著者

杉本 利英 野崎 保 酒井 英男

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.66, no.1, pp.23-29, 2013-05-15 (Released:2015-11-30)

参考文献数

15

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The air-borne magnetic surveys are reported to determine the distribution of susceptible layers to landslide in the southwestern Toyama, including the boundary between the Hida belt and the green tuff region. The results show the strong magnetic anomaly for the igneous rocks but the weak magnetic anomaly for the hydrothermal alternation zone or thick colluvial deposits that are susceptible to landslide, and therefore determine the landslide areas in the Funatsu granitic rocks and the colluvial deposits in the Neogene formations. Further, there is a strong positive correlation between the boundary of the anomalies and the group of faults that divide granitic rocks and Neogene formation in the area. The air-borne magnetic survey is not affected by small variation such as intrusive rocks due to its relatively low resolution of less than several meters, suggesting that this technique could be a powerful tool for the first screening survey for the susceptible layers to landslide, although the magnetic properties of the regional rocks have to be clarified in advance.

著者

浅井 涌太郎 水山 高久 三井 宏人 下東 久巳 工藤 賢二

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.39, no.3, pp.20-23_2, 1986-09-20 (Released:2010-04-30)

参考文献数

2

著者

伏谷 伊一

出版者

公益社団法人 砂防学会

雑誌

新砂防 (ISSN:02868385)

巻号頁・発行日

vol.25, no.3, pp.1-2, 1973-01-20 (Released:2010-04-30)

著者

大野 亮一 鈴木 雅一 太田 猛彦

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.51, no.4, pp.3-10, 1998-11-15 (Released:2010-04-30)

参考文献数

18

被引用文献数

3

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Prediction of ground water movement is very important and critical to forecasting slope failure because many slope failures are triggered by the surcharge of water weight and drop of suction when precipitation infiltrates into soils. It is necessary to consider both saturated and unsaturated flow phases, particularly for sequentially estimating ground water flow to specify the time and location of the failure.Richards' equation has strong nonlinearity of coefficients. As a result, its numerical analysis tends to be much more difficult than that under moderate conditions, especially with very dry soils or a perched water table. Recently, new methods to solve Richards' equation that focused on diminishing water balance errors and less limitation of time step size were presented (Celia 1990, Pan 1995). In this paper, those new methods are first introduced with explanation of their algorithms specified for balance errors or time step size. Second, based on the fact that both steady and unsteady phases are combined in Richards' equation, the consequent oscillation problem is demonstrated and examined. The algorithm of the oscillation is explained with the analytic method presented in this paper.

著者

斎藤 昇

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.41, no.4, pp.33-34_2, 1988-11-25 (Released:2010-04-30)

著者

市ノ瀬 榮彦

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.50, no.6, pp.77-81_2, 1998-03-15 (Released:2010-04-30)

参考文献数

7

著者

今森 直紀

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.74, no.2, pp.50, 2021-07-15 (Released:2022-07-15)

著者

孫 金勝 石川 芳治 白木 克繁 若原 妙子 内山 佳美

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.73, no.1, pp.15-24, 2020-05-15 (Released:2021-05-17)

参考文献数

30

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This study elucidates effects of various conservation works on soil erosion at the Dodaira beech forest of the Tanzawa Mountains using USLE, where forest floor vegetation has declined because of deer feeding. We applied soil erosion prevention work of four types: untreated (control), wooden horizontal step, coconut fiber net cover, and bamboo fiber net cover. Then we observed soil erosion amounts for 10-11 years. During the first year of soil erosion prevention work, the soil erosion amount in the treated plots was less than in the control plots. Although the vegetation was restored, litter had accumulated. Soil erosion was reduced at the control plots that had been installed outside of the vegetation protection fence. The effects of soil erosion reduction reached their limit after 10-11 years. The increased forest floor coverage led to reduction of soil erosion inside of the vegetation protection fence, even for the control plots. At the wooden horizontal step works, the soil erosion increased in the final year at the outside of the protection fence despite of the recovery of vegetation. Results show that the soil erosion amount at the wooden horizontal step works can be larger than that expected from the effects of vegetation coverage restoration. Soil erosion amounts during the last year for coconut and bamboo fiber net covering works installed at the steep slope of the outside of the protection fence surpassed those measured during the first year. This fact illustrates the time limitations of the effects of the coconut and bamboo fiber net. It also suggests that the coconut and bamboo fiber cover works installed at the steeper slope of the inside of the protection fence or at the gentle slope have reduced soil erosion for more than 10 years.

著者

Laurentia DHANIO Takahisa MIZUYAMA Ken'ichirou KOSUGI Agnes RAMPISELA

出版者

Japan Society of Erosion Control Engineering

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.61, no.4, pp.32-38, 2008-11-15 (Released:2013-09-02)

参考文献数

8

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The collapse of caldera walls of Mt. Bawakaraeng on 26th of March 2004 in South Sulawesi is one of the largest mass movements in the history of Indonesia. The collapsed material, calculated at approximately 232 million m3, covers 8 km of the upstream part of Jeneberang River. The main purpose of this research is to evaluate the magnitude of the impact on the change of basin and how the impact decreases over time. A given amount of rainfall produces less discharge after the collapse and peak flows which normally occurred in the months of January are now found in the months of March. Before the collapse, every daily amount of rainfall corresponds to 0.6 value of daily discharge, though in 2006, it decreased to 0.45. Daily discharges are mostly low flows (less than 5 mm/day) except in the year of the collapse (2004). After the collapse, medium flows occurred more frequently and high flows (flow of over 90 mm/day) occurred in less frequency and lower values. Analysis of turbidity and discharge relationship at Bili-bili Dam located 31 km downstream of the collapse may be applied to understand the sediment exhaustion and the basin's potential rates of recovery. Bili-bili Dam's maximum turbidity rate increased significantly from 407 Nephelometric Turbidity Units (NTU) to 125,159 NTU after the collapse and turbidity's respond to discharge alters after the collapse. Peak turbidity rates normally fall faster than the discharge falling limb ; nonetheless after the collapse, both values fall by approximately 50% daily.

著者

高橋 保

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.45, no.3, pp.38-44, 1992-09-15 (Released:2010-04-30)

参考文献数

14

著者

村上 正人

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.71, no.6, pp.59-63, 2019-03-15 (Released:2020-03-16)

参考文献数

5

被引用文献数

1

著者

久保田 哲也

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.48, no.1, pp.3-11, 1995-05-15 (Released:2010-04-30)

参考文献数

13

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Since most Sabo facilities like check dams and channel works are more or less at the site of natural beauty, planning and design of environmental free facility is coming very important recent years. Under this condition, landscape planning is adopted in many cases especially for the ones at national park. In order to accomplish landscape planning that has the aim of natural landscape conservation, however, consideration on “sensescape” including “smellscape” as well as “soundscape” is needed. In mountatinous area in which Sabo Works are necessary, smellscape is mainly consists of forest fragrance. Hence, to conserve the smellscape is simply conserve or restore the forest around the facilities. On the other hand, to conserved soundscape means design of falling water sound or sound of the flow over them.In this study, the focus is put on this soundscape, and its basic characteristics is studied here using sound power spectrum analysis. And the results insist that Sabo facilities have less “bland soundscape” than natural falls or torrents which have sound characteristic abounds in high frequency as well as 1/f fluctuation in their power spectrum, whereas stone made Sabo dams have bland sound similar to the natural ones.Therefore the basic data for soundscape design of Sabo facilities for “bland soundscape” are gained in this study.

著者

吉野 弘祐 内田 太郎

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.71, no.4, pp.13-19, 2018-11-15 (Released:2019-11-15)

参考文献数

22

被引用文献数

1

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Typhoon Talas (T 1112) induced many rapid, deep-seated landslides in the Kii Peninsula. Previous studies have examined the role that geology and geological structure play within the occurrence of these rapid, deep-seated landslides. However, there is no single, widely used physical model to describe deep-seated rapid landslides. Thus, we propose a physically based model that describes the widening process in water channels that accompanies overtopping erosion during landslide dams. In the model, we assumed that channel widening was induced by the collapse of side slopes due to channel bed degradation. We used slope stability analysis to describe side-slope collapse. Additionally, we considered whether our model could describe valley development processes during deep-seated landslides due to overtopping erosion of landslide dams. This was included because both side-slope collapse and deep-seated landslides could be affected by a decrease in slope stability with slope height and angle. Thus, we examined whether our proposed model could be used to model overtopping erosion of landslide dams, to determine the location and area of deep-seated landslides. This study focused on slopes where Typhoon Talas caused deep-seated landslides ; we used detailed topological data (LiDAR) before and after Typhoon Talas to measure slope gradients and relative heights, to evaluate the applicability of our model.

著者

海堀 正博

出版者

Japan Society of Erosion Control Engineering

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.51, no.5, pp.78-81, 1999

著者

建設省北陸地方建設局黒部工事事務所

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.48, no.5, pp.33-38, 1996-01-15 (Released:2010-04-30)

被引用文献数

1