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Case study of debris flow disaster scenario caused by torrential rain on Kiyomizu-dera, Kyoto, Japan - using Hyper KANAKO system

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Journal of Mountain Science 2016年第2期13卷 193-202页

作者： Kana NAKATANI Satoshi HAYAMI Yoshifumi SATOFUKA takahisa mizuyama Department of Erosion Control Engineering Kyoto University Kyoto 606-8502 Japan CTI Engineering Co. Ltd. Osaka 541-0045 Japan Department of Civil Engineering Ritsumeikan University Shiga 606-8502 Japan National Graduate Institute for Policy Studies Tokyo106-8677 Japan

This paper presents debris-flow numerical simulations using the Hyper KANAKO system,developed by the *** system uses the debris flow simulator KANAKO 2D equipped with a graphical user interface(GUI);hence,a user can easily produce appropriate landform data for simulations using standard laser profiler data,and visualize the results using a *** KANAKO was applied to the streams around Kiyomizu-dera in Kyoto,***-dera is a famous temple in Japan which is visited by numerous tourists throughout the *** simulated a disaster scenario of debris flow caused by torrential *** set the hydrograph using rainfall intensity data,and set the landform data using information from the Geospatial Information Authority of Japan(GSI) and a digital elevation model(DEM).We evaluated different mesh sizes and also used a digital surface model(DSM) to consider the building *** simulation results showed that with small mesh size,the debris flowmoved through the roads,which seems realistic for a disaster *** buildings were considered,the flow direction changed,and a 1-m flow depth,which was deeper than in other cases,appeared in the flow *** may pose a dangerous situation for evacuations.

关键词： Debris flow Simulation GIS Hyper KANAKO system Torrential rain Kiyomizu-dera

Hydraulic model tests for evaluating sediment control function with a grid-type Sabo dam in mountainous torrents

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International Journal of Sediment Research 2013年第4期28卷 511-522页

作者： Takahiro ITOH Shigeo HORIUCHI takahisa mizuyama Kazuhiko KAITSUKA NIPPON KOEI Co. Ltd Pasco Corporation Graduate School of Agriculture Kyoto University NIPPON KOEI Co. Ltd.

There are two kinds of Sabo dams in order to control sediment transport by debris flow and flash floods in mountainous area,which arc closed and open-type’s *** Japan,open-type’s Sabo dams are constructed taking into account the continuity of sediment routing from upstream to downstream reach in a basin.A plan to construct a 20 m high grid-type Sabo dam which can capture a sediment volume of 400,000 nr is proposed in the Amahata river basin in *** model tests are conducted to decide on the section for a dam(Section A,B) and the grid size such as clearance of vertical/horizontal bars for evaluating the *** runs of flume tests are conducted and the sediment control function of the Sabo dam is discussed using several experimental data such as dimensionlcss sediment runoff rate from Sabo dam,temporal changes of bed profile and mean diameter and so *** was found that sediment deposition in sediment storage area of Sabo dam was affected by curved channel,and that next the grid size of steel bars and thirdly the section of a dam was able to capture sediment in storage area of Sabo *** was controlled well in the section B and in the grid size of l.0×d95,and the problems related to sediment runoff after sediment capturing in Sabo dam are pointed out.

关键词： Hydraulic model tests Debris flow Grid-type Sabo dam Sediment storage

Hydraulic model tests for propagation of flow and sediment in floods due to breaking of a natural landslide dam during a mountainous torrent

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International Journal of Sediment Research 2018年第2期33卷 107-116页

作者： Takahiro Itoh Akihiko Ikeda Takahiko Nagayama takahisa mizuyama Research and Development Center Nippon Koei Co. Ltd Saboε Landslide Technical Center Hokuriku office Nippon Koei Co. Ltd National Graduate Institute for Policy Studies (GRIPS)

During mountain torrents, large-magnitude floods may result from heavy rainfall and cause the breakage of landslide dams naturally formed by heavy rainfall, earthquakes, and so on. The characteristics of longitudinal spreading of clear water discharge and changes in flow depth must be clarified because the changes in peak depth have not yet been examined in steep-slope torrents and because there are few data on spreading of flash floods and related sedimentation in mountainous torrents. In the present study, experimental data were collected through hydraulic model tests over a rigid bed, and the spreading of water, fine sediment, bed load, and large boulders due to flooding are discussed assuming that flash flooding/debris flows occur in the upstream reach. The effects of changes in flow width, such as expansions and contractions in the flow width, as well as changes in meandering channels, sediment transportation, and spreading flow depth resulting from bores are examined using flume data for a steepslope torrent. The data obtained in the present study reveal that fine sediment components are transported to the downstream reach if large-magnitude floods occur and that the spreading rate and peak lags of the fine sediment and water level indicate the occurrence of a flood in the upstream reach.

关键词： Propagation of water and sediment Debris flow Flash flood Hydraulic model tests Flow width

Influence of Housing and Urban Development on Debris Flow Flooding and Deposition

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Journal of Mountain Science 2013年第2期10卷 273-280页

作者： Kana NAKATANI Yuki OKUYAMA Yuji HASEGAWA Yoshifumi SATOFUKA takahisa mizuyama Graduate School of Agriculture Kyoto UniversityKitashirakawa Oiwake-choSakyo-kuKyoto City606-8502Japan National Institute for Land and Infrastructure Management AsahiTsukuba CityIbaraki305-0804Japan Civil Engineering Research Laboratory 904-1 TohigashiTsukuba CityIbaraki300-2633Japan Department of Civil Engineering Ritsumeikan University1-1-1 Noji-higashiKusatsu CityShiga525-8577Japan

Debris flows form deposits when they reach an alluvial fan until they eventually ***,houses located in the alluvial fan might affect the debris flow flooding and deposition *** previous studies have considered the effects of houses on debris flow flooding and *** study conducted model experiments and numerical simulations using the Kanako2D debris flow simulator to determine the influence of houses on debris flow flooding and *** model experiments showed that when houses are present,the debris flow spreads widely in the cross direction immediately upstream of the houses,especially when the flow discharge is large or the grain size is *** located in the alluvial fan also influence the deposition *** presence of houses led to flooding and deposition damage in some places and reduced the damage in *** simulation also demonstrated the influence of *** the model experiment and the simulation showed that houses change the flooding and deposition areas.

关键词： Debris flow Alluvial fan House Modelexperiment Numerical simulation

Development and installation of bedload monitoring systems with submerged load cells

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Journal of Mountain Science 2016年第2期13卷 369-376页

作者： Ken GOTO Takahiro ITOH Takahiko NAGAYAMA Rei UTSUNOMIYA Daizo TSUTSUMI takahisa mizuyama Research and Development Center Nippon Koei Co.Ltd.2304 InariharaTsukubaIbaraki 300-1259Japan Nippon Koei Co. Ltd.4-2 Koji-machiChiyodaTokyo 102-0083Japan JFE Advantech Go. Ltd.3-48 Takahata-choNishinomiyaHyogo 663-8202Japan Disaster Prevention Research Institute Kyoto University436-13 NakaoOkuhidaonsengoTakayamaGifu 506-1422Japan Graduate School of Agriculture Kyoto UniversityKitashirakawa Oiwake-choSakyoKyoto 606-8502Japan

Bedload governs riverbed channel variations and morphology, it is necessary to determine bedload discharge through an arbitrary cross section in a mountain fiver. A new system with submerged load cells has been developed to directly measure bedload discharge. The system consists of：（1） an iron box which is 1 m long, 0.5 m wide and 0.1 m in depth, （2） two submerged load cells 0.7 m apart, （3） a pressure sensor and, （4） an electromagnetic velocity meter. This system has been designed to exclude the effect of the hydraulic pressure of water on direct measurements of bedload particle weight. Initial tests in a laboratory were conducted to examine the accuracy of measurements with the system under aerial conditions. The system has been installed in the supercritical flume in Ashi-arai-dani River of the Hodaka Sedimentation Observatory of the Disaster Prevention Research Institute （DPRI） of Kyoto University to obtain bedload discharge under natural conditions. Flume tests were conducted in this channel by artificial supply of uniform sediment particles of several grain sizes. The average velocity of the sediment particles near the bed was estimated using cross-correlation functions for weight waves obtained by the two load cells, Bedload discharge calculations were based on time integration of the product of sediment velocity and sediment weight obtained by the two load cells. This study clarifies the reasons why bedload measurements are difficult, and provides some solutions using the monitoring systems with submerged load cells through the field measurements. Additionally, the applicability of bedload measurement with the submerged load cells is explained based on experimental artificial sediment supply data.

关键词： Bedload Submerged load cell Flume tests

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堰塞坝溃决及防范

水利水电技术 2008年第7期39卷 97-99页

作者： takahisa mizuyama Shigekiyo Tabata Toshio Mori Fumito Watanabe Kimio Inoue4 宋守度 Professor Division of Forest ScienceGraduate School of AgricultureKyoto University Kyoto 606-8502Japan Sabo Frontier Foundation Sabo-kaikanHirakawa-cho 2-7-4Chiyoda-kuTokyo 102-0093Japan Tateyama Sabo Office Ministry of LandInfrastructure and TransportJapan(at presentstays in Indonesia as a JICA expert) Nippon Koei Corp.Ltd.Koji-machi 5-4 ChiyodaTokyo 102-8539Japan

由暴雨、地震等引起的山体滑坡或泥石流堵塞山区河道形成堰塞湖和堰塞坝.所壅起的水量会淹没上游地区,且堰塞坝一旦溃决,所产生的洪峰将淹没下游地区.尽管阻止滑坡和堰塞坝的形成十分困难,但若有必要的信息资料可资利用的话,即可对溃坝... 详细信息

由暴雨、地震等引起的山体滑坡或泥石流堵塞山区河道形成堰塞湖和堰塞坝.所壅起的水量会淹没上游地区,且堰塞坝一旦溃决,所产生的洪峰将淹没下游地区.尽管阻止滑坡和堰塞坝的形成十分困难,但若有必要的信息资料可资利用的话,即可对溃坝及由此引发的洪水危害做出预测.

关键词：堰塞坝坝溃决水槽实验计算机模拟应对措施日本

A Simulating Experiment in the Process of Soil Erosion on Bare Land in ***

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Global Geology 2001年第2期6卷 200-207页

作者： ZHAO Wei, HU Ke, WANG Xikui (Department of Land and Resources, Jilin University, Changchun 130061, China) Akitsu KIMOTO and takahisa mizuyama (Laboratory of Erosion control, Department of Forestry, Graduate School of Agriculture, Kyoto University, Ky Department of Land and Resources Jilin University Changchun 130061 China Laboratory of Erosion control Department of Forestry Graduate School of Agriculture Kyoto University Kyoto 6068502 Japan

In order to understand the process of surface erosion and acquire basic data of conditions on hillslope without vegetation, a sprinkling experiment is conducted on a bare slope in *** in the central part of Japan. Based on the measurements of runoff, mean soil erosion depth, and sediment yield, etc., the results suggest the following characteristics in the process of surface erosion in the experimental area. (1) The occurrence of sediment discharge is interrupted; (2) Surface runoff is a saturated overland flow; (3) The mean soil erosion depth is thick compared with other areas in ***; (4) Sediment discharge process is detachment-limited.

关键词： Sediment yield, Runoff, Sediment discharge, Soil erosion depth, Sediment transport, Mt. Tanakami

A tree-shaped motion strategy for robustly executing robotic assembly tasks

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第12期11卷 986-991页

作者： Yusuke BOTA Hajime mizuyama Akio NODA Tatsuya NAGATANI Ken-ichi TANAKA Department of Mechanical Engineering and Science Kyoto University Yoshida-Honmachi Advanced Technology R&D Center Mitsubishi Electric Corporation 8-1-1Tsukaguchi-Honmachi

An assembly robot needs to be capable of executing an assembly task robustly under various *** attain this goal,we use a task sequence tree model originally proposed for manual *** model regards an assembly task under uncertainties as a transformation of the contact state *** concept may contain several contact states with probabilities but these are transformed through a series of task elements into the contact state concept having only the goal state at the *** transformed contact state concept can be classified according to the terminal condition of each task ***,the whole assembly task can be designed as a tree-shaped contingent strategy called a task sequence *** paper proposes a systematic approach for reconfiguring a task sequence tree model for application to a robotic assembly *** addition,by taking a 2D peg-in-hole insertion task to be performed by a robot equipped with a force sensor as an example,we confirm that the proposed approach can provide a robust motion strategy for the task and that the robot can actually execute the task robustly under bounded uncertainty according to the strategy.

关键词： Active compliant motion Contact states Motion strategy Robotic assembly Task sequence tree

IMPACT RESPONSE AND SAFETY CHECK OF STEEL PIPE CHECK DAM

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IMPACT RESPONSE AND SAFETY CHECK OF STEEL PIPE CHECK DAM