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Watanabe Y.,Kitami Institute of Technology | Sumitomo K.,Docon Co. | Yamaguchi S.,Japan Civil Engineering Research Institute for Cold Region | Yokohama H.,Hokkaido Regional Development Bureau
River Sedimentation - Proceedings of the 13th International Symposium on River Sedimentation, ISRS 2016 | Year: 2017

The Japanese government conducts an artificial flood by dam discharge for the purpose of preservation of river environment at the Satsunai river from 2012. This research was conducted using numerical simulation (iRIC Nays2D4.2) for the purpose of understanding quantitatively the effect of the artificial flood to river channel disturbance. It was evaluated quantitatively that artificial flood is effective in maintenance of anabranches. Moreover, it was found quantitatively that the effect of mainstream alternation at bifurcations during a large flood which is expected by the maintenance of distributaries. © 2017 Taylor & Francis Group, London.

Hayashi H.,Japan Civil Engineering Research Institute for Cold Region | Nishimoto S.,Japan Civil Engineering Research Institute for Cold Region | Yamanashi T.,Hokkaido Regional Development Bureau
Soils and Foundations | Year: 2016

This paper describes the applicability of a method, proposed by Noto (1991a), to the prediction of the settlement of a peaty ground from an engineering viewpoint. The settlement of peaty grounds cannot be fully explained by Terzaghi's theory. Noto proposed a method for predicting the settlement behavior in peaty grounds on the basis of the statistical analyses of numerous oedometer test results. For the purpose of verifying the applicability of the Noto method, data on the settlement of full-scale test embankments, built in Hokkaido, Japan, were compared with predictions obtained by this method. The comparison quantitatively revealed the primary consolidation rate and the coefficient of secondary consolidation of the peaty ground as well as the prediction accuracy of the Noto method. © 2016 Japanese Geotechnical Society.

Takahashi N.,Japan Civil Engineering Research Institute for Cold Region | Tokunaga R.A.,Japan Civil Engineering Research Institute for Cold Region | Hatamoto A.,Hokkaido Regional Development Bureau | Tamaki H.,Hokkaido Regional Development Bureau
17th ITS World Congress | Year: 2010

Hokkaido, the northernmost island of Japan, is characterized by cold, snowy winters during which road maintenance is particularly essential in supporting economic activities and everyday life. In light of recent severe financial constraints, there is a need to further improve the appropriateness and efficiency of winter road maintenance in order to ensure safe, convenient driving conditions. To facilitate prudent decisions on winter road maintenance, a decision support system using a geographic information system (GIS) has been created to transmit information to road administrators. It consists of a forecast system that predicts changes in weather and road surface conditions and a monitoring system that observes road surface friction and evaluates the effects of winter road maintenance measures. This paper describes the conceptual framework of the system and outlines the status of a related project.

Munehiro K.,Japan Civil Engineering Research Institute for Cold Region | Kageyama H.,Traffic Engineering Research Team | Takahashi N.,Traffic Engineering Research Team | Watanabe M.,Traffic Engineering Research Team | And 2 more authors.
19th Intelligent Transport Systems World Congress, ITS 2012 | Year: 2012

Traffic smoothness must be ensured through winter road management. The average travel speed is an index of traffic smoothness. In this study, we used taxi probe data to obtain average travel speeds in the Sapporo urban area for a year, and analyzed the relationship between the average travel speed and various winter weather and road surface conditions. Also, we calculated the monetary value of the increase in average travel speed afforded by snow and ice control operations. We had acquired taxi probe data 365 days from April 1st, 2007 to March 31st, 2008, with the cooperation of a taxi company. Differences in average travel speed between the winter season and the non-winter season have been found to vary depending on weather and road surface conditions. Our survey has found that snow and ice control operations increase the average travel speed of road users. Improved average travel speed increases the benefit of the road for road users. Our cost-benefit analysis of snow and ice control operations for national highways in Sapporo found that the estimated benefit of snow and ice control operations exceeded the cost of such operations.

Takahashi N.,Japan Civil Engineering Research Institute for Cold Region | Kiriishi M.,Japan Civil Engineering Research Institute for Cold Region | Tokunaga R.,Japan Civil Engineering Research Institute for Cold Region | Kamiyama S.,Hokkaido Regional Development Bureau
19th Intelligent Transport Systems World Congress, ITS 2012 | Year: 2012

In cold and snowy regions, winter weather poses a significant hazard to road transportation. Winter Road maintenance is essential to provide a safe road surface for the driving public. In Hokkaido, the northernmost major island of Japan, skidding accidents account for 90% of the winter-type traffic accidents. Therefore, measures against icy road surfaces play a very important part of winter maintenance. In order to carry out these measures appropriately, it is necessary for maintenance staff to understand the spatial changes in road surface conditions and to share that information promptly. Aimed at solving these issues, Road Surface Friction Monitoring System has been developed by taking advantage of ITS technology. The core of the system is a Continuous Friction Tester (CFT). With the ability to measure road surface friction continuously, CFT makes it possible to understand spatial changes in road surface conditions in detail. The data obtained are transmitted in real time by using mobile devices and can be checked in offices through a web based GIS. Sharing the same information between patrol staffs and office workers improves promptness and certainty in decision-making. Also, the accumulated data are utilized to improve the appropriateness and the effectiveness of winter maintenance.

Takemoto A.,Japan Civil Engineering Research Institute for Cold Region | Munehiro K.,Japan Civil Engineering Research Institute for Cold Region | Takahashi N.,Japan Civil Engineering Research Institute for Cold Region | Kasai S.,Japan Civil Engineering Research Institute for Cold Region | And 2 more authors.
Transportation Research Record | Year: 2011

Most national highways in rural parts of Hokkaido, Japan, are two-way, two-lane roads. On these highways, passing maneuvers that involve the use of the oncoming lane are frequently observed. Such passing is observed even when road surfaces are covered with compacted snow. To optimize speed and safety, simulated passing maneuvers have been conducted to make use of the oncoming lane of a two-way, two-lane highway. No such traffic simulations, however, have taken into consideration the surface conditions of roads in winter (e.g., snow-covered, icy, with poor visibility caused by snowfall and fog). In this study, a traffic flow simulation to model passing maneuvers that involved the oncoming lane was created through the use of values measured in a passing-maneuver field survey conducted on a two-lane road in summer and winter. The field values for the number of passing maneuvers, traffic volume, and speed distribution were compared with the simulation results. The outcomes confirmed that the difference between them was small. The sensitivity analysis results revealed that the number of passing maneuvers on surfaces covered with compacted snow under conditions of poor visibility did not increase as much as they did on dry surfaces, even when the traffic volume in the original lane was higher. The passing success rate tended to decrease with higher volumes of traffic in the oncoming lane, regardless of surface conditions.

Amemiya K.,Shimizu and Nishie Construction Consortium for Specified Project | Kakimi K.,Shimizu Corporation | Kusumoto F.,Shimizu Corporation | Sasaki T.,Hokkaido Regional Development Bureau
ISRM International Symposium - 8th Asian Rock Mechanics Symposium, ARMS 2014 | Year: 2014

Although a spherical tunnel face has been reported to enhance the stability of tunnels where the tunnel is excavated using Sequential Excavation Method, the effect of the shape of the tunnel face on the deformation behavior, mechanical stability, and ease of construction for the tunnel has yet to be quantitatively clarified. The Shin-Takarahama Tunnel was excavated through granite by full-face advanced drill and blast while varying the shape of the spherical tunnel face and blasting pattern. As a result, full-face advanced drill and blast in combination with a spherical tunnel face enhanced tunnel stability and improved the efficiency of work in front of the tunnel face. This paper clarifies the characteristics of mechanical behavior of a tunnel with a spherical tunnel face and its ease of construction so that the effectiveness of the spherical tunnel face method is hereby quantitatively verified. © 2014 by Japanese Committee for Rock Mechanics.

Yokoyama J.,Hokkaido Regional Development Bureau | Kasai H.,Hokkaido University | Furuya A.,Hokkaido University | Yoshimizu M.,Hokkaido University
Nippon Suisan Gakkaishi (Japanese Edition) | Year: 2011

To control the hygienic conditions of fishery products from catching to landing and processing, both qualitative and quantitative bacterial observations at fishing ports must be considered. Thirty-six fishing ports in Hokkaido, northern Japan, were selected and the distributions of coli form bacteria were studied at these sites. Coli forms were observed from all fishing ports, and Escherichia coli were observed from 30 fishing ports. Especially, in relation to the number of coli form bacteria and E. coli, fishing ports which are located near a river show higher levels than any other fishing ports.

Saito H.,Hokkaido Regional Development Bureau | Date K.,Kajima Corporation | Narita N.,Kajima Corporation | Yamamoto T.,Kajima Corporation | And 2 more authors.
ISRM International Symposium - 8th Asian Rock Mechanics Symposium, ARMS 2014 | Year: 2014

The Kitanomine Tunnel (tentative name) will be a 2928m-long tunnel in Furano City, part of the Asahikawa-Tokachi Road running N-S in central Hokkaido. The area that surrounds the tunnel is rich in water resources. Thus, a 740m-long watertight structure is designed in the middle of the tunnel alignment to minimize the impact of the tunnel excavation on the groundwater environment. It is expected that the groundwater level will be recovered in the long term due to the watertight structure which does not allow the groundwater to flow into the tunnel. At the south end of the watertight structure section, pre-grouting had been conducted from the ground surface before the section was excavated. The length of the pre-grouting section was 200m. Nano-fine cement grout and chemical grout were injected into sandy soil and highly weathered welded tuff to decrease the permeability and improve the stability of the ground. In this paper, we report the quality assessment of the grouting effect conducted by resistivity tomography and in-situ permeability tests. The results of the both investigations concluded that the grout had been injected into the ground homogeneously as designed and the pre-grouting actually decreased the permeability of the original ground. Furthermore, we report the result of the excavation of the pre-grouting and non-pre-grouting sections. By observing the tunnel face continuously, it was reconfirmed that the nano-fine cement grout permeated homogeneously into sandy soil and highly weathered welded tuff as designed. In addition, the amount of water inflow was smaller than management standard value. In the non-pre-grouting section, however, the water inflow into the tunnel significantly increased, which required additional grouting from the tunnel face. © 2014 by Japanese Committee for Rock Mechanics.

Miyafuji H.,Chiyoda Corporation | Hirai Y.,Civil Engineering Research Institute CERI | Suzuki Y.,Hokkaido Regional Development Bureau
Journal of Disaster Research | Year: 2012

The Hokkaido Regional Development Bureau organized the Committee for Conservation of the River Environment in the Kushiro Wetland in 1999. The Committee summarized and released an epoch-making proposal for conservation of the river environment of the Kushiro Wetland in 2001. Governments and other organizations have since conducted measures based on the proposal for restoring and conserving the Kushiro Wetland. In 2011, river restoration in the Kayanuma area, one of the most symbolically important measures, was completed and various monitoring research is being executed. This report discusses specific effects of the project. The Kushiro Wetland has the function of a natural flood control basin and reduces the risk of damage by flooding. Work to restore and conserve the KushiroWetland thus greatly contributes to maintaining the function of flood control. This report also discusses specific contributions to flood control by the Kushiro Wetland.

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