Development of a real-time seepage / erosion monitoring system for river embankments enables quick and appropriate measures to prevent floods at their initial stages. Flood evacuations are to be carried out more promptly, as the residents are expected to be provided with useful information.

In-situ seepage / erosion monitoring systems are running in some rivers, but they are yet to be tested by a significant flood.

Practicality and long-term stability of the system are discussed in this paper, based on a full-scale model experiment for the seepage monitoring system and an in-situ field experiment for the erosion monitoring system. The former experiment demonstrated the accuracy in detecting water levels, reliability of the measurements and the long-term stability of the system, under conditions where water levels fluctuate widely in the embankments. In the latter experiment, the erosion depth and the erosion rate during a flood were successfully measured and the practicality of the system was demonstrated.

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A debris flow along with driftwood occurred on September 10, 2015 in the Tamosawa watershed. The open type steel sabo dam named “Tamosawa Dai-ichi” protected houses against the debris flow by trapping sediments and driftwood. We investigated the amount and the structure of the sediments and driftwood captured by the dam during the excavation work at the sedimentation area. In this paper, we reported the survey method of the captured sediments and driftwood, the estimated sediment transport characteristics from the investigation, the results of blockage condition of the opening part of the dam capturing debris flow mixed with driftwood, and the volume ratio of the captured driftwood to the planned total amount of out-flow to the downstream.

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This Research is Concerning the Decrease of Heating Energy of the Super-insulated House in Cold Region. The Energy Consumption for Cooling of This House where the Heat Pump Cooling System was Use only 1.5 times Energy about Ordinary House. And the Eco-kyuto System was Able to be Work Efficiently in the Outside of Low Temperature in Summer Season.

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This paper shows a study on permeability of water vapor and odor substances through six kinds of permeable film including viscos coated paper. The water vapor permeability can be indicated as proportional to the water vapor pressure difference. In addition, gas permeable barrier characteristics to odor substances such as ammonia and toluene were examined by using calibrated electrical gas sensors. It was concluded that the viscos coated paper has better water vapor and gas barrier performance compared to the others.

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The purposes of this study are energy-saving and amenity-improvement on the heat exchange ventilation system in cold region. Trial calculation of visible and latent heat exchange efficiency requested in cold region and study on the performance of cross-flow total heat exchanger and counter-flow total heat exchanger are carried out.

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We found many houses have condensation in the crawl space in summer. These houses have enough openings on the foundation to ventilate and vapor retarder at the ground surface for the recommend in the building code. The temperature and humidity in the crawl space have great influences to durability of the house. We made clear the annual variations of hygro-thermal environment of the crawl space by the field measurements and numerical analysis. We monitored the temperature and humidity variations of 36 houses in Japan for 2 years. The numerical calculations based on the vertical one dimension heat transfer model represented the monitored results. The results show the houses in Japan normally have condensation in crawl space in summer. The condensation term is from one week to one month. The daily average of crawl space's vapor pressure is nearly equal to that of the outdoors. The difference of 2 years results is so great that we think the main factor is outdoor condition. The thermal resistance of the floor and moisture of the ground do not have great effect on the crawl space humidity.

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We examined about a state of the down draft around an air supplying register and the condensation by a central exhaust ventilation system in cold region. We made the experiment about three kinds of ventilation register, a circle type, a square type, an oblong type, an air-temperature were to change and a ventilation volume were to change. The result of the experiment was that the square register which was insulated has the most efficient.

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