Nagaoka city area in an alluvial fan is dangerous in flood control, because the Shinano River flows fast, meanders and attacks the area. Safety of levees is a serious problem. After the alignment of low water channel was examined in a hydraulic model experiment as well as a training levee, a low water revetment has been executed the work since 1975. About 25 years have passed, the site observation results were compared with the hydraulic model experiment results about changes of a riverbed and reduction of flow attacking effect. The effect of training levee, which is main concern of this planning, is evaluated by numerical simulation.
This study is conducted as part of the study on estimation of the peak discharge of "the Yokota-Gire Flood" in July 1896, one of the historical floods in the Shinano River Basin. This study analyses relationship between rainfalls and discharges of relatively large floods since 1956 with well recorded rainfalls and flood discharges, and particularly compares the Yokota-Gire Flood with the flood in September 1982, in which the similar amount of rainfall was recorded despite the difference of the number of precipitation stations exists. Making clear the characteristics of hourly and spatial distribution of the rainfalls which caused large floods in the Shinano River Basin, not only helped to improve the accuracy of the peak discharge estimation of the Yokota-Gire Flood and to verify its validity, but also clarified the statistical positioning of the Yokota-Gire Flood through rainfall characteristics. Key Word: historic flood, rainfall and discharge, hourly and spatial distribution of rainfall, estimation of peak discharge
In any rapid rivers, maintaining the major bed width is considered to be one of the most important river works. In Kurobe Rivcr, a riverbank erosion prevention method has been conducted based on hydraulic model experiment, and the interval and the length of the longitudinal facility was examined. The construction has been made since 1992. For the bank erosion by medium size floods of July 1995, and June 1996, the field investigation was performed on the response of the longitudinal facility to the floods, and it was compared with the model experiment.
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