1 正会員 農博 農村工学研究所 施設資源部水源施設水理研究室 (〒305-8609 つくば市観音台2-1-6)In the Ashigaike Regulating Reservoir, not the runoff from the watershed but the conveyed water from the outside of watershed is stored for the improvement of the water quality and the strengthening of the irrigation water supply ability. In this reserch, the method not only to decrease TN load but also to preserve the effect of dilution by water conveyance was considered by simulation using distributed water quality tank model. As a results, it was clarified that the following methods are suitable; 1)Water conveyance would not be executed until the storing rate of the reservoir decreases an appropriate value.2)The runoff water from the watershed would be stored. 3)Reuse irrigation would be executed. 4)The water which equals the volume saved by reuse irrigation is conveyed and released during non-irrigation period.
This paper introduces basic research conducted to develop a numerical analysis technique for water hammer analysis. The CIP (Cubic Interpolated Profile) scheme was applied to obtain more accurate results without greatly causing a spatial interpolation error depending on the Courant number in the method of characteristics. Regarding this technique, the authors derived a well-formed error formula by applying a linear stability analysis. Characteristics of the interpolation error were clarified by comparing existing interpolation schemes with the method of characteristics. The interpolation error of CIP scheme was superior to the Spatial Linear Interpolation Scheme, was approximately equal to the Time Linear Interpolation Scheme and the cubic spline interpolation scheme with sufficient number of computational grids. The calculation efficiency of the CIP scheme was superior to the other schemes excepting the Spatial Linear Interpolation Scheme.
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