Research on productive environment and effective use of lowland area near Ariake shallow sea

为阐明浅海区底质再悬浮和输移现象，采用三层时不变涡粘性模型，对波流联合作用下的流速分布和底质切应力进行了理论分析。结果表明，底泥表层的破坏和底泥的再悬浮过程都强烈依赖于底泥的运动，并研究了高膨胀膨润土和低膨胀有明粘土在不同Na Ca混合溶液中的膨胀和分散对渗透率的相对重要性和贡献。结果表明，膨润土混合物的平均电导率在蒸馏水淋洗过程中急剧下降，最后降至1cm/d以下，而钙饱和的有明粘土混合物的平均电导率在蒸馏水淋洗过程中也有所下降。佐贺县。这种效应也被F.E.M分析所证实。设计了SBF用于JA白石水稻育苗中心的结构施工，验证了SBF对减少沉降的有效性。利用橡胶履带在支重轮垂直载荷作用下的变形现象，对橡胶履带在行驶过程中的行驶阻力进行了解析模拟。该模拟方法可用于由支重轮的滚动阻力预测行驶阻力，并可用于估算各支重轮布置的滚动阻力

To clarify the phenomena of resuspension and transport of the bottom sediment in shallow sea area, the velocity distribution and the bottom shear stress under combined wave and current condition were analyzed theoretically by a three-layer time invariant eddy viscosity model. Both the failure of bottom mud surface layer and the process of bottom mud resuspension were found to be dependent strongly on the bottom mud movement.The relative Importance and contribution of swelling and dispersion to the hydraulic conductivity of high swelling bentonite and low swelling Ariake clay under various Na-Ca mixed solutions were investigated. The average conductivity for the bentonite mixture was found to decrease drastically and finally become less than 1cm/day and that for the Ca-saturated Ariake clay mixture being also found to decrease during the distilled water leaching.The stabilized box foundation (SBF) method was found to decrease the settlement by 1/2 of that of the slab foundation from the in-situ model tests on the paddy field in Shiroishi town, Saga Prefecture. This effect was also made sure by the F.E.M analysis. Then the SBF was designed to construct for the structure of the JA Shiroishi Rice Seedling Center and confirmed the effectiveness to decrease the settlement.The travel resistance of the rubber crawler during driving was analytically simulated by using the deformation phenomenon of the rubber crawler due to the vertical load of the track rollers. This simulation method was found to be applicable to predict travel resistance by the rolling resistance of the track roller and to estimate the rolling resistance for each track roller arrangement