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

有明浅海沿岸低地生产环境及有效利用研究

• 批准号: 11660246
• 负责人: KOUMOTO Tatsuya
• 金额: $ 2.3万
• 依托单位: Saga University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11660246/
• 关键词: Ariake shallow sea; tidal land; mud sedimentation mechanism; paddy soil; permeability; stabilized box foundation method; soft ground countermeasure; agricultural crawler vehicle; 箱型基礎工方; 沈下制御; 農用履帯型車両

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

为了阐明浅海海底沉积物的再悬浮和输运现象，采用三层时不变涡动黏度模型，对波流复合条件下的流速分布和海底剪应力进行了理论分析。发现底泥浆表层破坏和底泥浆再悬浮过程都强烈依赖于底泥浆的运动。研究了高膨润土和低膨润土在不同钠钙混合溶液下的溶胀和分散对其导水性的相对重要性和贡献。膨润土混合物的平均电导率在蒸馏水浸出过程中急剧下降，最终低于1cm/d，饱和钙的有明粘土混合物的电导率也在蒸馏水浸出过程中下降。通过对佐贺县石石镇水田的现场模型试验，发现稳定箱型基础的沉降比平板基础减少了1/2。F.E.M分析也证实了这一效应。在此基础上，对JA石石水稻育苗中心的结构进行了SBF结构设计，并验证了其减少沉降的有效性。利用橡胶履带在履带滚轮垂直载荷作用下产生的变形现象，对橡胶履带在行驶过程中的行程阻力进行了解析模拟。结果表明，该仿真方法适用于利用轨道滚轮的滚动阻力来预测行程阻力，也适用于估算各种轨道滚轮布置的滚动阻力

项目成果

M.Koriyama, M.Seguchi and O.Kato: "On the resuspension of Bottom mud in the tidal flat area under the combined wave and current flows."Trans.Jap.Soc.of Irri., Drain.and Reclam.Eng.. 209. 77-85 (2000)

M.Koriyama、M.Seguchi 和 O.Kato：“论波浪和洋流组合作用下潮滩区底部泥浆的再悬浮。”Trans.Jap.Soc.of Irri.、Drain.and Reclam.Eng。

T.Koumoto: "Stabilized Box Foundation Method for Soft Ground"Proc.of Int.Conf.on Geotechnical & Geological Engineering. Vol.2. 415-420 (2000)

T.Koumoto：“软土地基稳定箱基础法”Proc.of Int.Conf.on Geotechnical

藤巻晴行: "移流ランダムウオークモデルによる土壌中の溶質移動の解析"土壌の物理性. 81号. 43-54 (1999)

Haruyuki Fujimaki：“使用平流随机游走模型分析土壤中的溶质运动”《土壤物理学》81 No. 43-54 (1999)。

F.J.Leij, N.Toride, and P.-H.Tseng.: "Alternative approaches for modeling solute transport"Agricultural Drainage, Chapter 12, No.38 in the series of Agronomy, American Society of Agronomy. 431-465 (1999)

F.J.Leij、N.Toride 和 P.-H.Tseng.：“模拟溶质运输的替代方法”农业排水，农学系列第 12 章第 38 期，美国农学会。

藤巻 晴行: "移流ランダムウォークモデルによる土壌中の溶質移動の解析"土壌の物理性. 91. 43-54 (1999)

Haruyuki Fujimaki：“使用平流随机游走模型分析土壤中的溶质运动”《土壤物理学》，91. 43-54 (1999)。