Evaluation of the characteristics of sediment in coastal shallow sea area and development of the prediction method for maddiness environment

沿海浅海区沉积物特征评价及疯狂环境预测方法开发

• 批准号: 06556039
• 负责人: TAKAYAMA Masateru
• 金额: $ 11.71万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06556039/
• 关键词: Sediment; Turbidity; Physical and chemical properties; Mechanical properties; Resuspension; Settling; Convective Dispersion; Numerical simulation; 凝集・分散・沈降特性

Fine particles transported from rivers are deposited in an inner part of the bay, forming a vast tidal flat. The suspended materials and mud particles in estuaries bring about some environmental problems during the construction work in the sea. Establishment of the methods is needed to estimate the settlement of slurry clay and diffusion of muddiness in sea water. In the present work, some characteristics of the sediments and the transportation of the suspended mud particles have been studied.The physico-chemical and mechanical properties of the surface sediment and the distribution of benthos in a tidal flat have been investigated. The results showed that the surface sediment exhibits constant clay mineral composition throughout depth, and overconsolidated state in view of the shear strength and consolidation characteristics of the sediment. It was also indicated for Imazu estuary area that a positive correlation exists between clay and organic contents in the mud, and the weight of c … More apitata per unit area was the maximum at around-150mV redox potential. A method was proposed to determine the geotechnical parameters for the settlement of slurry clay, and the relationship of the time and the amount of consolidation was explained by the consolidation equation which took into account the friction inside of the ring.The occurrence of turbidity was formulated in terms of the relative correlation of the shear strength of mud against the yield stress of the sediment surface zone, based on the annular flume experiments and the on-site observation of tidal current velocity and the concentration of suspended mud particles in Isahaya Bay. Turbulent diffusion coefficient and settling velocity of the suspended mud particles were found, from the open channel experiments, to be dependent on the shape of power spectrum of the velocity fluctuation.Based on the results thus obtained, the code to estimate the muddiness in coastal sea has been developed and numerical simulations were conducted for Ariake Sea, and the numerical model was successfully coded. Less

从河流输送来的细颗粒物沉积在海湾内部，形成了广阔的滩涂。在海上施工过程中，河口的悬浮物和泥浆颗粒带来了一些环境问题。需要建立估算泥浆粘土沉降和泥浆在海水中扩散的方法。在目前的工作中，研究了沉积物的一些特征和悬浮泥颗粒的输送。研究了表层沉积物的物理化学和力学性质以及滩涂底栖生物的分布。结果表明，从沉积物的剪切强度和固结特性来看，表层沉积物在整个深度上表现出恒定的粘土矿物成分，并且呈现超固结状态。还表明，今津河口地区泥浆中粘土和有机物含量之间存在正相关关系，单位面积的鹦鹉重量在氧化还原电位约150mV时最大。提出了一种确定泥浆粘土沉降的岩土工程参数的方法，并通过考虑环内摩擦力的固结方程解释了固结时间与固结量的关系。 谏早湾潮流速度和悬浮泥颗粒浓度。通过明渠实验发现，悬浮泥浆颗粒的湍流扩散系数和沉降速度取决于速度脉动功率谱的形状。基于所得结果，开发了估计近海浑浊度的代码，并对有明海进行了数值模拟，并成功编写了数值模型。较少的

项目成果

近藤雅秋: "潮流による底泥の巻き上げ特性に関する研究" 農業土木学会論文集. 64巻2号. (1996)

近藤正明：“潮流污泥提升特性的研究”，日本农业土木工程学会学报，第 64 卷，第 2 期（1996 年）。

HIRAMATSU K.: "Water Quality Analysis (7) -Numerical Analysis for Convective Dispersion of Suspended Solids-" Journal of the Japanese Society of Irrigation, Drainage and Reclamation Engineering. 62. 335-341 (1994)

HIRAMATSU K.：“水质分析（7）-悬浮固体对流分散的数值分析-”日本灌溉排水和垦殖工程学会杂志。

OHTSUBO M.: "Mineralogy and chemistry, and their correlations with the geotechnical properties of marine clays in Ariake Bay, Japan-Comparison of quick and non-quick clay sediments-" Marine Georesources & Geotechnology. 14-3 (accepted for publication)21GE

OHTSUBO M.：“矿物学和化学及其与日本有明湾海洋粘土岩土特性的相关性 - 快速和非快速粘土沉积物的比较 -” 海洋地质资源

OHTSUBO M.: "Formation of iron oxide in the surface zone of marine clay sediment and the geotechnical properties of clays" Transactions of the Japanese Society of Irrigation, Drainage and Reclamation Engineering. 176. 154-158 (1995)

OHTSUBO M.：“海洋粘土沉积物表面区域氧化铁的形成和粘土的岩土特性”日本灌溉、排水和填海工程学会会刊。

KAMON M.: "Chemical properties of alluvial soils in japan" Tsuchi-to-Kiso, JGS. 43-10. 17-20 (1995)

KAMON M.：“日本冲积土的化学特性”Tschi-to-Kiso，JGS。