Low-Flow Channel Variation and Effects of Grain Sorting due to Sediment Augmentation

泥沙增加引起的低流量通道变化和谷物分选的影响

• 批准号: 19560521
• 负责人: MIWA Hiroshi
• 金额: $ 2.91万
• 依托单位: Maizuru National College of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2007
• 资助国家: 日本
• 起止时间: 2007 至 2009
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-19560521/
• 关键词: 低水路; 河床低下; 流路変動; 混合砂礫; 分級; 置き土砂; 側岸侵食; 平面二次元河床変動計算; 蛇行低水路; 置き土; 2次元河床変動計算; 側岸侵食モデル; ダム放流; 土砂侵食; 澪筋変動; 河床回復; フラッシュ

A sediment replenishment technology has been developed which involves the conveyance of part of the sediments excavated and/or dredged from reservoirs to the river below the corresponding dam. This technology has been implemented on a trial basis in several dam. However, this technique is in the development stage because there are many unknown factors. Therefore, systematic investigations are necessary in order to enable practical implementation and management of this technology. In this study, the effects of the location of replenished sediment on sediment flushing and on control of degradation are investigated by means of flume experiments and two-dimensional numerical simulations. The effects of grain size distribution (uniform and non-uniform sediments) on them are also discussed. The flushing process of replenishment sediments were investigated first, and then its effect on river bed degradation was analyzed.

已经开发了沉积物补充技术，该技术涉及将从水库挖掘和/或疏浚的部分沉积物输送到相应大坝下方的河流。该技术已在多个大坝进行试点。然而，由于存在许多未知因素，该技术仍处于开发阶段。因此，为了使这项技术能够实际实施和管理，系统的研究是必要的。本研究通过水槽实验和二维数值模拟研究了补充沉积物的位置对沉积物冲刷和降解控制的影响。还讨论了粒度分布（均匀和不均匀沉积物）对其的影响。首先研究了补给沉积物的冲刷过程，然后分析了其对河床退化的影响。

项目成果

Miwa, H.: Effect of sediment supply conditions on low-waterway formation, International Seminar for hydrological studies on carbon and nutrient, Nov. 26, 2007, University of Hyogo.

Miwa, H.：沉积物供应条件对低水道形成的影响，碳和营养水文研究国际研讨会，2007 年 11 月 26 日，兵库大学。

Low-waterway variation due to change of water and sediment supply conditions

由于水和泥沙供应条件的变化而导致的低水道变化

• 发表时间: 2008
• 作者: Hiroshi Miwa

Miwa, H.: Effects of sediment supply on low-flow channel formation, and its variation due to sediment augmentation, Environmental Hydrology and Hydraulic Engineering seminar, Invited Lecture, Apr. 16, 2010, University of Illinois.

Miwa, H.：沉积物供应对低流量河道形成的影响，及其由于沉积物增加而产生的变化，环境水文学和水利工程研讨会，特邀讲座，2010 年 4 月 16 日，伊利诺伊大学。

固定化した水みちにおける仮置き土砂の侵食・流送過程と河床低下の改善効果

固定水道临时泥沙侵蚀搬运过程及河床衰退改善效果

• 发表时间: 2009
• 作者: 竹下洋平; 三輪浩; 村上榮作; 山田達也
• 通讯作者: 山田達也

Low-waterway variation due to change of water and sediment supply conditions

由于水和泥沙供应条件的变化而导致的低水道变化

• 发表时间: 2008
• 作者: Miwa; H.; Daido; A.; Yuasa; Y.; Fujita; H.
• 通讯作者: H.