ELUCIDATION OF THE DEVELOPMENT AND MOVEMENT MECHANISM OF GIANT CUSP AT RIVER MOUTH

河口巨尖峰发育及运动机制解析

• 批准号: 08650589
• 负责人: MANO Akira
• 金额: $ 1.34万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08650589/
• 关键词: LONGSHORE DRIFT; SAND SPIT; RlVER FLOW; GIANT CUSP; 阿武隈川; 火焦線

In order to get better knowledge of sediment transport near river mouths, the mechanism of development and movement in a giant cusp, which often appears at the Abukuma River mouth, has been studied. River flow and longshore currents are considered as the external forces for the transport. The efflux flow field of the river and longshore current field are given by the two dimensional jet model Longuet-Higgins (1970). Along the stream line of the linearly composed velocity field of two currents continuity equation of sediments is solved. Where Meyer-Peter Muller formula is used for the transport rate.Based on the observed data of river flow and waves, seven computational cases have been performed for various wave height, wave direction and velocity of river flow. The computational results show that a narrow long cusp is formed at the weather side of the longshore current at the river mouth, especially for the height velocity of the river flow. This results agree well with the observation.

为了更好地了解河口附近的泥沙输运，对阿布库马河口经常出现的巨型尖峰的发育和运动机制进行了研究。水流和岸流被认为是搬运的外力。二维射流模型Longuet-Higgins（1970）给出了河流的射流流场和岸流场。求解了沿两流线性组成速度场的流线泥沙连续性方程。这里用Meyer-Peter Muller公式表示输运速率。根据河流和波浪的观测资料，对不同的波高、波向和流速进行了7种计算。计算结果表明，在河口沿岸水流的天气侧形成了一个狭长的尖峰，特别是河流的高度流速。这一结果与观测结果很吻合。

项目成果

Mano, Suzuki: "A dimenslonless parameter describiny sea cliff erosion" Coastal Engineering. 26(印刷中). (1998)

Mano，Suzuki：“无维参数描述海崖侵蚀”，沿海工程 26（出版中）。

福上, 真野, 沢本: "河口における大規模カスプ地形の生成機構" 海洋開発論文集. 14(印刷中). (1998)

Fukugami、Mano、Sawamoto：“河口大规模尖头地貌的生成机制”，《海洋发展杂志》14（出版中）。

佐藤芳信・真野明・沢本正樹: "阿武隈川河口の流速土砂" 海岸工学論文集. 43. 621-625 (1996)

Yoshinobu Sato、Akira Mano 和 Masaki Sawamoto：“阿武隈河口的沉积速度”《海岸工程学杂志》43. 621-625 (1996)。

SATOU,MANO AND SAWAMOT: "SEDIMENT TRANSPORT AT THE ABUKUMA RIVER MOUTH" PROC.COASTAL ENGINEERING,JSCE. 43. 621-625 (1996)

SATOU、MANO 和 SAWAMOT：“ABUKUMA 河口的沉积物输送”PROC.COASTAL ENGINEERING，JSCE。

MANO,SUGIKI AND SAWAMOTO: "OBSERVATIONS AND ANALYSES OF FINE GRAINS IN FLOOD FLOWS AT THE ABUKUMA RIVER MOUTH" JOURNAL OF GLOBAL ENVIERONMENTAL ENGINEERING. 3. 53-63 (1997)

MANO、SUGIKI 和 SAWAMOTO：“阿武隈河口洪水中细颗粒的观测和分析”全球环境工程杂志。