Study on the mechanism of the riparian trees expansion in a gravel-bed river and an approach to that management

砾石河道河岸树木扩张机理及治理方法研究

• 批准号: 12650505
• 负责人: SHIMIZU Yoshihiko
• 金额: $ 2.3万
• 依托单位: Gunma University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650505/
• 关键词: Riparian trees; Gravel bed-river; Robinia pseudo-acacia; 2D-flow model; Critical tractive force; Instream vegetation; 一般化座標系平面流数値計算; 動的樹林化; 一般化座標系平面流数値計; 樹林化; 一般化座標系平面流解析; 高水敷侵食; 掃流力

Recently riparian trees in the course of gravel bed-river have extremely increased and enlarged their covered-area over bars and flood plain. Such a situation brings about problems of river management for the environmental aspects as well as the safety of rivers against flood. In order to clarify such problems, we should get the knowledge about how the instream vegetation grow up and expand their covered zones in the gravel-bed river. In this study, the cause of the excessive growth of Robinia pseudo-acacia was examined in the segment-1 reach of Watarase River. Especially, from the investigation of the annual rings of tree, it was clear that some forests of Robinia pseudo-acacia in bars were formed right after of the main flood. We show that the floods cause change of generation of the trees and rapidly expansion by the germination from fallen trees makes the excessive growth of riverine trees. Based on the field study and numerical analysis with 2D- flow model, the critical tractive force to be an index of the scale of flood disturbance is evaluated and results show that the damage scale of the riparian trees depends on the size of the critical tractive force and bed-degradation.

最近，在砾石床上的河岸树上已经极大地增加，并在酒吧和洪水平原上扩大了覆盖区。这种情况给环境方面的河流管理问题带来了问题，以及河流的安全侵害洪水。为了澄清此类问题，我们应该了解有关乐器植被如何长大并扩大其在砾石床的覆盖区域的知识。在这项研究中，在Watarase River的Segment-1触及河段中检查了Robinia pseudo-Acacia过度生长的原因。特别是，从对树的年度环调查中，很明显，在主要洪水之后形成了酒吧中的一些罗比尼亚伪阿西亚森林。我们表明，洪水会导致树木产生的变化，并因倒下的树木发芽而迅速扩张，这使河流过多生长。基于现场研究和2D流模型的数值分析，评估了作为洪水干扰尺度指数的临界拖流力，结果表明河岸树的损伤尺度取决于关键的拖流力和床降解的大小。

项目成果

清水義彦: "河道内樹林化と流れ・移動床過程について"日本学術会議メカニクス・構造研究連絡委員会,第50回理論応用力学講演会講演論文集. 50巻. 53-54 (2001)

Yoshihiko Shimizu：“论河道造林和流动/移动床过程”第 50 届理论与应用力学会议论文集，力学与结构联络委员会，日本科学理事会第 50 卷 53-54（2001 年）。

Yoshihiko SHIMIZU, Shigeki KOBATAKE, Satoshi OKADA, Takayuki ARAFUNE, Takumi IWASAKI: "Study on the expansion of riverine trees in gravel-bed river caused by flood disturbance"Advances in River Engineering, JSCE. Vol. 6. 59-64 (2000)

Yoshihiko SHIMIZU、Shigeki KOBATAKE、Satoshi OKADA、Takayuki ARAFUNE、Takumi IWASAKI：“洪水干扰引起的砾石河道中河道树木扩张的研究”河流工程进展，JSCE。

Yoshihiko SHIMIZU: "The study on the riverine trees expansion caused by the flood disturbance"The 50^<th> Nat. Cong. of Theoretical and Applied Mechanics. 53-54 (2001)

清水义彦：“洪水扰动引起的河道树木扩张的研究”第50届Nat.

清水義彦, 小葉竹重機, 新船隆行: "樹林化河道の洪水流況と浮遊砂輸送に関する数値計算"土木学会水工学論文集. 44巻. 819-824 (2000)

Yoshihiko Shimizu、Kobatake Juki、Takayuki Shinfune：“森林河道洪水流条件和悬浮泥沙输送的数值计算”日本土木工程学会水利工程学报，第 44 卷，819-824（2000 年）。

Yoshihiko SHIMIZU, Shigeki KOBATAKE, Satoshi OKADA: "Study on the expansion of robinia pseudo-acacia in gravel-bed river caused by flood disturbance"Annual Journal of Hydraulic Engineering, JSCE. Vol. 45. 1099-1104 (2001)

清水义彦、小畑茂树、冈田聪：“洪水扰动引起的碎石床河中刺槐扩张的研究”，日本水利工程学报，水利工程学报。