Study on recent change of gravel-bed river landscape and river forestation

砾石河道景观近期变化及河流绿化研究

基本信息

  • 批准号:
    16560443
  • 负责人:
  • 金额:
    $ 2.05万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
  • 财政年份:
    2004
  • 资助国家:
    日本
  • 起止时间:
    2004 至 2005
  • 项目状态:
    已结题

项目摘要

As recent channel characteristics of gravel-bed river, bed degradation, immobilization of the low-water course, local scour near river bank, extension of relative elevation, and overgrowth of vegetation are mentioned. Especially, the occurrence of riparian trees in the course of gravel-bed rivers has been very much increasing, which produces source of driftwoods in rivers. First in this study, recent characteristics of gravel-bed river and factors that cause the forestation of the river channel were investigated by analysis of the changes in both the channel cross-section and the woodland in the gravel segment of the River Watarase, a tributary of the River Tone. Here we focused on the excessive growth of Robinia pseudo-acacia, the representative species in river forestation.These channel characteristics in gravel-bed river are produced as results of the morphological change under the medium-size floods in the low-water course affected by alternate bars. We also discuss the low-water channel formation where recent river channel characteristics of the gravel-bed river are reflected, and the process of morphological change was examined from numerical calculation. First, a channel with alternate bar was made, afterwards, the flow discharge was lowered and the meandering low-water channel, which brings about the bank erosion and local scour, was formed. These processes were investigated from the results of present numerical calculation.Finally, a numerical simulation method has been developed for describing the behavior of driftwoods motion and their accumulation process. The present model has been composed of Eulerian analysis of fluid motion given by depth-averaged flow analysis and of Lagragian analysis of driftwoods motion by using the extended Distinct Element Method (DEM), which can simulate the motion of driftwood as the rigid body.
砾石河床的近期河道特征是河床退化、枯水河道不动、河岸局部冲刷、相对高程的扩大和植被的过度生长。特别是砾石河床河道中河岸树木的出现量大大增加,成为河道流木的来源。首先,在这项研究中,最近的砾石床河的特点和因素,导致河道造林的分析,在河道横截面和林地的变化,在河渡濑,一条支流的砾石段进行了调查。本文以河道造林的代表树种刺槐为研究对象,分析了砾石河床河道的这些特征,这些特征是在交错沙坝影响下,在中等洪水作用下,河床形态发生变化的结果。本文还讨论了反映砾石河床近期河道特征的枯水期河道形成,并通过数值计算考察了形态变化的过程。首先形成交错沙坝的河道,然后降低流量,形成弯曲的枯水河道,造成河岸冲刷和局部冲刷。最后,本文提出了一种描述漂流木运动及其堆积过程的数值模拟方法。该模型由深度平均流分析给出的欧拉流体运动分析和扩展离散元法(DEM)给出的浮木运动的拉格朗日分析组成,可以将浮木运动模拟为刚体。

项目成果

期刊论文数量(22)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Numerical study on a development process of debris flow by the entrainment of bed material in torrent sediment layer
急流沉积层床质夹带泥石流发育过程的数值研究
Study on some problems in applying the distinct element method to the analysis of sediment-mixture flows
离散元法应用于泥沙混合流分析中若干问题的研究
  • DOI:
  • 发表时间:
    2004
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Kengo OSADA;Yoshihiko SHIMIZU;Akihiko WAKAI
  • 通讯作者:
    Akihiko WAKAI
自然的攪乱・人為的インパクトと河川生態系
自然干扰、人为影响和河流生态系统
  • DOI:
  • 发表时间:
    2005
  • 期刊:
  • 影响因子:
    0
  • 作者:
    小倉紀雄編著;分担執筆清水義彦
  • 通讯作者:
    分担執筆清水義彦
渓床堆積物の侵食による土石流発達過程に関する数値解析
河床沉积物侵蚀所致泥石流发育过程的数值分析
個別要素法における粒子の回転と転がり摩擦が土石流の流動・堆積過程に及ぼす影響
离散元法研究颗粒旋转和滚动摩擦对泥石流流动和沉积过程的影响
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SHIMIZU Yoshihiko其他文献

SHIMIZU Yoshihiko的其他文献

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{{ truncateString('SHIMIZU Yoshihiko', 18)}}的其他基金

Process of Curriculum Improvement with the Lesson Analysis by Children
孩子们的课文分析改进课程的过程
  • 批准号:
    26885056
  • 财政年份:
    2014
  • 资助金额:
    $ 2.05万
  • 项目类别:
    Grant-in-Aid for Research Activity Start-up
Approach to foster students' competitiveness in global society - A teaching model for developing proficiency in English for international communication-
培养学生国际社会竞争力的方法-培养国际交流英语能力的教学模式-
  • 批准号:
    24520690
  • 财政年份:
    2012
  • 资助金额:
    $ 2.05万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Establishementof whole ovarian cryopreservation
全卵巢冷冻保存的建立
  • 批准号:
    23791831
  • 财政年份:
    2011
  • 资助金额:
    $ 2.05万
  • 项目类别:
    Grant-in-Aid for Young Scientists (B)
Study on vegetation management in forest bars caused by flood disturbance resulting from bar excavation
坝体开挖洪涝干扰林坝植被管理研究
  • 批准号:
    23560604
  • 财政年份:
    2011
  • 资助金额:
    $ 2.05万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Study on effective measures for management of bars and low water channel in forested gravel-bed rivers
森林砾石河道拦坝及低水道管理有效措施研究
  • 批准号:
    20560471
  • 财政年份:
    2008
  • 资助金额:
    $ 2.05万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Study on the destruction of riparian trees in a gravel-bed river caused by flood disturbance
洪水扰动对砾石河道河岸树木破坏的研究
  • 批准号:
    14550508
  • 财政年份:
    2002
  • 资助金额:
    $ 2.05万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
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
  • 财政年份:
    2000
  • 资助金额:
    $ 2.05万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Study on the Excessive Growth of Reverine Trees and Its Effects on Morphological Processes in Gravel-Bed River
砾石床河中Reverine树的过度生长及其对形态过程的影响研究
  • 批准号:
    10650499
  • 财政年份:
    1998
  • 资助金额:
    $ 2.05万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)

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