Effects of water discharge and sediment supply on deformation of riverbed with sand bars

泄水供沙对沙坝河床变形的影响

• 批准号: 12650522
• 负责人: MIWA Hiroshi
• 金额: $ 2.3万
• 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: 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-12650522/
• 关键词: deformation of riverbed; alternate bars; meandering streams; change of water discharge; wavelength and height; emerged bars; non-uniform sediment; grain sorting; 淵; 波長; 波高; 給砂条件; 蛇行波長

Effects of water discharge and sediment supply on deformation of sandbar beds are investigated. The effect of grain sorting on the bad deformation is also investigated. The summary of results is as follows :1. Effects of change in water discharge on growth and transformation of alternate bars(1) Effect of change rate on the transformation is relatively small in case of a long wave period, whereas it is large in case of a short one.(2) Wave height of an individual alternate bar in the non-uniform sediment bed is lower than that in the uniform one during the flood period.(3) Response-lag of the wavelength and height, flow depth and sediment transport rate to discharge change are small when the wave period is long, whereas they are large when the wave period is short. And, response-lag of alternate bars to discharge change in the non-uniform sediment bed is smaller than that in the uniform one.2. Effects of sediment supply on alternate bar transformation and meandering stream formation(1) The centralization of flow at pools of alternate bars due to decrease of water discharge makes emerged bars appear, and forms meandering streams. The meandering streams in case with sediment supply are shallow and vary actively, whereas those in case without sediment supply are deep and stable.(2) The emerged bars in the non-uniform sediment bed are formed with grain sorting, and are more stable than those in the uniform one.3. Effects of water discharge on meandering stream deformation and alternate bar reformation(1) Alternate bars are formed easily in the non-uniform sediment bed because the emerged bars in that bed are eroded easily than those in the uniform one.(2) The meandering streams are transformed into more large alternate bars by the riverbed aggradation and the low water discharge.

研究了排水和输沙对沙洲床变形的影响。还研究了晶粒分选对不良变形的影响。结果总结如下： 1．流量变化对交替坝生长和转变的影响 (1) 波周期长时变化率对转变的影响较小, 波周期短时变化率影响较大。 (2) 波高洪水期,非均匀泥沙床中单个交错坝的相对流量小于均匀泥沙床。 (3)当洪水期时,波长和高度、水流深度和输沙速率对流量变化的响应滞后较小。波周期长时，波周期大时，它们就大 短的。并且，非均匀沉积床中交替坝对流量变化的响应滞后小于均匀沉积床中的响应滞后。2．输沙对互生坝改造及曲流河形成的影响 (1)由于流量减少，互生坝池内水流集中，使坝体出现，形成曲流。有泥沙供给的情况下曲流河道浅且变化剧烈，无泥沙供给情况下的曲流河道深且稳定。(2)非均匀沉积床中出现的坝体是经过颗粒分选而形成的，较稳定。那些穿着制服的人 one.3。泄水对曲流河变形及交错坝改造的影响(1)非均匀沉积层中较易形成交错坝,因为该层中出现的坝比均匀沉积物更容易被侵蚀。(2)曲流河道由于河床淤积和流量减少，这些沙坝变成了更大的交替坝。

项目成果

Miwa, H.: "Effects of sediment supply on deformation of alternate bars and development of meandering streams (in Japanese)"Proceedings of Annual Conference of Civil Engineering 2001, JSCE Kansai Chapter. II-34 (2001)

Miwa, H.：“沉积物供应对交替坝变形和曲流溪流发展的影响（日语）”2001 年土木工程年会论文集，JSCE 关西分会。

Miwa, H.: "Development and transformation on alternate bars due to change of water discharege (in Japanese)"Bulletin of Maizuru National College of Technology. Vol.37. 95-106 (2002)

Miwa, H.：“由于排水量变化引起的交替坝的开发和改造（日语）”舞鹤国立工业大学通报。

Miwa H.: "Alternate bar transformation due to change of water discharge in graded and uniform sediment beds"Proceedings of the 5th International Conference of Hydro-Science and -Engineering. Vol.5/CD-ROM. (2002)

Miwa H.：“由于分级和均匀沉积层中水流量的变化而引起的交替坝变换”第五届国际水利科学与工程会议论文集。

Miwa, H.: "Alternate bar development and flow resistance under unsteady flow conditions (in Japanese)"Proceedigs of Annual Conference of Civil Engineers 2000, JSCE Kansai Chapter. II-38 (2000)

Miwa, H.：“非定常流动条件下的交替杆发展和流动阻力（日语）”2000 年土木工程师年会论文集，JSCE 关西分会。

Miwa, H.: "Effects of water discharge on deformation of meandering streams and development of alternate bars(in Japanese)"Proceedings of the 57th Annual Conference of JSCE Kansai Chapter. II-30 (2002)

Miwa, H.：“排水对曲流溪流变形和交替坝发育的影响（日语）”JSCE 关西分会第 57 届年会论文集。